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 / LA RANA, Giovanni; Brondi, Augusto; Moro, RENATA EMILIA MARIA; Vardaci, Emanuele; 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. - A16:2(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
LA RANA, GIOVANNI;BRONDI, AUGUSTO;MORO, RENATA EMILIA MARIA;VARDACI, EMANUELE;
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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
