Excitation functions of 109Ag(n,2n)108mAg, 151Eu(n,2n)150mEu and 159Tb(n,2n)158Tb reactions from threshold to 15 MeV
✍ Scribed by S.M. Qaim; F. Cserpák; J. Csikai
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 395 KB
- Volume
- 47
- Category
- Article
- ISSN
- 0969-8043
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✦ Synopsis
Cross-sections were measured for the formation of long-lived products ~°SmAg(~ = 433y), Js°mEu(T½ = 36.9y) and 15STb(~ = 180y) in (n,2n) reactions on z°gAg, 151Eu and 15gTb, respectively, over the neutron energy range of 10.8-12.2 MeV. In the case of silver the target material consisted of 99.26% enriched 1°gAg. The l°9Ag(n,2n)l°SmAg reaction cross-section was also measured at 14.5 MeV using silver of natural isotopic composition. All measurements were done using the activation technique in combination with high resolution ),-ray spectrometry. A re-normalization of our previous results in the 8.7-10.7 MeV energy region for the lSlEu(n,2n)lS°mEu and 15gTb(n,2n)mSSTb reactions was done. The experimental data were compared with results of nuclear model calculations based on compound-precompound theory. Except for some small deviations in the energy region below l0 MeV, the experimental and theoretical data for the 151Eu(n,2n)lS°mEu and t59Tb(n,2n)lSSTb reactions agree. In the case of t°gAg(n,2n)l°SmAg reaction, good agreement is found between experiment and theory over the whole investigated energy range.
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The cross-sections for formation of isomeric pair, 75 Ge m (σ m ) and 75 Ge g (σ g ), through 76 Ge(n, 2n), 75 As(n, p) and 78 Se(n, α) reactions were measured at 13.73 MeV, 14.42 MeV and 14.77 MeV neutrons and also estimated using EMPIRE-II and TALYS codes over neutron energies from near threshold