β-delayed γ decay of 20Mg and the Ne19(p,γ)20Na breakout reaction in Type I X-ray bursts

B. E. Glassman; D. Pérez-Loureiro; C. Wrede; J. Allen; D. W. Bardayan; M. B. Bennett; B. A. Brown; K. A. Chipps; M. Febbraro; M. Friedman; C. Fry; M. R. Hall; O. Hall; S. N. Liddick; P. O'Malley; W. J. Ong; S. D. Pain; C. Prokop; S. B. Schwartz; P. Shidling; H. Sims; P. Thompson; H. Zhang

doi:10.1016/j.physletb.2018.01.041

β-delayed γ decay of ²⁰Mg and the Ne19(p,γ)²⁰Na breakout reaction in Type I X-ray bursts

B. E. Glassman, D. Pérez-Loureiro, C. Wrede, J. Allen, D. W. Bardayan, M. B. Bennett, B. A. Brown, K. A. Chipps, M. Febbraro, M. Friedman, C. Fry, M. R. Hall, O. Hall, S. N. Liddick, P. O'Malley, W. J. Ong, S. D. Pain, C. Prokop, S. B. Schwartz, P. ShidlingH. Sims, P. Thompson, H. Zhang

Nuclear Structure and Nuclear Astrophysi

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Certain astrophysical environments such as thermonuclear outbursts on accreting neutron stars (Type-I X-ray bursts) are hot enough to allow for breakout from the Hot CNO hydrogen burning cycles to the rapid proton capture (rp) process. An important breakout reaction sequence is ¹⁵O(α,γ)¹⁹Ne(p,γ)²⁰Na and the ¹⁹Ne(p,γ)²⁰Na reaction rate is expected to be dominated by a single resonance at 457 keV above the proton threshold in ²⁰Na. The resonance strength and, hence, reaction rate depends strongly on whether this ²⁰Na state at an excitation energy of 2647 keV has spin and parity of 1⁺ or 3⁺. Previous ²⁰Mg (J^π=0⁺) β⁺ decay experiments have relied almost entirely on searches for β-delayed proton emission from this resonance in ²⁰Na to limit the log ft value and, hence, J^π. However there is a non-negligible γ-ray branch expected that must also be limited experimentally to determine the log ft value and constrain J^π. We have measured the β-delayed γ decay of ²⁰Mg to complement previous β-delayed proton decay work and provide the first complete limit based on all energetically allowed decay channels through the 2647 keV state. Our limit confirms that a 1⁺ assignment for this state is highly unlikely.

Original language	English
Pages (from-to)	397-402
Number of pages	6
Journal	Physics Letters B
Volume	778
DOIs	https://doi.org/10.1016/j.physletb.2018.01.041
State	Published - Mar 10 2018

Funding

We gratefully acknowledge the NSCL staff for working on the data acquisition system and providing the 20 Mg beam and also Ragnar Stroberg for providing the IMSRG Hamiltonian. This work was supported by the U.S. National Science Foundation under grants No. PHY-1102511 , No. PHY-1419765 , and No. PHY-1404442 , the U.S. Department of Energy , Office of Science, under Award No. DE-SC0016052 , Contract No. DE-AC05-00OR22725 , and the U.S. Department of Energy , National Nuclear Security Administration under Awards No. DE-NA0003221 and No. DE-NA0000979 . We gratefully acknowledge the NSCL staff for working on the data acquisition system and providing the 20Mg beam and also Ragnar Stroberg for providing the IMSRG Hamiltonian. This work was supported by the U.S. National Science Foundation under grants No. PHY-1102511, No. PHY-1419765, and No. PHY-1404442, the U.S. Department of Energy, Office of Science, under Award No. DE-SC0016052, Contract No. DE-AC05-00OR22725, and the U.S. Department of Energy, National Nuclear Security Administration under Awards No. DE-NA0003221 and No. DE-NA0000979.

Funders	Funder number
U.S. National Science Foundation
National Science Foundation	1404442, 1419765, PHY-1404442, PHY-1419765, 1102511, PHY-1102511
U.S. Department of Energy	DE-AC05-00OR22725, DE-SC0016052, DE-NA0000979
Office of Science	DE-NA0003221

Keywords

Hot CNO cycle breakout
X-ray burst
β delayed γ decay

Access to Document

10.1016/j.physletb.2018.01.041

Cite this

Glassman, B. E., Pérez-Loureiro, D., Wrede, C., Allen, J., Bardayan, D. W., Bennett, M. B., Brown, B. A., Chipps, K. A., Febbraro, M., Friedman, M., Fry, C., Hall, M. R., Hall, O., Liddick, S. N., O'Malley, P., Ong, W. J., Pain, S. D., Prokop, C., Schwartz, S. B., ... Zhang, H. (2018). β-delayed γ decay of ²⁰Mg and the Ne19(p,γ)²⁰Na breakout reaction in Type I X-ray bursts. Physics Letters B, 778, 397-402. https://doi.org/10.1016/j.physletb.2018.01.041

