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Title: Measurement of the In 115   ( γ , γ ' ) In 115 m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams

Abstract

For the first time the excitation cross section of $$^{115}\mathrm{In}$$ to its first excited state at 336.24 keV has been measured with monoenergetic photon beams at 15 energies between 1.8 and 3.7 MeV. The measurements were performed at the High-Intensity Gamma-ray Source ($$\mathrm{HI}{\gamma}\mathrm{S}$$) facility with natural In targets and incident photon fluxes ranging from $$0.7\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$$ to $$3.2\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$$. The inelastic scattering cross section was obtained from the yield of the 336.24 keV deexcitation $${\gamma}$$ rays. The cross-section values varied between < 0.05 and 28.7 $${\mu}\mathrm{b}$$ at 1.8 and 3.7 MeV, respectively. Compared to standard photon inelastic scattering cross-section data in this energy range of medium-mass nuclei, these extremely small values are not completely unexpected, given the nature of the low-lying nuclear levels of $$^{115}\mathrm{In}$$. Model calculations, however, overestimate the measured cross-section data by approximately one order of magnitude. Using different choices for the $$E1 {\gamma}$$-ray strength function, the data can be well described. Finally, the data are important for improving our knowledge of the level scheme of $$^{115}\mathrm{In}$$, especially spin and parity assignments of already known states.

Authors:
 [1];  [1];  [1];  [1];  [2]
  1. Duke Univ., Durham, NC (United States). Dept. of Physics; Triangle Universities Nuclear Lab., Durham, NC (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nuclear and Chemical Sciences Division
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Duke Univ., Durham, NC (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1529175
Alternate Identifier(s):
OSTI ID: 1484685; OSTI ID: 1484826
Report Number(s):
LLNL-JRNL-759602
Journal ID: ISSN 2469-9985; PRVCAN; 947977
Grant/Contract Number:  
AC52-07NA27344; FG02-97ER41033
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 98; Journal Issue: 6; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; electromagnetic transitions; energy levels & level densities; nuclear reactions; nuclear spin & parity; photonuclear reactions

Citation Formats

Tornow, W., Bhike, M., Finch, S. W., Krishichayan, ., and Tonchev, A. P. Measurement of the In115 (γ,γ')In115m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams. United States: N. p., 2018. Web. doi:10.1103/PhysRevC.98.064305.
Tornow, W., Bhike, M., Finch, S. W., Krishichayan, ., & Tonchev, A. P. Measurement of the In115 (γ,γ')In115m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams. United States. doi:10.1103/PhysRevC.98.064305.
Tornow, W., Bhike, M., Finch, S. W., Krishichayan, ., and Tonchev, A. P. Thu . "Measurement of the In115 (γ,γ')In115m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams". United States. doi:10.1103/PhysRevC.98.064305. https://www.osti.gov/servlets/purl/1529175.
@article{osti_1529175,
title = {Measurement of the In115 (γ,γ')In115m inelastic scattering cross section in the 1.8 to 3.7 MeV energy range with monoenergetic photon beams},
author = {Tornow, W. and Bhike, M. and Finch, S. W. and Krishichayan, . and Tonchev, A. P.},
abstractNote = {For the first time the excitation cross section of $^{115}\mathrm{In}$ to its first excited state at 336.24 keV has been measured with monoenergetic photon beams at 15 energies between 1.8 and 3.7 MeV. The measurements were performed at the High-Intensity Gamma-ray Source ($\mathrm{HI}{\gamma}\mathrm{S}$) facility with natural In targets and incident photon fluxes ranging from $0.7\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$ to $3.2\times{}{10}^{7}{\gamma}/({\mathrm{cm}}^{2}{s})$. The inelastic scattering cross section was obtained from the yield of the 336.24 keV deexcitation ${\gamma}$ rays. The cross-section values varied between < 0.05 and 28.7 ${\mu}\mathrm{b}$ at 1.8 and 3.7 MeV, respectively. Compared to standard photon inelastic scattering cross-section data in this energy range of medium-mass nuclei, these extremely small values are not completely unexpected, given the nature of the low-lying nuclear levels of $^{115}\mathrm{In}$. Model calculations, however, overestimate the measured cross-section data by approximately one order of magnitude. Using different choices for the $E1 {\gamma}$-ray strength function, the data can be well described. Finally, the data are important for improving our knowledge of the level scheme of $^{115}\mathrm{In}$, especially spin and parity assignments of already known states.},
doi = {10.1103/PhysRevC.98.064305},
journal = {Physical Review C},
issn = {2469-9985},
number = 6,
volume = 98,
place = {United States},
year = {2018},
month = {12}
}

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