Beta-delayed three-neutron radioactivity of 11Li

doi:10.1016/0370-2693(80)90205-1

Physics Letters B

Volume 96, Issues 1–2, 20 October 1980, Pages 31-34

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Abstract

A new radioactive decay mode, beta-delayed three-neutron emission, has been observed in ¹¹Li in an intensity p_3n = (1.8 ± 0.2)%. The single and double neutron branches have intensities p1_1n = (82 ± 7)% and p_2n = (3.9 ± 0.5_)%.

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There are more references available in the full text version of this article.

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Beta-delayed neutron emission is important for nuclear structure and astrophysics as well as for reactor applications. Significant advances in nuclear experimental techniques in the past two decades have led to a wealth of new measurements that remain to be incorporated in the databases.
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Commissioning of the BRIKEN detector for the measurement of very exotic β-delayed neutron emitters
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We present an evaluation and compilation of β-delayed neutron probabilities and half-lives for nuclei in the region Z = 2–28 (⁸He–⁸⁰Ni). This article includes the recommended values of these quantities as well as a compiled list of experimental measurements for each nucleus in the region for which β-delayed neutron emission is possible. The literature cut-off for this work is August 15^th, 2015. Some notable cases as well as new standards for β-delayed neutron measurements in this mass region are also discussed.
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Evidence of a new state in 11Be observed in the 11Li β-decay
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Coincidences between charged particles emitted in the β-decay of ¹¹Li were observed using highly segmented detectors. The breakup channels involving three particles were studied in full kinematics allowing for the reconstruction of the excitation energy of the ¹¹Be states participating in the decay. In particular, the contribution of a previously unobserved state at 16.3 MeV in ¹¹Be has been identified selecting the $α + {}^{7}{He} \to α + {}^{6}{He} + n$ channel. The angular correlations between the α particle and the center of mass of the ⁶He + n system favors spin and parity assignment of $3 / 2^{-}$ for this state as well as for the previously known state at 18 MeV.
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The β-delayed charged particle emission from ¹¹Li has been studied with emphasis on the three-body nα⁶He and five-body 2α3n channels from the 10.59 and 18.15 MeV states in ¹¹Be. Monte Carlo simulations using an R-matrix formalism lead to the conclusion that the ^AHe resonance states play a significant role in the break-up of these states. The results exclude an earlier assumption of a phase-space description of the break-up process of the 18.15 MeV state. Evidence for extra sequential decay paths is found for both states.

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¹: On leave from Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA.

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Physics Letters B

Abstract

References (9)

Phys. Lett.

Nucl. Phys.

Phys. Rev. Lett.

Phys. Rev.

Cited by (50)

Development of a Reference Database for Beta-Delayed Neutron Emission

Commissioning of the BRIKEN detector for the measurement of very exotic β-delayed neutron emitters

Evaluation of Beta-Delayed Neutron Emission Probabilities and Half-Lives for Z = 2-28

Energy levels of light nuclei A=11

Evidence of a new state in <sup>11</sup>Be observed in the <sup>11</sup>Li β-decay

Study of β-delayed 3-body and 5-body breakup channels observed in the decay of <sup>11</sup>Li