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Title: New measurement of the lifetime of the 2 + 1 state of 12Be

The lifetime of the $$2_1^+$$ state at 2.1 MeV in $$^{12}$$Be has been measured using inelastic scattering of a $$^{12}$$Be beam at 43 MeV/nucleon with a gold target. Through the Doppler shift attenuation method, the mean-life of the $$2_1^+$$ state has been determined as 2.5±0.7(stat)±0.3 (syst) ps, which gives a B(E2; $$2_1^+$$ → $$0_{g.s.}^+$$)) value of 4.9±1.3±0.5 in Weisskopf units. The result shows a large quadrupole strength in the ground state transition, providing further evidence on the disappearance of the N=8 magic number. The B(E2; $$2_1^+$$ → $$0_{g.s.}^+$$) value together with the deformation length measured by proton inelastic scattering yields a neutron quadrupole matrix element two times larger than those for $$^{14}$$C and $${16}$$O.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [3] ;  [4] ;  [4] ;  [1] ;  [3] ;  [2] ;  [3] ;  [3] ;  [1] ;  [1] ;  [4] ;  [2] ;  [4] ;  [3]
  1. Univ. of Massachusetts, Lowell, MA (United States). Dept. of Physics
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). National Nuclear Data Center
  3. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab. Dept. of Physics and Astronomy
  4. Michigan State Univ., East Lansing, MI (United States). National Superconducting Cyclotron Lab.
Publication Date:
Report Number(s):
BNL-113845-2017-JA
Journal ID: ISSN 0370-2693; PII: S0370269309002196
Grant/Contract Number:
AC02-98CH10886; FG02-94ER40848; AC02-05CH11231; PHY-1102511
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 673; Journal Issue: 3; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Univ. of Massachusetts, Lowell, MA (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Michigan State Univ., East Lansing, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; lifetimes; nuclear transition probabilities; clustering
OSTI Identifier:
1358025