Barriers for pion-induced fission near A = 208 |
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Authors: | S de Barros A G da Silva J C Suita R J Peterson |
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Institution: | 1. Instituto de Física, Universidada Federal do Rio de Janeiro, 21945-970, Rio de Janeiro, Brasil 2. Departamento de Física, Instituto de Engenharia Nuclear, 20001-2186, Rio de Janeiro, Brasil 3. Nuclear Physics Laboratory, University of Colorado, Boulder, CO, 80309-0446, USA
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Abstract: | Measured fission cross sections for π+ and π? beams of 150 MeV on isotopically separated targets near A=208 show a smooth dependence of the fission probability on the target mass, without any indication of the increased fission barriers expected for fission at low excitation near doubly magic 208Pb. Extraction of fission barriers from these data is attempted for a range of possible excitation energies, finding that these barriers are near 8 MeV near A=208, without much sensitivity to the assumed excitation energy. |
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