# Neutrino 2018 - XXVIII International Conference on Neutrino Physics and Astrophysics

4-9 June 2018
Heidelberg
Europe/Berlin timezone
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# Contribution Poster 0vbb

Poster (participating in poster prize competition)

# Examination and improvement of nuclear matrix elements of double-β decay in QRPA approach

## Speakers

• Dr. Jun TERASAKI

## Primary authors

• Dr. Jun TERASAKI (Institute of Experimental and Applied Physics, Czech Technical University in Prague)

## Session and Location

Monday Session, Poster Wall #35 (Auditorium Gallery Right)

## Abstract content

My presentation will be on the nuclear matrix element (NME) of the neutrinoless double-β decay for determining the effective neutrino mass. The quasiparticle random-phase approximation (QRPA) is used in my study for calculating the nuclear wave functions. In my poster, the calculated NMEs will be presented for $^{150}$Nd and $^{48}$Ca, and the improvements and examinations that I have exploited in the last several years will be shown. I introduce a virtual decay path consisting of two-particle transfers. This path has to give the same NME as that by the real double-β path. This constraint determines the strength of the isoscalar proton-neutron pairing interaction. This method is one of the most useful achievements of my study. I also reproduce the experimental spin-flip charge-exchange transition-strength functions by (p,n) and (n,p) reactions involving $^{48}$Ca and $^{48}$Ti. This calculation gives an important check of the transition density included in the NME.

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