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High-resolution measurement of the ¹⁶O(γ,pn) reaction

Isaksson, Lennart LU (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)
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author
opponent
  • Skopik, Dennis, University of Saskatchewan, Canada
organization
publishing date
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
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
2007-05-24 10:30:16
date last changed
2016-09-19 08:45:07
@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},
  keyword      = {pn),E_gamma = 67-76 MeV,resolved states,cross-sections,Nuclear physics,Kärnfysik,Fysicumarkivet A:1996:Isaksson,16O(gamma,Photonuclear reaction},
  language     = {eng},
  pages        = {123},
  publisher    = {Nuclear Physics (Faculty of Technology)},
  school       = {Lund University},
  title        = {High-resolution measurement of the ¹⁶O(γ,pn) reaction},
  year         = {1996},
}