Development of a cryogenic In[formula omitted]O[formula omitted] calorimeter to measure the spectral shape of 115In [formula omitted]-decay.

The spectral shape of forbidden beta-decays is a crucial benchmark for nuclear physics calculations and has important implications also for astroparticle physics. Among the interesting isotopes in this field, 115In is an excellent candidate, being a primordial nuclide featuring a good compromise among Q-value (497.489(10) keV) and half-life (4. 41 × 1 0 14 yr). In this paper, we propose to exploit a cryogenic calorimeter based on a In 2 O 3 crystal to perform a high-precision measurement of the β -decay energy spectrum, discussing also the results obtained within a preliminary test of this crystal and the next steps to improve the detector performance. [ABSTRACT FROM AUTHOR]