H. Akimune

GT strengths studied by (3He, t) reactions and nuclear matrix elements for double beta decays

Abstract GT matrix elements M S ν for transitions of 100 Mo(0 + ) → 100 Tc(1 + ) and 116 Cd(0 + ) → 116 In(1 + ) were obtained by measuring ( 3 He, t) reactions on 100 Mo and 116 Cd, respectively. The values for M S ν , together with the GT matrix elements M S ′ ν for 100 Tc(1 + ) → 100 Ru(0 + ) and 116 In(1 + ) → 116 Sn( + ), are applied to estimate the nuclear matrix elements M SS ′ 2 ν for the two neutrino double beta decays (2νββ) of 100 Mo and 116 Cd through the 1 + ground states in the intermediate nuclei of 100 Tc and 116 In, respectively. They are very close to the observed 2νββ matrix elements M 2 ν , consistent with recent experimental and theoretical analyses.

Gamow-Teller strengths from (t,3He) charge-exchange reactions on light nuclei

Abstract Zero-degree cross sections have been measured for (t, 3 He) reactions on the light target nuclei 9 Be, 10 B, 11 B, 12 C, and 13 C at a bombarding energy of 127 MeV/A. The triton beam was produced by ( 4 He,t+p) breakup on a Be production target using a 4 He beam of 155 MeV/A. Dispersion matching was applied to obtain good energy resolution ( Δ E/E=0.002, Δ E=780 keV). The zero-degree (t, 3 He) cross sections are used to discuss Gamow-Teller strengths in 10 Be and 11 Be.

Isospin decomposition of the Gamow-Teller strength in Cu-58

Abstract The Gamow-Teller (GT) strength excited by a (p, n)-type reaction on a nucleus with isospin T0 and N > Z is shared by isospin components T0 − 1, T0 and T0 + 1. A good energy resolution (3He, t) reaction on 58Ni revealed the fine structure of the GT strength in 58Cu. The isospin of each level constituting the fine structure was assigned by comparing to results from inelastic electron and proton scatterings and (n, p)-type reactions, thus resolving the isospin structure of the GT strength in 58Cu. The ratio of the summed GT strengths among the three isospin components is well described by a shell-model calculation.

The (150)Nd((3)He,t) and (150)Sm(t,(3)He) reactions with applications to beta beta decay of (150)Nd

The

Charge-Exchange Reactions with a Secondary Triton Beam

^{150}

Spin-isospin resonances in nuclei

Nd(

Spin-isospin Responses of ^{71}Ga for Solar Neutrinos Studied by ^{71}Ga(^{3}He,t

^3

\gamma

He,

)^{71}Ge Reaction

t

Dipole Excitation of alpha Clusters in 6Li and 7Li

) reaction at 140 MeV/u and