Tue·Jun 6, 2017Tuesday·June 6, 2017

1. 01*

   $\Omega$ and $\varphi$ in Au + Au ~collisions at \srt~= 200 and 11.5 GeV from a multiphase transport model

   Y. J. Ye🇨🇳 · J. H. Chen🇨🇳 · Y. G. Ma🇨🇳 · S. Zhang🇨🇳 · C. Zhong🇨🇳

   Within the framework of a multiphase transport model, we study the production and properties of $\Omega$ and $\varphi$ in Au + Au collisions with a new set of parameters for $\sqrt{s_{NN}}$ = 200 GeV and with the original set of parameters for $\sqrt{s_{NN}}$ = 11.5 GeV, respectively. The AMPT model with the string melting version provides a reasonable description at $\sqrt{s_{NN}}$ = 200 GeV and while the AMPT model with default version describes the data well at $\sqrt{s_{NN}}$ = 11.5 GeV. It indicates that the system created at top RHIC energy is dominated by partonic interaction and while the hadronic interaction becomes important at lower beam energy, such as $\sqrt{s_{NN}}$ = 11.5 GeV. The comparison of $N({\Omega }^{+}+{\Omega }^{-})/[2N(\varphi )]$ ratio between data and calculations further supports the argument. Our calculations can generally describe the data of nuclear modification factor as well as elliptic flow.

   ↳ nucl-thnucl-exCPC(2017)·17 citations
2. 02*

   Giant dipole resonance in proton capture reactions using an extended quantum molecular dynamics model

   K. Wang🇺🇸 · Y. G. Ma🇨🇳 · G. Q. Zhang🇨🇳 · X. G. Cao🇨🇳 · W. B. He · W. Q. Shen🇨🇳

   Proton capture reaction is an important process concerning the astrophysical origin of the elements. In present work, we focus on giant dipole resonance (GDR) in proton capture reactions, such as ${}^{11}$B$(p,\gamma {)}^{12}$C, ${}^{27}$Al$(p,\gamma {)}^{28}$Si, ${}^{39}$K$(p,\gamma {)}^{40}$Ca, and ${}^{67}$Co$(p,\gamma {)}^{68}$Ni in a framework of an extended quantum molecular dynamics model. The systematic properties of GDR parameters including the peak energy, the strength and full width at half maximum (FWHM) have been studied. The dependence of FWHM on temperature has also been discussed. Some comparisons with experimental data have been presented.

   ↳ nucl-thnucl-exPRC(2017)·10 citations
3. 03*

   Simulating spin dynamics with spin-dependent cross sections in heavy-ion collisions

   Yin Xia🇨🇳 · Jun Xu🇨🇳 · Bao-An Li🇺🇸 · Wen-Qing Shen🇨🇳

   We have incorporated the spin-dependent nucleon-nucleon cross sections into a Boltzmann-Uehling-Uhlenbeck transport model for the first time, using the spin-singlet and spin-triplet nucleon-nucleon elastic scattering cross sections extracted from the phase-shift analyses of nucleon-nucleon scatterings in free space. We found that the spin splitting of the collective flows is not affected by the spin-dependent cross sections, justifying it as a good probe of the in-medium nuclear spin-orbit interaction. With the in-medium nuclear spin-orbit mean-field potential that leads to local spin polarization, we found that the spin-averaged observables, such as elliptic flows of free nucleons and light clusters, becomes smaller with the spin-dependent differential nucleon-nucleon scattering cross sections.

   ↳ nucl-thnucl-exPRC(2017)·9 citations
4. 04*

   On the existence of Rydberg nuclear molecules

   C. A. Bertulani🇺🇸 · T. Frederico🇧🇷 · M. S. Hussein🇧🇷

   Present nuclear detection techniques prevents us from determining if the analogue of a Rydberg molecule exists for the nuclear case. But nothing in nature disallows their existence. As in the atomic case, Rydberg nuclear molecules would be a laboratory for new aspects and applications of nuclear physics. We propose that Rydberg nuclear molecules, which represent the exotic, halo nuclei version, such as 11Be + 11Be, of the well known quasimolecules observed in stable nuclei such as 12C + 12C, might be common structures that could manifest their existence along the dripline. A study of possible candidates and the expected structure of such exotic clustering of two halo nuclei: the Rydberg nuclear molecules, is made on the basis of three diferent methods. It is shown that such cluster structures might be stable and unexpectedly common.

   ↳ nucl-thnucl-exPLB(2017)·4 citations
5. 05*

   Extracting the sigma-term from low-energy pion-nucleon scattering

   Jacobo Ruiz de Elvira🇨🇭 · Martin Hoferichter🇺🇸 · Bastian Kubis🇩🇪 · Ulf-G. Meißner🇩🇪

   We present an extraction of the pion-nucleon ($\pi N$) scattering lengths from low-energy $\pi N$ scattering, by fitting a representation based on Roy-Steiner equations to the low-energy data base. We show that the resulting values confirm the scattering-length determination from pionic atoms, and discuss the stability of the fit results regarding electromagnetic corrections and experimental normalization uncertainties in detail. Our results provide further evidence for a large $\pi N$ $\sigma$-term, ${\sigma }_{\pi N}=58(5)$ MeV, in agreement with, albeit less precise than, the determination from pionic atoms.

   ↳ hep-phhep-latnucl-exnucl-thJ.Phys.G(2018)·138 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.