Fine structure in the $\mth{\alpha}$-decay of radium isotopes with mass numbers 209–212

F.P. Heßberger; S. Hofmann; D. Ackermann

doi:doi:10.1140/epja/i2002-10111-0

EPJ

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A 16, 365-370 (2003)
DOI: 10.1140/epja/i2002-10111-0

Fine structure in the $\mth{\alpha}$ -decay of radium isotopes with mass numbers 209-212

F.P. Heßberger¹, S. Hofmann¹ and D. Ackermann^{1, 2}

¹ Gesellschaft für Schwerionenforschung mbH, D-64220 Darmstadt, Germany
² Institut für Physik, Johannes Gutenberg - Universität Mainz, D-55099 Mainz, Germany

f.p.hessberger@gsi.de

(Received: 19 August 2002 / Revised version: 21 October 2002 / Published online: 18 February 2003)

Abstract
Radium isotopes with mass numbers from 209 to 212 have been produced by heavy-ion fusion reactions $\chem{^{204}Pb}$ ( $\chem{^{12}C}$ , xn) $\chem{^{216\mbox{-}{\it x}}Ra}$ . Radioactive decay properties were investigated by means of $\alpha$ - and $\alpha$ - $\gamma$ -spectroscopy after in-flight separation of the evaporation residues from the projectile beam by the velocity filter SHIP and implantation into a 16-strip position-sensitive Si detector. For the even-even nuclei ^210,212Ra we identified $\alpha$ transitions into the first-excited 2 ⁺-state of the daughter nuclei ^206,208Rn. Weak $\alpha$ transitions into excited levels of the odd- A daughter nuclei ^205,207Rn were also observed.