Speaker
Description
The investigation of nuclei surrounding doubly-magic isotopes, such as $^{132}\mathrm{Sn}$, represents a fundamental approach for gaining deeper insights into the nuclear structure. However, the region of neutron-rich tin isotopes remains relatively unexplored, and experimental information is limited.
The only $\beta$-decay study of $^{124}\mathrm{In}$ to the excited states in $^{124}\mathrm{Sn}$ have been performed in the 1970s at the Studsvik laboratory [1]. This work was a basis for the $1^+$ spin-parity assignment of the $^{124}\mathrm{In}$ ground state. However, since then, the $3^+$ assigment was, first, proposed in the $\beta$-decay study of $^{124}\mathrm{Cd}$ [2] and later confirmed by laser spectroscopy [4]. In a recent mass measurement study, the excitation energy of the $^{124m}\mathrm{In}$ was reported for the first time [3]. In addition, a reversed order of the two long-lived states, with $8^-$ being assigned as the ground state, was proposed [3]. These studies encouraged us to revise the existing $\beta$-decay scheme of $^{124}\mathrm{In}$.
The excited states in $^{124}\mathrm{Sn}$ populated via $\beta$-decay of $^{124}\mathrm{In}$ were studied at the ISOLDE Decay Station. A pure beam of $^{124}\mathrm{In}$ was delivered by means of laser ionization provided by RILIS. The $\beta\gamma\gamma$ coincidence analysis of the collected data points to identification of new $\gamma$-ray transitions. The preliminary results also suggest significant discrepancies between this work and the previous study [1].
[1] B. Fogelberg and P. Carle, Nucl. Phys. A 323, 205 (1979).
[2] J. C. Batchelder et al., Phys. Rev. C 94, 024317 (2016).
[3]D. A. Nesterenko et al., Phys. Rev. C (2023) - accepted.
https://arxiv.org/abs/2306.11505
[4] A. Vernon, Evolution of the indium proton-hole states up to N = 82 studied with laser spectroscopy, PhD Thesis (2019).
