title: Narrow spin resonance width and spin flip with an rf-bunched deuteron beam.
abstract: We used an rf solenoid to study the widths of rf spin resonances with both bunched and unbunched beams of 1.85 GeV/c polarized deuterons stored in the COSY synchrotron. With the unbunched beam at different fixed rf-solenoid frequencies, we observed only partial depolarization near the resonance. However, the bunched beam's polarization was almost fully flipped; moreover, its resonance was much narrower. We then used Chao's recent equations to explain this behavior and to calculate the polarization's dependence on various rf-solenoid and beam parameters. Our data and calculations indicate that a bunched deuteron beam's polarization can behave as if the beam has zero momentum spread.
authors.affiliation: Spin Physics Center, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors.forename: V S
authors.initials: VS
authors.lastname: Morozov
authors.forename: A W
authors.initials: AW
authors.lastname: Chao
authors.forename: A D
authors.initials: AD
authors.lastname: Krisch
authors.forename: M A
authors.initials: MA
authors.lastname: Leonova
authors.forename: R S
authors.initials: RS
authors.lastname: Raymond
authors.forename: D W
authors.initials: DW
authors.lastname: Sivers
authors.forename: V K
authors.initials: VK
authors.lastname: Wong
authors.forename: A M
authors.initials: AM
authors.lastname: Kondratenko