title: Tensor interaction limit derived from the α-β-ν[over ¯] correlation in trapped 8Li ions.
abstract: A measurement of the α-β-ν[over ¯] angular correlation in the Gamow-Teller decay (8)Li→(8)Be(*)+ν[over ¯]+β, (8)Be(*)→α+α has been performed using ions confined in a linear Paul trap surrounded by silicon detectors. The energy difference spectrum of the α particles emitted along and opposite the direction of the β particle is consistent with the standard model prediction and places a limit of 3.1% (95.5% confidence level) on any tensor contribution to the decay. From this result, the amplitude of any tensor component C(T) relative to that of the dominant axial-vector component C(A) of the electroweak interaction is limited to |C(T)/C(A)|<0.18 (95.5% confidence level). This experimental approach is facilitated by several favorable features of the (8)Li β decay and has different systematic effects than the previous β-ν[over ¯] correlation results for a pure Gamow-Teller transition obtained from studying (6)He β decay.
authors.affiliation: Department of Physics, McGill University, Montréal, Quebéc H3A 2T8, Canada.
authors.forename: G
authors.initials: G
authors.lastname: Li
authors.forename: R
authors.initials: R
authors.lastname: Segel
authors.forename: N D
authors.initials: ND
authors.lastname: Scielzo
authors.forename: P F
authors.initials: PF
authors.lastname: Bertone
authors.forename: F
authors.initials: F
authors.lastname: Buchinger
authors.forename: S
authors.initials: S
authors.lastname: Caldwell
authors.forename: A
authors.initials: A
authors.lastname: Chaudhuri
authors.forename: J A
authors.initials: JA
authors.lastname: Clark
authors.forename: J E
authors.initials: JE
authors.lastname: Crawford
authors.forename: C M
authors.initials: CM
authors.lastname: Deibel
authors.forename: J
authors.initials: J
authors.lastname: Fallis
authors.forename: S
authors.initials: S
authors.lastname: Gulick
authors.forename: G
authors.initials: G
authors.lastname: Gwinner
authors.forename: D
authors.initials: D
authors.lastname: Lascar
authors.forename: A F
authors.initials: AF
authors.lastname: Levand
authors.forename: M
authors.initials: M
authors.lastname: Pedretti
authors.forename: G
authors.initials: G
authors.lastname: Savard
authors.forename: K S
authors.initials: KS
authors.lastname: Sharma
authors.forename: M G
authors.initials: MG
authors.lastname: Sternberg
authors.forename: T
authors.initials: T
authors.lastname: Sun
authors.forename: J
authors.initials: J
authors.lastname: Van Schelt
authors.forename: R M
authors.initials: RM
authors.lastname: Yee
authors.forename: B J
authors.initials: BJ
authors.lastname: Zabransky