Mass Measurement on the rp-Process Waiting Point $^{72}Kr
- Rodriguez, D.
- S. Kolhinen, V.
- Audi, G.
- Aysto, J.
- Beck, D.
- Blaum, K.
- Bollen, G.
- Herfurth, F.
- Jokinen, A.
- Kellerbauer, A.
- J. Kluge, H.
- Oinonen, M.
- Schatz, H.
- Sauvan, E.
- Schwarz, S.
Publication date
January 2004
DOI Publisher
American Physical Society (APS)Abstract
The mass of one of the three major waiting points in the astrophysical rp process $^{72}$Kr was measured for the first time with the Penning trap mass spectrometer ISOLTRAP. The measurement yielded a relative mass uncertainty of $\deltam/m = 1.2\times 10–7 (\deltam$ = 8 keV). $^{73,74}$Kr, also needed for astrophysical calculations, were measured with more than 1 order of magnitude improved accuracy. We use the ISOLTRAP masses of $^{72–74}$Kr to reanalyze the role of $^{72}$Kr (T$_{1/2}$ = 17.2 s) in the rp process during x-ray bursts and conclude that $^{72}$Kr is a strong waiting point delaying the burst duration with at least 80\% of its $\beta$-decay half-life
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