3
3.0
Jun 29, 2018
06/18
by
Christine Nattrass; Natasha Sharma; Joel Mazer; Meghan Stuart; Aram Bejnood
texts
eye 3
favorite 0
comment 0
We present an analysis of di-hadron correlations using recently developed methods for background subtraction which allow for higher precision measurements with fewer assumptions about the background. These studies indicate that low momentum jets interacting with the medium do not equilibrate with the medium, but rather that interactions with the medium lead to more subtle increases in their widths and fragmentation functions, consistent with observations from studies of higher momentum fully...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1606.00677
3
3.0
Jun 29, 2018
06/18
by
NA49 Collaboration; T. Anticic; B. Baatar; J. Bartke; H. Beck; L. Betev; H. Białkowska; C. Blume; B. Boimska; J. Book; M. Botje; P. Bunčić; P. Christakoglou; P. Chung; O. Chvala; J. G. Cramer; V. Eckardt; Z. Fodor; P. Foka; V. Friese; M. Gaździcki; K. Grebieszkow; C. Höhne; K. Kadija; A. Karev; V. I. Kolesnikov; M. Kowalski; D. Kresan; A. Laszlo; R. Lacey; M. van Leeuwen; M. Maćkowiak-Pawłowska; M. Makariev; A. I. Malakhov; G. L. Melkumov; M. Mitrovski; St. Mrówczyński; G. Pálla; A....
texts
eye 3
favorite 0
comment 0
Production of $d$, $t$, and $^3$He nuclei in central Pb+Pb interactions was studied at five collision energies ($\sqrt{s_{NN}}=$ 6.3, 7.6, 8.8, 12.3, and 17.3 GeV) with the NA49 detector at the CERN SPS. Transverse momentum spectra, rapidity distributions, and particle ratios were measured. Yields are compared to predictions of statistical models. Phase-space distributions of light nuclei are discussed and compared to those of protons in the context of a coalescence approach. The coalescence...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1606.04234
3
3.0
Jun 29, 2018
06/18
by
Biswarup Paul
texts
eye 3
favorite 0
comment 0
The production of charmonium states, J/$\psi$ and $\psi$(2S), in heavy-ion collisions, is an important probe to investigate the formation of a plasma of quarks and gluons (QGP). In a hot and deconfined medium, quarkonium production is, indeed, expected to be significantly modified, with respect to the pp yields, due to a balance of color screening and charm-quark recombination mechanisms. The ALICE Collaboration at the LHC has measured charmonium production in Pb-Pb collisions at $\sqrt{s}_{\rm...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1609.06889
4
4.0
Jun 29, 2018
06/18
by
K. L. Laursen; H. O. U. Fynbo; O. S. Kirsebom; K. S. Madsøll; K. Riisager
texts
eye 4
favorite 0
comment 0
The reaction $^{11}\textrm{B}+p$ has been used to populate the $(J^\pi,T) = (2^+,1)$ state at an excitation energy of 16.11 MeV in $^{12}$C. $\gamma$-decay to unbound states in $^{12}$C are identified from analysis of the decay of the populated daughter states. Due to a new technique, $\gamma$-decay to the 10.8 MeV 1$^-$ state is observed for the first time, and transitions to the 9.64 MeV (3$^-$) and 12.71 MeV (1$^+$) are confirmed. Unresolved transitions to natural parity strength at 10 MeV...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1610.00509
9
9.0
Jun 29, 2018
06/18
by
NA61/SHINE Collaboration; :; A. Aduszkiewicz; Y. Ali; E. Andronov; T. Anticic; N. Antoniou; B. Baatar; F. Bay; A. Blondel; M. Bogomilov; J. Puzovic; R. Rameika; W. Rauch; M. Ravonel; A. Redij; R. Renfordt; E. Richter-Was; A. Robert; D. Rohrich; E. Rondio; A. Brandin; M. Roth; A. Rubbia; B. T. Rumberger; A. Rustamov; M. Rybczynski; A. Rybicki; A. Sadovsky; K. Sakashita; R. Sarnecki; K. Schmidt; A. Bravar; T. Sekiguchi; I. Selyuzhenkov; A. Seryakov; P. Seyboth; D. Sgalaberna; M. Shibata; M....
texts
eye 9
favorite 0
comment 0
Results on two-particle $\Delta\eta\Delta\phi$ correlations in inelastic p+p interactions at 20, 31, 40, 80, and 158~GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the EPOS and UrQMD models.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1610.00482
15
15
Jun 27, 2018
06/18
by
Z. Kohley; T. Baumann; G. Christian; P. A. DeYoung; J. E. Finck; N. Frank; B. Luther; E. Lunderberg; M. Jones; S. Mosby; J. K. Smith; A. Spyrou; M. Thoennessen
texts
eye 15
favorite 0
comment 0
Background: Theoretical calculations have shown that the energy and angular correlations in the three-body decay of the two-neutron unbound O26 can provide information on the ground-state wave function, which has been predicted to have a dineutron configuration and 2n halo structure. Purpose: To use the experimentally measured three-body correlations to gain insight into the properties of O26, including the decay mechanism and ground-state resonance energy. Method: O26 was produced in a...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1503.06191
13
13
Jun 30, 2018
06/18
by
STAR Collaboration; L. Adamczyk; J. K. Adkins; G. Agakishiev; M. M. Aggarwal; Z. Ahammed; I. Alekseev; J. Alford; C. D. Anson; A. Aparin; D. Arkhipkin; W. Guryn; B. Haag; A. Hamed; L-X. Han; R. Haque; J. W. Harris; S. Heppelmann; A. Hirsch; G. W. Hoffmann; D. J. Hofman; E. C. Aschenauer; S. Horvat; B. Huang; H. Z. Huang; X. Huang; P. Huck; T. J. Humanic; G. Igo; W. W. Jacobs; H. Jang; E. G. Judd; G. S. Averichev; S. Kabana; D. Kalinkin; K. Kang; K. Kauder; H. W. Ke; D. Keane; A. Kechechyan; A....
