Nuclear Theory·nucl-th

Monday·January 19, 2015

13 papers—8 primary·5 cross-listed

01
[Submitted on 16 Jan 2015]
Possible observables for the chiral electric separation effect in Cu + Au collisions
Guo-Liang Ma🇨🇳 · Xu-Guang Huang🇨🇳
The quark-gluon plasma (QGP) generated in relativistic heavy-ion collisions could be locally parity-odd. In parity-odd QGP, the electric field may induce a chiral current which is called the chiral electric separation effect (CESE). We propose two possible observables for CESE in Cu + Au collisions: The first one is the correlation $ζ_{α β} = ⟨ cos [2 (ϕ_{α} + ϕ_{β} - 2 Ψ_{RP})]⟩$ ; the second one is the charge-dependent event-plane angle $Ψ_{2}^{q}$ with $q = \pm$ being charge. Nonzero $Δ ζ = ζ_{o pp} - ζ_{s am e}$ and $ΔΨ = ⟨ ∣ Ψ_{2}^{+} - Ψ_{2}^{-} ∣ ⟩$ may signal the CESE in Cu + Au collisions. Within a multiphase transport model, we study how the final state interaction affects these observables. We find that the correlation $γ_{α β} = ⟨ cos (ϕ_{α} + ϕ_{β} - Ψ_{RP})⟩$ is sensitive to the out-of-plane charge separation caused by the chiral magnetic effect and to the in-plane charge separation caused by the in-plane electric field, but it is not sensitive to the CESE. On the other hand, $Δ ζ$ and $ΔΨ$ are sensitive to the CESE. Therefore, we suggest that the future experiments measure the above observables in Cu+Au collisions in order to disentangle different chiral and charge separation mechanisms.
Comments:
6 pages, 6 figures, final published version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1501.03903 [pdf]
PRC(2015)·19 citations
02
[Submitted on 16 Jan 2015]
The structural evolution in transitional nuclei of mass 80 $\leq$ A $\leq$ 132
M. Bhuyan
In this theoretical study, we report an investigation on the behavior of two neutron separation energy, differential variation of the separation energy and the abnormality in nuclear charge radius along the isotopic and isotonic chains of transition nuclei. We have used relativistic mean field formalism with NL3 and NL3 $^{*}$ forces for this present analysis. The study refers to {\it even-even} nuclei such as Zr, Mo, Ru and Pd with $N$ = 40 $-$ 86, where a rich collective phenomena such as proton radioactivity, cluster or nucleus radioactivity, exotic shapes, {\it Island of Inversion} and etc. are observed. These non-monotonic aspects over the isotopic chain are mainly correlated with the structural properties like shell/sub-shell closures, shape transition, clustering and magicity etc. In addition to these, we have shown the internal configuration of these nuclei to get a further insight into the reason for these discrepancies.
Comments:
8 pages, 6 figures and 2 tables
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.03911 [pdf]
PRC(2015)·56 citations
03
[Submitted on 16 Jan 2015]
On spontaneous fission and alpha-decay half-lives of atomic nuclei
K. Pomorski · M. Warda · A. Zdeb
It is shown, that the Gamow-like model with only one adjustable parameter - radius constant is able to reproduce well the alpha-decay half-lives for all even-even nuclei with the proton number larger than 50. The systematics for odd-A and odd-odd isotopes can be also well described when ones introduces an additional hindrance factor. Similar model based on the W. J. Swiatecki idea from 1955 is developed to reproduce the spontaneous fission half-lives of transactinide nuclei. The achieved accuracy of reproduction of the data is better than that obtained in more advanced theories.
Comments:
11 pages, 13 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.03912 [pdf]
Phys.Scripta(2015)·14 citations
04
[Submitted on 16 Jan 2015]
Using electron scattering to constrain the axial-vector form factor
R. González-Jiménez🇪🇸 · J. A. Caballero🇪🇸 · T. W. Donnelly🇺🇸
We present an analysis of elastic and quasielastic parity-violating (PV) electron scattering processes. These reactions can help to constrain the weak neutral current form factors of the nucleon that play an essential role in the description of neutrino cross sections at intermediate energies. We show that combining information from the analysis of elastic and quasielastic reactions the current knowledge on the strange and axial-vector form factors can be significantly improved.
Comments:
