0 citations0 references

αdecay studies of very neutron-deficient francium and radium isotopes

Physical Review C2005Vol. 71(2)

Citations Over TimeTop 10% of 2005 papers

J. Uusitalo, M. Leino, T. Enqvist, K. Eskola, T. Grahn, P. T. Greenlees, Peter G. Jones, R. Julin, S. Juutinen, A. Keenan, H. Kettunen, H. Koivisto, P. Kuusiniemi, A.-P. Leppänen, P. Nieminen, J. Pakarinen, P. Rahkila, C. Scholey

Abstract

Very neutron-deficient francium and radium isotopes have been produced in fusion evaporation reactions using $^{63}\mathrm{Cu}$ and $^{65}\mathrm{Cu}$ ions on $^{141}\mathrm{Pr}$ targets and $^{36}\mathrm{Ar}$ ions on $^{170}\mathrm{Yb}$ targets. The gas-filled recoil separator RITU was employed to collect the fusion products and to separate them from the scattered beam. The activities were implanted into a position-sensitive silicon detector after passing through a gas-counter system. The isotopes were identified using spatial and time correlations between the implants and decays. Two new \ensuremath{\alpha} decaying radium isotopes, $^{201}\mathrm{Ra}$ and $^{202}\mathrm{Ra}$, were identified. The \ensuremath{\alpha} decay energy and half-life of $^{203}\mathrm{Ra}$ were measured with improved precision. The \ensuremath{\alpha} decay properties measured for the francium isotopes $^{201}\mathrm{Fr},^{202}\mathrm{Fr},^{203}\mathrm{Fr}$, and $^{204}\mathrm{Fr}$ were confirmed, in many cases with improved precision. For the first time, a $(\ensuremath{\pi}{s}_{1/2}^{\ensuremath{-}1})1/{2}^{+}$ proton intruder state was identified in francium isotopes, namely in $^{201}\mathrm{Fr}$ and tentatively in $^{203}\mathrm{Fr}$. The measured decay properties for the neutron-deficient odd-mass Fr isotopes suggest an onset of substantial deformation at $N=112$.

Citations Over TimeTop 10% of 2005 papers

Abstract

Related Papers