Thu·Mar 4, 2021Thursday·March 4, 2021

1. 01*

   Pseudo spin doublet bands and Gallagher Moszkowski doublet bands in ${}^{100}$Y

   E. H. Wang🇺🇸 · J. H. Hamilton🇺🇸 · A. V. Ramayya🇺🇸 · C. J. Zachary🇺🇸 · A. Lemasson🇫🇷 · A. Navin🇫🇷 · M. Rejmund🇫🇷 · S. Bhattacharyya🇮🇳 · Q. B. Chen🇨🇳 · S. Q. Zhang🇨🇳 · J. M. Eldridge🇺🇸 · J. K. Hwang🇺🇸 and 12 other authors

   New transitions in neutron rich ${}^{100}$Y have been identified in a ${}^9$Be+${}^{238}$U experiment with mass- and Z- gates to provide full fragment identification. These transitions and high spin levels of ${}^{100}$Y have been investigated by analyzing the high statistics $\gamma$-$\gamma$-$\gamma$ and $\gamma$-$\gamma$-$\gamma$-$\gamma$ coincidence data from the spontaneous fission of ${}^{252}$Cf at the Gammasphere detector array. Two new bands, 14 new levels and 23 new transitions have been identified. The $K^{\pi }=4^{+}$ new band decaying to an 1s isomeric state is assigned to be the high-$K$ Gallagher-Moszkowski (GM) partner of the known $K^{\pi }=1^{+}$ band, with the $\pi 5/2[522]\otimes \nu 3/2[411]$ configuration. This 4${}^{+}$ band is also proposed to be the pseudo spin partner of the new $K^{\pi }=5^{+}$ band with a 5${}^{+}$ $\pi 5/2[422]\otimes \nu 5/2[413]$ configuration, to form a $\pi 5/2[422]\otimes \nu [312$ $5/2,3/2]$ neutron pseudospin doublet. Constrained triaxial covariant density functional theory and quantal particle rotor model calculations have been applied to interpret the band structure and available electromagnetic transition probabilities and are found in good agreement with experimental values.

   nucl-exnucl-thPRC(2021)·7 citations
2. 02*

   Property investigation for different wedge-shaped CsI(Tl)s

   G. Li · J. L. Lou🇨🇳 · Y. L. Ye🇨🇳 · H. Hua🇨🇳 · H. Wang · J. X. Han🇨🇳 · W. Liu · S. W. Bai · Z. W. Tan🇨🇳 · K. Ma · J. H. Chen · L. S. Yang and 23 other authors

   Two types of wedge-shaped CsI(Tl)s were designed to be placed behind the annular double-sided silicon detectors (ADSSDs) to identify the light charged particles with the $\Delta E-E$ method. The properties of CsI(Tl)s with different shapes and sizes, such as energy resolution, light output non-uniformity and particle identification capability, were compared by using a $\alpha$-source and a radioactive beam of ${}^{15}$C. The big-size CsI(Tl) was finally adopted to form the $\Delta E-E$ telescope due to better properties. The property differences of these two types of CsI(Tl)s can be interpreted based on the Geant4 simulation results.

   ↳ physics.ins-detnucl-ex0 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.