Nuclear reaction models for systematic analysis of the fast neutron induced (n,p) reaction cross sections
http://dx.doi.org/10.1051/ndata:07288 05/2008; DOI: 10.1051/ndata:07288
Taking into account compound, pre-equilibrium and direct reaction mechanisms, we suggest certain method for theoretical explanation of systematic regularity in the fast neutron induced (n,p) reaction cross sections. The statistical model, Griffin exciton model and PWBA are used. For systematical analysis of (n,p) reaction cross sections, simple and convenient formulae are deduced. It is shown that theoretical (n,p) cross sections are satisfactorily in agreement with experimental values for the 6, 8, 10, 13, 14.5, and 16 MeV neutrons.
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ABSTRACT: We measured activation cross sections via γ-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: σ( 112Sn(n, 2n)111Sn) = (1104 ± 43) mb, σ( 112Sn(n, p)112mIn) = (33.6 ± 2.1) mb, σ( 112Sn(n, p)112gIn) = (42.7 ± 3.1) mb, σ( 114Sn(n, 2n)113Sn) = (1270 ± 115) mb, σ( 114Sn(n, p)114m2In) = (20.5 ± 1.1) mb, σ(115Sn(n, p)115mIn) = (35.2 ± 2.6) mb, σ(116Sn(n, p)116m2In) = (11.1 ± 0.5) mb, σ(117Sn(n, np)116m2In) = (1.35 ± 0.11) mb, σ(117Sn(n, p)117mIn) = (4.5 ± 0.4) mb, σ(117Sn(n, p)117gIn) = (12.8 ± 0.7) mb, σ(117Sn(n, n′)117mSn) = (246 ± 21) mb, σ(118Sn(n, 2n)117mSn) = (816 ± 70) mb, σ(118Sn(n, α)115gCd) = (1.26 ± 0.16) mb, σ(120Sn(n, α)117mCd) = (0.27 ± 0.04) mb, σ(120Sn(n, α)117gCd) = (0.29 ± 0.06) mb and σ(124Sn(n, 2n)123mSn) = (590 ± 26) mb. Two 112Sn 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, α), where, however, the pre-equilibrium component is not described properly by the models included so far. The possibility of production of 111Sn → 111In generator system is considered.Radiochimica Acta 01/2005; 93(6):311-326. DOI:10.1524/ract.93.6.311.65644 · 1.01 Impact Factor
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