Identification of a Shape Isomer in U235

Details Identification of a Shape Isomer in U235 Identification of a Shape Isomer in U235

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phrvl..99d2502o&link_type=abstract

Physical Review Letters, vol. 99, Issue 4, id. 042502

Physics

1

Lifetimes, Alpha Decay, Neutron-Induced Fission, 220<=A

Scientific paper

The shape isomer in U235 has been searched for in a neutron-induced fission experiment on U234, 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 100μs 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 T1/2=(3.6±1.8)ms. The corresponding cross section was determined to σif=(10±8)μb. With these results an experimental confirmation for the existence of a superdeformed shape isomer in odd-uranium isotopes is given for the first time.

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