Physics Letters B (Jun 2022)
57Zn β-delayed proton emission establishes the 56Ni rp-process waiting point bypass
- M. Saxena,
- W. -J Ong,
- Z. Meisel,
- D.E.M. Hoff,
- N. Smirnova,
- P.C. Bender,
- S.P. Burcher,
- M.P. Carpenter,
- J.J. Carroll,
- A. Chester,
- C.J. Chiara,
- R. Conaway,
- P.A. Copp,
- B.P. Crider,
- J. Derkin,
- A. Estradé,
- G. Hamad,
- J.T. Harke,
- R. Jain,
- H. Jayatissa,
- S.N. Liddick,
- B. Longfellow,
- M. Mogannam,
- F. Montes,
- N. Nepal,
- T.H. Ogunbeku,
- A.L. Richard,
- H. Schatz,
- D. Soltesz,
- S.K. Subedi,
- I. Sultana,
- A.S. Tamashiro,
- V. Tripathi,
- Y. Xiao,
- R. Zink
Affiliations
- M. Saxena
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA; Corresponding author.
- W. -J Ong
- Lawrence Livermore National Laboratory, Livermore, 94550, CA, USA
- Z. Meisel
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- D.E.M. Hoff
- Lawrence Livermore National Laboratory, Livermore, 94550, CA, USA; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, 01854, MA, USA
- N. Smirnova
- CENBG, CNRS/IN2P3 and Université de Bordeaux, Chemin du Solarium, 33175, Gradignan Cedex, France
- P.C. Bender
- Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, 01854, MA, USA
- S.P. Burcher
- Lawrence Livermore National Laboratory, Livermore, 94550, CA, USA
- M.P. Carpenter
- Argonne National Laboratory, Argonne, 60439, IL, USA
- J.J. Carroll
- DEVCOM/Army Research Laboratory, Adelphi, 20783, MD, USA
- A. Chester
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA
- C.J. Chiara
- DEVCOM/Army Research Laboratory, Adelphi, 20783, MD, USA
- R. Conaway
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- P.A. Copp
- Argonne National Laboratory, Argonne, 60439, IL, USA
- B.P. Crider
- Department of Physics & Astronomy, Mississippi State University, Starkville, 39762, MS, USA
- J. Derkin
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- A. Estradé
- Department of Physics, Central Michigan University, Mount Pleasant, 48859, MI, USA
- G. Hamad
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- J.T. Harke
- Lawrence Livermore National Laboratory, Livermore, 94550, CA, USA
- R. Jain
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, 48824, MI, USA
- H. Jayatissa
- Argonne National Laboratory, Argonne, 60439, IL, USA
- S.N. Liddick
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Chemistry, Michigan State University, East Lansing, 48824, MI, USA; Joint Institute for Nuclear Astrophysics – Center for the Evolution of the Elements, Michigan State University, East Lansing, 48824, MI, USA
- B. Longfellow
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, 48824, MI, USA
- M. Mogannam
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Chemistry, Michigan State University, East Lansing, 48824, MI, USA
- F. Montes
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA
- N. Nepal
- Department of Physics, Central Michigan University, Mount Pleasant, 48859, MI, USA
- T.H. Ogunbeku
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Physics & Astronomy, Mississippi State University, Starkville, 39762, MS, USA
- A.L. Richard
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Joint Institute for Nuclear Astrophysics – Center for the Evolution of the Elements, Michigan State University, East Lansing, 48824, MI, USA
- H. Schatz
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Physics & Astronomy, Michigan State University, East Lansing, 48824, MI, USA; Joint Institute for Nuclear Astrophysics – Center for the Evolution of the Elements, Michigan State University, East Lansing, 48824, MI, USA
- D. Soltesz
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- S.K. Subedi
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- I. Sultana
- Department of Physics, Central Michigan University, Mount Pleasant, 48859, MI, USA
- A.S. Tamashiro
- Department of Physics, Oregon State University, Corvallis, 97331, OR, USA
- V. Tripathi
- Department of Physics, Florida State University, Tallahassee, 32306, FL, USA
- Y. Xiao
- National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, 48824, MI, USA; Department of Physics & Astronomy, Mississippi State University, Starkville, 39762, MS, USA
- R. Zink
- Institute of Nuclear & Particle Physics, Department of Physics & Astronomy, Ohio University, Athens, 45701, OH, USA
- Journal volume & issue
-
Vol. 829
p. 137059
Abstract
We measured the Zn57 β-delayed proton (βp) and γ emission at the National Superconducting Cyclotron Laboratory. We find a Zn57 half-life of 43.6±0.2 ms, βp branching ratio of (84.7±1.4)%, and identify four transitions corresponding to the exotic β-γ-p decay mode, the second such identification in the fp-shell. The p/γ ratio was used to correct for isospin mixing while determining the Zn57 mass via the isobaric multiplet mass equation. Previously, it was uncertain as to whether the rp-process flow could bypass the textbook waiting point Ni56 for astrophysical conditions relevant to Type-I X-ray bursts. Our results definitively establish the existence of the Ni56 bypass, with 14-17% of the rp-process flow taking this route.
