title: Mass measurement on the rp-process waiting point 72Kr.
abstract: The mass of one of the three major waiting points in the astrophysical rp process 72Kr was measured for the first time with the Penning trap mass spectrometer ISOLTRAP. The measurement yielded a relative mass uncertainty of deltam/m=1.2x10(-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 72-74Kr to reanalyze the role of 72Kr (T(1/2)=17.2 s) in the rp process during x-ray bursts and conclude that 72Kr is a strong waiting point delaying the burst duration with at least 80% of its beta-decay half-life.
authors.affiliation: GSI, Darmstadt, Germany. rodriguez@lpccaen.in2p3.fr
authors.forename: D
authors.initials: D
authors.lastname: Rodríguez
authors.forename: V S
authors.initials: VS
authors.lastname: Kolhinen
authors.forename: G
authors.initials: G
authors.lastname: Audi
authors.forename: J
authors.initials: J
authors.lastname: Aystö
authors.forename: D
authors.initials: D
authors.lastname: Beck
authors.forename: K
authors.initials: K
authors.lastname: Blaum
authors.forename: G
authors.initials: G
authors.lastname: Bollen
authors.forename: F
authors.initials: F
authors.lastname: Herfurth
authors.forename: A
authors.initials: A
authors.lastname: Jokinen
authors.forename: A
authors.initials: A
authors.lastname: Kellerbauer
authors.forename: H-J
authors.initials: HJ
authors.lastname: Kluge
authors.forename: M
authors.initials: M
authors.lastname: Oinonen
authors.forename: H
authors.initials: H
authors.lastname: Schatz
authors.forename: E
authors.initials: E
authors.lastname: Sauvan
authors.forename: S
authors.initials: S
authors.lastname: Schwarz