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α Decay of I109 and Its Implications for the Proton Decay of Sb105 and the Astrophysical Rapid Proton-Capture Process

C. Mazzocchi, R. Grzywacz, S. N. Liddick, K. P. Rykaczewski, H. Schatz, J. C. Batchelder, C. R. Bingham, C. J. Gross, J. H. Hamilton, J. K. Hwang, S. Ilyushkin, A. Korgul, W. Królas, K. Li, R. D. Page, D. Simpson, and J. A. Winger
Phys. Rev. Lett. 98, 212501 – Published 23 May 2007

Abstract

An α-decay branch of (1.4±0.4)×104 has been discovered in the decay of I109, which predominantly decays via proton emission. The measured Qα value of 3918±21keV allows the indirect determination of the Q value for proton emission from Sb105 of 356±22keV, which is approximately of 130 keV more bound than previously reported. This result is relevant for the astrophysical rapid proton-capture process, which would terminate in the Sn105(p,γ)Sb106(p,γ)Te107(αdecay)Sn103 cycle at the densities expected in explosive hydrogen burning scenarios, unless unusually strong pairing effects result in a Sn103(p,γ)Sb104(p,γ)Te105(αdecay)Sn101) cycle.

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  • Received 7 March 2007

DOI:https://doi.org/10.1103/PhysRevLett.98.212501

©2007 American Physical Society

Authors & Affiliations

C. Mazzocchi1,2, R. Grzywacz1,3, S. N. Liddick4, K. P. Rykaczewski3, H. Schatz5, J. C. Batchelder4, C. R. Bingham1,3, C. J. Gross3, J. H. Hamilton6, J. K. Hwang6, S. Ilyushkin7, A. Korgul1,6,8,9, W. Królas9,10, K. Li6, R. D. Page11, D. Simpson1,12, and J. A. Winger4,7,9

  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA
  • 2IFGA, University of Milan and INFN, Milano, I-20133, Italy
  • 3Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4UNIRIB, Oak Ridge Associated Universities, Oak Ridge, Tennessee 37831, USA
  • 5National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 6Department of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USA
  • 7Department of Physics and Astronomy, Mississippi State University, Mississippi 39762, USA
  • 8Institute of Experimental Physics, Warsaw University, Warszawa, PL 00-681, Poland
  • 9Joint Institute for Heavy-Ion Reactions, Oak Ridge, Tennessee 37831, USA
  • 10Institute of Nuclear Physics, Polish Academy of Sciences, PL 31-342 Kraków, Poland
  • 11Department of Physics, University of Liverpool, Liverpool, L69 7ZE, United Kingdom
  • 12Department of Physics, Astronomy, and Geology, East Tennessee State University, Johnson City, Tennessee 37614, USA

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Vol. 98, Iss. 21 — 25 May 2007

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