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Abstract

In a high-energy-resolution measurement of gamma-rays from neutron capture in 238U five hitherto unknown gamma-transitions could be found exclusively in the gamma-ray spectra of s-wave neutron sub-threshold fission resonances around 720 eV. Since it is generally believed that the strongest fission resonance in this cluster at a neutron energy E(n) = 721.6 eV is a nearly pure class-II state, these transitions might be the first experimental observation of gamma-decay populating the shape-isomeric ground state in 239U. This assumption is supported by a quantitative analysis of the relative peak areas of each individual gamma-transition amongst these fission resonances, which show a strong correlation with the respective class-II admixture into the observed neutron resonance.

Additional information

Authors: OBERSTEDT S, SCK/CEN, Mol (BE);GUNSING F, JRC Geel (BE)
Bibliographic Reference: Article: Nuclear Physics A, Vol. 589 (1995) pp. 435-444
Record Number: 199511424 / Last updated on: 1995-11-03
Category: PUBLICATION
Original language: en
Available languages: en