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Giant dipole resonance in {sup 17}O observed with the ({gamma},p) reaction

Technical Report:

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>>
Authors:
Zubanov, D; Thompson, M N; [1]  Berman, B L; [2]  Jury, J W; [3]  Pywell, R E; [4]  McNeill, K G [5] 
  1. Melbourne Univ., Parkville (Australia). School of Physics
  2. George Washington Univ., Washington, DC (United States). Dept. of Physics
  3. Trent Univ., Peterborough, ON (Canada). Dept. of Physics
  4. Saskatchewan Univ., Saskatoon, SK (Canada). Saskatchewan Accelerator Lab.
  5. Toronto Univ., ON (Canada). Dept. of Physics
Publication Date:
Dec 01, 1991
Product Type:
Technical Report
Report Number:
UM-P-91/84
Reference Number:
SCA: 663410; PA: AIX-23:006180; SN: 91000616187
Resource Relation:
Other Information: PBD: [1991]
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; OXYGEN 17 TARGET; GIANT RESONANCE; M1-TRANSITIONS; PHOTONUCLEAR REACTIONS; PARTICLE-HOLE MODEL; CARBON 13; COMPARATIVE EVALUATIONS; EXCITED STATES; EXPERIMENTAL DATA; INTEGRAL CROSS SECTIONS; ISOSPIN; MEV RANGE 10-100; NITROGEN 16; OXYGEN 16; OXYGEN 18; PHOTONEUTRONS; PHOTOPROTONS; SHELL MODELS; TOTAL CROSS SECTIONS; 663410; PHOTONUCLEAR REACTIONS AND PHOTON SCATTERING
OSTI ID:
10102620
Research Organizations:
Melbourne Univ., Parkville, VIC (Australia). School of Physics
Country of Origin:
Australia
Language:
English
Other Identifying Numbers:
Other: ON: DE92612142; CNN: Contract W-7405-ENG-48; TRN: AU9112343006180
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
INIS
Size:
62 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}