Single-particle shell strengths near the doubly magic nucleus $^{56}$Ni and the $^{56}$Ni(p,$\gamma$)$^{57}$Cu reaction rate in explosive astrophysical burning

D. Kahl; P. J. Woods; T. Poxon-Pearson; F. M. Nunes; B. A. Brown; H. Schatz; T. Baumann; D. Bazin; J. A. Belarge; P. C. Bender; B. Elman; A. Estrade; A. Gade; A. Kankainen; C. Lederer-Woods; S. Lipschutz; B. Longfellow; S. -J. Lonsdale; E. Lunderberg; F. Montes; W. J. Ong; G. Perdikakis; J. Pereira; C. Sullivan; R. Taverner; D. Weisshaar; R. Zegers

doi:10.1016/j.physletb.2019.134803

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arXiv · 1907.11665

Single-particle shell strengths near the doubly magic nucleus $^{56}$Ni and the $^{56}$Ni(p,$\gamma$)$^{57}$Cu reaction rate in explosive astrophysical burning

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Abstract

Angle-integrated cross-section measurements of the $^{56}$Ni(d,n) and (d,p) stripping reactions have been performed to determine the single-particle strengths of low-lying excited states in the mirror nuclei pair $^{57}$Cu-$^{57}$Ni situated adjacent to the doubly magic nucleus $^{56}$Ni. The reactions were studied in inverse kinematics utilizing a beam of radioactive $^{56}$Ni ions in conjunction with the GRETINA $\gamma$-array. Spectroscopic factors are compared with new shell-model calculations using a full $pf$ model space with the GPFX1A Hamiltonian for the isospin-conserving strong interaction plus Coulomb and charge-dependent Hamiltonians. These results were used to set new constraints on the $^{56}$Ni(p,$\gamma$)$^{57}$Cu reaction rate for explosive burning conditions in x-ray bursts, where $^{56}$Ni represents a key waiting point in the astrophysical rp-process.

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D. Kahl, P. J. Woods, T. Poxon-Pearson, F. M. Nunes, B. A. Brown, H. Schatz, T. Baumann, D. Bazin, J. A. Belarge, P. C. Bender, B. Elman, A. Estrade, A. Gade, A. Kankainen, C. Lederer-Woods, S. Lipschutz, B. Longfellow, S. -J. Lonsdale, E. Lunderberg, F. Montes, W. J. Ong, G. Perdikakis, J. Pereira, C. Sullivan, R. Taverner, D. Weisshaar, R. Zegers. 2019-07-26. Single-particle shell strengths near the doubly magic nucleus $^{56}$Ni and the $^{56}$Ni(p,$\gamma$)$^{57}$Cu reaction rate in explosive astrophysical burning. https://doi.org/10.1016/j.physletb.2019.134803

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