C. J. McKay

Fermionic-bosonic couplings in a weakly deformed odd-mass nucleus, {sub 41}{sup 93}Nb

A comprehensive level scheme of {sup 93}Nb below 2 MeV has been constructed from information obtained with the {sup 93}Nb(n,n{prime}{gamma}) and the {sup 94}Zr(p,2n{gamma}{gamma}){sup 93}Nb reactions. Branching ratios, lifetimes, transition multipolarities, and spin assignments have been determined. From M1 and E2 strengths, fermionic-bosonic excitations of isoscalar and isovector characters have been identified from the weak couplings of the {pi}1g{sub 9/2} {circle_times} {sub 40}{sup 92}Zr and {pi}2p{sub 1/2}{sup -1} {circle_times} {sub 42}{sup 94}Mo configurations. A microscopic interpretation of such excitations is obtained from shell-model calculations, which use low-momentum effective interactions.

Isospin purity in the A=42 isobars

The lifetime of the first 2T=1+ state in 42Sc has been measured as 74(16) fs. This result gives a value for the isoscalar matrix element of M0=6.63(76). From the mirror nuclei, 42Ca and 42Ti, the isoscalar matrix element is given as 7.15(48) W.u., confirming isospin purity in the A=42 isobars.

Mixed‐Symmetry States in 96Mo

Mixed‐symmetry states in 96Mo have been identified using the (n,n′γ) reaction. From the lifetime measured using the Doppler‐shift attenuation method and multipole mixing ratios, B(E2) and B(M1) values were determined. The 2ms+ state was found at 2095.77 keV with B(M1: 2ms+ → 21+) = 0.18μN2, while the 1ms+ strength lies primarily in states at 2794.45 and 3300.23 keV.