First simultaneous measurement of fission and gamma probabilities of 237U and 239Np via surrogate reactions

P. Marini; Q. Ducasse; B. Jurado; M. Aiche; L. Mathieu; G. Barreau; S. Czajkowski; I. Tsekhanovich; A. Moro; J. Lei; F. Giacoppo; A. Gorgen; L. Audouin; L. Tassan-Got; J. N. Wilson; F. Gunsing; M. Guttormsen; A. C. Larsen; M. Lebois; T. Renstrom; S. Rose; S. Siem; G. M. Tveten; M. Wiedeking; O. Serot; G. Boutoux; V. Méot; B. Morillon; D. Denis-Petit; O. Roig; S. Oberstedt; A. Oberstedt

doi:10.1051/epjconf/201612212004

All issues

Volume 122 (2016)

EPJ Web of Conferences, 122 (2016) 12004

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 122, 2016 CNR*15 - 5^th International Workshop on Compound-Nuclear Reactions and Related Topics


Article Number		12004
Number of page(s)		7
Section		Surrogate Reactions
DOI		https://doi.org/10.1051/epjconf/201612212004
Published online		21 June 2016

EPJ Web of Conferences 122, 12004 (2016)
https://doi.org/10.1051/epjconf/201612212004

First simultaneous measurement of fission and gamma probabilities of ²³⁷U and ²³⁹Np via surrogate reactions

P. Marini¹^a, Q. Ducasse¹^,2, B. Jurado¹, M. Aiche¹, L. Mathieu¹, G. Barreau¹, S. Czajkowski¹, I. Tsekhanovich¹, A. Moro³, J. Lei³, F. Giacoppo⁴, A. Gorgen⁴, Tornyi⁴, L. Audouin⁵, L. Tassan-Got⁵, J. N. Wilson⁵, F. Gunsing⁶, M. Guttormsen⁴, A. C. Larsen⁴, M. Lebois⁵, T. Renstrom⁴, S. Rose⁴, S. Siem⁴, G. M. Tveten⁴, M. Wiedeking⁷, O. Serot⁸, G. Boutoux⁹, V. Méot⁹, B. Morillon⁹, D. Denis-Petit⁹, O. Roig⁹, S. Oberstedt¹⁰ and A. Oberstedt¹⁰

¹ CENBG, Chemin du Solarium B.P. 120, 33175 Gradignan, France
² CEA-Cadarache, DEN/DER/SPRC/LEPh, 13108 Saint Paul lez Durance, France
³ University of Seville, Seville, Spain
⁴ University of Oslo, Department of Physics, P.O. Box 1048, Blindern 0316 Oslo, Norway
⁵ IPN Orsay, 15 rue G. Clémenceau, 91406 Orsay cedex, France
⁶ CEA Saclay, DSM/Irfu, 91191 Gif-sur-Yvette cedex, France
⁷ iThemba LABS, P.O. Box 722, 7129 Somerset West, South Africa
⁸ CEA-Cadarache, DEN/DER/SPRC/LEPh, 13108 Saint Paul lez Durance, France
⁹ CEA DAM DIF, 91297 Arpajon, France
¹⁰ IRMM, Geel, Belgium

^a e-mail: marini@cenbg.in2p3.fr

Published online: 21 June 2016

Abstract

Fission and gamma decay probabilities of ²³⁷U and ²³⁹Np have been measured, for the first time simultaneously in dedicated experiments, via the surrogate reactions ²³⁸U(³He, ⁴He) and ²³⁸U(³He,d), respectively. While a good agreement between our data and neutron-induced data is found for fission probabilities, gamma decay probabilities are several times higher than the corresponding neutron-induced data for each studied nucleus. We study the role of the different spin distributions populated in the surrogate and neutron-induced reactions. The compound nucleus spin distribution populated in the surrogate reaction is extracted from the measured gamma-decay probabilities, and used as input parameter in the statistical model to predict fission probabilities to be compared to our data. A strong disagreement between our data and the prediction is obtained. Preliminary results from an additional dedicated experiment confirm the observed discrepancies, indicating the need of a better understanding of the formation and decay processes of the compound nucleus.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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