Search

Various alternative models were used to describe the structure of 106Ru . For example, the General Collective Model (GCM) predicts shape-coexistence for 106Ru with a spherical and a triaxial minimum and strongly mixed structures, while in the IBA-2 calculations, where 106Ru was considered as transitional from vibrational U(5) to γ -soft O(6) , no need was found to include the shape-coexisting configurations. In order to provide additional constraints on the model interpretations, we have applied the Advanced Time-Delayed (ATD) βγγ( t) method to measure the level lifetimes of the excited levels in 106Ru . The new results include the half-lives of T 1/2 = 183(3) ps and 7.5(30)ps for the 2+ 1 and 2+ 2 states, respectively. [ABSTRACT FROM AUTHOR]

Exotic, neutron-rich proton-induced spallation products of 232Th and 238U obtained from the PS Booster ISOLDE facility have been investigated by `γ-γα-γ coincidence and spectrum-multiscaling measurements. A new method for the reduction of isobaric contamination enabled to study the unknown region beyond208Pb for the decay chain A= 217. A new isotope 217Bi with a half-life of 98.5 ± 0.8 s was discovered and its $-decay studied. For the first time, a half-life value of 1.53 ± 0.03 s for the a-decay of was measured. [ABSTRACT FROM AUTHOR]

A new high-spin isomer in 215Bi, with a half-life of 36.9(6) s, has been identified at the PSB- ISOLDE on-line mass separator using the pulsed-release technique combined with the element selective R1LIS source. A decay scheme of 215mBi was constructed and complemented with the low-spin structure observed in 215g Bi decay. The population of a cascade on top of the (vg9 /2)59/2+ level in 215Po provides evidence for Gamow-Teller β-decay of the high-spin 215Bi isomer. [ABSTRACT FROM AUTHOR]

At the Jyväskylä IGISOL facility, different ion guide designs are used for different types of reactions. The performance of these ion guides is summarized. The limitations for performing nuclear decay studies and collinear laser spectroscopy due to the large beam energy spread and the presence of isobars will be removed after the installation of an ion beam cooler to reduce the energy spread and a longitudinal penning trap for performing isobaric mass separation. These new developments will bring the capabilities of the IGISOL facility to a new level. [ABSTRACT FROM AUTHOR]

We report on the progress of the collinear laser spectroscopy programme at the IGISOL isotope separator in Jyväskylä. The sensitivity of the photon-ion coincidence tecnique has been sufficient to measure isotope shifts and hyperfine structures of light hafnium isotopes produced in 175Lu(p, xn) reactions. A gas-filled RF quadrupole has recently been installed in the beamline to reduce the energy spread and emittance of the ion beam. It is expected to increase the sensitivity of the laser technique by at least an order of magnitude, allowing measurements on a number of high-spin isomers in the hafnium chain. [ABSTRACT FROM AUTHOR]