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|Title:||Identificaition of the Shape Isomer in 235U|
|Authors:||OBERSTEDT ANDREAS; OBERSTEDT STEPHAN; GAWRYS M.; KORNILOV Nikolai|
|Citation:||PHYSICAL REVIEW LETTERS vol. 99 p. 042502-1 042502-4|
|Publisher:||AMERICAN PHYSICAL SOC|
|Type:||Articles in Journals|
|Abstract:||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 is the ideal instrument to perform an isomer search, when decay half-lives above 100 µs 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 T1/2 = (4.3 +3.0) ms. The corresponding cross-section was determined to sigma if = (10±8) µb. With these results a first experimental confirmation for the existence of a super-deformed shape isomer in odd-uranium isotopes is given for the first time.|
|JRC Institute:||Institute for Reference Materials and Measurements|
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