High-Precision Mass Measurement of Cu 56 and the Redirection of the r p -Process Flow

Valverde, A.  A.; Brodeur, M.; Bollen, G.; Eibach, M.; Gulyuz, K.; Hamaker, A.; Izzo, C.; Ong, W. -J.; Puentes, D.; Redshaw, M.; Ringle, R.; Sandler, R.; Schwarz, S.; Sumithrarachchi, C.  S.; Surbrook, J.; Villari, A.  C. C.; Yandow, I.  T.

doi:10.1103/physrevlett.120.032701

High-Precision Mass Measurement of ${}^{56}{Cu}$ and the Redirection of the $r p$ -Process Flow

Journal Article · Fri Jan 19 00:00:00 EST 2018 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.120.032701· OSTI ID:1671793

Valverde, A. A. ^[1]; Brodeur, M. ^[2]; Bollen, G. ^[3]; Eibach, M. ^[4]; Gulyuz, K. ^[5]; Hamaker, A. ^[5]; Izzo, C. ^[5]; Ong, W. -J. ^[5]; Puentes, D. ^[5]; Redshaw, M. ^[6]; Ringle, R. ^[5]; Sandler, R. ^[7]; Schwarz, S. ^[5]; Sumithrarachchi, C. S. ^[5]; Surbrook, J. ^[5]; Villari, A. C. C. ^[3]; Yandow, I. T. ^[5]

Univ. of Notre Dame, IN (United States); Central Michigan University
Univ. of Notre Dame, IN (United States)
Michigan State Univ., East Lansing, MI (United States). Facility for Rare Isotope Beams
Univ. Greifswald, Greifswald (Germany); Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.; Central Michigan Univ., Mount Pleasant, MI (United States)
Central Michigan Univ., Mount Pleasant, MI (United States)

We report the mass measurement of ⁵⁶Cu, using the LEBIT 9.4 T Penning trap mass spectrometer at the National Superconducting Cyclotron Laboratory at Michigan State University. The mass of ⁵⁶Cu is critical for constraining the reaction rates of the ⁵⁵Ni(p,y), ⁵⁶Cu(p,y), ⁵⁷Zn(β⁺) ⁵⁷Cu bypass around the ⁵⁶Ni waiting point. Previous recommended mass excess values have disagreed by several hundred keV. Our new value, ME = -38626.7(7.1) keV, is a factor of 30 more precise than the extrapolated value suggested in the 2012 atomic mass evaluation [Chin. Phys. C 36, 1603 (2012)], and more than a factor of 12 more precise than values calculated using local mass extrapolations, while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C 41, 030003 (2017)]. The new experimental average, using our new mass and the value from AME2016, is used to calculate the astrophysical ⁵⁵Ni(p,y) and ⁵⁶Cu(p,y) forward and reverse rates and perform reaction network calculations of the rp process. These show that the rp-process flow redirects around the ⁵⁶Ni waiting point through the ⁵⁵Ni(p,y) route, allowing it to proceed to higher masses more quickly and resulting in a reduction in ashes around this waiting point and an enhancement to higher mass ashes.

View Accepted Manuscript (DOE)

Research Organization:: Central Michigan Univ., Mount Pleasant, MI (United States)

Sponsoring Organization:: European Union (EU); German Federal Ministry of Education and Research; National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: SC0015927

OSTI ID:: 1671793

Alternate ID(s):: OSTI ID: 1417512
OSTI ID: 1541270

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 3 Vol. 120; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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