texts
eye 13
favorite 0
comment 0
We present results of analyses of two-pion interferometry in Au+Au collisions at $\sqrt{s_{NN}}$ = 7.7, 11.5, 19.6, 27, 39, 62.4 and 200 GeV measured in the STAR detector as part of the RHIC Beam Energy Scan program. The extracted correlation lengths (HBT radii) are studied as a function of beam energy, azimuthal angle relative to the reaction plane, centrality, and transverse mass ($m_{T}$) of the particles. The azimuthal analysis allows extraction of the eccentricity of the entire fireball at...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1403.4972
11
11
Jun 26, 2018
06/18
by
ALICE Collaboration
texts
eye 11
favorite 0
comment 0
We report the results of the femtoscopic analysis of pairs of identical pions measured in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV. Femtoscopic radii are determined as a function of event multiplicity and pair momentum in three spatial dimensions. As in the pp collision system, the analysis is complicated by the presence of sizable background correlation structures in addition to the femtoscopic signal. The radii increase with event multiplicity and decrease with pair transverse...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1502.00559
15
15
Jun 27, 2018
06/18
by
M. J. Tannenbaum
texts
eye 15
favorite 0
comment 0
The many different theoretical studies of energy loss of a quark or gluon traversing a medium have one thing in common: the transport coefficient of a gluon in the medium, $\hat{q}$, which is defined as the mean 4-momentum transfer$^2$, $\left $, by a gluon to the medium per gluon mean free path, $\lambda_{\rm mfp}$. In the original BDMPSZ formalism, the energy loss of an outgoing parton, $-dE/dx$, per unit length ($x$) of a medium with total length $L$, due to coherent gluon bremsstrahlung, is...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1504.03657
4
4.0
Jun 30, 2018
06/18
by
B. Krusche; C. Wilkin
texts
eye 4
favorite 0
comment 0
The production of $\eta$ and $\eta^{\prime}$ mesons in photon- and hadron-induced reactions on free and quasi-free nucleons and on nuclei is reviewed. The extensive database on $\gamma N \to \eta N$, for both proton and neutron targets, is described in detail and its implications for the search for $N^{\star}$ resonances much heavier than the dominant $S_{11}(1535)$ discussed. Though less is currently known about the production of the $\eta^{\prime}$ or of $\eta\pi$ pairs, these also offer...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1410.7680
6
6.0
Jun 30, 2018
06/18
by
Sang Eon Park on behalf of the CMS Collaboration
texts
eye 6
favorite 0
comment 0
In nucleus-nucleus collisions, the linear dependence found for the elliptic flow harmonic of both positive or negative charged particles as a function of event charge asymmetry is predicted by the phenomenon known as the Chiral Magnetic Wave (CMW) due to its induced electric quadrupole moment. Here, the event charge asymmetry $A_{\rm ch}$ is defined as $\frac{N_{+}-N_{-}}{N_{+}+N_{-}}$, where $N_{+}$ and $N_{-}$ are the number of positive and negative charged particles, respectively. However,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1704.06712
6
6.0
Jun 30, 2018
06/18
by
Hans Georg Ritter; Reinhard Stock
texts
eye 6
favorite 0
comment 0
We present a historical review of the physics observables developed for relativistic nuclear collisions, that describe collective hydrodynamic flow of hadronic or partonic matter, and of the corresponding experimental progress. We begin with the early discovery phase of radial and directed flow at the Bevalac, and continue the review until the recent work at RHIC and LHC, and related theory.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1408.4296
8
8.0
Jun 30, 2018
06/18
by
ALICE Collaboration
texts
eye 8
favorite 0
comment 0
The elliptic flow coefficient ($v_{2}$) of identified particles in Pb-Pb collisions at $\sqrt{s_\mathrm{{NN}}} = 2.76$ TeV was measured with the ALICE detector at the LHC. The results were obtained with the Scalar Product method, a two-particle correlation technique, using a pseudo-rapidity gap of $|\Delta\eta| > 0.9$ between the identified hadron under study and the reference particles. The $v_2$ is reported for $\pi^{\pm}$, $\mathrm{K}^{\pm}$, $\mathrm{K}^0_\mathrm{S}$,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1405.4632
6
6.0
Jun 30, 2018
06/18
by
WASA-at-COSY Collaboration; :; P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F. S. Bergmann; M. Berłowski; H. Bhatt; A. Bondar; M. Büscher; J. Zabierowski; M. J. Zieliński; A. Zink; J. Złomańczuk; P. Żuprański; M. Żurek; H. Calén; I. Ciepał; H. Clement; D. Coderre; E. Czerwiński; K. Demmich; E. Doroshkevich; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C. -O. Gullström; C. Hanhart; F....
