Experimental investigations relevant for neutrinoless double beta decays and other fundamental tests of the weak interaction
Bernadette Rebeiro (Institut de Physique des 2 Infinis, Lyon, France)
At present there are several large scale experiments ongoing world-wide that aim to find evidence of physics beyond the Standard Model. Many of these experiments are either performed in deep underground laboratories or probe for signatures of new physics via precision tests of fundamental symmetries assumed in the Standard Model.
Neutrinoless double beta decay experiments encompass both these research fields. Some extensions of the Standard Model propose the existence of right-handed weak interactions that could cause neutrinoless double beta decays. However, the current challenge lies in accurate calculation of nuclear matrix elements (NME’s) for such decays. In this talk I will present some recent experimental results that will be useful for future NME calculations for the double beta decay of 136Xe –> 136Ba. I will also describe a high-precision determination of the superallowed branching ratio for the beta decay of 19Ne to 19F. Together with a previously measured beta asymmetry, the measured ftvalue will provide a means to place stringent bounds on right-handed weak interactions.