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Title: Revised result for the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate for astrophysical rp-process calculations

Abstract

The {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate is of potential importance in the rp process powering type I x-ray bursts. Recently, Clement et al. [Phys. Rev. Lett. 92, 172502 (2004)] [1] presented new data on excitation energies for low-lying proton unbound states in {sup 33}Ar obtained with a new method developed at the National Superconducting Cyclotron Laboratory. We use their data, together with a direct capture model and a shell model calculation, to derive a new reaction rate for use in astrophysical model calculations. In particular, we take into account capture on the first excited state in {sup 32}Cl, and we also present a realistic estimate of the remaining uncertainties. We find that the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate is dominated entirely by capture on the first excited state in {sup 32}Cl over the whole temperature range relevant in x-ray bursts. In the temperature range from 0.2 to 1 GK the rate is up to a factor of 70 larger than the previously recommended rate based on shell model calculations only. The uncertainty is now reduced from up to a factor of 1000 to a factor of 3 at 0.3-0.7 GK and a factor of 6 at 1.5 GK.

Authors:
;  [1];  [2];  [2];  [1]; ;  [1];  [2];  [1];  [2]
  1. National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20771157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 72; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevC.72.065804; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ARGON 33; CAPTURE; CHLORINE 32; EXCITATION; EXCITED STATES; GAMMA RADIATION; NUCLEAR REACTION KINETICS; PROTON REACTIONS; PROTONS; SHELL MODELS; STAR EVOLUTION; X RADIATION

Citation Formats

Schatz, H., Sherrill, B.M., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, Bertulani, C.A., Brown, B.A., Clement, R.R.C., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Sakharuk, A.A., and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824. Revised result for the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate for astrophysical rp-process calculations. United States: N. p., 2005. Web. doi:10.1103/PhysRevC.72.065804.
Schatz, H., Sherrill, B.M., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, Bertulani, C.A., Brown, B.A., Clement, R.R.C., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Sakharuk, A.A., & Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824. Revised result for the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate for astrophysical rp-process calculations. United States. doi:10.1103/PhysRevC.72.065804.
Schatz, H., Sherrill, B.M., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824, Bertulani, C.A., Brown, B.A., Clement, R.R.C., Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, Sakharuk, A.A., and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824. Thu . "Revised result for the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate for astrophysical rp-process calculations". United States. doi:10.1103/PhysRevC.72.065804.
@article{osti_20771157,
title = {Revised result for the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate for astrophysical rp-process calculations},
author = {Schatz, H. and Sherrill, B.M. and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824 and Bertulani, C.A. and Brown, B.A. and Clement, R.R.C. and Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 and Sakharuk, A.A. and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, Michigan 48824},
abstractNote = {The {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate is of potential importance in the rp process powering type I x-ray bursts. Recently, Clement et al. [Phys. Rev. Lett. 92, 172502 (2004)] [1] presented new data on excitation energies for low-lying proton unbound states in {sup 33}Ar obtained with a new method developed at the National Superconducting Cyclotron Laboratory. We use their data, together with a direct capture model and a shell model calculation, to derive a new reaction rate for use in astrophysical model calculations. In particular, we take into account capture on the first excited state in {sup 32}Cl, and we also present a realistic estimate of the remaining uncertainties. We find that the {sup 32}Cl(p,{gamma}){sup 33}Ar reaction rate is dominated entirely by capture on the first excited state in {sup 32}Cl over the whole temperature range relevant in x-ray bursts. In the temperature range from 0.2 to 1 GK the rate is up to a factor of 70 larger than the previously recommended rate based on shell model calculations only. The uncertainty is now reduced from up to a factor of 1000 to a factor of 3 at 0.3-0.7 GK and a factor of 6 at 1.5 GK.},
doi = {10.1103/PhysRevC.72.065804},
journal = {Physical Review. C, Nuclear Physics},
number = 6,
volume = 72,
place = {United States},
year = {Thu Dec 15 00:00:00 EST 2005},
month = {Thu Dec 15 00:00:00 EST 2005}
}