texts
eye 6
favorite 0
comment 0
Charge symmetry breaking (CSB) observables are a suitable experimental tool to examine effects induced by quark masses on the nuclear level. Previous high precision data from TRIUMF and IUCF are currently used to develop a consistent description of CSB within the framework of chiral perturbation theory. In this work the experimental studies on the reaction dd->4He{\pi}0 have been extended towards higher excess energies in order to provide information on the contribution of p-waves in the...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1407.2756
5
5.0
Jun 29, 2018
06/18
by
P. Cirkovic; D. Devetak; M. Dordevic; J. Milosevic; M. Stojanovic
texts
eye 5
favorite 0
comment 0
Recent LHC results on the appearance of sub-leading flow modes in PbPb collisions at 2.76~TeV, related to initial-state fluctuations, are analyzed and interpreted within the HYDJET++ model. Using the newly introduced Principal Component Analysis (PCA) method applied to two-particle azimuthal correlations extracted from the model calculations, the leading and the sub-leading flow modes are studied as a function of the transverse momentum ($p_{T}$) over a wide centrality range. The leading modes...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1611.06602
5
5.0
Jun 30, 2018
06/18
by
D. Caffarri for the ALICE Collaboration
texts
eye 5
favorite 0
comment 0
The characterization of the jet substructure can give insight into the microscopic nature of the modification induced on high-momentum partons by the Quark-Gluon Plasma that is formed in ultra-relativistic heavy-ion collisions. Jet shapes allow us to study the modification of parton to jet fragmentation and virtuality, probing jet energy redistribution, intra-jet broadening or collimation and possible flavour hierarchy. Results of a selected set of jet shapes will be presented for...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1704.05230
7
7.0
Jun 30, 2018
06/18
by
Kathryn Meehan; for the STAR Collaboration
texts
eye 7
favorite 0
comment 0
We present results from STAR's first dedicated fixed-target run conducted in 2015 with Au + Au collisions at sqrt(s_NN) = 4.5 GeV. Directed flow of protons and lambdas, elliptic flow of identified hadrons, HBT radii, as well as pion, K^0_s, and Lambda spectra are compared with previous results from the AGS. These results demonstrate that STAR has good event reconstruction and particle identification capabilities in the fixed-target configuration. The implications of these results on future STAR...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1704.06342
5
5.0
Jun 28, 2018
06/18
by
Elena Kokoulina; E. Ardashev; V. Golovkin; S. Golovnya; S. Gorokhov; A. Kholodenko; A. Kiryakov; I. Lobanov; M. Polkovnikov; V. Ronzhin; V. Ryadovikov; Yu. Tsyupa; A. Vorobiev; V. Avdeichikov; V. Balandin; V. Dunin; O. Gavrishchuk; A. Isupov; N. Kuzmin; V. Nikitin; Yu. Petukhov; S. Reznikov; V. Rogov; I. Rufanov; N. Zhidkov; L. Zolin; G. Bogdanova; V. Popov; V. Volkov; A. Kutov; A. Kazakov; G. Pokatashkin; R. Salyanko
texts
eye 5
favorite 0
comment 0
First results of a soft photon yield in nucleus-nuclear interactions at 3.5 GeV per nucleon are presented. These photons have been registered at Nuclotron (LHEP, JINR) by an electromagnetic calorimeter built in the SVD Collaboration. The obtained spectra confirm the excess yield in the energy region less than 50 MeV in comparison with theoretical predictions and agree with previous experiments at high-energy interactions.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1510.00517
11
11
Jun 29, 2018
06/18
by
STAR Collaboration; L. Adamczyk; J. K. Adkins; G. Agakishiev; M. M. Aggarwal; Z. Ahammed; I. Alekseev; A. Aparin; D. Arkhipkin; E. C. Aschenauer; A. Attri; T. J. Humanic; G. Igo; W. W. Jacobs; H. Jang; A. Jentsch; J. Jia; K. Jiang; E. G. Judd; S. Kabana; D. Kalinkin; G. S. Averichev; K. Kang; K. Kauder; H. W. Ke; D. Keane; A. Kechechyan; Z. H. Khan; D. P. Kikoła; I. Kisel; A. Kisiel; L. Kochenda; X. Bai; D. D. Koetke; L. K. Kosarzewski; A. F. Kraishan; P. Kravtsov; K. Krueger; L. Kumar; M. A....
