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25 April 2024

» pubmed » pmid15169397

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Precise mass measurement of 68Se, a waiting-point nuclide along the rp process
J A Clark ; G Savard ; K S Sharma ; J Vaz ; J C Wang ; Z Zhou ; A Heinz ; B Blank ; F Buchinger ; J E Crawford ; S Gulick ; J K P Lee ; A F Lev ; D Seweryniak ; G D Sprouse ; W Trimble ;
Date:	14 May 2004
Journal:	Phys Rev Lett, 92 (19), 192501
Abstract:	Mass measurements of 68Ge, 68As, and 68Se have been obtained with the Canadian Penning Trap mass spectrometer. The results determine the mass excess of 68Se as -54 232(19) keV, the first measurement with a precision and reliability sufficient to address the light-curve and energy output of x-ray bursts as well as the abundances of the elements synthesized. Under typical conditions used for modeling x-ray bursts, 68Se is found to cause a significant delay in the rp process nucleosynthesis.
Source:	PubMed, pmid15169397
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