Ponente
Descripción
$^{100}$Sn is the last double magic N=Z nucleus that remains stable considering particle emission. Studying its beta decay is challenging and interesting [1-3], since it is very difficult to produce and the beta decay of $^{100}$Sn shows the lowest estimated Logft or the largest B(GT) (superallowed Gamow-Teller (GT) transition) in the entire nuclide chart. This decay also holds the key for a better understanding of the quenching of the $g_A$ constant in the nuclear medium. Up to know the limited production has constrained the possibility of establishing a firm level scheme populated in the beta decay. The present level scheme of the beta decay into $^{100}$In is based on very limited gamma-gamma coincidences and on a comparison with shell model predictions [1,2]. We propose here to further study the beta decay of $^{100}$Sn using the upgraded intensities of the primary beams at RIFB and the improved efficiency of the new gamma array.
Around $^{100}$Sn, it is also worth studying further the beta decay of $^{98}$Cd. The only data available related to this decay comes from a study performed at ISOLDE in 1992 with limited efficiency [4]. $^{98}$Cd beta decay is one of the cases which resembles better the $^{100}$Sn decay. Recent mass measurements in the region [5] seem to fix partially the conflict of the two different B(GT) values obtained by Hinke et al. [1] and Lubos et al. [2], by looking at the trends predicted by shell model calculations and relying on the beta strength of this decay determined at ISOLDE [4]. Considering the relevance of this data, a new study of its beta decay using a more efficient setup is also desirable.
[1] C.B. Hinke, et al., Nature 486 (2012) 341.
[2] D. Lubos, et al., Phys. Rev. Lett. 122 (2019) 222502.
[3] T. Faestermann, et al., Prog. Part. Nucl. Phys. 69 (2013) 85; M. Górska, Physics 4 (2022) 364.
[4] A. Plochocki et al., Z. Phys. A Hadrons and Nuclei 342, (1992) 43
[5] A. Mollaebrahimi et al., Physics Letters B 839 (2023) 137833
