Nuclear and particle physics aspects of the 2nbb-decay of 150Nd

TL;DR

This paper discusses the potential realization of the Single State Dominance hypothesis in the two-neutrino double beta decay of 150Nd, examining experimental tests, nuclear physics implications, and possible neutrino properties.

Contribution

It analyzes the feasibility of SSD hypothesis testing in 150Nd decay and explores implications of neutrino Pauli principle violation for experimental observations.

Findings

SSD hypothesis likely to be ruled out by precision measurements

Charge-exchange experiments can clarify nuclear state contributions

Neutrino Pauli principle violation could affect decay energy distributions

Abstract

A discussion is given on possible realization of the Single State Dominance (SSD) hypothesis in the case of the two-neutrino double beta decay(2nbb-decay) of 150Nd with 1^- ground state of the intermediate nucleus. We conclude that the SSD hypothesis is expected to be ruled out by precision measurement of differential characteristics of this process in running NEMO 3 or planed SuperNEMO experiments unlike some unknown low-lying 1^+ state of 150Pm does exist. This problem can be solved via (d,2He) charge-exchange experiment on 150Sm. Further, we address the question about possible violation of the Pauli exclusion principle for neutrinos and its consequences for the energy distributions of the 2nbb-decay of 150Nd. This phenomenon might be a subject of interest of NEMO 3 and SuperNEMO experiments as well.