Extending axions searches with a spherical TPC

Understand

We present the prospects for detection of KK-axions using a large volume spherical TPC through natural decay to two gammas.

• The higher excited mass states of this axion model allows to reach densities which could be detectable by this method.
• We show the capability of this detector to detect 2-prong events coming from rest-mass axion decays and we provide efficiencies obtained under some gas mixtures and pressure conditions.
• The sensitivity limit of a future experiment with existing detectors geometry has been estimated for the case of zero background limit.