Speaker
Description
The nuclear structure of doubly magic nuclei, such as $^{100}$Sn and its neighboring isotopes, has attracted significant attention from both experimental and theoretical perspectives. This interest stems from the unique insights these nuclei offer for testing the nuclear shell model and their relevance to the astrophysical rapid-proton capture process [1].
While the region near $^{100}$Sn is challenging to access experimentally, lifetime measurements of the first excited states in nearby nuclei, such as $^{102,103}$Sn, are crucial for quantifying the evolution of nuclear shell structure and assessing the balance between pairing and quadrupole correlations [2].
In this contribution, we present recent results on lifetime measurements in $^{102}$Sn. The experiment was conducted in May 2021 as part of the FAIR phase-0 campaign at GSI, utilizing the DEcay SPECstroscopy setup [3]. Nuclei of interest were produced via fragmentation reactions of a $^{124}$Xe beam on a $^{9}$Be target and subsequently identified using the FRS separator. The Sn isotopes were stopped in the AIDA array, with decaying gamma rays collected by the FATIMA array. This setup allowed for direct lifetime measurements with precision up to a few tens of picoseconds.
We will discuss our findings and their potential interpretation in terms of seniority symmetry conservation and core-breaking effects. These results provide valuable insights into the nuclear structure near $^{100}$Sn and contribute to our understanding of shell evolution in exotic nuclei.
[1] T. Faestermann, M. Górska, H. Grawe, Prog. Part. Nucl. Phys. 69 (2013) 85.
[2] M. Siciliano et al., Phys. Lett. B 806, 135474 (2020).
[3] A.K. Mistry et al., Nucl. Instr. Meth. A 1033 (2022) 166662.