texts
eye 11
favorite 0
comment 0
We present results from a harmonic decomposition of two-particle azimuthal correlations measured with the STAR detector in Au+Au collisions for energies ranging from $\sqrt{s_{NN}}=7.7$ GeV to 200 GeV. The third harmonic $v_3^2\{2\}=\langle \cos3(\phi_1-\phi_2)\rangle$, where $\phi_1-\phi_2$ is the angular difference in azimuth, is studied as a function of the pseudorapidity difference between particle pairs $\Delta\eta = \eta_1-\eta_2$. Non-zero {\vthree} is directly related to the previously...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1601.01999
13
13
Jun 26, 2018
06/18
by
Takafumi Niida
texts
eye 13
favorite 0
comment 0
Azimuthal angle dependence of the pion source radii was measured applying the event shape selection at the PHENIX experiment. The measured final source eccentricity is found to be enhanced when selecting events with higher magnitude of the second-order flow vector, as well as the elliptic flow coefficient $v_{2}$. The spatial twist of the particle-emitting source was also explored using a transport model. Results indicate a possible twisted source in the final state due to the initial...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1501.06782
19
19
Jun 28, 2018
06/18
by
A. Hennig; V. Derya; M. N. Mineva; P. Petkov; S. G. Pickstone; M. Spieker; A. Zilges
texts
eye 19
favorite 0
comment 0
In this article a method for lifetime measurements in the sub-picosecond regime via the Doppler-shift attenuation method (DSAM) following the inelastic proton scattering reaction is presented. In a pioneering experiment we extracted the lifetimes of 30 excited low-spin states of $^{96}$Ru, taking advantage of the coincident detection of scattered protons and de-exciting $\gamma$-rays as well as the large number of particle and $\gamma$-ray detectors provided by the SONIC@HORUS setup at the...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1506.05986
4
4.0
Jun 29, 2018
06/18
by
Davide Caffarri
texts
eye 4
favorite 0
comment 0
Open heavy-flavour and quarkonia measurements are important tools to study the hot and dense partonic medium formed in ultra-relativistic heavy-ion collisions. The modification of their production in those collisions, with respect to the pp and p-Pb ones, can help in the characterization of this medium. Quarkonia and open heavy-flavour production is measured in ALICE in the three different collision systems, at mid- and forward rapidity. A selection of those results recently obtained in Pb-Pb...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1606.03970
3
3.0
Jun 29, 2018
06/18
by
Johan Messchendorp; on behalf of the PANDA Collaboration
texts
eye 3
favorite 0
comment 0
The non-perturbative nature of the strong interaction leads to spectacular phenomena, such as the formation of hadronic matter, color confinement, and the generation of the mass of visible matter. To get deeper insight into the underlying mechanisms remains one of the most challenging tasks within the field of subatomic physics. The antiProton ANnihilations at DArmstadt (PANDA) collaboration has the ambition to address key questions in this field by exploiting a cooled beam of antiprotons at...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1610.02804
6
6.0
Jun 30, 2018
06/18
by
L. S. Myers; K. Shoniyozov; M. F. Preston; M. D. Anderson; J. R. M. Annand; M. Boselli; W. J. Briscoe; J. Brudvik; J. I. Capone; G. Feldman; K. G. Fissum; K. Hansen; S. S. Henshaw; L. Isaksson; R. Jebali; M. A. Kovash; K. Lewis; M. Lundin; I. J. D. MacGregor; D. G. Middleton; D. E. Mittelberger; M. Murray; A. M. Nathan; S. Nutbeam; G. V. O'Rielly; B. Schröder; B. Seitz; S. C. Stave; H. R. Weller
texts
eye 6
favorite 0
comment 0
Elastic scattering of photons from 12C has been investigated using quasi-monoenergetic tagged photons with energies in the range 65 - 115 MeV at laboratory angles of 60 deg, 120 deg, and 150 deg at the Tagged-Photon Facility at the MAX IV Laboratory in Lund, Sweden. A phenomenological model was employed to provide an estimate of the sensitivity of the 12C(g,g)12C cross section to the bound-nucleon polarizabilities.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1401.4028
7
7.0
Jun 30, 2018
06/18
by
P. Adlarson; W. Augustyniak; W. Bardan; M. Bashkanov; F. S. Bergmann; M. Berłowski; H. Bhatt; M. Büscher; H. Calén; I. Ciepał; H. Clement; L. Yurev; J. Zabierowski; M. J. Zieliński; A. Zink; J. Złomańczuk; P. Żuprański; M. Żurek; D. Coderre; E. Czerwiński; K. Demmich; E. Doroshkevich; R. Engels; A. Erven; W. Erven; W. Eyrich; P. Fedorets; K. Föhl; K. Fransson; F. Goldenbaum; P. Goslawski; A. Goswami; K. Grigoryev; C. -O. Gullström; F. Hauenstein; L. Heijkenskjöld; V. Hejny; M....
texts
eye 7
favorite 0
comment 0
We present new data for angular distributions and on the cross section ratio of the p + d -> 3He + eta reaction at excess energies of Q = 48.8 MeV and Q = 59.8 MeV. The data have been obtained at the WASA-at-COSY experiment (Forschungszentrum J\"ulich) using a proton beam and a deuterium pellet target. While the shape of obtained angular distributions show only a slow variation with the energy, the new results indicate a distinct and unexpected total cross section fluctuation between Q...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1402.3469
5
5.0
Jun 30, 2018
06/18
by
E. Henry; J. Toke; S. Nyibule; M. Quinlan; W. U. Schroder; G. Ademard; F. Amorini; L. Auditore; C. Beck; I. Berceanu; E. Bonnet; B. Borderie; G. Cardella; A. Chbihi; M. Colonna; E. De Filippo; A. DOnofrio; J. D. Frankland; E. Geraci; E. La Guidara; M. La Commara; G. Lanzalone; P. Lautesse; D. Lebhertz; N. Le Neindre; I. Lombardo; D. Loria; K. Mazurek; A. Pagano; M. Papa; E. Piasecki; S. Pirrone; G. Politi; F. Porto; F. Rizzo; E. Rosato; P. Rusotto; G. Spadaccini; A. Trifiro; M. Trimarchi; G....
