The reactions 68, 70Zn(3He, d)69, 71Ga and level systematics of the odd-mass Ga isotopes

Coulomb excitation ofGa73

“…Considering recent laser spectroscopy data, the ground-state spin was found to be 1/2 − while transfer reactions gave evidence for a 3/2 − state close to the ground state. No evidence for a doublet near the ground state of 73 Ga was obtained from the transfer reaction studies [4][5][6][7][8][9].…”

“…The level structure at low excitation energy of the former is characterized by two groups of levels. One consists of the 3/2 − ground state along with a 1/2 − and 5/2 − level at low excitation energy, which are all strongly populated in one-proton-transfer reactions on zinc isotopes, suggesting a πpf single-particle character [5,9]. The second group of levels comprises a 1/2 − , 3/2 − , 5/2 − , and 7/2 − multiplet, situated around an energy of 1 MeV, and can originate mainly from the πp 3/2 ⊗ 2 + (Zn) core-coupling scheme.…”

“…The structure of the neutron-rich odd-A gallium isotopes (Z = 31) has been studied in the past by means of β decay [1][2][3], single-and multiparticle transfer reactions [4][5][6][7][8][9], and more recently by deep inelastic reactions [10]. The twoneutron-transfer reaction data suggest a change in structure between 71 Ga 40 and 73 Ga 42 , which is most probably related to the structural difference observed between 72 Ge 40 and 74 Ge 42 (Z = 32), where both the 72 Ge 40 (t,p) 74 Ge 42 and 74 Ge 42 (p,t) 72 Ge 40 reactions strongly populate the excited 0 + state, indicating a shape transition [11].…”

Coulomb excitation of 73Ga

“…The structure of the neutron rich odd-A gallium isotopes (Z = 31) has been studied in the past by means of β decay [1][2][3], single and multi-particle transfer reactions [4][5][6][7][8][9] and more recently by deep inelastic reactions [10]. The two neutron transfer reaction data suggest a change in structure between 71 Ga 40 and 73 Ga 42 , which is most probably related to the structural difference observed between 72 Ge 40 and 74 Ge 42 (Z = 32), where both the 72 Ge 40 (t,p) 74 Ge 42 and 74 Ge 42 (p,t) 72 Ge 40 reactions strongly populate the excited 0 + state, indicating a shape transition [11].…”

“…From the energy systematics, there seems to be a more general structural difference between the odd-A gallium isotopes up to 69 Ga 38 and those with 40 neutrons or more (see figure 1). The level structure at low excitation energy of the former is characterized by 2 groups of levels: one consists of the 3/2 − ground state along with a 1/2 − and 5/2 − level at low excitation energy, which are all strongly populated in one proton transfer reactions on zinc isotopes, suggesting a πpf single-particle character [5,9]. The second group of levels comprises a 1/2 − ,3/2 − ,5/2 − and 7/2 − multiplet, situated around an energy of 1 MeV and can originate mainly from the πp 3/2 ⊗2 + (Zn) core-coupling scheme.…”