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

Abstract

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.

Authors:
 [1];  [1]; ORCiD logo [1];  [1];  [1];  [2]
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  1. Duke Univ., Durham, NC (United States)
  2. Ohio Univ., Athens, OH (United States)
Publication Date:
Research Org.:
Ohio Univ., Athens, OH (United States); Duke Univ., Durham, NC (United States)
Sponsoring Org.:
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)
OSTI Identifier:
1610111
Alternate Identifier(s):
OSTI ID: 1484057; OSTI ID: 1635793
Grant/Contract Number:  
FG02-88ER40387; FG02-97ER41033; NA0001837; NA0002793; NA0002905
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 5; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; physics; beam polarization; energy levels & level densities; photonuclear reactions; s process; free-electron lasers; 59 ≤ A ≤ 89; gamma-ray techniques; neutron scattering; nuclear data analysis & compilation; time-of-flight neutron spectroscopy

Citation Formats

Yates, Stephen A., Fallin, B., Howell, C. R., Krishichayan, ., Tornow, W., and Grimes, S. M. Measurement of the Se80(γ,n) reaction with linearly polarized γ rays. United States: N. p., 2018. Web. doi:10.1103/physrevc.98.054621.
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Yates, Stephen A., Fallin, B., Howell, C. R., Krishichayan, ., Tornow, W., & Grimes, S. M. Measurement of the Se80(γ,n) reaction with linearly polarized γ rays. United States. https://doi.org/10.1103/physrevc.98.054621
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Yates, Stephen A., Fallin, B., Howell, C. R., Krishichayan, ., Tornow, W., and Grimes, S. M. Fri . "Measurement of the Se80(γ,n) reaction with linearly polarized γ rays". United States. https://doi.org/10.1103/physrevc.98.054621. https://www.osti.gov/servlets/purl/1610111.
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@article{osti_1610111,
title = {Measurement of the Se80(γ,n) reaction with linearly polarized γ rays},
author = {Yates, Stephen A. and Fallin, B. and Howell, C. R. and Krishichayan, . and Tornow, W. and Grimes, S. M.},
abstractNote = {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.},
doi = {10.1103/physrevc.98.054621},
journal = {Physical Review C},
number = 5,
volume = 98,
place = {United States},
year = {Fri Nov 30 00:00:00 EST 2018},
month = {Fri Nov 30 00:00:00 EST 2018}
}
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Journal Article:
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Publisher's Version of Record
https://doi.org/10.1103/physrevc.98.054621
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Figures / Tables:

FIG. 1 FIG. 1: Energy level diagram of the 80Se($\gamma$,n)79Se reaction. A Jπ = 1- state in 80Se is excited by an E1 $\gamma$-ray transition from the 0+ ground state. The Q-value of the reaction is -9.9 MeV. For the incident $\gamma$-ray beam energies used in this experiment, the emitted neutron leavesmore » the residual 79Se nucleus in states with excitation energies from just above 0 (the ground state) up to about 6 MeV. The Jπ states shown for 79Se are for the emission of ℓ = 0 or 1 neutrons. The energy levels depicted for these states are hypothetical examples of possible excitations, as indicated by the ”?” marks next to the Jπ labels.« less
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    Figures / Tables found in this record:

    FIG. 1 (p. 15)figure
    FIG. 2 (p. 16)figure
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    FIG. 5 (p. 19)figure
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    FIG. 19 (p. 34)figure
    TABLE I (p. 36)table
    TABLE II (p. 37)table
    TABLE III (p. 38)table
    TABLE IV (p. 39)table
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