texts
eye 5
favorite 0
comment 0
An analysis of experimental data from the inverse-kinematics ISODEC experiment on 78Kr+40Ca reaction at a bombarding energy of 10 AMeV has revealed signatures of a hitherto unknown reaction mechanism, intermediate between the classical damped binary collisions and fusion-fission, but also substantially different from what is being termed in the literature as fast fission or quasi fission. These signatures point to a scenario where the system fuses transiently while virtually equilibrating mass...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1404.3758
5
5.0
Jun 30, 2018
06/18
by
G. M. Huber; H. P. Blok; C. Butuceanu; D. Gaskell; T. Horn; D. J. Mack; D. Abbott; K. Aniol; H. Anklin; C. Armstrong; J. Arrington; K. Assamagan; S. Avery; O. K. Baker; B. Barrett; E. J. Beise; C. Bochna; W. Boeglin; E. J. Brash; H. Breuer; C. C. Chang; N. Chant; M. E. Christy; J. Dunne; T. Eden; R. Ent; H. Fenker; E. F. Gibson; R. Gilman; K. Gustafsson; W. Hinton; R. J. Holt; H. Jackson; S. Jin; M. K. Jones; C. E. Keppel; P. H. Kim; W. Kim; P. M. King; A. Klein; D. Koltenuk; V. Kovaltchouk; M....
texts
eye 5
favorite 0
comment 0
The study of exclusive $\pi^{\pm}$ electroproduction on the nucleon, including separation of the various structure functions, is of interest for a number of reasons. The ratio $R_L=\sigma_L^{\pi^-}/\sigma_L^{\pi^+}$ is sensitive to isoscalar contamination to the dominant isovector pion exchange amplitude, which is the basis for the determination of the charged pion form factor from electroproduction data. A change in the value of $R_T=\sigma_T^{\pi^-}/\sigma_T^{\pi^+}$ from unity at small $-t$,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1404.3985
6
6.0
Jun 30, 2018
06/18
by
L. Tang; C. Chen; T. Gogami; D. Kawama; Y. Han; L. Yuan; A. Matsumura; Y. Okayasu; T. Seva; V. M. Rodriguez; P. Baturin; J. Pochodzalla; X. Qiu; S. Randeniya; B. Raue; J. Reinhold; R. Rivera; J. Roche; C. Samanta; Y. Sato; B. Sawatzky; A. Acha; E. K. Segbefia; D. Schott; A. Shichijo; N. Simicevic; G. Smith; Y. Song; M. Sumihama; V. Tadevosyan; T. Takahashi; N. Taniya; P. Achenbach; K. Tsukada; V. Tvaskis; M. Veilleux; W. Vulcan; S. Wells; F. R. Wesselmann; S. A. Wood; T. Yamamoto; C. Yan; Z....
texts
eye 6
favorite 0
comment 0
Since the pioneering experiment, E89-009 studying hypernuclear spectroscopy using the $(e,e^{\prime}K^+)$ reaction was completed, two additional experiments, E01-011 and E05-115, were performed at Jefferson Lab. These later experiments used a modified experimental design, the "tilt method", to dramatically suppress the large electromagnetic background, and allowed for a substantial increase in luminosity. Additionally, a new kaon spectrometer, HKS (E01-011), a new electron...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1406.2353
5
5.0
Jun 28, 2018
06/18
by
Alberica Toia; for the ALICE Collaboration
texts
eye 5
favorite 0
comment 0
Measurements of the transverse momentum spectra of light flavor particles at intermediate and high pT are an important tool for QCD studies. In pp collisions they provide a baseline for perturbative QCD, while in Pb-Pb they are used to investigate the suppression caused by the surrounding medium. In p-Pb collisions, such measurements provide a reference to disentangle final from initial state effects and thus play an important role in the search for signatures of the formation of a deconfined...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1510.08730
6
6.0
Jun 28, 2018
06/18
by
D. McGlinchey; for the PHENIX Collaboration
texts
eye 6
favorite 0
comment 0
Heavy quarks are an ideal probe of the quark gluon plasma created in heavy ion collisions. They are produced in the initial hard scattering and therefore experience the full evolution of the medium. PHENIX has previously measured the modification of heavy quark production in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV via electrons from semileptonic decays, which indicated substantial modifications of the parent hadron momentum distribution. The PHENIX barrel silicon vertex detector (VTX),...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1512.08465
3
3.0
Jun 28, 2018
06/18
by
Christopher Bruner; Michael Murray for the CMS Collaboration
texts
eye 3
favorite 0
comment 0
The almost hermetic coverage of CMS is used to measure the distribution of transverse energy as a function of pseudo-rapidity for pPb collisions at $\sqrt{s_{NN}} = 5.02$ TeV. For minimum bias collisions $(1/N)~dE_T/d\eta$ reaches 23 GeV which implies an $E_T$ per participant pair comparable to that of peripheral PbPb collisions at $\sqrt{s_{NN}} = 2.76$ TeV. The centrality dependence of transverse energy production has been studied using centrality measures defined in three different angular...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1512.09217
4
4.0
Jun 28, 2018
06/18
by
Prakhar Garg
texts
eye 4
favorite 0
comment 0
