In an experiment at the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility, the very small -decay branch of 109I, b = (1.4±0.4)·10−4, has been measured. The Q-value for this transition allowed for the determination of Qp(105Sb) = 356±22 keV, about 130 keV lower than previously claimed. This difference increases the partial half-life for proton decay by several orders of magnitude, making the probability of observing direct proton decay of 105Sb very small, much below any previous experimental limit. The results and consequences for the astrophysical rp-process are discussed
On the alpha decay of 109I and its implications for the proton decay of 105Sb 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, J.A. Winger. - 961:1(2007 Nov 30), pp. 128-133. ((Intervento presentato al 3. convegno International Conference on Proton Emitting Nuclei and Related Topics, PROCON2007 tenutosi a Lisbona nel 2007 [10.1063/1.2827244].
On the alpha decay of 109I and its implications for the proton decay of 105Sb and the astrophysical rapid proton-capture process
C. Mazzocchi;
2007
Abstract
In an experiment at the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility, the very small -decay branch of 109I, b = (1.4±0.4)·10−4, has been measured. The Q-value for this transition allowed for the determination of Qp(105Sb) = 356±22 keV, about 130 keV lower than previously claimed. This difference increases the partial half-life for proton decay by several orders of magnitude, making the probability of observing direct proton decay of 105Sb very small, much below any previous experimental limit. The results and consequences for the astrophysical rp-process are discussed
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