DOI: 10.1140/epja/i2002-10111-0
Fine structure in the
-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
(
,
xn)
. Radioactive decay properties
were investigated by means of
-
and
-
-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
transitions into the first-excited 2
+-state
of the daughter nuclei
206,208Rn.
Weak
transitions into excited levels of the odd-
A
daughter nuclei
205,207Rn were also observed.
23.60.+e - Alpha decay.
27.90.+b -

© Società Italiana di Fisica, Springer-Verlag 2003