Light particles in coincidence with evaporation residues and heavy fragments have been measured by a 4pi charged-particle detector at the INFN Laboratori Nazionali di Legnaro (Padua) for the 240 MeV S-32+Mo-100 reaction leading to the Ce-132 composite system at 152 MeV of excitation energy. Energy spectra of the alpha-particles in coincidence with fission fragments were extracted for many correlation angles both in plane and out of plane. A prominent out-of-plane emission was observed, consistent with the pattern for the near-scission emission. From the fit to the spectra, the pre-scission alpha-particle multiplicity of 0.040 +/- 0.006 was obtained. This value is reproduced by the code PACE2 without the inclusion of a delay time for fission. The presence of fast fission, which could be responsible for this result, is discussed.
Search for dynamical effects in the fission decay in the 240 MeV S-32+Mo-100 reaction / G. La Rana; A. Brondi; R. Moro; E. Vardaci; A. Ordine; A. Boiano; M.A. Di Meo; A. Scherillo; D. Fabris; M. Lunardon; G. Nebbia; G. Viesti; M. Cinausero; E. Fioretto; G. Prete; N. Gelli; F. Lucarelli. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - STAMPA. - 16:(2003), pp. 199-207. [10.1140/epja/i2002-10091-y]
Search for dynamical effects in the fission decay in the 240 MeV S-32+Mo-100 reaction
LUCARELLI, FRANCO
2003
Abstract
Light particles in coincidence with evaporation residues and heavy fragments have been measured by a 4pi charged-particle detector at the INFN Laboratori Nazionali di Legnaro (Padua) for the 240 MeV S-32+Mo-100 reaction leading to the Ce-132 composite system at 152 MeV of excitation energy. Energy spectra of the alpha-particles in coincidence with fission fragments were extracted for many correlation angles both in plane and out of plane. A prominent out-of-plane emission was observed, consistent with the pattern for the near-scission emission. From the fit to the spectra, the pre-scission alpha-particle multiplicity of 0.040 +/- 0.006 was obtained. This value is reproduced by the code PACE2 without the inclusion of a delay time for fission. The presence of fast fission, which could be responsible for this result, is discussed.File | Dimensione | Formato | |
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Search for dynamical effects in the fission decay in the 240 MeV S-32+Mo-100 reaction.pdf
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