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Emil Beták, Renata Mikolajczak, Joanna Staniszewska, Stefan Mikolajewski, Edward Rurarz

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

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, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 93, 06/2005
Pages: 311 - 326

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