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Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics
Farget F., Caamano M., Delaune O., B. Tarasov O., Derkx X. et al
in Journal of Physics: Conference Series - The 11th International Conference on Nucleus-Nucleus Collisions, San Antonio : United States (2012) - http://hal.in2p3.fr/in2p3-00703163
Physique/Physique Nucléaire Expérimentale
Isotopic fission fragment distributions as a deep probe to fusion-fission dynamics
F. Farget1, M. Caamano, O. Delaune1, O. B. Tarasov, X. Derkx1, K.-H. Schmidt2, A. M. Amthor, L. Audouin3, C.-O. Bacri3, G. Barreau2, B. Bastin1, D. Bazin, B. Blank2, J. Benlliure, L. Caceres1, E. Casarejos, A. Chbihi1, B. Fernandez-Dominguez, L. Gaudefroy4, C. Golabek1, S. Grévy1, B. Jurado2, O. Kamalou1, A. Lemasson1, S. Lukyanov, W. Mittig, D. J. Morrissey, A. Navin1, J. Pereira, L. Perrot3, M. Rejmund1, T. Roger1, M.-G. Saint-Laurent1, H. Savajols1, C. Schmitt1, B.M. Sherill, C. Stodel1, J. Taieb4, J.-C. Thomas1, A.C. Villari1
1 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
2 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
http://www.cenbg.in2p3.fr/
CNRS : UMR5797 – IN2P3 – Université Sciences et Technologies - Bordeaux I
Chemin du Solarium - BP 120 - 33175 Gradignan Cedex
France
3 :  IPNO - Institut de Physique Nucléaire d'Orsay
http://ipnweb.in2p3.fr
CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud
IPN - 15, rue Georges Clemenceau - 91406 ORSAY CEDEX
France
4 :  DAM/DIF - DAM Île-de-France
http://www-dam.cea.fr/
CEA : DAM/DIF
CEA Bruyères-le-Châtel 91297 Arpajon cedex
France
Structure nucléaire
NEX
ACEN
During the fission process, the atomic nucleus deforms and elongates up to the two fragments inception and their final separation at the scission deformation. The evolution of the nucleus energy with deformation defines a potential energy landscape in the multidimensional deformation space. It is determined by the macroscopic properties of the nucleus, and is also strongly influenced by the single-particle structure of the nucleus, which modifies the macroscopic energy minima. The fission fragment distribution is a direct consequence of the deformation path the nucleus has encountered, and therefore is the most genuine experimental observation of the potential energy landscape of the deforming nucleus. Very asymmetric fusion-fission reactions at energy close to the Coulomb barrier, produce well-defined conditions of the compound nucleus formation, where processes such as quasi-fission, pre-equilibrium emission and incomplete fusion are negligible. In the same time, the excitation energy is sufficient to reduce significantly structural effects, and mostly the macroscopic part of the potential is responsible for the formation of the fission fragments. We use inverse kinematics combined with a spectrometer to select and identify the fission fragments produced in 238U+12C at a bombarding energy close to and well-above the Coulomb barrier. For the first time, the isotopic yields are measured over the complete atomic-number distribution, between Z=30 and Z=63. In the experimental set-up, it is also possible to identify transfer-induced reactions, which lead to low-energy fission

Communications avec actes
2013
01/06/2012
Journal of Physics: Conference Series
internationale
420
012119

The 11th International Conference on Nucleus-Nucleus Collisions
San Antonio
États-Unis
27/05/2012
01/06/2012
F. Farget

GANIL 2013-036 A
Expérience GANIL E516, E547
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1209.0816