Lifetimes of low-lying excited states of the neutron-rich 44,46Ar nuclei, populated via multinucleon transfer reactions, are measured by means of the differential recoil distance Doppler shift method. The extracted electromagnetic transition probabilities are compared with previous intermediate-energy Coulomb-excitation measurements and with large-scale shell-model calculations. The increase in the deduced B(E2;2+→0+) transition probability from 44Ar to the closed-shell nucleus 46Ar contradicts the earlier results of Coulomb-excitation experiments. Shell-model calculations using different effective interactions agree with the new measured values.
Lifetime measurements of excited states in neutron-rich Ar-44,Ar-46 populated via a multinucleon transfer reaction
MENGONI, DANIELE;LUNARDI, SANTO;LENZI, SILVIA MONICA;GOTTARDO, ANDREA;MONTANARI, DANIELE;MONTAGNOLI, GIOVANNA;RECCHIA, FRANCESCO;SCARLASSARA, FERNANDO;
2010
Abstract
Lifetimes of low-lying excited states of the neutron-rich 44,46Ar nuclei, populated via multinucleon transfer reactions, are measured by means of the differential recoil distance Doppler shift method. The extracted electromagnetic transition probabilities are compared with previous intermediate-energy Coulomb-excitation measurements and with large-scale shell-model calculations. The increase in the deduced B(E2;2+→0+) transition probability from 44Ar to the closed-shell nucleus 46Ar contradicts the earlier results of Coulomb-excitation experiments. Shell-model calculations using different effective interactions agree with the new measured values.Pubblicazioni consigliate
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