Gamma-decay of the deeply-bound hole states populated in the 102Pd(3He,α)101Pd reaction at 70 MeV

The γ-decay of deeply-bound hole states in 101Pd formed in the 102Pd(3He,α) reaction at 70MeV has been studied. The sharp peak at Ex=2.4 MeV containing a large fraction of the hole strength decays to the state at 0.261 MeV with an M1-E2 mixing ratio δ=−0.35−0.15+0.12. The broad bump around Ex=4 MeV with Γ ap; 1 MeV decays statistically indicating the complete spreading of the hole strength over the underlying non-collective states

Low-lying octupole strength in 112Cd

The low-lying octupole strength distribution in 112Cd has been measured by means of inelastic proton scattering. A splitting of the strength has been observed and interpreted as due to the interaction between the quadrupole and octupole degrees of freedom. The splitting can be reproduced by the IBA-1 model if the coupling of f- and d-bosons is considered

Evidence for shape coexistence in odd-mass rhodium nuclei

Results from the study of the ‘@‘Ru (‘He, d) “‘Rh reaction reveal evidence for shape coexistence in odd-mass rhodium isotopes. The strongly excited states at 786, 806, 969, 1019 and 1355 keV in “‘Rh are good candidates for a rotational-like positive-parity band with J”= l/2+, 3/2+, 5/2+, 7/2+ and 9/2+, respectively, coexisting with spherical shell-model states like lg92 2p12 2p32 and lf52 as well as core-coupled configurations

Quadrupole core polarization charges in the A=100 and 150 mass regions

The neutron and proton quadrupole core polarization charges are evaluated from the comparison of 0gs+ → 21+ quadrupole transition matrix elements measured by inelastic scattering of different incident probes on Mo, Pd, Cd, Nd, Sm, Gd and Dy isotopes. The resulting values, and in particular those obtained in the framework of the interacting boson model, are discussed with special attention to the evaluation of the strength of low-lying mixed-symmetry states

Quadrupole boson structure form factors for proton scattering from the IBA model and electron scattering

Inelastic proton scattering from 110Pd has been measured at Ep = 30.7 MeV. Angular distributions for three low-lying 2+ states are satisfactorily reproduced by employing reduced matrix elements from the IBA model and form factors evaluated from two quadrupole transition charge densities (determined from electron scattering) folded with a nucleon—nucleon interaction. The relative phase between these two transition charge densities could be determined because of coupled channel effects in inelastic proton scattering. This leads to boson structure form factors for proton scattering resembling a Woods-Saxon first derivative for the d-boson non-conserving part and a Woods-Saxon second derivative with a reduced radius for the d-boson conserving part

Chia-Yang Chen, clarinet

Max RegerKrzysztof PendereckiPaul PierneRoberto SierraGeorge Gershwi

Superdeformed rotational bands in Pu-240

The intermediate structure of the fission resonances has been observed in Pu-240. A resonance structure found around the excitation energy of 4.5 MeV was interpreted as a group of K-pi = 0(+) superdeformed rotational bands. The moments of inertia and level density distributions were also deduced for the individually observed band-heads

Quadrupole mixed-symmetry states in 106Pd

The isoscalar and isovector parts of the quadrupole transition matrix elements for the direct Ogs+→2i+ excitation of low-lying 2+ states in 106Pd are derived from the inelastic scattering of deuterons and of polarized protons. The isovector component for the 2+ level at 3.070 MeV exceeds significantly the isoscalar one. This level is therefore identified as a mixed-symmetry state in the language of the neutron and proton interacting boson model (IBA-2)