Double Gamow Teller transition and its relation to neutrinoless double beta decay matrix element

by Noritaka Shimizu (Center for Nuclear Study, University of Tokyo)

Tuesday 10 Jul 2018, 13:30 → 15:00 Asia/Tokyo

room 201 (RIBF Hall)

=Date and Place=

Jul. 10th(Tue.) 13:30~ at RIBF Hall(room 201)

 

=Lecturer=

Associate Prof. Noritaka Shimizu

(Center for Nuclear Study, The University of Tokyo)

 

=Title=

"Double Gamow Teller transition and its relation to neutrinoless double beta decay matrix element"

 

=Abstract=

The double Gamow-Teller (DGT) resonance is of particular interest not only as an exotic collective excitation, but also in relevance to the neutrinoless double-beta (0nbb) decay. In this talk, I will present our theoretical studies of the DGT transition and its relevance to 0nbb-decay nuclear matrix element (NME) based on shell-model calculations. The shell-model study reveals that the centroid energy and the width of the DGT strength distribution of 48Ca are sensitive to the isovector and isoscalar pairing interactions, respectively. We also found a simple relation between the centroid energy of the 48Ca DGT giant resonance and the 0nbb-decay NME. More generally, we observe a very good linear correlation between the DGT transition to the ground state of the final nucleus and the 0nbb-decay NME. It indicates that heavy-ion double charge exchange experiments would be a useful tool to obtain the information on the 0nbb-decay NME.

20180710RIBFsemiPoster-256.pdf

ribf-seminar-shimizu-pub.pdf