The (³He,d) Reaction on ⁶⁹Ga

Abstract

Excited levels of 70Ge and proton holes in 69Ga have been investigated by means of the 69Ga (3He, d)70Ge reaction at an incident beam energy of 22.5 MeV. Angular distributions were measured and are compared with the prediction of the distorted-wave-Born-approximation (DWBA) theory in order to obtain the spectroscopic strengths of each level.The number of proton holes in 69Ga was obtained from the sum rule of the spectroscopic strengths. The vacancy probability UJ2 and the center of gravity energy EJ for the 2p3/2, 1f5/2, and 2p1/2 subshells are[Formula: see text]These are compared with the pairing model calculations.

Multiple band structures in Ge70

“…Several low-spin negative-parity states in 70 Ge were identified from the earliest studies of this nucleus using light-projectile reactions [5][6][7][8][9]11], heavy-ion reactions [12,13], and a more recent investigation of the β + decay of 70 As [10]. The lowest state with negative parity was first identified as the one at 2562 keV [8] with a likely spin of J = 3 [6].…”

“…Low-lying excited 0 + states are common among the even-even Ge isotopes, and 70 Ge is no exception. The 0 + 2 state in 70 Ge has been known since the earliest studies of this nucleus [5][6][7][8][9], and was later confirmed using fusion-evaporation reactions [13]. Higher-lying 2 + 3 and 4 + 3 states were found to decay to the 0 + 2 state through a sequence of γ rays with energy 941.10 and 901.95 keV following the β + decay of 70 As [10], providing confirmation of the 4 + 3 state observed in Refs.…”

“…Although not considered a candidate for the exotic shapes mentioned above, the stable 70 Ge isotope shows a rich structure with interesting similarities and differences compared to its neighboring even-even isotopes. Several low-spin (J ≤ 6) studies were performed up to 5.1 MeV excitation energy using light-ion, transfer, and inelastic-scattering reactions [5][6][7][8][9]. Further insight into the low-spin structure was provided by a study of the β + decay of 70 As [10].…”