Anomalous Crossing Frequency in Odd Proton Nuclei

A generic explanation for the recently observed anomalous crossing frequencies in odd proton rare earth nuclei is given. As an example, the proton ${1\over 2} [541]$ band in $^{175}$Ta is discussed in detail by using the angular momentum projection theory. It is shown that the quadrupole pairing interaction is decisive in delaying the crossing point and the changes in crossing frequency along the isotope chain are due to the different neutron shell fillings

Spin-rotor Interpretation of Identical Bands and Quantized Alignment in Superdeformed A ≈\approx 190 Nuclei

The ``identical'' bands in superdeformed mercury, thallium, and lead nuclei are interpreted as examples of orbital angular momentum rotors with the weak spin-orbit coupling of pseudo-$SU(3)$ symmetries and supersymmetries.Comment: 15 pages, revtex 3.0, 7 figures available upon request from [email protected]

Extremely long lived 65- 2 isomer in 213Fr

An isomeric state with a mean life of 4.5(2) μs and a spin of 65- 2 has been observed in Fr at an excitation energy of 8095 keV. A g-factor of 0.695(7) was measured for this state using the TDPAD method. The properties of this isomer agree very well with predictions of semi empirical shell model calculations when coupling to the 3 octupole vibration are included