Probing the nature of particle-core couplings in Ca-49 with gamma spectroscopy and heavy-ion transfer reactions

作者：Montanari D; Leoni S^*; Mengoni D; Benzoni G; Blasi N; Bocchi G; Bortignon P F; Bracco A; Camera F; Colo G; Corsi A; Crespi F C L; Million B; Nicolini R; Wieland O; Valiente Dobon J J; Corradi L; de Angelis G; Della Vedova F; Fioretto E; Gadea A; Napoli D R; Orlandi R; Recchia F; Sahin E; Silvestri R; Stefanini A M; Singh R P; Szilner S; Bazzacco D; Farnea E; Menegazzo R; Gottardo A; Lenzi S M; Lunardi S; Montagnoli G

来源：Physics Letters B, 2011, 697(4): 288-293.

DOI：10.1016/j.physletb.2011.01.046

• Multi-nucleon transfer
• Gamma spectroscopy
• Magnetic spectrometer
• Particle-core coupling

Neutron rich nuclei around Ca-48 have been measured with the CLARA-PRISMA setup, making use of Ca-48 on Ni-64 binary reactions, at 5.9 MeV/A. Angular distributions of gamma rays give evidence, in several transfer channels, for a large spin alignment (approximate to 70%) perpendicular to the reaction plane, making it possible to firmly establish spin and parities of the excited states. In the case of Ca-49, states arising from different types of particle-core couplings are, for the first time, unambiguously identified on basis of angular distribution, polarization and lifetime measurements. Shell model and particle-vibration coupling calculations are used to pin down the nature of the states. Evidence is found for the presence, in the same excitation energy region, of two types of coupled states, i.e. single particle coupled to either Ca-48 or Ca-50 simple configurations, and particle-vibration coupled states based on the 3- phonon of Ca-48.

• 出版日期2011-3-14