γ-Decay towards the shape-isomeric ground state of 239U

S. Oberstedt; F. Gunsing

doi:10.1016/0375-9474(95)00081-B

γ-Decay towards the shape-isomeric ground state of ²³⁹U

S. Oberstedt, F. Gunsing

Research output › peer-review

Abstract

In a high-energy-resolution measurement of γ-rays from neutron capture in ²³⁸U five hitherto unknown γ-transitions could be found exclusively in the γ-ray spectra of s-wave neutron subthreshold 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 γ-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 γ-transition amongst these fission resonances, which show a strong correlation with the respective class-II admixture into the observed neutron resonance.

Original language	English
Pages (from-to)	435-444
Number of pages	10
Journal	Nuclear Physics, Section A
Volume	589
Issue number	3
DOIs	https://doi.org/10.1016/0375-9474(95)00081-B
State	Published - 10 Jul 1995

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/0375-9474(95)00081-B

Cite this

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title = "γ-Decay towards the shape-isomeric ground state of 239U",

abstract = "In a high-energy-resolution measurement of γ-rays from neutron capture in 238U five hitherto unknown γ-transitions could be found exclusively in the γ-ray spectra of s-wave neutron subthreshold fission resonances around 720 eV. Since it is generally believed that the strongest fission resonance in this cluster at a neutron energy En = 721.6 eV is a nearly pure class-II state, these transitions might be the first experimental observation of γ-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 γ-transition amongst these fission resonances, which show a strong correlation with the respective class-II admixture into the observed neutron resonance.",

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N2 - In a high-energy-resolution measurement of γ-rays from neutron capture in 238U five hitherto unknown γ-transitions could be found exclusively in the γ-ray spectra of s-wave neutron subthreshold fission resonances around 720 eV. Since it is generally believed that the strongest fission resonance in this cluster at a neutron energy En = 721.6 eV is a nearly pure class-II state, these transitions might be the first experimental observation of γ-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 γ-transition amongst these fission resonances, which show a strong correlation with the respective class-II admixture into the observed neutron resonance.

AB - In a high-energy-resolution measurement of γ-rays from neutron capture in 238U five hitherto unknown γ-transitions could be found exclusively in the γ-ray spectra of s-wave neutron subthreshold fission resonances around 720 eV. Since it is generally believed that the strongest fission resonance in this cluster at a neutron energy En = 721.6 eV is a nearly pure class-II state, these transitions might be the first experimental observation of γ-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 γ-transition amongst these fission resonances, which show a strong correlation with the respective class-II admixture into the observed neutron resonance.

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