MEDEX'19

Session

Session (Chair: F. Simkovic)

May 28, 2019, 9:00 AM

Balling Hall (ground floor) (The Czech National Library of Technology)

48. Nuclear Physics of Non-Standard Neutrinoless Double Beta Decay

Dr Jenni Kotila (University of Jyväskylä)

5/28/19, 9:00 AM

Oral Presentation

In spite of several attempts by many groups (for review see e.g. [1]), neutrinoless double beta ($0\nu\beta\beta$) decay has not yet been observed. Nonetheless, this observation remains crucial for understanding lepton number violation. After the discovery of neutrino oscillations [2], attention has been mostly focused on the mass mechanism of $0\nu\beta\beta$, wherein the three species of...

53. Efficient QRPA calculation for two-neutrino double-beta decay nuclear matrix element

Dr Nobuo Hinohara (Center for Computational Sciences, University of Tsukuba)

5/28/19, 9:30 AM

Oral Presentation

The quasiparticle random-phase approximation (QRPA) is used to evaluate the double-beta decay nuclear matrix element. In the QRPA, the isoscalar neutron-proton pairing is known to suppress the nuclear matrix element, and thus its strength has to be determined using available experimental data. The conventional solution of the QRPA equation is based on the diagonalization of the QRPA matrix in...

47. Experimental studies of axial-vector weak couplings for double beta decays by nuclear and muon reactions

Prof. Hiro Ejiri (RCNP Osaka University)

5/28/19, 10:00 AM

Oral Presentation

We report experimental studies of nuclear matrix elements (NME) for astro-neutrinos and double beta decays(DBDs) by nuclear and muon charge exchange reactions. The axial-vector NMEs for various multipolarities for both $\tau ^+$ and $\tau ^-$ sides in wide energy and momentum regions, which are relevant to sypernova and DBDs, are reduced with respect to pnQRPA MNEs. They are discussed in terms...