Proceedings of 16th International Workshop on Neutrino Factories and Future Neutrino Beam Facilities - NUFACT2014, 25 -30 August, 2014. University of Glasgow, United Kingdom
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.03937 [pdf]
PoS(2015)·2 citations
05
[Submitted on 16 Jan 2015]
Origin of Temperature of Quark-Gluon Plasma in Heavy Ion Collisions
Xiao-Ming Xu🇨🇳
Initially produced quark-gluon matter at RHIC and LHC does not have a temperature. A quark-gluon plasma has a high temperature. From this quark-gluon matter to the quark-gluon plasma is the early thermalization or the rapid creation of temperature. Elastic three-parton scattering plays a key role in the process. The temperature originates from the two-parton scattering, the three-parton scattering, the four-parton scattering and so forth in quark-gluon matter.
Comments:
6 pages, proceedings for the XXX-th International Workshop on High Energy Physics
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th)
arXiv:
1501.03970 [pdf]
0 citations
06
[Submitted on 16 Jan 2015]
Four-body correlations in nuclei
M. Sambataro · N. Sandulescu
Low-energy spectra of 4 $n$ nuclei are described with high accuracy in terms of four-body correlated structures ("quartets"). The states of all $N \geq Z$ nuclei belonging to the $A = 24$ isobaric chain are represented as a superposition of two-quartet states, with quartets being characterized by isospin $T$ and angular momentum $J$ . These quartets are assumed to be those describing the lowest states in $^{20}$ Ne ( $T_{z}$ =0), $^{20}$ F ( $T_{z}$ =1) and $^{20}$ O ( $T_{z}$ =2). We find that the spectrum of the self-conjugate nucleus $^{24}$ Mg can be well reproduced in terms of $T$ =0 quartets only and that, among these, the $J$ =0 quartet plays by far the leading role in the structure of the ground state. The same conclusion is drawn in the case of the three-quartet $N = Z$ nucleus $^{28}$ Si. As an application of the quartet formalism to nuclei not confined to the $s d$ shell, we provide a description of the low-lying spectrum of the proton-rich $^{92}$ Pd. The results achieved indicate that, in 4 $n$ nuclei, four-body degrees of freedom are more important and more general than usually expected.
Comments:
5 pages, 4 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.04017 [pdf]
PRL(2015)·33 citations
07
[Submitted on 16 Jan 2015]
Quasielastic electron- and neutrino-nucleus scattering in a continuum random phase approximation approach
V. Pandey🇧🇪 · N. Jachowicz🇧🇪 · T. Van Cuyck🇧🇪 · J. Ryckebusch🇧🇪 · M. Martini🇧🇪
We present a continuum random phase approximation approach to study electron- and neutrino-nucleus scattering cross sections, in the kinematic region where quasielastic scattering is the dominant process. We show the validity of the formalism by confronting inclusive ( $e, e^{'}$ ) cross sections with the available data. We calculate flux-folded cross sections for charged-current quasielastic antineutrino scattering off $^{12}$ C and compare them with the MiniBooNE cross-section measurements. We pay special emphasis to the contribution of low-energy nuclear excitations in the signal of accelerator-based neutrino-oscillation experiments.
Comments:
5 pages, 5 figures. Contribution to the proceedings of the 16th International Workshop on Neutrino Factories and Future Neutrino Beam Facilities (NUFACT-2014)
Subjects:
Nuclear Theory (nucl-th)
arXiv:
1501.04018 [pdf]
PoS(2015)·1 citation
08
[Submitted on 16 Jan 2015]
Constraining the Eq. of State of Super-Hadronic Matter from Heavy-Ion Collisions
Scott Pratt🇺🇸 · Evan Sangaline🇺🇸 · Paul Sorensen🇺🇸 · Hui Wang🇺🇸
The equation of state of QCD matter for temperatures near and above the quark-hadron transition (165 MeV) is inferred within a Bayesian framework through the comparison of data from the Relativistic Heavy Ion Collider and from the Large Hadron Collider to theoretical models. State-of- the-art statistical techniques are applied to simultaneously analyze multiple classes of observables while varying 14 independent model parameters. The resulting posterior distribution over possible equations of state is consistent with results from lattice gauge theory.
Comments:
4 pages, 5 figures
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
1501.04042 [pdf]
PRL(2015)·228 citations

Affiliations

first authorsco-authorsvia INSPIRE