Fri·May 31, 2019Friday·May 31, 2019

1. 01*

   Cross-section measurements of radiative proton-capture reactions in ${}^{112}$Cd at energies of astrophysical interest

   A. Psaltis🇨🇦 · A. Khaliel · E.-M. Assimakopoulou · A. Kanellakopoulos🇧🇪 · V. Lagaki🇨🇭 · M. Lykiardopoulou🇨🇦 · E. Malami🇳🇱 · P. Tsavalas · A. Zyriliou · T. J. Mertzimekis🇬🇷

   Reactions involving the group of nuclei commonly known as p nuclei are part of the nucleosynthetic mechanisms at astrophysical sites. The ${}^{113}$In nucleus is such a case with several open questions regarding its origin at extreme stellar environments. In this work, the experimental study of the cross sections of the radiative proton-capture reaction ${}^{112}$Cd(p,$\gamma$)${}^{113}$In is attempted for the first time at energies lying inside the Gamow window with an isotopically enriched ${}^{112}$Cd target. Two different techniques, the in-beam $\gamma$-ray spectroscopy and the activation method, have been applied. The latter method is required to account for the presence of a low-lying ${}^{113}$In isomer at 392 keV having a halflife of $\approx 100$ min. From the cross sections, the astrophysical S factors and the isomeric ratios have been additionally deduced. The experimental results are compared to detailed Hauser-Feshbach theoretical calculations using TALYS, and discussed in terms of their significance to the optical model potential involved.

   nucl-exPRC(2019)·15 citations
2. 02*

   Two-particle transfer processes as a signature of shape phase transition in Zirconium isotopes

   J.A. Lay🇪🇸 · A. Vitturi🇮🇹 · L. Fortunato🇮🇹 · Y. Tsunoda🇯🇵 · T. Togashi🇯🇵 · T. Otsuka🇯🇵

   We explore two-particle transfer reactions as a unique probe of the occurence of shape coexistence in shape phase transitions. The (t,p) reactions to the ground state and to excited $0^{+}$ states are calculated for the isotope chain of even-even Zirconium isotopes starting from stable nuclei up to beyond current experimental limits. Two-particle spectroscopic factors derived from Monte Carlo Shell Model calculations are used, together with the sequential description of the two-particle transfer reaction mechanism. The calculation shows a clear signature for a shape phase transition between ${}^{98}$Zr and ${}^{100}$Zr, which displays coexistence of a deformed ground state with an excited spherical $0^{+}$ state. Furthermore, we show that there is a qualitative difference with respect to the case of a normal shape phase transition that can be discriminated with two-neutron transfer reactions.

   ↳ nucl-thnucl-exPLB(2023)·8 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.