Speaker
Mr
Thomas Behrens
(Physics Department E12, TU München)
Description
Recent studies on isotopes around the shell closure at N=82 have shown that despite
decreasing excitation energy $E(2^{+}_{1})$ the B(E2;$0^{+}_{1} \rightarrow
2^{+}_{1}$) = B(E2$\uparrow$) values for Te and Sn isotopes above N=82 are lower than
expected from a general systematics established as "Grodzins' rule". The aim of the
experiment IS411 is to measure
the B(E2$\uparrow$) values of neutron-rich even-even nuclei in the mass region of
$A\approx140$.
As a continuation of our experimental campaigns in 2004 and 2005, where the
$2^{+}_{1}\rightarrow0^{+}_{g.s.}$ gamma transitions following Coulomb excitation of
$^{122,124}$Cd and $^{138,140,142}$Xe beams have been measured with the gamma
detector array MINIBALL, in 2006 we measured the respective transitions in $^{144}$Xe
and $^{124,126}$Cd.
We show preliminary results on B(E2$\uparrow$) values of $^{144}$Xe and
$^{126}$Cd for the first time. Perspectives for future
experiments will be discussed.
This work was supported by BMBF 06MT238 and RII3-EURONS (506065).
Primary author
Mr
Thomas Behrens
(Physics Department E12, TU München)
