0000000000681605
AUTHOR
H. Sergolle
Decay properties of very-high-spin states in transitional Er nuclei aroundA=154
Theγ ray continuum structures of the transitional Er isotopes withA∼154 are studied using the reaction74Ge(84Kr,xn)158−xEr atElab=340 MeV. The measurements include energy spectra, total energies, multiplicities, angular distributions and lifetimes using the DSAM method. The analysis of data confirms the previously observed two-bump structure of the continuum radiation. A meticulous subtraction of discrete contributions proves the persistence of the low-energy bump even at high spins, i.e.I>40ħ. The angular-distribution measurements assign predominant dipole structure to the bump atEγ=0.65 MeV, whereas the bump atEγ=1.3 MeV is of almost pure quadrupole character at high spins. The lifetime m…
g-Factor of theT 1/2=35 ns isomeric state in154Er
The reaction32S+126Te has been used to determine theg-factor of theT 1/2=35 ns yrast isomeric state in154Er through the time-differential spin-rotation method. The experimental valueg=+0.017±0.003 agrees with an aligned two-neutron ν(i13/2,h9/2) main configuration and supports an 11− spin-parity assignment for the isomeric state. Unambiguous spin-parity assignment for upper energy yrast states can be deduced. The properties of the isomeric state are discussed.
The g-factor of the J?=12+ isomeric state in188Hg
Using the reaction175Lu(19F, 6n) theg-factor of the188Hg isomeric state (Jπ=12+,T1/2=135 ns) has been measured with the TDPAD method. The experimental value g=−0.168(10) supports the interpretation of an almost pure (vi13/2)−2 configuration for this isomer.