Multinucleon transfer cross sections in the (96)Zr+(40)Ca system have been measured,in inverse kinematics,at bombarding energies ranging from the Coulomb barrier to similar to 25% below. Targetlike recoils have been identified in A,Z and velocity with the large solid angle magnetic spectrometer PRISMA. The experimental data for one- and two-neutron transfer channels have been compared with semiclassical microscopic calculations. For the two-neutron transfer channels the relevance of the transitions to the ground state and to the 0(+) excited states of (42)Ca are discussed by employing,for the reaction mechanism,the successive approximation. It is found that the transition to the 0(+) state at similar to 6 MeV,whose wave function is dominated by the two neutrons in the 2p(3/2) shell,is much larger than the ground state one. The comparison with the inclusive data reveals that transitions to states with high multipolarity and non-natural parity are important. This suggests that more complex two-particle correlations have to be incorporated in the treatment of the transfer process.
Single and pair neutron transfers at sub-barrier energies
MONTAGNOLI, GIOVANNA;SCARLASSARA, FERNANDO;
2011
Abstract
Multinucleon transfer cross sections in the (96)Zr+(40)Ca system have been measured,in inverse kinematics,at bombarding energies ranging from the Coulomb barrier to similar to 25% below. Targetlike recoils have been identified in A,Z and velocity with the large solid angle magnetic spectrometer PRISMA. The experimental data for one- and two-neutron transfer channels have been compared with semiclassical microscopic calculations. For the two-neutron transfer channels the relevance of the transitions to the ground state and to the 0(+) excited states of (42)Ca are discussed by employing,for the reaction mechanism,the successive approximation. It is found that the transition to the 0(+) state at similar to 6 MeV,whose wave function is dominated by the two neutrons in the 2p(3/2) shell,is much larger than the ground state one. The comparison with the inclusive data reveals that transitions to states with high multipolarity and non-natural parity are important. This suggests that more complex two-particle correlations have to be incorporated in the treatment of the transfer process.Pubblicazioni consigliate
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