1. Chronology of the three-body dissociation of 8He.
- Author
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B Laurent, F M Marqués, C Angulo, N I Ashwood, M J G Borge, V Bouchat, W N Catford, N M Clarke, N Curtis, M Freer, F Hanappe, V Kinnard, M Labiche, T Materna, P McEwan, T Nilsson, A Ninane, G Normand, N A Orr, and S D Pain
- Subjects
THREE-body problem ,HELIUM isotopes ,NEUTRONS ,GROUND state energy ,PHENOMENOLOGICAL theory (Physics) - Abstract
The space and time configurations of the dissociation of
8 He into6 He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and6 He-n channels are successfully described within a model that considers independent emission of neutrons from a Gaussian volume with a given lifetime. The dissociation on C target exhibits a dominant sequential decay through the ground state of7 He, consistent with neutrons being emitted from a Gaussian volume of fm with a n-n delay in the sequential channel of 1400 ± 400 fm/c, in agreement with the lifetime of7 He. The lower-statistics data on Pb target correspond mainly to direct breakup, and are well described using the n-n volume measured, without any n-n delay. The validity of the phenomenological model used is discussed. [ABSTRACT FROM AUTHOR]- Published
- 2019
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