Abstract
The giant dipole resonance (GDR) in {sup 17}O has been studied with the reaction {sup 17}O({gamma},p) {sup 16}N from E{sub {gamma}}=13.50 to 43.15 MeV using quasi-monoenergetic photons. The measured cross section shows a major peaks at 15.1, 18.1, 19.3, 20.3, 22.2, 23.1, 24.4, and {approx}26.5 MeV. The intermediate structure in the main GDR region is similar to the observed in {sup 16}O, indicating that the valence neutron outside the doubly magic {sup 16}O core perturbs the core-excited states minimally, in support of the weak coupling hypothesis. The trends in GDR structure of {sup 16},{sup 17},{sup 18}O were correlated with changes in ground state properties related to static deformation. The ({gamma},p) reaction selects strength predominantly from 2p-1h configurations formed via E1 transitions from the 1p{sub 1/2} subshell; comparison with other reactions (photoneutron and radiative capture) has provided information on the microscopic structure of E1 states, showing that M1 transitions contribute to the measured strength. The total adsorption cross section was estimated and comparison with particle-hole shell-model calculations indicated that the main cross-section features, including isospin distribution, are well predicted. Evidence is found for isospin splitting in {sup 17}O. Systematics of the integrated cross sections for the carbon, nitrogen, and oxygen isotopes
More>>
Zubanov, D;
Thompson, M N;
[1]
Berman, B L;
[2]
Jury, J W;
[3]
Pywell, R E;
[4]
McNeill, K G
[5]
- Melbourne Univ., Parkville (Australia). School of Physics
- George Washington Univ., Washington, DC (United States). Dept. of Physics
- Trent Univ., Peterborough, ON (Canada). Dept. of Physics
- Saskatchewan Univ., Saskatoon, SK (Canada). Saskatchewan Accelerator Lab.
- Toronto Univ., ON (Canada). Dept. of Physics
Citation Formats
Zubanov, D, Thompson, M N, Berman, B L, Jury, J W, Pywell, R E, and McNeill, K G.
Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction.
Australia: N. p.,
1991.
Web.
Zubanov, D, Thompson, M N, Berman, B L, Jury, J W, Pywell, R E, & McNeill, K G.
Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction.
Australia.
Zubanov, D, Thompson, M N, Berman, B L, Jury, J W, Pywell, R E, and McNeill, K G.
1991.
"Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction."
Australia.
@misc{etde_10102620,
title = {Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction}
author = {Zubanov, D, Thompson, M N, Berman, B L, Jury, J W, Pywell, R E, and McNeill, K G}
abstractNote = {The giant dipole resonance (GDR) in {sup 17}O has been studied with the reaction {sup 17}O({gamma},p) {sup 16}N from E{sub {gamma}}=13.50 to 43.15 MeV using quasi-monoenergetic photons. The measured cross section shows a major peaks at 15.1, 18.1, 19.3, 20.3, 22.2, 23.1, 24.4, and {approx}26.5 MeV. The intermediate structure in the main GDR region is similar to the observed in {sup 16}O, indicating that the valence neutron outside the doubly magic {sup 16}O core perturbs the core-excited states minimally, in support of the weak coupling hypothesis. The trends in GDR structure of {sup 16},{sup 17},{sup 18}O were correlated with changes in ground state properties related to static deformation. The ({gamma},p) reaction selects strength predominantly from 2p-1h configurations formed via E1 transitions from the 1p{sub 1/2} subshell; comparison with other reactions (photoneutron and radiative capture) has provided information on the microscopic structure of E1 states, showing that M1 transitions contribute to the measured strength. The total adsorption cross section was estimated and comparison with particle-hole shell-model calculations indicated that the main cross-section features, including isospin distribution, are well predicted. Evidence is found for isospin splitting in {sup 17}O. Systematics of the integrated cross sections for the carbon, nitrogen, and oxygen isotopes are discussed. 75 refs., 4 tabs., 10 figs.}
place = {Australia}
year = {1991}
month = {Dec}
}
title = {Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction}
author = {Zubanov, D, Thompson, M N, Berman, B L, Jury, J W, Pywell, R E, and McNeill, K G}
abstractNote = {The giant dipole resonance (GDR) in {sup 17}O has been studied with the reaction {sup 17}O({gamma},p) {sup 16}N from E{sub {gamma}}=13.50 to 43.15 MeV using quasi-monoenergetic photons. The measured cross section shows a major peaks at 15.1, 18.1, 19.3, 20.3, 22.2, 23.1, 24.4, and {approx}26.5 MeV. The intermediate structure in the main GDR region is similar to the observed in {sup 16}O, indicating that the valence neutron outside the doubly magic {sup 16}O core perturbs the core-excited states minimally, in support of the weak coupling hypothesis. The trends in GDR structure of {sup 16},{sup 17},{sup 18}O were correlated with changes in ground state properties related to static deformation. The ({gamma},p) reaction selects strength predominantly from 2p-1h configurations formed via E1 transitions from the 1p{sub 1/2} subshell; comparison with other reactions (photoneutron and radiative capture) has provided information on the microscopic structure of E1 states, showing that M1 transitions contribute to the measured strength. The total adsorption cross section was estimated and comparison with particle-hole shell-model calculations indicated that the main cross-section features, including isospin distribution, are well predicted. Evidence is found for isospin splitting in {sup 17}O. Systematics of the integrated cross sections for the carbon, nitrogen, and oxygen isotopes are discussed. 75 refs., 4 tabs., 10 figs.}
place = {Australia}
year = {1991}
month = {Dec}
}