K. Miura

Proton single-particle states in [sup 21,23]Na through the ([ital d],[ital n]) reaction

Proton single-particle states in [sup 21,23]Na were studied through the ([ital d],[ital n]) reaction on [sup 20,22]Ne at [ital E][sub [ital d]]=25 MeV. Angular distributions of the emitted neutrons leading to the final states up to [ital E][sub [ital x]]=15 MeV were measured. Spectroscopic information has been obtained from an analysis with the adiabatic deuteron breakup approximation, where [ital s]-wave deuteron breakup effects have been included. Proton unbound transitions were analyzed by means of Vincent and Fortunes method. It was found that the observed proton single-particle states in [sup 21,23]Na exhausted almost all the strength for the 2[ital s]1[ital d] shell. The distributions of the 2[ital s]1[ital d] strength were reasonably reproduced by recent 2[ital s]1[ital d] shell model calculations. The occupation probabilities and single-particle energies of the proton orbits near Fermi levels in the ground states of [sup 20,22]Ne were deduced in a framework of combined analysis of the stripping and pickup data on the same target nucleus.

The 9Be(d, n)10B reaction at 25 MeV

Abstract Differential cross sections for the 9Be(d, n)10B reaction have been measured at Ed=25 MeV using the time-of-flight technique. Experimental angular distributions for the states below Ex=6.57 MeV were analysed with the distorted-wave theory including the S-wave deuteron-breakup effects in the adiabatic approximation. The extracted spectroscopic factors were compared with previous data. Coupled-reaction-channel (CRC) calculations were also performed, and significant improvements were seen for weakly excited states.

The 17,18O(p, n)17,18F reaction at Ep = 35 MeV

Abstract The 17,18 O(p, n) 17,18 F reactions were studied at E p = 35 MeV. Neutron spectra were measured at laboratory angles between 0° and 140°. Results were compared with distorted-wave calculations using the shell-model wave functions. For the 17 O(p, n) reaction, cross-section magnitudes as well as the angular-distribution shapes were well described by the calculation. On the other hand, normalization factors of 0.60 were required for the spin-flip excitations observed in the 18 O(p, n) reaction leading to the ground (1 + ), 1.700 MeV (1 + ) and 2.100 MeV (2 − ) states. Possible origins of such differences were discussed.

Gamow-Teller strengths near the ground states in A=110 – 120 nuclei studied by (p,n) reaction

Abstract An experimental study of the (p,n) reactions on 110, 112, 114, 116Cd and 116, 118, 120Sn has been carried out. The GT type ΔJπ=1+ transitions leading to the ground states or to those close to g. s.. have been systematically observed in addition to the ΔJπ = 0+ isobaric analog transitions. By testing proportionality relationship between the (p,n) cross section andthe corresponding β-decay rate, previously unknown GT matrix elements have been obtained.

The h11/2 States in 90Y Observed from the Excitation Functions for the (d, p) Reaction

Unambiguous l n =5 assignments have been made for the 1.96–2.24 MeV doublet in 90 Y from the l n -dependence of the excitation function for the 89 Y(d, p) 90 Y reaction over the range E d =3.3-4.6 MeV at θ=150°. It is concluded that these two excited states are the 5 + and 6 + states of the (2p 1/2 -1 , 1h 11/2 ) configuration. The present l n assignments are found to be little affected by the ambiguity of optical model parameters.