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Title: New portal to the O 15 ( α , γ ) Ne 19 resonance triggering CNO-cycle breakout

Abstract

The 15O(α,γ) 19Ne reaction is expected to trigger the initial path for breakout from the CNO hydrogen-burning cycles to the rapid proton capture (rp) process in type I x-ray bursts on accreting neutron stars. The thermonuclear reaction rate has a major impact on models of type I x-ray burst observables and it depends on the small α-particle branching ratio, Γ α/Γ, of the 4.03 MeV state in 19Ne. Attempts to measure Γ α/Γ by populating the 4.03 MeV state using nuclear reactions have only led to strong upper limits. In the present work, we report the first experimental evidence that the 4.03 MeV 19Ne state is populated in 20Mg β-delayed proton emission. Furthermore this new channel has the potential to provide the necessary sensitivity to detect a finite value of Γ α/Γ.

Authors:
 [1];  [1];  [1];  [2];  [2];  [1];  [1]; ORCiD logo [3]; ORCiD logo [3];  [1];  [2];  [2];  [1];  [2];  [1]; ORCiD logo [4];  [1];  [5];  [6];  [3] more »;  [1] « less
  1. Michigan State Univ., East Lansing, MI (United States)
  2. Univ. of Notre Dame, Notre Dame, IN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  5. Texas A & M Univ., College Station, TX (United States)
  6. Univ. of Surrey, Guildford (United Kingdom)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1513412
Alternate Identifier(s):
OSTI ID: 1395605
Grant/Contract Number:  
AC05-00OR22725; SC0016052; NA0003221; NA0000979
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
Journal Volume: 96; Journal Issue: 3; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Wrede, C., Glassman, B. E., Pérez-Loureiro, D., Allen, J. M., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, Kelly A., Febbraro, Michael T., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W. -J., Pain, Steven D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, Paul James, and Zhang, H. New portal to the O15(α,γ)Ne19 resonance triggering CNO-cycle breakout. United States: N. p., 2017. Web. doi:10.1103/PhysRevC.96.032801.
Wrede, C., Glassman, B. E., Pérez-Loureiro, D., Allen, J. M., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, Kelly A., Febbraro, Michael T., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W. -J., Pain, Steven D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, Paul James, & Zhang, H. New portal to the O15(α,γ)Ne19 resonance triggering CNO-cycle breakout. United States. doi:10.1103/PhysRevC.96.032801.
Wrede, C., Glassman, B. E., Pérez-Loureiro, D., Allen, J. M., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, Kelly A., Febbraro, Michael T., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W. -J., Pain, Steven D., Schwartz, S. B., Shidling, P., Sims, H., Thompson, Paul James, and Zhang, H. Fri . "New portal to the O15(α,γ)Ne19 resonance triggering CNO-cycle breakout". United States. doi:10.1103/PhysRevC.96.032801. https://www.osti.gov/servlets/purl/1513412.
@article{osti_1513412,
title = {New portal to the O15(α,γ)Ne19 resonance triggering CNO-cycle breakout},
author = {Wrede, C. and Glassman, B. E. and Pérez-Loureiro, D. and Allen, J. M. and Bardayan, D. W. and Bennett, M. B. and Brown, B. A. and Chipps, Kelly A. and Febbraro, Michael T. and Fry, C. and Hall, M. R. and Hall, O. and Liddick, S. N. and O'Malley, P. and Ong, W. -J. and Pain, Steven D. and Schwartz, S. B. and Shidling, P. and Sims, H. and Thompson, Paul James and Zhang, H.},
abstractNote = {The 15O(α,γ)19Ne reaction is expected to trigger the initial path for breakout from the CNO hydrogen-burning cycles to the rapid proton capture (rp) process in type I x-ray bursts on accreting neutron stars. The thermonuclear reaction rate has a major impact on models of type I x-ray burst observables and it depends on the small α-particle branching ratio, Γα/Γ, of the 4.03 MeV state in 19Ne. Attempts to measure Γα/Γ by populating the 4.03 MeV state using nuclear reactions have only led to strong upper limits. In the present work, we report the first experimental evidence that the 4.03 MeV 19Ne state is populated in 20Mg β-delayed proton emission. Furthermore this new channel has the potential to provide the necessary sensitivity to detect a finite value of Γα/Γ.},
doi = {10.1103/PhysRevC.96.032801},
journal = {Physical Review C},
issn = {2469-9985},
number = 3,
volume = 96,
place = {United States},
year = {2017},
month = {9}
}

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