The RHIC Beam Energy Scan focuses on mapping the QCD phase diagram and pinpointing the location of a possible critical end point. Bose-Einstein correlations and event-by-event fluctuations of conserved quantities, measured as a function of centrality and collision energy, are promising tools in these studies. Recent lattice QCD and statistical thermal model calculations predict that higher-order cumulants of the fluctuations are sensitive indicators of the phase transition. Products of these...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1512.09231
3
3.0
Jun 29, 2018
06/18
by
Jochen Thäder
texts
eye 3
favorite 0
comment 0
Studying fluctuations of conserved quantities, such as baryon number, strangeness, and charge, provides insights into the properties of matter created in high-energy nuclear collisions. Lattice QCD calculations suggest that higher moments of these quantities are sensitive to the phase structure of the hot and dense nuclear matter created in such collisions. In this paper, we present first experimental results of volume and temperature independent cumulant ratios of net-charge and net-proton...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1601.00951
12
12
Jun 29, 2018
06/18
by
I. Denisenko; A. V. Anisovich; V. Crede; H. Eberhardt; E. Klempt; V. A. Nikonov; A. V. Sarantsev; H. Schmieden; U. Thoma; A. Wilson
texts
eye 12
favorite 0
comment 0
Data on the reaction $\gamma p\to \omega p$ with $\omega\to\pi^0\gamma$, taken with unpolarized or polarized beams in combination with an unpolarized or polarized proton-target, were analyzed within the Bonn-Gatchina (BnGa) partial wave analysis. Differential cross sections, several spin density matrix elements, the beam asymmetry $\Sigma$, the normalized helicity difference $E$, and the correlation $G$ between linear photon and longitudinal target polarization were included in a large data...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1601.06092
6
6.0
Jun 29, 2018
06/18
by
B. Bucher; S. Zhu; C. Y. Wu; R. V. F. Janssens; D. Cline; A. B. Hayes; M. Albers; A. D. Ayangeakaa; P. A. Butler; C. M. Campbell; M. P. Carpenter; C. J. Chiara; J. A. Clark; H. L. Crawford; M. Cromaz; H. M. David; C. Dickerson; E. T. Gregor; J. Harker; C. R. Hoffman; B. P. Kay; F. G. Kondev; A. Korichi; T. Lauritsen; A. O. Macchiavelli; R. C. Pardo; A. Richard; M. A. Riley; G. Savard; M. Scheck; D. Seweryniak; M. K. Smith; R. Vondrasek; A. Wiens
texts
eye 6
favorite 0
comment 0
The neutron-rich nucleus $^{144}$Ba ($t_{1/2}$=11.5 s) is expected to exhibit some of the strongest octupole correlations among nuclei with mass numbers $A$ less than 200. Until now, indirect evidence for such strong correlations has been inferred from observations such as enhanced $E1$ transitions and interleaving positive- and negative-parity levels in the ground-state band. In this experiment, the octupole strength was measured directly by sub-barrier, multi-step Coulomb excitation of a...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1602.01485
3
3.0
Jun 29, 2018
06/18
by
CLAS Collaboration; C. A. Paterson; D. G. Ireland; K. Livingston; B. McKinnon
texts
eye 3
favorite 0
comment 0
Background: Measurements of polarization observables for the reactions $\vec{\gamma} p \rightarrow K^+ \Lambda$ and $\vec{\gamma} p \rightarrow K^+ \Sigma^0$ have been performed. This is part of a programme of measurements designed to study the spectrum of baryon resonances. Purpose: The accurate measurement of several polarization observables provides tight constraints for phenomenological fits. Beam-recoil observables for the $\vec{\gamma} p \rightarrow K^+ \Sigma^0$ reaction have not been...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1603.06492
3
3.0
Jun 29, 2018
06/18
by
J. T. Mitchell; D. V. Perepelitsa; M. J. Tannenbaum; P. W. Stankus
texts
eye 3
favorite 0
comment 0
Several methods of generating three constituent-quarks in a nucleon are evaluated which explicitly maintain the nucleon's center of mass and desired radial distribution and can be used within Monte Carlo Glauber frameworks. The geometric models provided by each method are used to generate distributions over the number of constituent-quark participants ($N_{qp}$) in $p+p$, $d+$Au and Au$+$Au collisions. The results are compared with each other and to a previous result of $N_{qp}$ calculations,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1603.08836
5
5.0
Jun 29, 2018
06/18
by
Varinderjit Singh; J. Vadas; T. K. Steinbach; S. Hudan; R. T. deSouza; L. T. Baby; S. A. Kuvin; V. Tripathi; I. Wiedenhover
texts
eye 5
favorite 0
comment 0
Measurement of the fusion cross-section for neutron-rich light nuclei is crucial in ascertaining if fusion of these nuclei occurs in the outer crust of a neutron star. The fusion excitation function at near-barrier energies for the $^{19}$O + $^{12}$C system was measured and the experimental results are compared to the fusion excitation function of $^{18}$O + $^{12}$C and $^{16}$O + $^{12}$C. The experiment was performed by utilizing a beam of $^{19}$O, produced via the $^{18}$O(d,p) reaction,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1603.09314
