Chronology of the three-body dissociation of 8He

The space and time configurations of the dissociation of 8He into 6He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and 6He-n channels are successfully described within a model that considers independent emission of neutrons f...

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Bibliographic Details
Published in:Journal of physics. G, Nuclear and particle physics Nuclear and particle physics, 2019-02, Vol.46 (3)
Main Authors: Laurent, B, Marqués, F M, Angulo, C, Ashwood, N I, Borge, M J G, Bouchat, V, Catford, W N, Clarke, N M, Curtis, N, Freer, M, Hanappe, F, Kinnard, V, Labiche, M, Materna, T, McEwan, P, Nilsson, T, Ninane, A, Normand, G, Orr, N A, Pain, S D, Prokhorova, E, Stuttgé, L, Timis, C
Format: Article
Language:English
Subjects:
halo nuclei
neutron correlations
three-body decays
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Summary:The space and time configurations of the dissociation of 8He into 6He+n+n, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the n-n and 6He-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 of 7He, consistent with neutrons being emitted from a Gaussian volume of r nn rms = 7.3 0.6 fm with a n-n delay in the sequential channel of 1400 400 fm/c, in agreement with the lifetime of 7He. 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.
ISSN:0954-3899
1361-6471
DOI:10.1088/1361-6471/ab02c3