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Phys Rev Lett. 2011 Sep 2;107(10):102501. Epub 2011 Aug 30.

Lifetime measurement of the 2(1)+ state in 20C.

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Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.


Establishing how and when large N/Z values require modified or new theoretical tools is a major quest in nuclear physics. Here we report the first measurement of the lifetime of the 2(1)+ state in the near-dripline nucleus 20C. The deduced value of τ(2(1)+)=9.8±2.8(stat)(-1.1)(+0.5)(syst)  ps gives a reduced transition probability of B(E2; 2(1)+→0(g.s.)+)=7.5(-1.7)(+3.0)(stat)(-0.4)(+1.0)(syst)  e2  fm4 in good agreement with a shell model calculation using isospin-dependent effective charges.

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