Photoneutron cross sections for /sup 17/O

Journal Article · Fri Feb 01 04:00:00 EST 1980 · Phys. Rev., C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.21.503· OSTI ID:5728078

Jury, J W; Berman, B L; Faul, D D; Meyer, P; Woodworth, J G

Photoneutron cross sections involving the emission of one and two neutrons from /sup 17/O have been measured over the energy interval 8.5 to 39.7 MeV using monoenergetic photons from positron in-flight annihilation. The 6-MeV wide giant dipole resonance is observed to be centered at 23 MeV and a pygmy resonance is seen at about 13 MeV. Such structure as is apparent in the cross sections is not as pronounced as for the cases of /sup 16/O and /sup 18/O. Comparison of the total photoneutron cross section with recent ground-state data indicates that much of the pygmy resonance decays to the ground or first excited state of /sup 16/O, but that the giant dipole resonance decays mainly to highly excited states in the daughter. Excellent agreement is observed between the present results and a recent two-particle, one-hole shell-model calculation of the isospin-split giant dipole resonance states for this nucleus. New photoneutron cross-section results for /sup 16/O up to 39.7 MeV are reported as well.

• Research Organization: Lawrence Livermore Laboratory, University of California, Livermore, California 94550
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5728078
• Journal Information: Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 21:2; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
BARYONS
BASIC INTERACTIONS
CROSS SECTIONS
DIPOLE MOMENTS
DIRECT REACTIONS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FERMIONS
GIANT RESONANCE
HADRONS
INTERACTIONS
ISOSPIN
ISOTOPES
KNOCK-OUT REACTIONS
LIGHT NUCLEI
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 01-10
MEV RANGE 10-100
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
OXYGEN 16
OXYGEN 17
OXYGEN 17 TARGET
OXYGEN ISOTOPES
PARTICLE PROPERTIES
PHOTONEUTRONS
PHOTONUCLEAR REACTIONS
PHOTONUCLEONS
RESONANCE
SHELL MODELS
STABLE ISOTOPES
TARGETS
TOTAL CROSS SECTIONS