RESUMO
The breaking of the N=8 shell-model magic number in the 12Be ground state has been determined to include significant occupancy of the intruder d-wave orbital. This is in marked contrast with all other N=8 isotones, both more and less exotic than 12Be. The occupancies of the [FORMULA: SEE TEXT]orbital and the [FORMULA: SEE TEXT], intruder orbital were deduced from a measurement of neutron removal from a high-energy 12Be beam leading to bound and unbound states in 11Be.
RESUMO
The 10.15 MeV resonance in 10Be has been probed via resonant 6He+4He elastic scattering. It is demonstrated that it is the Jpi=4+ member of a rotational band built on the 6.18 MeV 0+ state. A Gammaalpha of 0.10-0.13 MeV and Gammaalpha/Gamma=0.35-0.46 were deduced. The corresponding reduced alpha width, gamma2alpha, indicates one of the largest alpha-cluster spectroscopic factors known. The deformation of the band, including the 7.54 MeV, 2+ member, is large (h2/2I=200 keV). Such a deformation and the significant degree of clusterization signals a well-developed alpha:2n:alpha molecular structure.
RESUMO
The actions of drugs interfering with central indolaminergic mechanisms were assessed on the Dopa-induced EEG synchronization in the rat. The increased slow wave activity observed during the first 30 min following Dopa (100 mg/kg) was significantly decreased by p-chlorophenylalanine (400 mg/kg), reserpine (4 and 8 mg/kg) and methysergide (16 mg/kg). Cyproheptadine was ineffective in this respect. Our findings lend support to the hypothesis that the initial synchronization after Dopa is related to the release of 5-hydroxytryptamine.