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Phys Rev Lett. 2007 May 25;98(21):212501. Epub 2007 May 23.

Alpha decay of 109I and its implications for the proton decay of 105Sb and the astrophysical rapid proton-capture process.

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  • 1Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996, USA.


An alpha-decay branch of (1.4+/-0.4) x 10(-4) has been discovered in the decay of 109I, which predominantly decays via proton emission. The measured Q(alpha) 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,gamma)106Sb(p,gamma)107Te(alpha decay)103Sn cycle at the densities expected in explosive hydrogen burning scenarios, unless unusually strong pairing effects result in a 103Sn(p,gamma)104Sb(p,gamma)105Te(alpha decay)101Sn) cycle.

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