13-17 June 2022
Berkeley, CA
US/Pacific timezone

Nuclear Structure of $^{36}$Al and $^{36}$Si via $\beta$-decays of $^{36}$Mg and $^{36}$Al

14 Jun 2022, 12:10
20m
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary

Speaker

Rebeka Sultana Lubna (Facility of Rare Isotope Beams, Michigan State University)

Description

The $\beta$-decays of $^{36}$Mg and $^{36}$Al have been studied at The National Superconducting Cyclotron Laboratory (NSCL) in order to extract the half-lives of the parent nuclei and reveal the nuclear structure of the decaying descendants. Neutron-rich $^{36}$Mg and $^{36}$Al were produced at the NSCL's Coupled Cyclotron Facility via projectile fragmentation of a $^{48}$Ca beam of energy 140 $\text{MeV/u}$ impinged on a 642 $\text{mg/cm}^2$ thick $^{9}$Be target. The fragmented beam was delivered to the decay station after being resolved by the A1900 separator. Two Si p-i-n detectors were used for the particle identification whereas the ions were implanted on a 3-mm thick $\text{CeBr}_3$ scintilator coupled to a position-sensitive photo multiplier tube (PSPMT). The $\beta$-delayed $\gamma$-rays were identified with 16 segmented Ge detector array (SeGA) and 15 $\text{LaBr}_3$ detectors. The half-lives of the two parent nuclei were determined and were compared to the previous measurements. $\beta$-delayed $\gamma$-ray transitions were observed in $^{36}$Al and $^{36}$Si for the first time and their level schemes were built from the correlated $\beta$ decays of $^{36}$Mg and $^{36}$Al. Excited energy states of $^{36}$Al populated by the $\beta$-decay of $^{36}$Mg are proposed, whereas only the ground state information was available prior to this work. The experimental results were interpreted by using the nuclear configuration interaction studies with the FSU shell-model Hamiltonian. The results will shed light on our understanding of the structure of more exotic neutron-rich nuclei to be produced with the FRIB.

Primary author

Rebeka Sultana Lubna (Facility of Rare Isotope Beams, Michigan State University)

Co-authors

Dr Aaron Chester (Facility of Rare Isotope Beams, Michigan State University) Prof. Sean Liddick (Facility of Rare Isotope Beams, Michigan State University) Prof. Benjamin Crider (Mississippi State University) Timilehin Ogunbeku (Mississippi State University) Katherine Childers (Texas A&M University) Partha Chowdhury (The University of Massachusetts Lowell ) Rebecca Lewis (National Superconducting Cyclotron Laboratory, Michigan State University) Stephanie Lyons (National Superconducting Cyclotron Laboratory, Michigan State University.) Shree Neupane (University of Tennessee Knoxville) David Pérez-Loureiro (University of Tennessee Knoxville) Christopher Prokop (Los Alamos National Laboratory) Umesh Silwal (Mississippi State University) Durga Siwakoti (Mississippi State University) Dylan Smith (mississippi state university) Mallory Smith (National Superconducting Cyclotron Laboratory, Michigan State University) Yongchi Xiao (Mississippi State University) Andrea Richard (National Superconducting Cyclotron Laboratory, Michigan State University)

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