Production of neutron-rich isotopes in fission of uranium induced by neutrons of 20 MeV average energy
(2000) European Physical Journal A. Hadrons and Nuclei — Vol. 9, n° 3, p. 385-396 (2000)
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- In the context of a parameter study conducted by several laboratories for future European radioactive beam facilities based on fast-neutron induced fission, in particular for the SPIRAL-II project at GANIL. we have measured the yields of neutron-rich isotopes in the mass range of 88 to 144. These nuclei were obtained as fission products of natural uranium bombarded by neutrons of 20 MeV average energy emitted by a thick carbon target irradiated by 50 MeV deuterons. Yields have been measured using on-line mass separation with the ion-guide method. Compared with proton-induced fission at 25 MeV the magnitude of cross-sections, except for the symmetric region, is similar. Z-distributions of isobars have the same width: 0.7 charge units, but their maxima are shifted by about 0.8 charge units, favouring production of the neutron-richer isobars. Our data allow calculations of absolute cross-sections for fission of natural uranium induced by neutrons of about 20 MeV.
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Lhersonneau, G., Dendooven, P., Canchel, G., Huikari, J., Jardin, P., Jokinen, A., Kolhinen, V., Lau, C., Lebreton, L., Mueller, AC., Nieminen, A., Nummela, S., Penttila, H., Perajarvi, K., Radivojevic, Z., Rubchenya, V., Saint-Laurent, M., Trzaska, W. H., Vakhtin, D., et al. (2000). Production of neutron-rich isotopes in fission of uranium induced by neutrons of 20 MeV average energy. European Physical Journal A. Hadrons and Nuclei, 9(3), 385-396. https://doi.org/10.1007/s100500070023 (Original work published 2000)