Evaporation and fission decay of 132Ce compound nuclei at Ex=122 MeV: some limitations of the statistical model View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2011-06-30

AUTHORS

A. Di Nitto, E. Vardaci, A. Brondi, G. La Rana, R. Moro, P. N. Nadtochy, M. Trotta, A. Ordine, A. Boiano, M. Cinausero, E. Fioretto, G. Prete, V. Rizzi, D. V. Shetty, M. Barbui, D. Fabris, M. Lunardon, G. Montagnoli, S. Moretto, G. Viesti, N. Gelli, F. Lucarelli, G. N. Knyazheva, E. M. Kozulin

ABSTRACT

Light charged particle (LCP) emission in the evaporation residue (ER) and fusion fission (FF) channels have been studied for the 200 MeV 32S + 100Mo reaction, leading to 132Ce composite nuclei at Ex=122 MeV. The main goal was to study the decay of 132 Ce on the basis of an extended set of observables, to get insights on the fission dynamics. The proton and alpha particle energy spectra, their multiplicities, ER-LCP angular correlations, ER and FF angular distributions, and ER and FF cross-sections were measured. The measured observables were compared with the Statistical Model (SM). Using standard parameters, the model was able to reproduce only the pre-scission multiplicities and the FF and ER cross-sections. The calculation was observed to strongly overestimate the proton and alpha particle multiplicities in the ER channel. Disagreements were also observed for the ER-LCP correlations, the LCP energy spectra and the ER angular distribution. By varying the SM input parameters over a wide range of values, it is shown that it is not possible to reproduce all the observables simultaneously with a unique set of parameters. The inadequacy of the model in reproducing the ER particle multiplicities is also observed analysing data from the literature for other systems in the A ≈ 150 and Ex ≈ 100−200 MeV region. These results indicate serious limitations about the use of the SM in extracting information on fission dynamics. More... »

PAGES

83

Identifiers

URI

http://scigraph.springernature.com/pub.10.1140/epja/i2011-11083-6

DOI

http://dx.doi.org/10.1140/epja/i2011-11083-6

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042855258


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    "description": "Light charged particle (LCP) emission in the evaporation residue (ER) and fusion fission (FF) channels have been studied for the 200 MeV 32S + 100Mo reaction, leading to 132Ce composite nuclei at Ex=122 MeV. The main goal was to study the decay of 132 Ce on the basis of an extended set of observables, to get insights on the fission dynamics. The proton and alpha particle energy spectra, their multiplicities, ER-LCP angular correlations, ER and FF angular distributions, and ER and FF cross-sections were measured. The measured observables were compared with the Statistical Model (SM). Using standard parameters, the model was able to reproduce only the pre-scission multiplicities and the FF and ER cross-sections. The calculation was observed to strongly overestimate the proton and alpha particle multiplicities in the ER channel. Disagreements were also observed for the ER-LCP correlations, the LCP energy spectra and the ER angular distribution. By varying the SM input parameters over a wide range of values, it is shown that it is not possible to reproduce all the observables simultaneously with a unique set of parameters. The inadequacy of the model in reproducing the ER particle multiplicities is also observed analysing data from the literature for other systems in the A \u2248 150 and Ex \u2248 100\u2212200 MeV region. These results indicate serious limitations about the use of the SM in extracting information on fission dynamics.", 
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