Ground state photoneutron angular distributions in the giant resonance of 16O
Abstract
Photoneutron spectra for transitions to the ground state in the giant resonance of 16O were measured with high neutron energy resolution (ΔE ~ 60 keV) at angles of 50, 66, 82, 98, 114, 130, and 146 degrees relative to the direction of the incident bremsstrahlung beam. The spectra at the various angles were measured during successive experimental runs using a single 50 m time-of-flight spectrometer. The different angles were obtained by bending the electron beam relative to the direction of the flight path. Angular normalization was achieved by using a fast neutron monitor located at the end of a short flight path which was always normal to the reaction plane. Legendre coefficients for the angular distributions were extracted as functions of the excitation energy. From the energy dependence of the coefficients, interference effects are evident in the ground state (γ,n) cross section in the region from 17 to 30 MeV.
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Published In
Canadian Journal of Physics
Volume 48 • Number 14 • July 1970
Pages: 1635 - 1648
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Version of record online: 11 February 2011
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J. W. Jury, J. S. Hewitt, and K. G. McNeill. 1970. Ground state photoneutron angular distributions in the giant resonance of 16O. Canadian Journal of Physics.
48(14): 1635-1648. https://doi.org/10.1139/p70-207
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Cited by
1. New Measurements of Photoneutron Spectra investigating specific signatures of Carbon, Nitrogen, and Oxygen
2. Measurement of the angular correlations for the
16O(e,e′n)15O
reaction in the giant resonance region
3. Differential polarization of photoneutrons from
16
O
4. A study of M1, E1 and E2 strengths in
16
O below 25 MeV
5. Photoneutron studies of the giant isovector quadrupole resonance in calcium, cadmium, and lead
6. Electric quadrupole strength in
O16
from the
N15
(p→,
γ0
)
16
O reaction reaction
7. Photon scattering in the giant dipole resonance region of
O16
8. Forward-to-backward asymmetry of the (
γ
,n) reaction in the energy range 20
–
30 MeV
9. The giant dipole resonance in light nuclei and related phenomena
10. Ground state photoneutron reactions in
O17
11. Photonuclear reaction cross sections for 12C, 14N and 16O
12. Electric quadrupole photoneutron reactions in
O16
13. Photoneutron cross section for
O16
14. Energy spectra of secondary neutrons produced by high-energy bremsstrahlung in carbon, nitrogen, oxygen and tissue
15. Ground-state photoneutron angular distribution for 14N
16. Evidence for the isovector giant quadrupole resonance in
O16
from the
O16
(
γ
,
n0
)
O15
reaction
17. Angular distributions of γ-rays from fast neutron capture in strontium and yttrium
18. Giant
E1
resonance in
O16
observed with the reaction
N15(p,γ0)O16
19. 16
O(γ,n)
15
O angular distribution above the giant resonance region
20. Photonuclear reactions above the giant dipole resonance : A survey
21. Polarization Effects in Giant Electric Dipole and Quadrupole Resonances
22. Fore-Aft Anisotropy in the Radiative Capture of 14-MeV Neutrons
23. Time-of-flight spectroscopy of charged particles from photodisintegration of nuclei
24. Angular distribution and polarization of
O16(γ,n0)O15
25. Isoscalar electric quadrupole strength in
O16
26. Cryogenic target for a 2H(γ, n) photon spectrometer
27. 2H(γ, p) absolute cross section and angular distribution at 17–25 MeV
28. Evidence for a Giant Quadrupole Resonance in Oxygen-16
29. Intermediate Structure and the Photodisintegration of
O16
30. Evidence of
E2
and
M1
Transitions in High-Energy Photonuclear Reactions in
O16
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