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High-resolution mea...
High-resolution measurement of the ¹⁶O(γ,pn) reaction
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- Isaksson, Lennart (författare)
- Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory
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(creator_code:org_t)
- ISBN 9162821784
- 1996
- Engelska 123 s.
- Relaterad länk:
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https://lup.lub.lu.s...
Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
Nyckelord
- pn)
- E_gamma = 67-76 MeV
- resolved states
- cross-sections
- Nuclear physics
- Kärnfysik
- Fysicumarkivet A:1996:Isaksson
- 16O(gamma
- Photonuclear reaction
Publikations- och innehållstyp
- dok (ämneskategori)
- vet (ämneskategori)
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