β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts

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.; Shidling, P.; Sims, H.; Thompson, P.; Zhang, H.

doi:10.1016/j.physletb.2018.01.041

Title: β-delayed γ decay of 20Mg and the ${}^{19}{Ne} {(p, γ)}^{20} Na$ 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 (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 . 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.

Publication Date:: Thu Mar 01 00:00:00 EST 2018

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1437815

Alternate Identifier(s):: OSTI ID: 1495977

Grant/Contract Number:: SC0016052; AC05-00OR22725; NA0003221; NA0000979

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 778 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    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., Shidling, P., Sims, H., Thompson, P., and Zhang, H. β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts.  Netherlands: N. p., 2018. 
Web.  doi:10.1016/j.physletb.2018.01.041.

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                    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., Shidling, P., Sims, H., Thompson, P., & Zhang, H. β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts.  Netherlands.  https://doi.org/10.1016/j.physletb.2018.01.041

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                    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., Shidling, P., Sims, H., Thompson, P., and Zhang, H. Thu .  
"β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts".  Netherlands.  https://doi.org/10.1016/j.physletb.2018.01.041.

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@article{osti_1437815,

  title        = {β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts},

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

  abstractNote = {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 . 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.},

  doi          = {10.1016/j.physletb.2018.01.041},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 778,

  place        = {Netherlands},

  year         = {Thu Mar 01 00:00:00 EST 2018},

  month        = {Thu Mar 01 00:00:00 EST 2018}

}

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Figure 1: Relevant low-lying states in ¹⁹Ne and ²⁰Na labeled with J^π and energy in keV. Energies below the proton threshold in ²⁰Na as well as J^π are adopted from Seweryniak et al. [21] and energies above the proton threshold are from Wallace et al. [22].

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Title: β-delayed γ decay of 20Mg and the Ne 19 ( p , γ ) 20 Na breakout reaction in Type I X-ray bursts

Abstract

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Title: β-delayed γ decay of 20Mg and the ${}^{19}{Ne} {(p, γ)}^{20} Na$ breakout reaction in Type I X-ray bursts