Fri·Dec 17, 2021Friday·December 17, 2021

1. 01*

   Pairing strength in the relativistic mean-field theory determined from fission barrier heights of actinide nuclei and verified by pairing rotation and binding energies

   Taiki Kouno · Chikako Ishizuka🇯🇵 · Tsunenori Inakura🇯🇵 · Satoshi Chiba🇯🇵

   We have studied strength in the BCS pairing force, used as a residual interaction to the relativistic mean-field to reproduce the height of the inner fission barriers for actinide nuclei. It was found that increasing the pairing strength by about 13% makes reproduce the inner fission barriers better over a wide range of actinide nuclei. This result was verified by using the moment-of-inertia of pairing rotational energy, which was introduced to avoid mean-field and odd-mass effects in the pairing interaction to deduce purely the pairing strength. The pairing interaction thus determined could simultaneously improve the description of the binding energy of heavy nuclei as well. As a result, a consistent picture among inner fission barrier, binding energy, and pairing moment of inertia could be obtained in terms of the relativistic mean-field + BCS theory for a broad region of the actinide nuclei.

   ↳ nucl-thnucl-exPTEP(2022)·4 citations
2. 02*

   System dependence of away-side broadening and $\alpha$-clustering light nuclei structure effect in dihadron azimuthal correlations

   Yuan-Zhe Wang🇨🇳 · Song Zhang🇨🇳 · Yu-Gang Ma🇨🇳

   A collision system scan involving $\alpha$-clustered ${}^{12}$C and ${}^{16}$O is studied by using a multiphase transport model for central collisions at $\sqrt{s_{NN}}=6.37$ TeV. Background subtracted away-side dihadron azimuthal correlation is performed via the zero yield at minimum (ZYAM) method from raw signals, and the quantitative parameters, such as RMS width and Kurtosis, seem nicely follow the $A^{-1/3}$ law of the system size if the nucleus has the normal Woods-Saxon nucleon distribution. However, for $\alpha$-clustering light nuclei, specifically for ${}^{12}$C and ${}^{16}$O, the RMS width and Kurtosis of away-side azimuthal correlation are deviated from the baseline of $A^{-1/3}$ law. In addition, the momentum dependence of away-side broadening parameters is also presented. The results show that there is a distinction in away-side broadening parameters of dihadron correlation function between the Woods-Saxon distribution and the $\alpha$-clustered structures, which sheds light on that the collision system scan for dihadron azimuthal correlation as a potential probe to distinguish $\alpha$-clustered nuclei.

   ↳ nucl-thhep-phnucl-exPLB(2022)·35 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.