Speaker
Description
Recently, some theoretical nuclear structure works have pointed out the relation between the nuclear matrix elements of neutrinoless double-beta decay, a much sought-after nuclear decay that emits two matter particles without antimatter [1,2], and the corresponding matrix elements of double-gamma decay from the double isobaric analog states (DIAS) of the initial double-beta decay nuclei [3,4]. However, the DIAS appear at high excitation energies, and their double-gamma decay competes with faster decay channels such as particle emission or single-gamma decay, making their measurement very challenging.
In this talk I will present recent results [5] comparing the width of the double-gamma decay of DIAS of double-beta emitters and these competing channels, focusing on the lightest Ti48 but also covering heavier nuclei. Our preliminary results support the feasibility of measurements of double-gamma decay of DIAS, which can provide very previous insights on the nuclear matrix elements of neutrinoless double-beta decay.
[1] M. Agostini, G. Benato, J. Detwiler, J. Menéndez, and F. Vissani, Rev. Mod. Phys. 95 025002 (2023)
[2] J. J. Gómez-Cadenas, J. Martı́n-Albo, J. Menéndez, M. Mezzetto, F. Monrabal, and
M. Sorel, Riv. Nuovo Cim. 46 619 (2023)
[3] B. Romeo, J. Menéndez, and C. Peña-Garay, Phys. Lett. B 827 136965 (2022)
[4] L. Jokiniemi and J. Menéndez, Phys. Rev. C 107 044316 (2023)
[5] B. Romeo, D. Stramaccioni, J. Menéndez and J.J. Valiente-Dobón, in preparation
