arXiv : Study of multi-neutron emission in the $\beta$-decay of $^{11}$Li

Delaunay, F.; Lund, M.V.; Assie, M.; Madurga, M.; Algora, A.; Mendoza, E.; Pestel, V.; Fernandez-Domınguez, B.; Cano-Ott, D.; Balibrea, J.; Marroquin, I.; Orr, N.A.; Banerjee, K.; Parlog, M.; Bhattacharya, C.; Tengblad, O.; Achouri, N.L.; Senoville, M.; Gibelin, J.; Borge, M.J.G.; Fraile, L.M.; Santos, C.; Pereira-Lopez, X.; Vedia, V.; Riisager, K.; Marques, F.M.; Martınez, T.

doi:10.1393/ncc/i2019-19098-5

Article
Report number	arXiv:1906.04699
Title	Study of multi-neutron emission in the $\beta$-decay of $^{11}$Li
Related title	Study of multi-neutron emission in the -decay of 11Li
Author(s)	Delaunay, F. (Caen U.) ; Achouri, N.L. (Caen U.) ; Algora, A. (Valencia U., IFIC) ; Assie, M. (Orsay, IPN) ; Balibrea, J. (Madrid, CIEMAT) ; Banerjee, K. (Calcutta, VECC) ; Bhattacharya, C. (Calcutta, VECC) ; Borge, M.J.G. (CERN ; Madrid, Inst. Estructura Materia) ; Cano-Ott, D. (Madrid, CIEMAT) ; Fernandez-Domınguez, B. (Santiago de Compostela U.) ; Fraile, L.M. (INFN, Milan) ; Gibelin, J. (Caen U.) ; Lund, M.V. (Aarhus U.) ; Madurga, M. (CERN) ; Marques, F.M. (Caen U.) ; Marroquin, I. (Madrid, Inst. Estructura Materia) ; Martınez, T. (Madrid, CIEMAT) ; Mendoza, E. (Madrid, CIEMAT) ; Orr, N.A. (Caen U.) ; Parlog, M. (Caen U.) ; Pereira-Lopez, X. (Caen U. ; Santiago de Compostela U.) ; Pestel, V. (Caen U.) ; Riisager, K. (Aarhus U.) ; Santos, C. (Madrid, CIEMAT) ; Senoville, M. (IRFU, Saclay) ; Tengblad, O. (Madrid, Inst. Estructura Materia) ; Vedia, V. (INFN, Milan)
Publication	2019-03
Imprint	2019-06-11
Number of pages	4
Note	Proceedings of the EuNPC2018 Conference
In:	Nuovo Cimento C 42 (2019) 98
In:	European Nuclear Physics Conference 2018, Bologna, Italy, 2 - 7 Sep 2018, pp.98
DOI	10.1393/ncc/i2019-19098-5
Subject category	nucl-ex ; Nuclear Physics - Experiment
Abstract	The kinematics of two-neutron emission following the $\beta$-decay of $^{11}$Li was investigated for the first time by detecting the two neutrons in coincidence and by measuring their angle and energy. An array of liquid-scintillator neutron detectors was used to reject cosmic-ray and $\gamma$-ray backgrounds by pulse-shape discrimination. Cross-talk events in which two detectors are fired by a single neutron were rejected using a filter tested on the $\beta$-1n emitter $^9$Li. A large cross-talk rejection rate is obtained ($> 95 \%$) over most of the energy range of interest. Application to $^{11}$Li data leads to a significant number of events interpreted as $\beta$-2n decay. A discrete neutron line at $\approx$ 2 MeV indicates sequential two-neutron emission, possibly from the unbound state at 10.6 MeV excitation energy in $^{11}$Be.
Copyright/License	preprint: (License: arXiv nonexclusive-distrib 1.0) publication: (License: CC-BY-4.0)

$Time-of-flight spectra of $^{11}$Li $\beta$-delayed neutrons detected in the near array. Top left: single neutron events. Top right: Multiplicity-2 events before cross-talk rejection. Bottom left: Multiplicity-2 events after cross-talk rejection. Bottom right: Time-of-flight of the second hit $t_2$ \textit{vs.} time-of-flight of the first hit $t_1$, after cross-talk rejection.$ $Time-of-flight spectra of $^{11}$Li $\beta$-delayed neutrons detected in the near array. Top left: single neutron events. Top right: Multiplicity-2 events before cross-talk rejection. Bottom left: Multiplicity-2 events after cross-talk rejection. Bottom right: Time-of-flight of the second hit $t_2$ \textit{vs.} time-of-flight of the first hit $t_1$, after cross-talk rejection.$ $Time-of-flight spectra of $^{11}$Li $\beta$-delayed neutrons detected in the near array. Top left: single neutron events. Top right: Multiplicity-2 events before cross-talk rejection. Bottom left: Multiplicity-2 events after cross-talk rejection. Bottom right: Time-of-flight of the second hit $t_2$ \textit{vs.} time-of-flight of the first hit $t_1$, after cross-talk rejection.$ Show more plots

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