A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section

Robinson, Alan E.

doi:10.1103/PhysRevC.94.024613

Title: A reanalysis of radioisotope measurements of the $^9$Be$$(\gamma,n)^8$$Be cross-section

Abstract

The $^9$Be$$(\gamma,n)^8$$Be reaction is enhanced by a near threshold $1/2^+$ state. Contradictions between existing measurements of this reaction cross-section affect calculations of astrophysical r-process yields, dark matter detector calibrations, and the theory of the nuclear structure of $^9$Be. Select well-documented radioisotope $^9$Be$$(\gamma,n)$$ source yield measurements have been reanalyzed, providing a set of high-accuracy independently measured cross sections. A Breit-Wigner fit of these corrected measurements yields $$E_R=1738.8\pm1.9$$ keV, $$\Gamma_\gamma=0.771\pm0.021$$ eV, and $$\Gamma_n=268\pm15$$ keV for the $1/2^+$ state. A virtual $1/2^+$ state is excluded with 99.3\% confidence.

Authors:

Robinson, Alan E. ^[1]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Publication Date:: Thu Feb 18 00:00:00 EST 2016

Research Org.:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), High Energy Physics (HEP)

OSTI Identifier:: 1280860

Alternate Identifier(s):: OSTI ID: 1297274

Report Number(s):: FERMILAB-PUB-16-029-AE; arXiv:1602.05911
Journal ID: ISSN 2469-9985; 1422183

Grant/Contract Number:: AC02-07CH11359; De-AC02-07CH-11359

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review C

Additional Journal Information:: Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2469-9985

Publisher:: APS

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats


                    Robinson, Alan E. A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevC.94.024613.

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                    Robinson, Alan E. A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section.  United States.  https://doi.org/10.1103/PhysRevC.94.024613

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                    Robinson, Alan E. Thu .  
"A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section".  United States.  https://doi.org/10.1103/PhysRevC.94.024613.  https://www.osti.gov/servlets/purl/1280860.

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@article{osti_1280860,

  title        = {A reanalysis of radioisotope measurements of the $^9$Be$(\gamma,n)^8$Be cross-section},

  author       = {Robinson, Alan E.},

  abstractNote = {The $^9$Be$(\gamma,n)^8$Be reaction is enhanced by a near threshold $1/2^+$ state. Contradictions between existing measurements of this reaction cross-section affect calculations of astrophysical r-process yields, dark matter detector calibrations, and the theory of the nuclear structure of $^9$Be. Select well-documented radioisotope $^9$Be$(\gamma,n)$ source yield measurements have been reanalyzed, providing a set of high-accuracy independently measured cross sections. A Breit-Wigner fit of these corrected measurements yields $E_R=1738.8\pm1.9$ keV, $\Gamma_\gamma=0.771\pm0.021$ eV, and $\Gamma_n=268\pm15$ keV for the $1/2^+$ state. A virtual $1/2^+$ state is excluded with 99.3\% confidence.},

  doi          = {10.1103/PhysRevC.94.024613},

  journal      = {Physical Review C},

  number       = 2,

  volume       = 94,

  place        = {United States},

  year         = {Thu Feb 18 00:00:00 EST 2016},

  month        = {Thu Feb 18 00:00:00 EST 2016}

}

Copy to clipboard

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Title: A reanalysis of radioisotope measurements of the $^9$Be$$(\gamma,n)^8$$Be cross-section

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Inelastic electron scattering from 9Be: Levels below 10 MeV journal, November 1968

Line shape and excitation strength of the first excited state in9Be journal, December 1987

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Gamma radiation following the decay of 124Sb and 124I journal, January 1959

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Dark matter search results from the PICO-60 ${CF}_{3} I$ bubble chamber
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Yields of Neutrons from Photo-Neutron Sources
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Photo-Disintegration Cross Sections of Deuterium and Beryllium for the Gamma-Rays of Sodium 24 and Gallium 72
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Nuclear Data Sheets for A = 38
journal, January 2008

Nuclear Data Sheets for A = 105
journal, August 2005

Gamma-ray energies in the decay of 38Cl
journal, April 2012

Cross section of direct three-body breakup of ⁹ Be for 1576-keV gamma rays
journal, November 1983

Search for the three-body photodisintegration of Be
journal, December 2004

Energy levels of light nuclei
journal, December 2004

Nuclear Data Sheets for A = 207
journal, March 2011

Nuclear Data Sheets for A = 222
journal, November 2011

Nuclear Data Sheets for A = 214
journal, March 2009

Characterization of an INVS model IV neutron counter for high precision () cross-section measurements
journal, August 2011

The emission spectra of NaD2O, InBe, LaBe and NaBe photoneutron sources
journal, December 1973

Atomic effects on α-α scattering to the 8Be ground state
journal, June 1992