Activation cross sections for reactions induced by 14 MeV neutrons on natural tin and enriched Sn-112 targets with reference to In-111 production via radioisotope generator Sn-112(n, 2n)Sn-111 -> In-111

摘要

We measured activation cross sections via gamma-ray spectroscopy using high-purity germanium detectors for 16 reactions induced by (14.4 +/- 0.2)MeV neutrons on isotopes of tin. The cross sections are:sigma( Sn-112 (n, 2n)Sn-111) = (1104 +/- 43) mb, sigma(Sn-112 (n, p) In-112m) (33.6 +/- 2.1) mb, sigma(Sn-112(n, p)In-112g) (42.7 +/- 3.1) mb, sigma(Sn-114 (n,2n) Sn-113) (1270 +/- 115) mb, sigma(Sn-114 (n, p)(114m2) In) = (20.5 +/- 1.1) mb, sigma(Sn-115(n, p)In-115m) = (35.2 +/- 2.6) mb, sigma(Sn-116(n, P) (116m2) In) (11.1 +/- 0.5) mb, sigma(Sn-117(n, np) (116m2) In) = (1.35 +/- 0.11) mb, sigma(117 Sn (n, P) 117m In) = (4.5 +/- 0.4) mb, sigma ((117) Sn (n, p) In-117) = (12.8 +/- 0.7) mb, sigma(117 Sn (n, n') (117)m, Sn) (246 +/- 2 1) mb, sigma(Sn-118 (n, 2n) (117)m Sn) (816 +/- 70) mb, sigma(Sn-118(n, alpha)Cd-115g) = (1.26 +/- 0.16) mb, sigma(Sn-120 (n, alpha) Cd-117m) (0.27 +/- 0.04) mb, sigma(Sn-120(n, alpha) (117)gCd) (0.29 +/- 0.06) mb and sigma (Sn-124 (n, 2n) Sn-123m) = (590 +/- 26) mb.Two Sn-112 targets enriched to 62.5% and 84%, respectively, were used for these measurements in addition to the natural tin. The cross sections were compared with experimental data found in the literature, with published empirical formulae and with model calculations including also the pre-equilibrium contribution. For reactions which do not involve protons from below the closed Z = 50 shell, the agreement to the data is reasonable, it is somewhat weaker for the (n, p) reactions and still worse in the case of (n, a), where, however, the pre-equilibrium component is not described properly by the models included so far. The possibility of production of Sn-111 -> In-111 generator system is considered.