Spectroscopy of even tin isotopes by inelastic scattering of 24.5 MeV protons

Evidence of the spectator role of unpaired nucleons of the target nucleus in (p, ?) reactions

“…Basrak et al [17] in the 121Sb(t, c012~ reaction. However, the quite weak excitation of a few 2 neutron hole states of 12~ below ~3.72MeV (essentially the g.s., the 1.17MeV state and a group of unresolved states with centroid energy ~2.37MeV) which are strongly populated in two neutron pickup reactions [19] and inelastic scattering [20] indicates that the probability for the incident proton of picking-out the 2d5/z proton outside the magic shell together with 2 neutrons of the core is not vanishingly small as it appeared to be in the case, e.g., of the 2~ c~)2~ reaction. The effect evidenced in the three previous discussed reactions is not easily noticed -at 20 MeV incident proton energy -in the case of (p, c 0 reactions on Nd and Zr isotopes with one neutron in excess respectively, of the N = 82 and N = 50 shell.…”

Studies on the level schemes of66Zn,144Sm and120Sn using the (γ, γ′) reaction

“…[2]. The levels at energies 1 171.4 and 2356.0 keV are predicted by the calculations of Arvieu [16], quoted in Ref.…”

“…The levels at energies 1 171.4 and 2356.0 keV are predicted by the calculations of Arvieu [16], quoted in Ref. [2], but the existence of the 2172.9 keV level is not predicted by any of the models used.…”

“…The level schemes of 66Zn, 144Sm, and 12~ have been studied previously both by fl decay and by the (p,p') and (e, e') reactions [1][2][3][4][5][6][7].…”

Sn120homologous levels via the123Sb(

“…From the experimental point of view the level structure of 120 Sn nucleus has been extensively studied by means of different kinds of nuclear reactions, expecially those induced by light projectiles. In particular, the level scheme of 120 Sn has been investigated by means of inelastic scattering of protons [8,9], deuterons [10], 3 He and α [11,12], lithium ions [13,14], and by using the following one-, two-, and multinucleon transfer reactions 119 Sn(d, p) [15,16], 119 Sn(t, d) [17], 121 Sb (d, 3 He) [18], 121 Sb(t, α) [19], 122 Sn(p, t) [7,20], 118 Sn(t, p) [21], 123 Sb(p, α) measured with low energy resolution [22], and 124 Te(d, 6 Li) [23]. The most comprehensive information is obtained from γ -ray spectroscopy using the (n, γ ), (n, n'γ ), (γ, γ ), (P , P 'γ ) reactions [24][25][26][27] and Coulomb excitation [27,28] as well as from the study of the decay of 120 In [29][30][31][32] and 120 Sb [29,33,34].…”