Experimental Nuclear Matrix Elements for Two Neutrino Double Beta Decays and Single Beta Decays

概要

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Experimental nuclear matrix elements $M^{2\nu}$ for two neutrino double beta decays ($2\nu\beta\beta$) are discussed in terms of experimental nuclear matrix elements for successive single-$\beta$ processes via Fermi-surface (low-lying) quasi-particle states (FSQP). They are reproduced approximately by the sum $\Sigma_{L}M_{k}$ of the $2\nu\beta\beta$ matrix elements $M_{k}$ through $k$-th intermediate quasi-particle states in the Fermi-surface. $M_{k}$ is expressed by using the $\mathrm{GT}(J^{\pi} = 1^{+})$ matrix elements of $M_{i}(k)$ and $M_{f}(k)$ for the successive single-$\beta$ transitions through the $k$-th intermediate state. The single-$\beta$ matrix elements are evaluated from experimental data of single-$\beta$, EC and charge exchange reactions.
Physical Society of Japanの論文
2009-07-15