Multiple β− decaying states in 194Re: shape evolution in neutron-rich osmium isotopes
Al-Dahan, N., Regan, P.H., Podolyák, Zs., Walker, P.M., Alkhomashi, N., Dracoulis, G.D., Farrelly, G.F., Benlliure, J., Pietri, S.B., Casten, R.F., Stevenson, P.D., Gelletly, W., Steer, S.J., Garnsworthy, A.B., Casarejos, E., Gerl, J., Wollersheim, H.J., Grebosz, J., Gorska, M., Kojouharov, I., Schaffner, H., Algora, A., Benzoni, G., Blazhev, A., Boutachkov, P., Bruce, A.M., Cullen, I.J., Denis Bacelar, A.M., Deo, A.Y., Estevez, M.E., Fujita, Y., Hoischen, R., Kumar, R., Lalkovski, S., Liu, Z., Mason, P.J., Mihai, C., Molina, F., Mücher, D., Rubio, B., Tamii, A., Tashenov, S., Valiente-Dobón, J.J. and Woods, P.J. (2012) Multiple β− decaying states in 194Re: shape evolution in neutron-rich osmium isotopes Physical Review C, 85 (3). ISSN 1089-490X
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Official URL: http://prc.aps.org/abstract/PRC/v85/i3/e034301
β decays from heavy, neutron-rich nuclei with A∼190 have been investigated following their production via the relativistic projectile fragmentation of an E/A=1 GeV 208Pb primary beam on a ∼2.5 g/cm2 9Be target. The reaction products were separated and identified using the GSI FRagment Separator (FRS) and stopped in the RISING active stopper. γ decays were observed and correlated with these secondary ions on an event-by-event basis such that γ-ray transitions following from both internal (isomeric) and β decays were recorded. A number of discrete, β-delayed γ-ray transitions associated with β decays from 194Re to excited states in 194Os have been observed, including previously reported decays from the yrast Iπ=(6+) state. Three previously unreported γ-ray transitions with energies 194, 349, and 554 keV are also identified; these transitions are associated with decays from higher spin states in 194Os. The results of these investigations are compared with theoretical predictions from Nilsson multi-quasiparticle (MQP) calculations. Based on lifetime measurements and the observed feeding pattern to states in 194Os, it is concluded that there are three β−-decaying states in 194Re.
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