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Title: Measurement of the Se 80 ( γ , n ) reaction with linearly polarized γ rays

Journal Article · · Physical Review C
 [1];  [1]; ORCiD logo [1];  [1];  [1];  [2]
  1. Duke Univ., Durham, NC (United States)
  2. Ohio Univ., Athens, OH (United States)
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This paper reports the results of the first measurements of the differential cross section of the 80Se(γ , n) 79Se reaction with a linearly polarized gamma-ray (γ-ray) beam. The cross section was measured at three incident γ-ray beam energies: 15.6, 15.8, and 16.0 MeV, with a beam energy spread of 3.0% full width at half-maximum (FWHM). The differential cross section for the excitation spectrum in 79Se was measured at two scattering angles in the plane of the beam polarization: θ = 90° and 135°, and at one angle in the plane perpendicular to the plane of polarization: θ = 90°. The total photoneutron cross sections determined from these data are between 0.8 and 1.3 standard deviations smaller than previously published results. Here, the excitation spectra measured in this work were fit with a Hauser-Feshbach model. Better fits to the data were obtained with a constant-temperature formulation of the nuclear level density (NLD) than with a Fermi-gas NLD model. The parameters for the constant-temperature NLD model obtained in this work are consistent with those obtained for medium-mass nuclei in previous studies.

Research Organization:
Ohio Univ., Athens, OH (United States); Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA), Office of Nonproliferation and Verification Research and Development (NA-22); USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113)
Grant/Contract Number:
FG02-88ER40387; FG02-97ER41033; NA0001837; NA0002793; NA0002905
OSTI ID:
1610111
Alternate ID(s):
OSTI ID: 1484057; OSTI ID: 1635793
Journal Information:
Physical Review C, Vol. 98, Issue 5; ISSN 2469-9985
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 1 work
Citation information provided by
Web of Science

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Figures / Tables (23)

FIG. 1(p. 15)figure FIG. 1
FIG. 2(p. 16)figure FIG. 2
FIG. 3(p. 17)figure FIG. 3
FIG. 4(p. 18)figure FIG. 4
FIG. 5(p. 19)figure FIG. 5
FIG. 6(p. 20)figure FIG. 6
FIG. 7(p. 21)figure FIG. 7
FIG. 8(p. 22)figure FIG. 8
FIG. 9(p. 23)figure FIG. 9
FIG. 10(p. 24)figure FIG. 10
Fig. 11(p. 25)figure Fig. 11
FIG. 12(p. 27)figure FIG. 12
FIG. 13(p. 28)figure FIG. 13
FIG. 14(p. 29)figure FIG. 14
FIG. 15(p. 30)figure FIG. 15
FIG. 16(p. 31)figure FIG. 16
FIG. 17(p. 32)figure FIG. 17
FIG. 18(p. 33)figure FIG. 18
FIG. 19(p. 34)figure FIG. 19
TABLE I(p. 36)table TABLE I
TABLE II(p. 37)table TABLE II
TABLE III(p. 38)table TABLE III
TABLE IV(p. 39)table TABLE IV

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Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
physics
beam polarization
energy levels &amp; level densities
photonuclear reactions
s process
free-electron lasers
59 ≤ A ≤ 89
gamma-ray techniques
neutron scattering
nuclear data analysis &amp; compilation
time-of-flight neutron spectroscopy