Neutron knockout of ${}^{12}{Be}$ populating neutron-unbound states in ${}^{11}{Be}$

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Open Access

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31 May 2011

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 83 (5) , 057304
DOI:10.1103/physrevc.83.057304

Abstract

Neutron-unbound resonant states of

{}^{11}{Be}

were populated in neutron knockout reactions from

{}^{12}{Be}

and identified by

{}^{10}{Be}

–

n

coincidence measurements. A resonance in the decay-energy spectrum at 80(2) keV was attributed to a highly excited unbound state in

{}^{11}{Be}

at 3.949(2) MeV decaying to the

2^{+}

excited state in

{}^{10}{Be}

. A knockout cross section of 15(3) mb was inferred for this 3.949(2) MeV state, suggesting a spectroscopic factor near unity for this

0 p 3 / 2^{-}

level, consistent with the detailed shell model calculations.

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Funding Information

National Science Foundation

This publication has 24 references indexed in Scilit:

Properties of ¹²Be and ¹¹Be in terms of single-particle motion in deformed potential
Journal of Physics G: Nuclear and Particle Physics, 2007
Structure of ${}^{12}{Be}$ : Intruder $d$ -Wave Strength at $N = 8$
Physical Review Letters, 2006
Construction of a modular large-area neutron detector for the NSCL
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
Cluster structure in stable and unstable nuclei
The European Physical Journal A, 2005
Study of 11Be structure through β-delayed decays from polarized 11Li
Physics Letters B, 2005
MoNA—The Modular Neutron Array
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003
Direct Evidence for the Breakdown of the $N = 8$ Shell Closure in ${}^{12}B e$
Physical Review Letters, 2000
Single neutron emission following 11Li β-decay
Nuclear Physics A, 1997
β-spectroscopy of 11Li and 14Be —With a β-n-γ triple coincidence method
Nuclear Physics A, 1997
Energy levels of light nuclei A = 11−12
Nuclear Physics A, 1990