On the possibility to measure nuclear matrix elements of neutrinoless double beta decay in charge-exchange reactions

Vadim Rodin; Amand Faessler

doi:10.1016/j.ppnp.2011.01.048

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arXiv · 1012.5176

On the possibility to measure nuclear matrix elements of neutrinoless double beta decay in charge-exchange reactions

Vadim Rodin·Amand Faessler

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Abstract

As shown in Ref.\cite{Rod09}, the Fermi nuclear matrix element $M^{0\nu}_F$ of neutrinoless double beta ($0\nu\beta\beta$) decay can be reconstructed if one is able to measure the isospin-forbidden single Fermi transition matrix element from the ground state of the final nucleus to the isobaric analog state (IAS) of the initial nucleus, for instance by means of charge-exchange reactions of the $(n,p)$-type. Here, simple estimates for $^{82}$Se are made which show that indeed the tiny cross section $\sigma_{np}(0_f^+\to IAS)$ is dominated by the admixture of the double IAS in the ground state of the final nucleus provided that the isospin mixing is weak and can be treated perturbatively. A measurement of such a cross section would definitely be a very difficult task, but it can advance a lot our knowledge of the $0\nu\beta\beta$ nuclear matrix element.

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Vadim Rodin, Amand Faessler. 2010-12-23. On the possibility to measure nuclear matrix elements of neutrinoless double beta decay in charge-exchange reactions. https://doi.org/10.1016/j.ppnp.2011.01.048

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