4
4.0
Jun 30, 2018
06/18
by
Dmitri Peressounko; for the ALICE collaboration
texts
eye 4
favorite 0
comment 0
Measurements of direct photon and neutral pion production in heavy-ion collisions provide a comprehensive set of observables characterizing properties of the hot QCD medium. Direct photons provide means to test the initial stage of an AA collision and carry information about the temperature and space-time evolution of the hot medium. Neutral pion suppression probes the parton energy loss in the hot medium. Measurements of neutral meson spectra in pp collisions at LHC energies $\sqrt{s}=$0.9,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1412.7902
14
14
Jun 27, 2018
06/18
by
M. V. Lund; M. J. G. Borge; J. A. Briz; J. Cederkäll; H. O. U. Fynbo; J. H. Jensen; B. Jonson; K. L. Laursen; T. Nilsson; A. Perea; V. Pesudo; K. Riisager; O. Tengblad
texts
eye 14
favorite 0
comment 0
We have observed beta+-delayed alpha and p-alpha emission from the proton-rich nucleus 21Mg produced at the ISOLDE facility at CERN. The assignments were cross-checked with a time distribution analysis. This is the third identified case of beta-p-alpha emission. We discuss the systematic of beta-delayed particle emission decays, show that our observed decays fit naturally into the existing pattern, and argue that the patterns are to a large extent caused by odd-even effects.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1506.03915
15
15
Jun 27, 2018
06/18
by
J. Gulyás; T. J. Ketel; A. J. Krasznahorkay; M. Csatlós; L. Csige; Z. Gácsi; M. Hunyadi; A. Krasznahorkay; A. Vitéz; T. G. Tornyi
texts
eye 15
favorite 0
comment 0
A multi-detector array has been designed and constructed for the simultaneous measurement of energy- and angular correlations of electron-positron pairs. Experimental results are obtained over a wide angular range for high-energy transitions in 16O, 12C and 8Be. A comparison with GEANT simulations demonstrates that angular correlations between 50 and 180 degrees of the electron-positron pairs in the energy range between 6 and 18 MeV can be determined with sufficient resolution and efficiency.
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1504.00489
15
15
Jun 28, 2018
06/18
by
M. V. Lund; M. J. G. Borge; J. A. Briz; J. Cederkäll; H. O. U. Fynbo; J. H. Jensen; B. Jonson; K. L. Laursen; T. Nilsson; A. Perea; V. Pesudo; K. Riisager; O. Tengblad
texts
eye 15
favorite 0
comment 0
Beta-delayed proton emission from $^{21}$Mg has been measured at ISOLDE, CERN, with a detection setup including particle identification capabilities. $\beta$-delayed protons with center of mass energies between 0.39$\,$MeV and 7.2$\,$MeV were measured and used to determine the half life of $^{21}$Mg as $118.6\pm 0.5\,$ms. From a line shape fit of the $\beta p$ branches we extract spectroscopic information about the resonances of $^{21}$Na. Finally an improved interpretation of the decay scheme...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1506.04515
12
12
Jun 28, 2018
06/18
by
ALICE Collaboration
texts
eye 12
favorite 0
comment 0
The production of (anti-)deuteron and (anti-)$^{3}$He nuclei in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV has been studied using the ALICE detector at the LHC. The spectra exhibit a significant hardening with increasing centrality. Combined blast-wave fits of several particles support the interpretation that this behavior is caused by an increase of radial flow. The integrated particle yields are discussed in the context of coalescence and thermal-statistical model expectations. The...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1506.08951
9
9.0
Jun 28, 2018
06/18
by
H. Heylen; C. Babcock; J. Billowes; M. L. Bissell; K. Blaum; P. Campbell; B. Cheal; R. F. Garcia Ruiz; Ch. Geppert; W. Gins; M. Kowalska; K. Kreim; S. M. Lenzi; I. D. Moore; R. Neugart; G. Neyens; W. Nörtershäuser; J. Papuga; D. T. Yordanov
texts
eye 9
favorite 0
comment 0
The odd-odd 54;56;58;60;62;64Mn isotopes (Z = 25) were studied using bunched-beam collinear laser spectroscopy at ISOLDE, CERN. From the measured hyperfine spectra the spins and magnetic moments of Mn isotopes up to N = 39 were extracted. The previous tentative ground state spin assignments of 58;60;62;64Mn are now firmly determined to be I = 1 along with an I = 4 assignment for the isomeric states in 58;60;62Mn. The I = 1 magnetic moments show a decreasing trend with increasing neutron number...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1508.06207
15
15
Jun 28, 2018
06/18
by
K. L. Jones; S. Ahn; J. M. Allmond; A. Ayres; D. W. Bardayan; T. Baugher; D. Bazin; J. S. Berryman; A. Bey; C. Bingham; L. Cartegni; G. Cerizza; K. Y. Chae; J. A. Cizewski; A. Gade; A. Galindo-Uribarri; R. F. Garcia-Ruiz; R. Grzywacz; M. E. Howard; R. L. Kozub; J. F. Liang; B. Manning; M. Matos; S. McDaniel; D. Miller; C. D. Nesaraja; P. D. O'Malley; S. Padgett; E. Padilla-Rodal; S. D. Pain; S. T. Pittman; D. C. Radford; A. Ratkiewicz; K. T. Schmitt; A. Shore; M. S. Smith; D. W. Stracener; S....
