The⁹³Nb(n,xp) Reaction atE_n= 14.6 MeV

Optical potential for incident and emitted low-energy $α$ particles. III. Non-statistical processes induced by neutrons on Zr, Nb, and Mo nuclei

“…Thus it becomes possible a description of both the absorption and emission of α particles by the same potential [1], in support of also its use for large-scale nuclear-data evaluations as TALYS corresponding default option. This conclusion had already been reachable within the previous analysis for Zr [5] and Mo [13] before DR and like-GQR decay consideration, due to outstanding cross-section measurements for 91 Zr(n, nα) 87 Sr m [98] and 95 Mo(n, α) 92 Zr [100,101] reactions. At the same time it is suggested that the simple OMP [10] could include, beyond the CN contribution, the additional ones that only now receive full consideration.…”

“…14(b)] stands as a fine case of the same nucleus in a different reaction channel and α-particle energy range. The activation of 87 Sr in neutron-induced reactions on 91 nucleus, through (n,αn) reaction is more than 10 times larger in comparison with that by (n, n ′ α) reaction, at incident energies of 15-21 MeV. Thus, the suitable agreement of measured [98] and calculated cross-sections of this reaction, in the absence of DR effects, has supported the α-particle OMP [1] once more.…”

“…The same residual-nucleus levels have been considered within the analysis of both the α-particle angular distributions of the one-nucleon pickup reactions ( 3 He, α) or (t, α), and the present (n, α) pickup excitation functions. As a result, the most consistent DR component corresponds to the 43 levels of 87 Sr residual nucleus up to ∼6 MeV excitation energy, which is important for calculating the 90 Zr(n, α) 87 Sr spectrum in Fig. 13(a).…”

“…6. A number of 43 levels up to ∼6 MeV excitation energy of 87 Sr residual nucleus has been considered in this respect, as well as for calculation of 90 Zr(n, α) 87 Sr pickup excitation function. The spectator proton pair picked from 2p 1 2 subshell [64,65] has been considered.…”

“…11: (Color online) As Fig. 3, of calculated cross-sections in this work (solid curves), but for (a-c) the (n, γ), (n, 2n), and (n, xp) reactions on 93 Nb, and (d) 14.5 MeV neutron-induced proton spectrum [84][85][86][87][88] with (n, p) (short-dotted) and (n, n ′ p) (dotted) CN, and PE (dashed) components.…”