title: Clarification of the three-body decay of 12C (12.71 MeV).
abstract: Using beta decays of a clean source of 12N produced at the IGISOL facility, we have measured the breakup of the 12C (12.71 MeV) state into three alpha particles with a segmented particle detector setup. The high quality of the data permits solving the question of the breakup mechanism of the 12.71 MeV state, a longstanding problem in few-body nuclear physics. Among existing models, a modified sequential model fits the data best, but systematic deviations indicate that a three-body description is needed.
authors.affiliation: Institut for Fysik og Astronomi, Aarhus Universitet, DK-8000 Aarhus C, Denmark. fynbo@phys.au.dk
authors.forename: H O U
authors.initials: HO
authors.lastname: Fynbo
authors.forename: Y
authors.initials: Y
authors.lastname: Prezado
authors.forename: U C
authors.initials: UC
authors.lastname: Bergmann
authors.forename: M J G
authors.initials: MJ
authors.lastname: Borge
authors.forename: P
authors.initials: P
authors.lastname: Dendooven
authors.forename: W X
authors.initials: WX
authors.lastname: Huang
authors.forename: J
authors.initials: J
authors.lastname: Huikari
authors.forename: H
authors.initials: H
authors.lastname: Jeppesen
authors.forename: P
authors.initials: P
authors.lastname: Jones
authors.forename: B
authors.initials: B
authors.lastname: Jonson
authors.forename: M
authors.initials: M
authors.lastname: Meister
authors.forename: G
authors.initials: G
authors.lastname: Nyman
authors.forename: K
authors.initials: K
authors.lastname: Riisager
authors.forename: O
authors.initials: O
authors.lastname: Tengblad
authors.forename: I S
authors.initials: IS
authors.lastname: Vogelius
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: L
authors.initials: L
authors.lastname: Weissman
authors.forename: K
authors.initials: K
authors.lastname: Wilhelmsen Rolander
authors.forename: J
authors.initials: J
authors.lastname: Aystö