texts
eye 15
favorite 0
comment 0
Direct reaction techniques are powerful tools to study the single-particle nature of nuclei. Performing direct reactions on short-lived nuclei requires radioactive ion beams produced either via fragmentation or the Isotope Separation OnLine (ISOL) method. Some of the most interesting regions to study with direct reactions are close to the magic numbers where changes in shell structure can be tracked. These changes can impact the final abundances of explosive nucleosynthesis. The structure of...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1508.06531
4
4.0
Jun 28, 2018
06/18
by
Kolja Kauder for the STAR Collaboration
texts
eye 4
favorite 0
comment 0
The STAR collaboration reports the first measurements of the transverse momentum asymmetry $A_J$ of di-jet pairs in central gold-gold collisions and minimum bias proton-proton collisions at $\sqrt{s_{NN}}=200$ GeV at RHIC. We focus on anti-$k_T$ di-jets with a leading jet $p_T>20$ GeV/$c$ and a subleading jet $p_T>10$ GeV/$c$, with a constituent cut of 2 GeV/$c$, which reduces the effect of the underlying heavy-ion background. We examine the evolution of $A_J$ while reclustering these...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1509.08833
4
4.0
Jun 29, 2018
06/18
by
Alexander Milov for the ATLAS Collaboration
texts
eye 4
favorite 0
comment 0
The study of particle correlations is an important instrument to understand the nature of relativistic heavy ion collisions. Using a wealth of new data available from the recent heavy ion runs of Large Hadron Collider at CERN it becomes possible to study particle correlations in different collisions systems under the same conditions. The results of several recent measurement performed by the ATLAS experiment are reviewed in this proceeding. Measurements are performed using various techniques in...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1612.08164
3
3.0
Jun 30, 2018
06/18
by
D. Kahl; H. Yamaguchi; S. Kubono; A. A. Chen; A. Parikh; D. N. Binh; J. Chen; S. Cherubini; N. N. Duy; T. Hashimoto; S. Hayakawa; N. Iwasa; H. S. Jung; S. Kato; Y. K. Kwon; S. Nishimura; S. Ota; K. Setoodehnia; T. Teranishi; H. Tokieda; T. Yamada; C. C. Yun; L. Y. Zhang
texts
eye 3
favorite 0
comment 0
Background: Type I x-ray bursts are the most frequent thermonuclear explosions in the galaxy, resulting from thermonuclear runaway on the surface of an accreting neutron star. The $^{30}$S($\alpha$,p) reaction plays a critical role in burst models, yet insufficient experimental information is available to calculate a reliable, precise rate for this reaction. Purpose: Our measurement was conducted to search for states in $^{34}$Ar and determine their quantum properties. In particular,...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1701.03088
11
11
Jun 30, 2018
06/18
by
STAR Collaboration; L. Adamczyk; J. K. Adkins; G. Agakishiev; M. M. Aggarwal; Z. Ahammed; N. N. Ajitanand; I. Alekseev; D. M. Anderson; R. Aoyama; A. Aparin; S. Heppelmann; A. Hirsch; G. W. Hoffmann; S. Horvat; T. Huang; B. Huang; X. Huang; H. Z. Huang; T. J. Humanic; D. Arkhipkin; P. Huo; G. Igo; W. W. Jacobs; A. Jentsch; J. Jia; K. Jiang; S. Jowzaee; E. G. Judd; S. Kabana; D. Kalinkin; E. C. Aschenauer; K. Kang; K. Kauder; H. W. Ke; D. Keane; A. Kechechyan; Z. Khan; D. P. Kikoła; I. Kisel;...
texts
eye 11
favorite 0
comment 0
We present measurements of bulk properties of the matter produced in Au+Au collisions at $\sqrt{s_{NN}}=$ 7.7, 11.5, 19.6, 27, and 39 GeV using identified hadrons ($\pi^\pm$, $K^\pm$, $p$ and $\bar{p}$) from the STAR experiment in the Beam Energy Scan (BES) Program at the Relativistic Heavy Ion Collider (RHIC). Midrapidity ($|y|
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1701.07065
9
9.0
Jun 30, 2018
06/18
by
L. Witthauer; M. Dieterle; S. Abt; P. Achenbach; F. Afzal; Z. Ahmed; J. R. M. Annand; H. J. Arends; M. Bashkanov; R. Beck; M. Biroth; N. S. Borisov; A. Braghieri; W. J. Briscoe; F. Cividini; S. Costanza; C. Collicott; A. Denig; E. J. Downie; P. Drexler; M. I. Ferretti-Bondy; S. Gardner; S. Garni; D. I. Glazier; D. Glowa; W. Gradl; M. Günther; G. M. Gurevich; D. Hamilton; D. Hornidge; G. M. Huber; A. Käser; V. L. Kashevarov; S. Kay; I. Keshelashvili; R. Kondratiev; M. Korolija; B. Krusche; A....
texts
eye 9
favorite 0
comment 0
The double polarization observable $E$ and the helicity dependent cross sections $\sigma_{1/2}$ and $\sigma_{3/2}$ were measured for $\eta$ photoproduction from quasi-free protons and neutrons. The circularly polarized tagged photon beam of the A2 experiment at the Mainz MAMI accelerator was used in combination with a longitudinally polarized deuterated butanol target. The almost $4\pi$ detector setup of the Crystal Ball and TAPS is ideally suited to detect the recoil nucleons and the decay...
Topic: Nuclear Experiment
Source: http://arxiv.org/abs/1702.01408
