Abstract
The decay properties of low lying collective states in {sup 132}Ba were studied by means of {gamma}-spectroscopy following the {beta}-decay of the 2{sup -}-ground state (T{sub 1/2}=4.8 h) and a 6{sup -}-isomer (T{sub 1/2}=24.3 min) of {sup 132}La. The lanthanum nuclei were produced at the Cologne FN TANDEM accelerator using the reaction {sup 122}Sn({sup 14}N,4n){sup 132}La. The {gamma}{gamma} coincidences and singles spectra were measured with the OSIRIS-cube spectrometer. Beside ground and quasi-gamma band many other low lying states were observed. The {gamma}{gamma} angular correlations were analyzed to assign spins to the excited states, and to determine the multipolarities of the depopulating the {gamma}-transitions. We also confirmed the expected dominant E2 character of transitions in the quasi-gamma band and from the quasi-gamma to the ground band but with a certain deviation: The decay 6{sub 2}{sup +}{yields}6{sub 1}{sup +} shows an unexpected large M1 fraction. Also the decays of the third, fourth and fifth 2{sup +} states are dominated by M1 radiation. A level at 1660 keV could be identified as the 0{sub 3}{sup +} state in {sup 132}Ba. The experimental data are compared with calculations using the Proton-Neutron Interacting Boson Model (IBM-2). Good agreement is reached in the vicinity of the
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Gade, A;
Gelberg, A;
Brentano, P von;
[1]
Wiedenhoever, I;
[2]
Shimizu, N;
Otsuka, T;
[3]
Mizusaki, T;
[4]
Honma, M
[5]
- Institute for Nuclear Physics, University of Cologne, Zuelpicher Str. 77, 50937 Cologne (Germany)
- NSCL, Michigan State University, East Lansing, Michigan 48824 (United States)
- Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)
- Department of Law, Senshu University, Kanagawa 214-8580 (Japan)
- Center for Mathematical Science, University of Aizu, Fukushima 965-8580 (Japan)
Citation Formats
Gade, A, Gelberg, A, Brentano, P von, Wiedenhoever, I, Shimizu, N, Otsuka, T, Mizusaki, T, and Honma, M.
Low lying collective states in {sup 132}Ba.
United States: N. p.,
2002.
Web.
doi:10.1063/1.1470036.
Gade, A, Gelberg, A, Brentano, P von, Wiedenhoever, I, Shimizu, N, Otsuka, T, Mizusaki, T, & Honma, M.
Low lying collective states in {sup 132}Ba.
United States.
https://doi.org/10.1063/1.1470036
Gade, A, Gelberg, A, Brentano, P von, Wiedenhoever, I, Shimizu, N, Otsuka, T, Mizusaki, T, and Honma, M.
2002.
"Low lying collective states in {sup 132}Ba."
United States.
https://doi.org/10.1063/1.1470036.
@misc{etde_20618954,
title = {Low lying collective states in {sup 132}Ba}
author = {Gade, A, Gelberg, A, Brentano, P von, Wiedenhoever, I, Shimizu, N, Otsuka, T, Mizusaki, T, and Honma, M}
abstractNote = {The decay properties of low lying collective states in {sup 132}Ba were studied by means of {gamma}-spectroscopy following the {beta}-decay of the 2{sup -}-ground state (T{sub 1/2}=4.8 h) and a 6{sup -}-isomer (T{sub 1/2}=24.3 min) of {sup 132}La. The lanthanum nuclei were produced at the Cologne FN TANDEM accelerator using the reaction {sup 122}Sn({sup 14}N,4n){sup 132}La. The {gamma}{gamma} coincidences and singles spectra were measured with the OSIRIS-cube spectrometer. Beside ground and quasi-gamma band many other low lying states were observed. The {gamma}{gamma} angular correlations were analyzed to assign spins to the excited states, and to determine the multipolarities of the depopulating the {gamma}-transitions. We also confirmed the expected dominant E2 character of transitions in the quasi-gamma band and from the quasi-gamma to the ground band but with a certain deviation: The decay 6{sub 2}{sup +}{yields}6{sub 1}{sup +} shows an unexpected large M1 fraction. Also the decays of the third, fourth and fifth 2{sup +} states are dominated by M1 radiation. A level at 1660 keV could be identified as the 0{sub 3}{sup +} state in {sup 132}Ba. The experimental data are compared with calculations using the Proton-Neutron Interacting Boson Model (IBM-2). Good agreement is reached in the vicinity of the O(6) limit. The data for the ground band and the gamma band agree rather well with large scale Monte Carlo shell model calculations.}
doi = {10.1063/1.1470036}
journal = []
issue = {1}
volume = {610}
journal type = {AC}
place = {United States}
year = {2002}
month = {Apr}
}
title = {Low lying collective states in {sup 132}Ba}
author = {Gade, A, Gelberg, A, Brentano, P von, Wiedenhoever, I, Shimizu, N, Otsuka, T, Mizusaki, T, and Honma, M}
abstractNote = {The decay properties of low lying collective states in {sup 132}Ba were studied by means of {gamma}-spectroscopy following the {beta}-decay of the 2{sup -}-ground state (T{sub 1/2}=4.8 h) and a 6{sup -}-isomer (T{sub 1/2}=24.3 min) of {sup 132}La. The lanthanum nuclei were produced at the Cologne FN TANDEM accelerator using the reaction {sup 122}Sn({sup 14}N,4n){sup 132}La. The {gamma}{gamma} coincidences and singles spectra were measured with the OSIRIS-cube spectrometer. Beside ground and quasi-gamma band many other low lying states were observed. The {gamma}{gamma} angular correlations were analyzed to assign spins to the excited states, and to determine the multipolarities of the depopulating the {gamma}-transitions. We also confirmed the expected dominant E2 character of transitions in the quasi-gamma band and from the quasi-gamma to the ground band but with a certain deviation: The decay 6{sub 2}{sup +}{yields}6{sub 1}{sup +} shows an unexpected large M1 fraction. Also the decays of the third, fourth and fifth 2{sup +} states are dominated by M1 radiation. A level at 1660 keV could be identified as the 0{sub 3}{sup +} state in {sup 132}Ba. The experimental data are compared with calculations using the Proton-Neutron Interacting Boson Model (IBM-2). Good agreement is reached in the vicinity of the O(6) limit. The data for the ground band and the gamma band agree rather well with large scale Monte Carlo shell model calculations.}
doi = {10.1063/1.1470036}
journal = []
issue = {1}
volume = {610}
journal type = {AC}
place = {United States}
year = {2002}
month = {Apr}
}