New portal to the resonance triggering CNO-cycle breakout
- Michigan State Univ., East Lansing, MI (United States)
- Univ. of Notre Dame, Notre Dame, IN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Texas A & M Univ., College Station, TX (United States)
- Univ. of Surrey, Guildford (United Kingdom)
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.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-00OR22725; SC0016052; NA0003221; NA0000979
- OSTI ID:
- 1513412
- Alternate ID(s):
- OSTI ID: 1395605
- Journal Information:
- Physical Review C, Vol. 96, Issue 3; ISSN 2469-9985
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Nuclear physics of the outer layers of accreting neutron stars
|
journal | July 2018 |
Nuclear Physics of the Outer Layers of Accreting Neutron Stars | text | January 2018 |
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