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

arXiv: Nuclear Experiment Pub Date : 2018-09-02 DOI:10.1393/NCC/I2019-19098-5

F. Delaunay, N. Achouri, A. Algora, M. Assi'e, J. Balibrea, K. Banerjee, C. Bhattacharya, M. Borge, D. Cano-Ott, B. Fern'andez-Dom'inguez, L. Fraile, J. Gibelin, M. Lund, M. Madurga, F. Marqu'es, I. Marroquı́n, T. Mart'inez, E. Mendoza, N. Orr, M. Pârlog, X. Pereira-L'opez, V. Pestel, K. Riisager, C. Santos, M. Sénoville, O. Tengblad, V. Vedia

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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.

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$^{11}$Li $\beta$衰变中多中子发射的研究

本文首次研究了$^{11}$ Li在$\beta$ -衰变后的双中子发射的运动学，方法是对重合的两个中子进行探测，并测量它们的角度和能量。利用一组液体闪烁体中子探测器，通过脉冲形状判别来抑制宇宙射线和$\gamma$射线背景。使用在$\beta$ -1n发射极$^9$ Li上测试的滤波器，排除了由单个中子发射两个探测器的串扰事件。在大部分感兴趣的能量范围内，获得了很大的串扰抑制率($> 95 \%$)。对$^{11}$ Li数据的应用导致大量事件被解释为$\beta$ -2n衰减。在$\approx$ 2 MeV处的离散中子线表示连续的双中子发射，可能来自$^{11}$ Be中10.6 MeV激发能的未束缚态。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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arXiv: Nuclear Experiment

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