Abstract
In-beam {gamma}-ray spectroscopy has been used to study rapidly rotating nuclei in the rare-earth region. The experiments were performed using the high-resolution multi detector arrays ESSA30 and TESSA3 at the Nuclear Structure Facility, Daresbury Laboratories in Great Britain and the NORDBALL at the Niels Bohr Tandem Accelerator at Risoe in Denmark. The studied nuclei were produced using heavy-ion induced fusion-evaporation reactions. New techniques for the analysis of {gamma}-{gamma} correlation spectra were developed. These involves viewing the two-dimensional {gamma}-{gamma} spectrum as well as projection in both energy axes, determination of centroids and volumes of peaks and full two-dimensional Gauss fits of an arbitrarily shaped area. The data acquisition system of the NORDBALL multi detector array is presented. In two of the studied nuclei ({sup 167}Lu and {sup 163}Tm) the strongly shape driving {pi}h{sub 9/2}[541]1/2{sup -} is studied. The shift to larger frequency of the neutron AB crossing in these decay sequences is not fully understood. The study of {sup 171}Re revealed a second backbend of the [402]5/2{sup +} band. The observed bandcrossings are interpreted using the CSM and three-band mixing calculations. The study of {sup 171,172}W revealed five new bands and although these nuclei are expected to be stably deformed the
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Citation Formats
Bergstroem, M H.
High spin gamma-ray coincidence spectroscopy with large detector arrays.
Sweden: N. p.,
1992.
Web.
Bergstroem, M H.
High spin gamma-ray coincidence spectroscopy with large detector arrays.
Sweden.
Bergstroem, M H.
1992.
"High spin gamma-ray coincidence spectroscopy with large detector arrays."
Sweden.
@misc{etde_10135687,
title = {High spin gamma-ray coincidence spectroscopy with large detector arrays}
author = {Bergstroem, M H}
abstractNote = {In-beam {gamma}-ray spectroscopy has been used to study rapidly rotating nuclei in the rare-earth region. The experiments were performed using the high-resolution multi detector arrays ESSA30 and TESSA3 at the Nuclear Structure Facility, Daresbury Laboratories in Great Britain and the NORDBALL at the Niels Bohr Tandem Accelerator at Risoe in Denmark. The studied nuclei were produced using heavy-ion induced fusion-evaporation reactions. New techniques for the analysis of {gamma}-{gamma} correlation spectra were developed. These involves viewing the two-dimensional {gamma}-{gamma} spectrum as well as projection in both energy axes, determination of centroids and volumes of peaks and full two-dimensional Gauss fits of an arbitrarily shaped area. The data acquisition system of the NORDBALL multi detector array is presented. In two of the studied nuclei ({sup 167}Lu and {sup 163}Tm) the strongly shape driving {pi}h{sub 9/2}[541]1/2{sup -} is studied. The shift to larger frequency of the neutron AB crossing in these decay sequences is not fully understood. The study of {sup 171}Re revealed a second backbend of the [402]5/2{sup +} band. The observed bandcrossings are interpreted using the CSM and three-band mixing calculations. The study of {sup 171,172}W revealed five new bands and although these nuclei are expected to be stably deformed the small differences in the formation showed to be crucial in order to reproduce data well. (au).}
place = {Sweden}
year = {1992}
month = {Dec}
}
title = {High spin gamma-ray coincidence spectroscopy with large detector arrays}
author = {Bergstroem, M H}
abstractNote = {In-beam {gamma}-ray spectroscopy has been used to study rapidly rotating nuclei in the rare-earth region. The experiments were performed using the high-resolution multi detector arrays ESSA30 and TESSA3 at the Nuclear Structure Facility, Daresbury Laboratories in Great Britain and the NORDBALL at the Niels Bohr Tandem Accelerator at Risoe in Denmark. The studied nuclei were produced using heavy-ion induced fusion-evaporation reactions. New techniques for the analysis of {gamma}-{gamma} correlation spectra were developed. These involves viewing the two-dimensional {gamma}-{gamma} spectrum as well as projection in both energy axes, determination of centroids and volumes of peaks and full two-dimensional Gauss fits of an arbitrarily shaped area. The data acquisition system of the NORDBALL multi detector array is presented. In two of the studied nuclei ({sup 167}Lu and {sup 163}Tm) the strongly shape driving {pi}h{sub 9/2}[541]1/2{sup -} is studied. The shift to larger frequency of the neutron AB crossing in these decay sequences is not fully understood. The study of {sup 171}Re revealed a second backbend of the [402]5/2{sup +} band. The observed bandcrossings are interpreted using the CSM and three-band mixing calculations. The study of {sup 171,172}W revealed five new bands and although these nuclei are expected to be stably deformed the small differences in the formation showed to be crucial in order to reproduce data well. (au).}
place = {Sweden}
year = {1992}
month = {Dec}
}