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Abstract

Activation cross section for the reaction natV(n,xa)47Sc have been measured for four incident energies between 13.8 and 19.5 MeV at the IRMM 7 MV Van de Graaff accelerator. The measured cross sections are essentially unique outside the energy range of 14.4-14.8 MeV. Large discrepancies are observed with the ENDF/B-VI, EAF-97 and EAF-99 evaluations. A much improved description results from new model calculations for the 50V(n,a)47Sc and 51V(n,n'a)47Sc that were performed with a modified version of the model-code Stapre-H95. It is now evident that the contribution of the (n,a) reaction dominates below 15 MeV, whereas the (n,n'a) reaction dominates above 16 MeV. Measurements from 8-12 MeV are in progress at INC, FZ-Julich, and complementary data will be obtained between 14-16 and 20 MeV at IRMM. The reactions 99Tc(n,p)99Mo and 99Tc(n,a)96Nb have been studied with the activation technique between 8.5 and 12.3 MeV at the Julich Compact Cyclotron and between 17 and 20 MeV at the IRMM 7 MV Van de Graaff accelerator. The new measured data complement measurements at 14 Mev and allow the first construction of an excitation curve for these reactions. A comparison to the JEF-2.2 and JENDL-Activation libraries shows that a reasonable description is obtained for the (n,p) reaction using JENDL but that otherwise discrepancies are large. To obtain a consistent description of both reaction channels with parameters appropriate for this mass range, new model calculations with the Stapre code are ongoing.

Additional information

Authors: REIMER P, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);PLOMPEN A J M, European Commission, Joint Research Centre, Institute for Reference Materials and Measurements, Geel (BE);AVRIGEANU V, Forschungszentrum Julich, Institut f�r Nuklearchemie, Julich (DE);QAIM S M, "Horia Hulubei" National Institute for Physics and Nuclear Engineering, Bucharest (RO);SUDAR S, University of Debrecen, Faculty of Science, Institute of Experimental Physics, Debrecen (HU)
Bibliographic Reference: Paper presented: VIII International Seminar on Interaction of Neutrons with Nuclei (RU) May 17-20, 2000
Availability: Available from Joint Institute for Nuclear Research, Dubna (RU)
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