Enhanced collectivity in 12Be

C. Morse; E.A. McCutchan; H. Iwasaki; C.J. Lister; V.M. Bader; D. Bazin; S. Beceiro Novo; P. Chowdhury; A. Gade; T.D. Johnson; C. Loelius; E. Lunderberg; E. Merchan; V.S. Prasher; F. Recchia; A.A. Sonzogni; D. Weisshaar; K. Whitmore

Physics Letters B (May 2018)

Enhanced collectivity in 12Be

C. Morse,
E.A. McCutchan,
H. Iwasaki,
C.J. Lister,
V.M. Bader,
D. Bazin,
S. Beceiro Novo,
P. Chowdhury,
A. Gade,
T.D. Johnson,
C. Loelius,
E. Lunderberg,
E. Merchan,
V.S. Prasher,
F. Recchia,
A.A. Sonzogni,
D. Weisshaar,
K. Whitmore

Affiliations

C. Morse: Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA; Corresponding author at: 1 University Ave, Lowell, MA 01854, USA.
E.A. McCutchan: National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA
H. Iwasaki: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
C.J. Lister: Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
V.M. Bader: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
D. Bazin: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
S. Beceiro Novo: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
P. Chowdhury: Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
A. Gade: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
T.D. Johnson: National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA
C. Loelius: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
E. Lunderberg: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA
E. Merchan: Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
V.S. Prasher: Department of Physics, University of Massachusetts Lowell, Lowell, MA 01854, USA
F. Recchia: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
A.A. Sonzogni: National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA
D. Weisshaar: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA
K. Whitmore: National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA; Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA

Journal volume & issue: Vol. 780
pp. 227 – 232

Abstract

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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

Published in Physics Letters B

ISSN: 0370-2693 (Print); 1873-2445 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/physics-letters-b/

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