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Journal articles
Probing fission time scales with neutrons and GDR gamma rays
R.P. Schmitt
T. Botting
G.G. Chubarian
K.L. Wolf
B.J. Hurst
H. Jabs
M. Hamelin
A. Bacak
Yu.Ts. Oganessian
M.G. Itkis
E.M. Kozulin
N.A. Kondratiev
V.S. Salamatin
I.V. Pokrovsky
F. Hanappe
E. de Goes Brennand
A. Huck
L. Stuttge
E. Liatard
1
J. Beene
R. Varner
M. Halbert
N. Gan
1
LPSC - Laboratoire de Physique Subatomique et de Cosmologie (53 avenue des Martyrs - 38026 Grenoble Cedex - France)
- Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology (46 avenue Félix Viallet 38031 Grenoble Cedex 1 - France)
- Institut Polytechnique de Grenoble - Grenoble Institute of Technology (France)
- IN2P3 - Institut National de Physique Nucléaire et de Physique des Particules du CNRS (France)
- UJF - Université Joseph Fourier - Grenoble 1 (BP 53 - 38041 Grenoble Cedex 9 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5821 (France)
Abstract : The time scales for nuclear fission have been explored using both pre- and postfission neutrons and GDR gamma rays. Four systems were investigated: 133-MeV /sup 16/O+/sup 176/Yb and /sup 208/Pb and 104-MeV /sup 4/He+/sup 188/Os and /sup 209/Bi. Fission fragments were measured in coincidence with PPACs. The neutrons were detected using eight detectors from the DEMON array, while gamma rays were measured using the US BaF/sub 2/ array. The pre- and postfission gamma rays were determined using moving source fits parallel and perpendicular to the fission fragment emission directions. The time scales for fission for the neutrons were determined using the neutron clock technique. The gamma-ray data were fitted using a statistical model calculation based on the code CASCADE. The results of the fits from both data types were used to extract nuclear friction coefficients, gamma , and fission time scales. The gamma values ranged from 7 to 20, while the fission times were (31-105)*10/sup -21/s.
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http://hal.in2p3.fr/in2p3-00021981
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Submitted on : Tuesday, June 29, 2004 - 9:32:19 AM
Last modification on : Monday, December 20, 2021 - 10:20:47 AM
Contributor : Lpsc Bibliotheque Connect in order to contact the contributor
Submitted on : Tuesday, June 29, 2004 - 9:32:19 AM
Last modification on : Monday, December 20, 2021 - 10:20:47 AM
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- HAL Id : in2p3-00021981, version 1
- DOI : 10.1134/1.1586431
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R.P. Schmitt, T. Botting, G.G. Chubarian, K.L. Wolf, B.J. Hurst, et al.. Probing fission time scales with neutrons and GDR gamma rays. Physics of Atomic Nuclei / Yadernaya Fizika, MAIK Nauka/Interperiodica, 2003, 66, pp.1163-1167. ⟨10.1134/1.1586431⟩. ⟨in2p3-00021981⟩
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