Experimental Investigation of the 19Ne(p,γ)20Na Reaction Rate and Implications for Breakout from the Hot CNO Cycle

Belarge, J.; Kuvin, S.  A.; Baby, L. T.; Baker, J.; Wiedenhöver, I.; Höflich, P.; Volya, A.; Blackmon, J. C.; Deibel, C. M.; Gardiner, H. E.; Lai, J.; Linhardt, L. E.; Macon, K. T.; Need, E.; Rasco, B. C.; Quails, N.; Colbert, K.; Gay, D. L.; Keeley, N.

doi:10.1103/physrevlett.117.182701

Experimental Investigation of the ¹⁹Ne(p,γ)²⁰Na Reaction Rate and Implications for Breakout from the Hot CNO Cycle

Journal Article · Thu Oct 27 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.117.182701· OSTI ID:1669891

Belarge, J. ^[1]; Kuvin, S. A. ^[2]; Baby, L. T. ^[2]; Baker, J. ^[2]; Wiedenhöver, I. ^[2]; Höflich, P. ^[2]; Volya, A. ^[2]; Blackmon, J. C. ^[3]; Deibel, C. M. ^[3]; Gardiner, H. E. ^[3]; Lai, J. ^[3]; Linhardt, L. E. ^[3]; Macon, K. T. ^[3]; Need, E. ^[3]; Rasco, B. C. ^[3]; Quails, N. ^[4]; Colbert, K. ^[4]; Gay, D. L. ^[4]; Keeley, N. ^[5]

Florida State University, Tallahassee, FL (United States); Florida State University
Florida State University, Tallahassee, FL (United States)
Louisiana State University, Baton Rouge, LA (United States)
University of North Florida, Jacksonville, FL (United States)
National Centre for Nuclear Research, Otwock (Poland)

The ¹⁹Ne(p,γ)²⁰Na reaction is the second step of a reaction chain which breaks out from the hot CNO cycle, following the ¹⁵O(α,γ)¹⁹Ne reaction at the onset of x-ray burst events. We investigate the spectrum of the lowest proton-unbound states in ²⁰Na in an effort to resolve contradictions in spin-parity assignments and extract reliable information about the thermal reaction rate. Here, the proton-transfer reaction ¹⁹Ne(d,n)²⁰Na is measured with a beam of the radioactive isotope ¹⁹Ne at an energy around the Coulomb barrier and in inverse kinematics. We observe three proton resonances with the ¹⁹Ne ground state, at 0.44, 0.66, and 0.82 MeV c.m. energies, which are assigned 3⁺, 1⁺, and (0⁺), respectively. In addition, we identify two resonances with the first excited state in ¹⁹Ne, one at 0.20 MeV and one, tentatively, at 0.54 MeV. These observations allow us for the first time to experimentally quantify the astrophysical reaction rate on an excited nuclear state. Our experiment shows an efficient path for thermal proton capture in ¹⁹Ne(p,γ)²⁰Na, which proceeds through ground state and excited-state capture in almost equal parts and eliminates the possibility for this reaction to create a bottleneck in the breakout from the hot CNO cycle.

View Accepted Manuscript (DOE)

Research Organization:: Florida State University, Tallahassee, FL (United States)

Sponsoring Organization:: National Science Foundation; USDOE; USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-02ER41220; FG02-96ER40978

OSTI ID:: 1669891

Alternate ID(s):: OSTI ID: 1330290
OSTI ID: 1536440

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 18 Vol. 117; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (4)

Experimental study of intruder components in light neutron-rich nuclei via single-nucleon transfer reaction Liu, Wei; Lou, Jian-Ling; Ye, Yan-Lin Nuclear Science and Techniques, Vol. 31, Issue 2 https://doi.org/10.1007/s41365-020-0731-y	journal	February 2020
Nuclear physics of the outer layers of accreting neutron stars Meisel, Zach; Deibel, Alex; Keek, Laurens Journal of Physics G: Nuclear and Particle Physics, Vol. 45, Issue 9 https://doi.org/10.1088/1361-6471/aad171	journal	July 2018
Nuclear Physics of the Outer Layers of Accreting Neutron Stars Meisel, Zach; Deibel, Alex; Keek, Laurens arXiv https://doi.org/10.48550/arxiv.1807.01150	text	January 2018
Experimental study of intruder components in light neutron-rich nuclei via single-nucleon transfer reaction Liu, Wei; Lou, Jian-Ling; Ye, Yan-Lin arXiv https://doi.org/10.48550/arxiv.2103.05357	text	January 2021

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