title: First experimental determination of the charge radius of 74Rb and its application in tests of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
abstract: Collinear-laser spectroscopy with the bunched-beams technique was used for the study of neutron deficient Rb isotopes, out to (74)Rb (N = Z = 37) at TRIUMF. The measured hyperfine coupling constants of (76,78m)Rb were in agreement with literature values. The nuclear spin of (75)Rb was confirmed to be I = 3/2, and its hyperfine coupling constants were measured for the first time. The mean-square charge radius of (74)Rb was determined for the first time. This result has improved the isospin symmetry breaking correction term used to calculate the Ft value, with implications for tests of the unitarity of the Cabibbo-Kobayashi-Maskawa matrix.
authors.affiliation: TRIUMF, Vancouver, British Columbia, Canada. Ernesto@triumf.ca
authors.forename: E
authors.initials: E
authors.lastname: Mané
authors.forename: A
authors.initials: A
authors.lastname: Voss
authors.forename: J A
authors.initials: JA
authors.lastname: Behr
authors.forename: J
authors.initials: J
authors.lastname: Billowes
authors.forename: T
authors.initials: T
authors.lastname: Brunner
authors.forename: F
authors.initials: F
authors.lastname: Buchinger
authors.forename: J E
authors.initials: JE
authors.lastname: Crawford
authors.forename: J
authors.initials: J
authors.lastname: Dilling
authors.forename: S
authors.initials: S
authors.lastname: Ettenauer
authors.forename: C D P
authors.initials: CD
authors.lastname: Levy
authors.forename: O
authors.initials: O
authors.lastname: Shelbaya
authors.forename: M R
authors.initials: MR
authors.lastname: Pearson