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The lifetime of the 21+ 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 21+ state has been determined as 2.5±0.7 (stat) ±0.3 (syst) ps, which gives a B(E2;21+→0g.s.+) value of 4.9±1.3±0.5 in Weisskopf units. The result shows a large quadrupole...
An isomeric 0 + state in 12 Be was found at E x =2.24 MeV. The isomer was identified by measuring coincident two γ-rays from in-flight 12 Be nuclei, 12m Be-> 12 Be * (2 +1 )-> 12 Be g.s. , produced by the projectile fragmentation of 18 O at 100A MeV on...
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