Nuclear Theory·nucl-th

Monday·August 28, 2017

7 papers—3 primary·4 cross-listed

01
[Submitted on 25 Aug 2017]
$η$ -nucleus interaction from the $d + d$ reaction around the $η$ production threshold
N. Ikeno🇯🇵 · H. Nagahiro🇯🇵 · D. Jido🇯🇵 · S. Hirenzaki🇯🇵
The $η$ mesic nucleus is considered to be one of the interesting exotic many body systems and has been studied since 1980's theoretically and experimentally. Recently, the formation of the $η$ mesic nucleus in the fusion reactions of the light nuclei such as $d + d \to (η + α) \to X$ has been proposed and the experiments have been performed by WASA-at-COSY. We develop a theoretical model to evaluate the formation rate of the $η$ mesic nucleus in the fusion reactions and show the calculated results. We find that the $η$ bound states could be observed in the reactions in cases with the strong attractive and small absorptive $η$ -nucleus interactions. We compare our results with existing data of the $d + d \to η + α$ and the $d + d \to^{3} He + N + π$ reactions. We find that the analyses by our theoretical model with the existing data can provide new information on the $η$ -nucleus interaction.
Comments:
14 pages, 31 figures, 1 table, submitted to EPJA
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1708.07692 [pdf]
EPJA(2017)·23 citations
02
[Submitted on 24 Aug 2017]
Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method
Takayuki Myo · Hiroshi Toki · Kiyomi Ikeda · Hisashi Horiuchi · Tadahiro Suhara
We developed a new variational method for tensor-optimized antisymmetrized molecular dynamics (TOAMD) for nuclei. In TOAMD, the correlation functions for the tensor force and the short-range repulsion are introduced and used in the power series form of the wave function, which is different from the Jastrow method. Here, nucleon pairs are correlated in multi-steps with different forms, while they are correlated only once including all pairs in the Jastrow correlation method. Each correlation function in every term is independently optimized in the variation of total energy in TOAMD. For $s$ -shell nuclei using the nucleon-nucleon interaction, the energies in TOAMD are better than those in the variational Monte Carlo method with the Jastrow correlation function. This means that the power series expansion using the correlation functions in TOAMD describes the nuclei better than the Jastrow correlation method.
Comments:
7 pages, 4 figures. arXiv admin note: text overlap with arXiv:1706.09560, update references
Subjects:
Nuclear Theory (nucl-th); Strongly Correlated Electrons (cond-mat.str-el)
arXiv:
1708.07748 [pdf]
PRC(2017)·19 citations
03
[Submitted on 24 Aug 2017]
Examining the model dependence of the determination of kinetic freeze-out temperature and transverse flow velocity in small collision system
Hai-Ling Lao🇨🇳 · Fu-Hu Liu🇨🇳 · Bao-Chun Li🇨🇳 · Mai-Ying Duan🇨🇳 · Roy A. Lacey🇺🇸
The transverse momentum distributions of the identified particles produced in small collision systems at the Relativistic Heavy Ion Collider (RHIC) and Large Hadron Collider (LHC) have been analyzed by four models. The first two models utilize the blast-wave model with different statistics. The last two models employ certain linear correspondences based on different distributions. The four models describe the experimental data measured by the Pioneering High Energy Nuclear Interaction eXperiment (PHENIX), Solenoidal Tracker at RHIC (STAR), and A Large Ion Collider Experiment (ALICE) cCollaborations equally well. It is found that both the kinetic freeze-out temperature and transverse flow velocity in the central collisions are comparable with those in the peripheral collisions. With the increase of collision energy from that of the RHIC to that of the LHC, the considered quantities typically do not decrease. Comparing with the central collisions, the proton-proton collisions are closer to the peripheral collisions.
Comments:
17 pages, 9 figures. Nuclear Science and Techniques, Accepted. arXiv admin note: text overlap with arXiv:1703.04944
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
arXiv:
1708.07749 [pdf]
Nucl.Sci.Tech.(2018)·33 citations

Affiliations

first authorsco-authorsvia INSPIRE

η-nucleus interaction from the d+d reaction around the η production threshold

Power series expansion method in tensor-optimized antisymmetrized molecular dynamics beyond the Jastrow correlation method

Examining the model dependence of the determination of kinetic freeze-out temperature and transverse flow velocity in small collision system

Affiliations

$η$ -nucleus interaction from the $d + d$ reaction around the $η$ production threshold