Elsevier

Nuclear Physics A

Volume 199, Issue 3, 22 January 1973, Pages 504-512
Nuclear Physics A

A subnanosecond and a nanosecond fission isomer in 238Pu

https://doi.org/10.1016/0375-9474(73)90593-9Get rights and content

Abstract

A subnanosecond fission isomer has been found in 238Pu by means of a new fission-inflight technique. An isomer with a longer half-life reported previously in the same nucleus has been detected simultaneously. The half-lives are 0.5 ± 0.2 ns and 5 ± 2 ns respectively. Excitation functions show that the two isomers are separated by 1.3 ± 0.3 MeV, the short-lived isomer having the lowest excitation energy. It is assigned as the ground state while the 5 ns state is interpreted as a quasiparticle state in the second potential well. The difference of 1.3 MeV in excitation energy defines within the uncertainty the neutron energy gap at the isomeric deformation.

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A brief report of this work has been given at the European Conference on Nuclear Physics, Aix-en-Provence, 1972, J. de Phys. Compt. Rend., vol. II, (1972).

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