He particle emission in fast neutron induced reactions |
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Authors: | S. M. Qaim, C. H. Wu,R. W lfle |
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Affiliation: | Institut für Chemie 1 (Nuklearchemie), Kernforschungsanlage Jülich GmbH, D-5170, Jülich, Federal Republic of Germany |
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Abstract: | Cross sections for some (n, 3He + dp + n2p) and (n, + 2n2p + n3He + pt + dd + dnp) reactions induced by fast neutrons produced via breakup of 53 MeV deuterons on a Be target (En = 4–50 MeV; Imax at 22.5 MeV; FWHM = 15.8 MeV) were measured for isotopes of the elements I, La, Nd, Tb, Ho, Yb, W and Au by the activation technique using high-resolution γ-ray spectroscopy, wherever necessary chemical separation, and in several cases enriched isotopes as targets. Furthermore, 3He/ emission cross-section ratios were measured for Co, Ag, In, Cs, La, Ta, Au and Bi using a quadrupole mass spectrometer. The cross sections decrease as a function of increasing (N−Z)/A of the target nucleus. For target elements with Z 44, the 3He/ emission cross-section ratio increases with increasing Z; for elements with Z > 44, however, the trend is reversed. Hauser-Feshbach calculations suggest that the 3He/ emission cross-section ratios are not explainable by the statistical model. |
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Keywords: | Nuclear reactions |
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