)  use
the reduced matrix elements <!-- MATH
 $\langle I ' || Ek || I \rangle$
 -->
<SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img110.svg"
 ALT="$\langle I ' \vert\vert Ek \vert\vert I \rangle$"></SPAN> given by the
definitions of Alder &amp; Winther (not by those of Brink &amp; Satchler),
by assuming a rotational model where <SPAN CLASS="MATH"><IMG
 STYLE=""
 SRC="img111.svg"
 ALT="$K$"></SPAN> is a good quantum number:
 <BR>
<DIV CLASS="displaymath">

<!-- MATH
 \begin{eqnarray}
Mn(Ek) = \langle I ' || Ek ||