title: Experiments with thermalized rare isotope beams from projectile fragmentation: a precision mass measurement of the superallowed beta emitter 38Ca.
abstract: The mass of the short-lived radio nuclide 38Ca (T(1/2) = 440 ms) has been measured with the 9.4-T Penning trap mass spectrometer of the Low-Energy Beam and Ion Trap Facility. A mass uncertainty of deltam = 280 eV has been achieved, corresponding to deltam/m = 8 x 10(-9). The result makes 38Ca, a superallowed beta emitter, a new candidate to test the conserved-vector-current hypothesis. The experiment is also the first demonstration that short-lived radioactive isotopes produced by projectile fragmentation of relativistic heavy-ion beams can be slowed down and prepared such that precision experiments of this kind are possible.
authors.affiliation: National Superconducting Cyclotron Laboratory. Michigan State University, East Lansing, Michigan, USA. bollen@nscl.msu.edu
authors.forename: G
authors.initials: G
authors.lastname: Bollen
authors.forename: D
authors.initials: D
authors.lastname: Davies
authors.forename: M
authors.initials: M
authors.lastname: Facina
authors.forename: J
authors.initials: J
authors.lastname: Huikari
authors.forename: E
authors.initials: E
authors.lastname: Kwan
authors.forename: P A
authors.initials: PA
authors.lastname: Lofy
authors.forename: D J
authors.initials: DJ
authors.lastname: Morrissey
authors.forename: A
authors.initials: A
authors.lastname: Prinke
authors.forename: R
authors.initials: R
authors.lastname: Ringle
authors.forename: J
authors.initials: J
authors.lastname: Savory
authors.forename: P
authors.initials: P
authors.lastname: Schury
authors.forename: S
authors.initials: S
authors.lastname: Schwarz
authors.forename: C
authors.initials: C
authors.lastname: Sumithrarachchi
authors.forename: T
authors.initials: T
authors.lastname: Sun
authors.forename: L
authors.initials: L
authors.lastname: Weissman