Measurement of activation cross-sections of (n, np+d) reactions producing short-lived nuclei in the energy range between 13.4 and 14.9 MeV using an intense neutron source OKTAVIAN

Activation cross-sections for 17 (n. np + d) reactions producing short-live d nuclei with half-lives between 42 s and 23 min, were measured in the ener gy range between 13.4 and 14.9 MeV by an activation method. The measured ta rget isotopes were Mg-26, Si-29,Si- 30, Cr-53,Cr- 54, Zn-67, Sr-87, (98, 10 0) Mo, Ru-102, Pd-105. 106,Pd- 108, Te-123, Dy-163, Hf-179 and Os-189. Elev en cross-sections for Mg-26. Si-30 Sr-87, Mo-100, Ru-102. Pd-105,Pd- 106. T e-123, (163) Dy, Hf-179 and Os-189 were obtained for the first time, and fo ur cross-sections for Cr-53,Cr- 54, Zn-67 and Pd-108 were obtained at six-p oint energies for the first time. An intense 14 MeV neutron source, OKTAVIA N at Osaka University was used for irradiation. All cross-section values we re relatively obtained on the basis of the standard cross-section of Al-27( n, alpha)Na-24 reaction (ENDF/B-VI). To obtain reliable neutron activation cross-sections, careful attention was paid to neutron irradiation and induc ed activity measurement. The present results were compared with the evaluat ed data in JENDL-3.2, JENDL-Activation File and ENDF/B-VI. The cross-sectio ns are underestimated for Ru-102 and Pd-108 in JENDL-3.2. (C) 2001 Elsevier Science Ltd. All rights reserved.