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Identification of a Shape Isomer in 235U
Örebro University, Department of Natural Sciences. (Subatomär fysik)
2007 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 4, p. 1-4Article in journal (Refereed) Published
Abstract [en]

The shape isomer in 235U has been searched for in a neutron-induced fission experiment on 234U, which was performed at the isomer spectrometer NEPTUNE of the EC-JRC IRMM. A neutron source, with a tunable pulse frequency in the Hz to kHz range and its individually adjustable neutron pulse width in connection with an appropriate detector system turned out to be the ideal instrument to perform an isomer search, when decay half-lives above 100 us are expected. From the delayed fission events observed for two different NEPTUNE settings and at mean incident neutron energies En = 0.95 and 1.27 MeV the isomeric fission half-life could be determined to be T_1/2 = (3.6 ± 1.8) ms. The corresponding cross section was determined to sigma_if = (10 ± 8) ub. With these results an experimental confirmation for the existence of a superdeformed shape isomer in odd-uranium isotopes is given for the first time.

Place, publisher, year, edition, pages
The American Physical Society , 2007. Vol. 99, no 4, p. 1-4
Keywords [en]
235U(n, f), Shape isomer, Neutron-induced reaction, Fission barrier
National Category
Subatomic Physics Natural Sciences Physical Sciences
Research subject
Physics
Identifiers
URN: urn:nbn:se:oru:diva-4082DOI: 10.1103/PhysRevLett.99.042502OAI: oai:DiVA.org:oru-4082DiVA, id: diva2:138381
Note
Artikelnummer: 042502Available from: 2007-10-30 Created: 2007-10-30 Last updated: 2017-12-14Bibliographically approved

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Oberstedt, Andreas

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