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

Study ofPb206by means of theBiGadioli1, Guazzoni2, Jaskóła3 et al. 1993Phys. Rev. CSelf Cite9010View full textAdd to dashboardCite

“…Therefore a great advantage is gained if, for some reasons, also for odd-mass target nuclei only one l and j dominates a given transition amplitude. It was suggested previously [2] that this behavior can be observed for a number of transitions induced on near-magic target nuclei having one proton outside a completely filled magic shell, e.g. , for a nucleus such as Bi.…”

“…Bi, previously carried out with an unpolarized proton beam, has shown that these nuclei are most suitable to investigate this effect' [2]. We now have studied the Pb (p, a) Tl and Bi(p, a) Pb reactions at 22 MeV incident energy in a high-resolution experiment.…”

Nucleon-alpha reactions in nuclei

“…Some results indicate that this part of the spectrum is sensitive to the structure of the nuclei involved in the process. This is shown, for instance, by comparison of the a-particle spectra in the (p, a) reactions induced on 90Zr and 91Zr at about 25 MeV proton energy (Gadioli et al 1983). In spite of the widely different Q values, the spectrum of alphas from 91Zr, as a function of a-particle channel energy, looks like an energy average of the more structured spectrum from 90Zr (figure 15).…”

“…They also suggest that most probably a given SM state can only be excited by a particular process so that interference between one-step and multi-step amplitudes also need not be considered. In applying this theory to (p, 'a) reactions (see also Tamura et a1 1981, Dragun et al 1981, Gadioli and Gadioli Erba 1982 suppose that the reaction mechanism for a one-step process is triton pick-up. The procedure they follow is the same discussed in 53.1.…”

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].…”