High-resolution measurement of the ¹⁶O(γ,pn) reaction
(1996)- Abstract
- The 16O(gamma,pn) reaction has been measured with a resolution high enough to resolve individual low-lying states in the residual 14N nucleus. The relative population of the states provides detailed information about the quantum numbers of the proton-neutron pairs on which photons are absorbed. Partial cross-sections, available to the acceptance of the detector system, have been extracted for the individual states, and compared to a recent calculation based on absorption on one-pion exchange currents and the Delta-resonance current. The experiment was performed at the Maxlab accelerator laboratory in Lund, Sweden, using tagged photons at an energy of 67-76 MeV. The proton detector angular range was 60-100 degrees and the corresponding... (More)
- The 16O(gamma,pn) reaction has been measured with a resolution high enough to resolve individual low-lying states in the residual 14N nucleus. The relative population of the states provides detailed information about the quantum numbers of the proton-neutron pairs on which photons are absorbed. Partial cross-sections, available to the acceptance of the detector system, have been extracted for the individual states, and compared to a recent calculation based on absorption on one-pion exchange currents and the Delta-resonance current. The experiment was performed at the Maxlab accelerator laboratory in Lund, Sweden, using tagged photons at an energy of 67-76 MeV. The proton detector angular range was 60-100 degrees and the corresponding number for the neutron detector was 81-103 degrees. A missing-energy resolution of 1.5 MeV was obtained. The relative population of the states in the residual 14N nucleus indicates that the (gamma,pn) reaction takes place predominantly on proton-neutron pairs coupled to (J^pi,T) = (1^+,0), where J is the total angular momentum of the pair, pi is the parity and T is the isospin. The cross-section for absorption on (0^+,1) pairs is strongly suppressed. Furthermore, the relative population of the states indicates that both L=0 and L=2 pairs participate in the reaction, where L is the angular momentum of the center-of-mass of the pair. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/17776
- author
- Isaksson, Lennart LU
- supervisor
- opponent
-
- Skopik, Dennis, University of Saskatchewan, Canada
- organization
- publishing date
- 1996
- type
- Thesis
- publication status
- published
- subject
- keywords
- pn), E_gamma = 67-76 MeV, resolved states, cross-sections, Nuclear physics, Kärnfysik, Fysicumarkivet A:1996:Isaksson, 16O(gamma, Photonuclear reaction
- pages
- 123 pages
- publisher
- Nuclear Physics (Faculty of Technology)
- defense location
- Fysiska Institutionen, Föreläsningssal B
- defense date
- 1996-10-25 13:15:00
- external identifiers
-
- other:LUNFD6/(NFFR-1015)/1-123/(1996)
- ISBN
- 91-628-2178-4
- language
- English
- LU publication?
- yes
- id
- d5a011c4-c176-42cd-90fe-9ef19f326074 (old id 17776)
- date added to LUP
- 2016-04-04 10:57:51
- date last changed
- 2018-11-21 21:01:49
@phdthesis{d5a011c4-c176-42cd-90fe-9ef19f326074,
abstract = {{The 16O(gamma,pn) reaction has been measured with a resolution high enough to resolve individual low-lying states in the residual 14N nucleus. The relative population of the states provides detailed information about the quantum numbers of the proton-neutron pairs on which photons are absorbed. Partial cross-sections, available to the acceptance of the detector system, have been extracted for the individual states, and compared to a recent calculation based on absorption on one-pion exchange currents and the Delta-resonance current. The experiment was performed at the Maxlab accelerator laboratory in Lund, Sweden, using tagged photons at an energy of 67-76 MeV. The proton detector angular range was 60-100 degrees and the corresponding number for the neutron detector was 81-103 degrees. A missing-energy resolution of 1.5 MeV was obtained. The relative population of the states in the residual 14N nucleus indicates that the (gamma,pn) reaction takes place predominantly on proton-neutron pairs coupled to (J^pi,T) = (1^+,0), where J is the total angular momentum of the pair, pi is the parity and T is the isospin. The cross-section for absorption on (0^+,1) pairs is strongly suppressed. Furthermore, the relative population of the states indicates that both L=0 and L=2 pairs participate in the reaction, where L is the angular momentum of the center-of-mass of the pair.}},
author = {{Isaksson, Lennart}},
isbn = {{91-628-2178-4}},
keywords = {{pn); E_gamma = 67-76 MeV; resolved states; cross-sections; Nuclear physics; Kärnfysik; Fysicumarkivet A:1996:Isaksson; 16O(gamma; Photonuclear reaction}},
language = {{eng}},
publisher = {{Nuclear Physics (Faculty of Technology)}},
school = {{Lund University}},
title = {{High-resolution measurement of the ¹⁶O(γ,pn) reaction}},
year = {{1996}},
}