Spontaneous fission isomerism in uranium isotopes

Wolf, K. L. ; Vandenbosch, R. ; Russo, P. A. ; Mehta, Madhukar Kapilrai ; Rudy, C. R. (1970) Spontaneous fission isomerism in uranium isotopes Physical Review C, 1 (6). pp. 2096-2101. ISSN 0556-2813

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Official URL: http://prc.aps.org/abstract/PRC/v1/i6/p2096_1

Related URL: http://dx.doi.org/10.1103/PhysRevC.1.2096


A search for spontaneous fission isomerism in uranium and neptunium isotopes has resulted in the identification of a new isomer in 238U with a half-life of 195 ± 30 nsec. A measurement of the half-life of previously reported 236mU gives a value of 105 ± 20 nsec. Excitation functions have been determined for the production of the spontaneous fission isomers of 236U and 238U by deuteron bombardment of 236U and 238U targets. Isomer ratios have also been estimated. The low values of the isomer ratios and the failure to observe delayed fission in lighter uranium isotopes and in neptunium isotopes suggest that γ decay may be the dominant mode of decay of shape isomers in this mass region.

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