title: Precise mass measurement of 68Se, a waiting-point nuclide along the rp process.
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.
authors.affiliation: Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Clark
authors.forename: G
authors.initials: G
authors.lastname: Savard
authors.forename: K S
authors.initials: KS
authors.lastname: Sharma
authors.forename: J
authors.initials: J
authors.lastname: Vaz
authors.forename: J C
authors.initials: JC
authors.lastname: Wang
authors.forename: Z
authors.initials: Z
authors.lastname: Zhou
authors.forename: A
authors.initials: A
authors.lastname: Heinz
authors.forename: B
authors.initials: B
authors.lastname: Blank
authors.forename: F
authors.initials: F
authors.lastname: Buchinger
authors.forename: J E
authors.initials: JE
authors.lastname: Crawford
authors.forename: S
authors.initials: S
authors.lastname: Gulick
authors.forename: J K P
authors.initials: JK
authors.lastname: Lee
authors.forename: A F
authors.initials: AF
authors.lastname: Levand
authors.forename: D
authors.initials: D
authors.lastname: Seweryniak
authors.forename: G D
authors.initials: GD
authors.lastname: Sprouse
authors.forename: W
authors.initials: W
authors.lastname: Trimble