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Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf

Abstract

This thesis is devoted to the study of the nuclear structure of neutron-rich nuclei, via the search of isomeric nuclear states. Neutron-rich nuclei were produced in the spontaneous fission of {sup 252}Cf. The experimental study of isomeric states in these nuclei was performed with the {gamma}-array EUROGAM II, coupled to an additional and original fission fragment detector composed by photovoltaic cells, SAPhIR. The photovoltaic cells are well adapted to detect low energy heavy ions and have good energy and time resolutions to obtain a good fission fragment detection. This experiment led to the discovery of new isomeric states in {sup 135}Xe, {sup 104}Mo, {sup 146,147,148}Ce and {sup 152,154,156}Nd, with lifetimes between 60 ns and 2 {mu}s. Level schemes of these nuclei have been completed. An interpretation of the isomeric states in the nuclei {sup 154,156}Nd and {sup 156,158}Sm was performed by Hartree-Fock-Bogolyubov calculations using the DIS Gogny force with two quasi-particles excitations. The confrontation with the experimental results led to an interpretation of these isomeric states as K-isomers. (author)
Authors:
Publication Date:
Sep 01, 1997
Product Type:
Technical Report
Report Number:
CEA-DAPNIA-SPhN-97-02T
Reference Number:
EDB-00:108627
Resource Relation:
Other Information: 80 refs; PBD: Sep 1997
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CALIFORNIUM 252; CERIUM 146; CERIUM 147; CERIUM 148; FISSION FRAGMENT DETECTION; FISSION FRAGMENTS; FISSION ISOMERS; GAMMA DETECTION; GE SEMICONDUCTOR DETECTORS; HARTREE-FOCK-BOGOLYUBOV THEORY; ISOMERIC NUCLEI; ISOMERIC TRANSITIONS; MOLYBDENUM 104; NEODYMIUM 152; NEODYMIUM 154; NEODYMIUM 156; PHOTOVOLTAIC CELLS; SAMARIUM 156; SAMARIUM 158; SPONTANEOUS FISSION; XENON 135
OSTI ID:
20056651
Research Organizations:
CEA Centre d'Etudes de Saclay, 91 - Gif-sur-Yvette (France). Dept. d'Astrophysique, de la Physique des Particules, de la Physique Nucleaire et de l'Instrumentation Associee
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR9803409017434
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
184 pages
Announcement Date:

Citation Formats

Gautherin, C. Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf. France: N. p., 1997. Web.
Gautherin, C. Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf. France.
Gautherin, C. 1997. "Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf." France.
@misc{etde_20056651,
title = {Nuclear isomerism in fission fragments produced by the spontaneous fission of {sup 252}Cf; Isomerisme nucleaire dans les fragments de fission produits dans la fission spontanee du {sup 252}Cf}
author = {Gautherin, C}
abstractNote = {This thesis is devoted to the study of the nuclear structure of neutron-rich nuclei, via the search of isomeric nuclear states. Neutron-rich nuclei were produced in the spontaneous fission of {sup 252}Cf. The experimental study of isomeric states in these nuclei was performed with the {gamma}-array EUROGAM II, coupled to an additional and original fission fragment detector composed by photovoltaic cells, SAPhIR. The photovoltaic cells are well adapted to detect low energy heavy ions and have good energy and time resolutions to obtain a good fission fragment detection. This experiment led to the discovery of new isomeric states in {sup 135}Xe, {sup 104}Mo, {sup 146,147,148}Ce and {sup 152,154,156}Nd, with lifetimes between 60 ns and 2 {mu}s. Level schemes of these nuclei have been completed. An interpretation of the isomeric states in the nuclei {sup 154,156}Nd and {sup 156,158}Sm was performed by Hartree-Fock-Bogolyubov calculations using the DIS Gogny force with two quasi-particles excitations. The confrontation with the experimental results led to an interpretation of these isomeric states as K-isomers. (author)}
place = {France}
year = {1997}
month = {Sep}
}