Determining the rp-process flow through 56Ni: resonances in 57Cu(p,γ)58Zn identified with GRETINA

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

doi:10.1103/PhysRevLett.113.032502

Determining the rp-process flow through 56Ni: resonances in 57Cu(p,γ)58Zn identified with GRETINA

Phys Rev Lett. 2014 Jul 18;113(3):032502. doi: 10.1103/PhysRevLett.113.032502. Epub 2014 Jul 14.

Authors

C Langer¹, F Montes¹, A Aprahamian², D W Bardayan³, D Bazin⁴, B A Brown⁵, J Browne⁶, H Crawford⁷, R H Cyburt¹, C Domingo-Pardo⁸, A Gade⁵, S George⁹, P Hosmer¹⁰, L Keek⁶, A Kontos¹, I-Y Lee⁷, A Lemasson⁴, E Lunderberg⁵, Y Maeda¹¹, M Matos¹², Z Meisel⁶, S Noji⁴, F M Nunes⁵, A Nystrom², G Perdikakis¹³, J Pereira¹, S J Quinn⁶, F Recchia⁴, H Schatz⁶, M Scott⁶, K Siegl², A Simon¹, M Smith², A Spyrou⁶, J Stevens⁶, S R Stroberg⁵, D Weisshaar⁴, J Wheeler⁶, K Wimmer¹⁴, R G T Zegers⁶

Affiliations

¹ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA.
² Department of Physics and Joint Institute for Nuclear Astrophysics, University of Notre Dame, Notre Dame, Indiana 46556, USA.
³ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁴ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
⁵ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
⁶ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
⁷ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
⁸ IFIC, CSIC-University of Valencia, E-46071 Valencia, Spain.
⁹ Ernst-Moritz-Arndt-Universität, 17487 Greifswald, Germany.
¹⁰ Department of Physics, Hillsdale College, Hillsdale, Michigan 49242, USA.
¹¹ Department of Applied Physics, University of Miyazaki, Miyazaki, Miyazaki 889-2192, Japan.
¹² Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803-4001, USA.
¹³ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.
¹⁴ National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA and Department of Physics, Central Michigan University, Mount Pleasant, Michigan 48859, USA.

PMID: 25083636
DOI: 10.1103/PhysRevLett.113.032502

Abstract

An approach is presented to experimentally constrain previously unreachable (p, γ) reaction rates on nuclei far from stability in the astrophysical rp process. Energies of all critical resonances in the (57)Cu(p,γ)(58)Zn reaction are deduced by populating states in (58)Zn with a (d, n) reaction in inverse kinematics at 75 MeV/u, and detecting γ-ray-recoil coincidences with the state-of-the-art γ-ray tracking array GRETINA and the S800 spectrograph at the National Superconducting Cyclotron Laboratory. The results reduce the uncertainty in the (57)Cu(p,γ) reaction rate by several orders of magnitude. The effective lifetime of (56)Ni, an important waiting point in the rp process in x-ray bursts, can now be determined entirely from experimentally constrained reaction rates.