@article{41aa91680a35414bb115cb87b91387b8,

title = "β-delayed γ decay of 20Mg and the Ne19(p,γ)20Na breakout reaction in Type I X-ray bursts",

abstract = "Certain astrophysical environments such as thermonuclear outbursts on accreting neutron stars (Type-I X-ray bursts) are hot enough to allow for breakout from the Hot CNO hydrogen burning cycles to the rapid proton capture (rp) process. An important breakout reaction sequence is 15O(α,γ)19Ne(p,γ)20Na and the 19Ne(p,γ)20Na reaction rate is expected to be dominated by a single resonance at 457 keV above the proton threshold in 20Na. The resonance strength and, hence, reaction rate depends strongly on whether this 20Na state at an excitation energy of 2647 keV has spin and parity of 1+ or 3+. Previous 20Mg (Jπ=0+) β+ decay experiments have relied almost entirely on searches for β-delayed proton emission from this resonance in 20Na to limit the log ft value and, hence, Jπ. However there is a non-negligible γ-ray branch expected that must also be limited experimentally to determine the log ft value and constrain Jπ. We have measured the β-delayed γ decay of 20Mg to complement previous β-delayed proton decay work and provide the first complete limit based on all energetically allowed decay channels through the 2647 keV state. Our limit confirms that a 1+ assignment for this state is highly unlikely.",

keywords = "Hot CNO cycle breakout, X-ray burst, β delayed γ decay",

author = "Glassman, {B. E.} and D. P{\'e}rez-Loureiro and C. Wrede and J. Allen and Bardayan, {D. W.} and Bennett, {M. B.} and Brown, {B. A.} and Chipps, {K. A.} and M. Febbraro and M. Friedman and C. Fry and Hall, {M. R.} and O. Hall and Liddick, {S. N.} and P. O'Malley and Ong, {W. J.} and Pain, {S. D.} and C. Prokop and Schwartz, {S. B.} and P. Shidling and H. Sims and P. Thompson and H. Zhang",

note = "Publisher Copyright: {\textcopyright} 2018 The Authors",

year = "2018",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2018.01.041",

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Glassman, BE, Pérez-Loureiro, D, Wrede, C, Allen, J, Bardayan, DW, Bennett, MB, Brown, BA, Chipps, KA, Febbraro, M, Friedman, M, Fry, C, Hall, MR, Hall, O, Liddick, SN, O'Malley, P, Ong, WJ, Pain, SD, Prokop, C, Schwartz, SB, Shidling, P, Sims, H, Thompson, P & Zhang, H 2018, 'β-delayed γ decay of ²⁰Mg and the Ne19(p,γ)²⁰Na breakout reaction in Type I X-ray bursts', Physics Letters B, vol. 778, pp. 397-402. https://doi.org/10.1016/j.physletb.2018.01.041

TY - JOUR

T1 - β-delayed γ decay of 20Mg and the Ne19(p,γ)20Na breakout reaction in Type I X-ray bursts

AU - Glassman, B. E.

AU - Pérez-Loureiro, D.

AU - Wrede, C.

AU - Allen, J.

AU - Bardayan, D. W.

AU - Bennett, M. B.

AU - Brown, B. A.

AU - Chipps, K. A.

AU - Febbraro, M.

AU - Friedman, M.

AU - Fry, C.

AU - Hall, M. R.

AU - Hall, O.

AU - Liddick, S. N.

AU - O'Malley, P.

AU - Ong, W. J.

AU - Pain, S. D.

AU - Prokop, C.

AU - Schwartz, S. B.

AU - Shidling, P.

AU - Sims, H.

AU - Thompson, P.

AU - Zhang, H.

PY - 2018/3/10

Y1 - 2018/3/10

N2 - Certain astrophysical environments such as thermonuclear outbursts on accreting neutron stars (Type-I X-ray bursts) are hot enough to allow for breakout from the Hot CNO hydrogen burning cycles to the rapid proton capture (rp) process. An important breakout reaction sequence is 15O(α,γ)19Ne(p,γ)20Na and the 19Ne(p,γ)20Na reaction rate is expected to be dominated by a single resonance at 457 keV above the proton threshold in 20Na. The resonance strength and, hence, reaction rate depends strongly on whether this 20Na state at an excitation energy of 2647 keV has spin and parity of 1+ or 3+. Previous 20Mg (Jπ=0+) β+ decay experiments have relied almost entirely on searches for β-delayed proton emission from this resonance in 20Na to limit the log ft value and, hence, Jπ. However there is a non-negligible γ-ray branch expected that must also be limited experimentally to determine the log ft value and constrain Jπ. We have measured the β-delayed γ decay of 20Mg to complement previous β-delayed proton decay work and provide the first complete limit based on all energetically allowed decay channels through the 2647 keV state. Our limit confirms that a 1+ assignment for this state is highly unlikely.

AB - Certain astrophysical environments such as thermonuclear outbursts on accreting neutron stars (Type-I X-ray bursts) are hot enough to allow for breakout from the Hot CNO hydrogen burning cycles to the rapid proton capture (rp) process. An important breakout reaction sequence is 15O(α,γ)19Ne(p,γ)20Na and the 19Ne(p,γ)20Na reaction rate is expected to be dominated by a single resonance at 457 keV above the proton threshold in 20Na. The resonance strength and, hence, reaction rate depends strongly on whether this 20Na state at an excitation energy of 2647 keV has spin and parity of 1+ or 3+. Previous 20Mg (Jπ=0+) β+ decay experiments have relied almost entirely on searches for β-delayed proton emission from this resonance in 20Na to limit the log ft value and, hence, Jπ. However there is a non-negligible γ-ray branch expected that must also be limited experimentally to determine the log ft value and constrain Jπ. We have measured the β-delayed γ decay of 20Mg to complement previous β-delayed proton decay work and provide the first complete limit based on all energetically allowed decay channels through the 2647 keV state. Our limit confirms that a 1+ assignment for this state is highly unlikely.

KW - Hot CNO cycle breakout

KW - X-ray burst

KW - β delayed γ decay

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DO - 10.1016/j.physletb.2018.01.041

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