Elsevier

Physics Letters B

Volume 780, 10 May 2018, Pages 227-232
Physics Letters B

Enhanced collectivity in 12Be

https://doi.org/10.1016/j.physletb.2018.03.004Get rights and content
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Abstract

Electromagnetic quadrupole transition strength is a sensitive probe of the evolution of the structure of nuclei, particularly the competition between collectivity and magicity. We have performed a new lifetime measurement of the 21+ state of 12Be to study the interplay of these phenomena. The lifetime was measured with the Doppler Shift Attenuation Method using the γ-ray detector GRETINA. Excited states of 12Be were produced via inelastic scattering at 55 MeV/nucleon, using several different targets to control for systematic uncertainties in the stopping powers. The lifetime is determined to be τ=1.38±0.10(stat)±0.19(sys) ps, which is about half the previously reported value at twice the precision. The reduced transition strength deduced from this result is B(E2;21+01+)=14.2±1.0(stat)±2.0(sys) e2fm4, which supports the quenching of the N=8 shell gap in 12Be.

Keywords

Lifetimes
Nuclear transition probabilities
Collectivity

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