Winter Nuclear Particle Physics (WNPPC) 2018

Decay Spectroscopy of Neutron-Rich Cd Around the N=82 Shell Closure (student talk)

16 Feb 2018, 11:00

15m

Session #2

Speaker

Nikita Bernier (TRIUMF/UBC)

Description

The neutron-rich Cadmium isotopes around the well-known magic numbers at $Z=50$ and $N=82$ are prime candidates to study the evolving shell structure observed in exotic nuclei. Additionally, the extra binding energy observed around the nearby doubly-magic ${}^{132}$Sn has direct correlations in astrophysical models, leading to the second r-process abundance peak at $A\approx 130$ and the corresponding waiting-point nuclei around $N=82$. The $\beta$-decay of the $N=82$ isotope ${}^{130}$Cd into ${}^{130}$In was first studied a decade ago [1], but the information for states of the lighter indium isotope (${}^{128}$In) is still limited. Detailed $\beta \gamma$-spectroscopy of ${}^{128}$Cd was accomplished using the GRIFFIN [2] facility at TRIUMF, which is capable of performing spectroscopy down to rates of 0.1 pps. The ongoing analysis of the ${}^{128,131,132}$Cd will be presented. Already in ${}^{128}$Cd, 23 new transitions and 15 new states have been observed in addition to the 4 previously observed excited states [3]. These new results are compared with recent Shell Model calculations. For ${}^{131}$Cd, results will be compared with the recent EURICA data. These data highlight the unique capabilities of GRIFFIN for decay spectroscopy on the most exotic, short-lived isotopes, and the necessity to re-investigate even "well-known" decay schemes for missing transitions. [1] I. Dillmann et al., Phys. Rev. Let. $91$, 162503 (2003) [2] C.E. Svensson and A.B. Garnsworthy, Hyperfine Int. $225$, 127 (2014) [3] B. Fogelberg, Proc. Intern. Conf. Nuclear Data for Science and Technology, Mito, Japan, p.837 (1988)

Presentation materials

Slides

Nikita_WNPPC2018.pdf