2020 Impact factor 3.043
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. Ackermann1, 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.

PACS
23.60.+e - Alpha decay.
27.90.+b - $A \geq 220$ .

© Società Italiana di Fisica, Springer-Verlag 2003