An α-decay branch of (1.4±0.4)×10-4 has been discovered in the decay of 109I, which predominantly decays via proton emission. The measured Qα value of 3918±21 keV allows the indirect determination of the Q value for proton emission from 105Sb of 356±22 keV, 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 105Sn(p,γ)106Sb(p,γ)107Te(α decay)103Sn cycle at the densities expected in explosive hydrogen burning scenarios, unless unusually strong pairing effects result in a 103Sn(p,γ)104Sb(p,γ)105Te(α decay)101Sn) cycle.
α decay of 109I and its implications for the proton decay of 105Sb and the astro-physical 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, J.A. Winger. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 98:21(2007 May 25), pp. 212501.212501-1-212501.212501-5.
α decay of 109I and its implications for the proton decay of 105Sb and the astro-physical rapid proton-capture process
C. Mazzocchi;
2007
Abstract
An α-decay branch of (1.4±0.4)×10-4 has been discovered in the decay of 109I, which predominantly decays via proton emission. The measured Qα value of 3918±21 keV allows the indirect determination of the Q value for proton emission from 105Sb of 356±22 keV, 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 105Sn(p,γ)106Sb(p,γ)107Te(α decay)103Sn cycle at the densities expected in explosive hydrogen burning scenarios, unless unusually strong pairing effects result in a 103Sn(p,γ)104Sb(p,γ)105Te(α decay)101Sn) cycle.
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