β-delayed charged particles from 9Li and 11Li

doi:10.1016/0375-9474(81)90521-2

Nuclear Physics A

Volume 366, Issue 3, 24 August 1981, Pages 449-460

https://doi.org/10.1016/0375-9474(81)90521-2 Get rights and content

Abstract

β-delayed emission of α-particles from ⁹Li and of both α and ⁶He particles from ¹¹Li is observed. Singles energy spectra and two-dimensional energy spectra of coincident particles are measured. A time-of-flight versus energy measurement is used to identify the mass of the particle. New β-branches are observed which populate high-energy levels in the daughter nuclei. The branching ratios are measured and the β-delayed neutron emission probabilities $P_{n} for^{9} Li and P_{3n} for^{11} Li$ are deduced.

References (17)

R.E. Azuma et al.
Phys. Lett.
(1980)
T. Björnstad et al.
Nucl. Phys.
(1981)
B.E.F. Macefield et al.
Nucl. Phys.
(1969)
Y.S. Chen et al.
Nucl. Phys.
(1970)
S. Cohen et al.
Nucl. Phys.
(1965)
P.R. Christensen et al.
Nucl. Phys.
(1966)
F. Ajzenberg-Selove
Nucl. Phys.
(1979)
J.B.A. England et al.
Nucl. Instr.
(1971)

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

Cited by (48)

Evaluation of Beta-Delayed Neutron Emission Probabilities and Half-Lives for Z = 2-28
2015, Nuclear Data Sheets
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.
Energy levels of light nuclei A=11
2012, Nuclear Physics A
Nuclear Data Sheets for A = 29
2012, Nuclear Data Sheets
Evidence of a new state in 11Be observed in the 11Li β-decay
2009, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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.
Study of β-delayed 3-body and 5-body breakup channels observed in the decay of 11Li
2008, Nuclear Physics A
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.
Low-lying resonance states in the 9Be continuum
2005, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Excited states in ⁹Be from 2 to 9 MeV are studied via beta delayed particle emission from ⁹Li. The broad overlapping particle unbound states are investigated using an extension of an experimental method developed for dealing with three-body decays of broad isolated levels. The results confirm the existence of a broad state at 5 MeV, with a width of 2 MeV. Angular correlations are used for firm spin determinations for this and other levels.

View all citing articles on Scopus

^†: Permanent address: McGill University, Montréal, Québec, Canada.

View full text

Article preview

Nuclear Physics A

Abstract

References (17)

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Cited by (48)

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

Energy levels of light nuclei A=11

Nuclear Data Sheets for A = 29

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

Low-lying resonance states in the <sup>9</sup>Be continuum