The (3He, n) reaction on even (f, p) shell nuclei at 15, 18 and 21 MeV (II)

An experimental view on shape coexistence in nuclei

“…The states at 3531 keV (0 + 3 ) in 58 Ni, 3319 keV (0 + 3 ) in 60 Ni, and 3519 keV (0 + 4 ) in 62 Ni were observed to be populated strongly in the two-proton-transfer ( 3 He,n) reactions [136][137][138] or the ( 6 Li,d) or ( 16 O, 12 C) α-particle transfer reactions, and were identified as the T = 1, T = 2, and T = 3 proton pairing vibration states [136,139]. What is remarkable is that the 0 + 3 states in 58,60 Ni have very strong E0 transitions to the ground state, with 10 3 × ρ 2 (E0) values of 80 (30) and 77 +66…”

“…For 60 Ni, the two-protontransfer strength of 150% is attributed to the 3588-keV 0 + 4 state in Refs. [136,137], and to the 3318-keV 0 + 3 state in Ref. [138].…”

“…Data are taken from the National Nuclear Data Center database [39] and Refs. [102,140,141] (E0), [139] ( 6 Li,d), and [127,[136][137][138] ( 3 He,n). observed in the Zn isotopes, was interpreted as reflecting a strong polarization of the Z = 28 core [147].…”

“…The values, in bold, under the 0 + states are the population strengths, expressed in percent, relative to the ground state for the ( 6 Li,d) reactions (red, left) and the ( 3 He,n) reactions (blue, right). For60 Ni, the two-protontransfer strength of 150% is attributed to the 3588-keV 0 + 4 state in Refs [136,137],. and to the 3318-keV 0 + 3 state in Ref [138]…”

In beam gamma spectroscopy of62Zn

“…The neutron deficient 62Zn nucleus has previously been studied by various transfert reactions: (160, 12C) [1], (p, t) [2][3][4][5], (3He, n) [6,7] and (6Li, d) [8] reactions, and J~ assignments up to 4 + have been deduced principally from the DWBA analysis of the (p, t) angular distributions. A few decay 7-rays were also known from the 63Cu(p, 2n7) reaction [4] (assigned from the relative pattern of the excitation function).…”