Simulation studies of neutron-induced background for 0νββ decay in ¹²⁴Sn from underground rock activity at INO

The TIN,TIN detector (The INdia-based TIN detector) comprising cryogenic bolometer array of Tin detector elements is under development for a feasibility study to search for 0νββ decay in ¹²⁴Sn. Given the rarity of the process of 0νββ decay where T_1/2 > 10²⁰ yrs, understanding and minimization of background is very important. Of the different sources of background, neutrons are the most difficult to suppress and hence crucial to understand. It is crucial to estimate the contribution of neutron induced background in an underground laboratory and from the surrounding detector materials. The simulation studies for neutron spectra in the INO cavern and the shield design have been initiated. Some of the results are presented here