Low-lying level structure of $^{56}\mathbf{Cu}$ and its implications for the $\mathit{rp}$ process

Ong, W. -J.; Langer, C.; Montes, F.; Aprahamian, A.; Bardayan, D. W.; Bazin, D.; Brown, B. A.; Browne, J.; Crawford, H.; Cyburt, R.; Deleeuw, E. B.; Domingo-Pardo, C.; Gade, A.; George, S.; Hosmer, P.; Keek, L.; Kontos, A.; Lee, I. -Y.; Lemasson, A.; Lunderberg, E.; Maeda, Y.; Matos, M.; Meisel, Z.; Noji, S.; Nunes, F. M.; Nystrom, A.; Perdikakis, G.; Pereira, J.; Quinn, S. J.; Recchia, F.; Schatz, H.; Scott, M.; Siegl, K.; Simon, A.; Smith, M.; Spyrou, A.; Stevens, J.; Stroberg, S. R.; Weisshaar, D.; Wheeler, J.; Wimmer, K.; Zegers, R. G.  T.

doi:10.1103/PhysRevC.95.055806

Low-lying level structure of $$^{56}\mathbf{Cu}$$ and its implications for the $$\mathit{rp}$$ process

Journal Article · Fri May 19 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.055806· OSTI ID:1463324

Ong, W. -J. ^[1]; Langer, C.; Montes, F.; Aprahamian, A.; Bardayan, D. W.; Bazin, D.; Brown, B. A.; Browne, J.; Crawford, H.; Cyburt, R.; Deleeuw, E. B.; Domingo-Pardo, C.; Gade, A.; George, S.; Hosmer, P.; Keek, L.; Kontos, A.; Lee, I. -Y.; Lemasson, A.; Lunderberg, E. more »

Michigan State University

The low-lying energy levels of proton-rich

{}_{56}{Cu}

have been extracted using in-beam

γ

-ray spectroscopy with the state-of-the-art

γ

-ray tracking array GRETINA in conjunction with the S800 spectrograph at the National Superconducting Cyclotron Laboratory at Michigan State University. Excited states in

{}_{56}{Cu}

serve as resonances in the

{}_{55}{Ni} (p, γ) {}_{56}{Cu}

reaction, which is a part of the

rp

process in type-I x-ray bursts. To resolve existing ambiguities in the reaction

Q

value, a more localized isobaric multiplet mass equation (IMME) fit is used, resulting in

Q = 639 \pm 82

keV. We derive the first experimentally constrained thermonuclear reaction rate for

{}_{55}{Ni} (p, γ) {}_{56}{Cu}

. We discover that, with this new rate, the

rp

process may bypass the

{}_{56}{Ni}

waiting point via the

{}_{55}{Ni} (p, γ)

reaction for typical x-ray burst conditions with a branching of up to

~ 40 %

. We further identify additional nuclear physics uncertainties that need to be addressed before drawing final conclusions about the

rp

-process reaction flow in the

{}_{56}{Ni}

region.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Contributing Organization:: GRETINA collaboration

Grant/Contract Number:: AC02-05CH11231; NA0002132

OSTI ID:: 1463324

Alternate ID(s):: OSTI ID: 1357939

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (7)

Stellar reaction rate of 55Ni(p, γ)56Cu in Type I X-ray bursts Ma, Shao-Bo; Zhang, Li-Yong; Hu, Jun Nuclear Science and Techniques, Vol. 30, Issue 9 https://doi.org/10.1007/s41365-019-0663-6	journal	August 2019
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
Erratum: High-Precision Mass Measurement of Cu 56 and the Redirection of the r p -Process Flow [Phys. Rev. Lett. 120 , 032701 (2018)] Valverde, A. A.; Brodeur, M.; Bollen, G. Physical Review Letters, Vol. 123, Issue 23 https://doi.org/10.1103/physrevlett.123.239905	journal	December 2019
Dependence of X-Ray Burst Models on Nuclear Masses Schatz, H.; Ong, W. -J. The Astrophysical Journal, Vol. 844, Issue 2 https://doi.org/10.3847/1538-4357/aa7de9	journal	August 2017
Burning in the Tail: Implications for a Burst Oscillation Model Chambers, Frank R. N.; Watts, Anna L.; Keek, Laurens The Astrophysical Journal, Vol. 871, Issue 1 https://doi.org/10.3847/1538-4357/aaf501	journal	January 2019
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
Burning in the tail: implications for a burst oscillation model Chambers, Frank R. N.; Watts, Anna L.; Keek, L. arXiv https://doi.org/10.48550/arxiv.1811.12111	text	January 2018

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