| Article | |
| Report number | arXiv:1801.01333 |
| Title | Chronology of the three-body dissociation of $^8$He |
| Author(s) | Laurent, B. (Caen U.) ; Marqués, F.M. (Caen U.) ; Angulo, C. (Cathol. U. Louvain (main)) ; Ashwood, N.I. (Birmingham U.) ; Borge, M.J.G. (CSIC, Madrid) ; Bouchat, V. (U. Brussels (main)) ; Catford, W.N. ; Clarke, N.M. (Birmingham U.) ; Curtis, N. (Birmingham U.) ; Freer, M. (Birmingham U.) ; Hanappe, F. (U. Brussels (main)) ; Kinnard, V. (U. Brussels (main)) ; Labiche, M. (West Scotland U.) ; Materna, T. (U. Brussels (main)) ; McEwan, P. (Birmingham U.) ; Nilsson, T. (CERN) ; Ninane, A. (Cathol. U. Louvain (main)) ; Normand, G. (Caen U. ; GANIL) ; Orr, N.A. (Caen U.) ; Pain, S.D. (Surrey U.) ; Prokhorova, E. (U. Brussels (main)) ; Stuttgé, L. (Strasbourg, IPHC) ; Timis, C. (Surrey U.) |
| Publication | 2019-02-12 |
| Imprint | 2018-01-04 |
| Number of pages | 11 |
| Note | Accepted for publication in J. Phys. G, 11 pages, 5 figures |
| In: | J. Phys. G 46 (2019) 03LT02 |
| DOI | 10.1088/1361-6471/ab02c3 (publication) |
| Subject category | nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment |
| Abstract | The space and time configurations of the dissociation of $^8$He into $^6$He+$n$+$n$, on C and Pb targets, have been explored simultaneously for the first time. The final-state interactions in the $n$-$n$ and $^6$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 of $^7$He, consistent with neutrons being emitted from a Gaussian volume of $r_{nn}^{\rm{rms}}=7.3\pm0.6$ fm with a $n$-$n$ delay in the sequential channel of $1400\pm400$ fm/$c$, in agreement with the lifetime of $^7$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. |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) License |
Corresponding record in: Inspire
Record created 2019-02-21, last modified 2024-05-08