Fri·Jan 15, 2021Friday·January 15, 2021

1. 01*

   Spectroscopic studies of neutron-rich ${}^{129}$In and its $\beta$-decay daughter, ${}^{129}$Sn, using the GRIFFIN spectrometer

   F.H. Garcia🇨🇦 · C. Andreoiu🇨🇦 · G.C. Ball🇨🇦 · N. Bernier🇨🇦 · H. Bidaman🇨🇦 · V. Bildstein🇨🇦 · M. Bowry🇨🇦 · D.S. Cross🇨🇦 · M.R. Dunlop🇨🇦 · R. Dunlop🇨🇦 · A.B. Garnsworthy🇨🇦 · P.E. Garrett🇨🇦 and 15 other authors

   The $\beta$-decay of neutron-rich ${}^{129}$In into ${}^{129}$Sn was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the $\beta$-decaying isomers. The level scheme of ${}^{129}$Sn has been expanded with thirty-one new $\gamma$-ray transitions and nine new excited levels, leading to a re-evaluation of the $\beta$-branching ratios and level spin assignments. The observation of the $\beta$-decay of the (29/2${}^{+}$) 1911-keV isomeric state in ${}^{129}$In is reported for the first time, with a branching ratio of 2.0(5)$\%$.

   nucl-exPRC(2021)·4 citations
2. 02*

   Transfer reactions between odd-odd and even-even nuclei by using IBFFM

   Ruslan Magaña Vsevolodovna🇮🇹 · Elena Santopinto🇮🇹 · Roelof Bijker🇲🇽

   Spectroscopic Amplitudes (SA) in the Interacting Boson Fermion Fermion Model (IBFFM) are necessary for the computation of $0\nu \beta \beta$ decays but also for cross sections of heavy-ion reactions, in particular, Double Charge Exchange reactions for the NUMEN collaboration, if one does not want to use the closure limit. We present for the first time: i) the formalism and operators to compute in a general case the spectroscopic amplitudes in the scheme IBFFM from an even-even to odd-odd nuclei, in a way suited to be used in reaction code, i.e., extracting the contribution of each orbital; 2) the odd-odd nuclei as described by the old IBFFM are obtained for the first time with the new implementation of Machine Learning (ML) techniques for fitting the parameters, getting a more realistic description. The one body transition densities for ${}^{116}$Cd $\to$ ${}^{116}$In and ${}^{116}$In $\to$ ${}^{116}$Sn are part of the experimental program of the NUMEN experiment, which aims to find constraints on Neutrinoless double beta decay matrix elements.

   ↳ nucl-thnucl-exPRC(2022)·8 citations
3. 03*

   CSHINE for studies of HBT correlation in Heavy Ion Reactions

   Yi-Jie Wang🇨🇳 · Fen-Hai Guan🇨🇳 · Xin-Yue Diao🇨🇳 · Qiang-Hua Wu🇨🇳 · Xiang-Lun Wei🇨🇳 · He-Run Yang🇨🇳 · Peng Ma🇨🇳 · Zhi Qin🇨🇳 · Yu-Hao Qin🇨🇳 · Dong Guo🇨🇳 · Rong-Jiang Hu🇨🇳 · Li-Min Duan🇨🇳 · Zhi-Gang Xiao🇨🇳

   The Compact Spectrometer for Heavy Ion Experiment (CSHINE) is under construction for the study of isospin chronology via the Hanbury Brown$-$Twiss (HBT) particle correlation function and the nuclear equation of state of asymmetrical nuclear matter. The CSHINE consists of silicon strip detector (SSD) telescopes and large-area parallel plate avalanche counters, which measure the light charged particles and fission fragments, respectively. In phase I, two SSD telescopes were used to observe 30 MeV/u ${}^{40}$Ar +${}^{197}$Au reactions. The results presented here demonstrate that hydrogen and helium were observed with high isotopic resolution, and the HBT correlation functions of light charged particles could be constructed from the obtained data.

   ↳ physics.ins-detnucl-exNucl.Sci.Tech.(2021)·34 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.