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; R Talwar; J Sethi; W.B Walters; P.J Woods; S Zhu

doi:10.1016/j.physletb.2019.03.039

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Proton decay of 108I and its significance for the termination of the astrophysical rp-process

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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, …

Physics Letters. B, Vol.792(C), pp.187-192

10/05/2019

DOI: https://doi.org/10.1016/j.physletb.2019.03.039

Abstract

107Te

Proton decay

Astrophysical rp process

104Sb

α decay

108I

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.

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Title: Proton decay of 108I and its significance for the termination of the astrophysical rp-process
Creators: K Auranen - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
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
P Copp - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
H.M David - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
D.T Doherty - University of Edinburgh
J Harker - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, 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
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
T Lauritsen - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
G Lotay - University of Surrey, School of Maths and Physics
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
R Talwar - Physics Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA
J Sethi - 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
Publication Details: Physics Letters. B, Vol.792(C), pp.187-192
Publisher: Elsevier B.V
Date published: 10/05/2019
Date accepted: 20/03/2019
Identifiers: 99542623602346
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

Proton decay of 108I and its significance for the termination of the astrophysical rp-process

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