Preliminary study of feasibility of an experiment looking for excited state double beta transitions in tin

TL;DR

This study assesses the feasibility of detecting excited state double beta decay in tin isotopes using ultra-low background detectors, providing initial sensitivity estimates and discussing potential improvements for future experiments.

Contribution

It presents a preliminary feasibility analysis of a new experiment to search for double beta decay in tin isotopes, including sensitivity estimates and experimental considerations.

Findings

Half-life limits of ~10^{17}-10^{18} years for certain decay modes in tin isotopes.

Estimated radioactive contamination levels of the tin sample.

Discussion on enhancing sensitivity with larger detector mass.

Abstract

An attempt to study the feasibility of a new experiment to search for double beta decay in $^{112}$Sn and $^{124}$Sn was carried out by using ultra-low background HPGe detector (244 cm$^{3}$) inside the Gran Sasso National Laboratory (LNGS) of the INFN (Italy). A small sample of natural Sn was examined for 2367.5 h. The radioactive contamination of the sample has been estimated. The data has also been considered to calculate the present sensitivity for the proposed search; half-life limits $\sim$ $10^{17} - 10^{18}$ years for $\beta^{+}$EC and EC-EC processes in $^{112}$Sn and $\sim$ $10^{18}$ years for $\beta^{-}\beta^{-}$ transition in $^{124}$Sn were measured. In the last section of the paper the enhancement of the sensitivity for a proposed experiment with larger mass to reach theoretically estimated values of half-lives is discussed.