Physics Letters B (May 2019)
Proton decay of 108I and its significance for the termination of the astrophysical rp-process
- K. Auranen,
- D. Seweryniak,
- M. Albers,
- A.D. Ayangeakaa,
- S. Bottoni,
- M.P. Carpenter,
- C.J. Chiara,
- P. Copp,
- H.M. David,
- D.T. Doherty,
- J. Harker,
- C.R. Hoffman,
- R.V.F. Janssens,
- T.L. Khoo,
- S.A. Kuvin,
- T. Lauritsen,
- G. Lotay,
- A.M. Rogers,
- C. Scholey,
- J. Sethi,
- R. Talwar,
- W.B. Walters,
- P.J. Woods,
- S. Zhu
Affiliations
- K. Auranen
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Corresponding author.
- D. Seweryniak
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- M. Albers
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- A.D. Ayangeakaa
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- S. Bottoni
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- M.P. Carpenter
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- C.J. Chiara
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
- P. Copp
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
- H.M. David
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- D.T. Doherty
- University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- J. Harker
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
- C.R. Hoffman
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- R.V.F. Janssens
- Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA; Triangle Universities Nuclear Laboratory, Duke University, Durham, NC 27708, USA
- T.L. Khoo
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- S.A. Kuvin
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Department of Physics, University of Connecticut, Storrs, CT 06269, USA
- T. Lauritsen
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- G. Lotay
- University of Surrey, Guildford GU2 7XH, United Kingdom
- A.M. Rogers
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- C. Scholey
- Department of Physics, University of Jyvaskyla, P.O. Box 35, FI-40014 University of Jyvaskyla, Finland
- J. Sethi
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA; Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
- R. Talwar
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- W.B. Walters
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD 20742, USA
- P.J. Woods
- University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
- S. Zhu
- Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
- Journal volume & issue
-
Vol. 792
pp. 187 – 192
Abstract
Employing the Argonne Fragment Mass Analyzer and the implantation-decay-decay correlation technique, a weak 0.50(21)% proton decay branch was identified in 108I for the first time. The 108I proton-decay width is consistent with a hindered l=2 emission, suggesting a d52 origin. Using the extracted 108I proton-decay Q value of 597(13) keV, and the Qα values of the 108I and 107Te isotopes, a proton-decay Q value of 510(20) keV for 104Sb was deduced. Similarly to the 112,113Cs proton-emitter pair, the Qp(I108) value is lower than that for the less-exotic neighbor 109I, possibly due to enhanced proton-neutron interactions in N≈Z nuclei. In contrast, the present Qp(Sb104) is higher than that of 105Sb, suggesting a weaker interaction energy. For the present Qp(Sb104) value, network calculations with the one-zone X-ray burst model Mazzocchi et al. (2007) [18] predict no significant branching into the Sn-Sb-Te cycle at 103Sn. Keywords: α decay, Proton decay, Astrophysical rp process, 104Sb, 107Te, 108I
