Shape effects in $h_{\frac{11}{2}}$ and $g_{\frac{7}{2}}$ bands in ${}^{159}{Tm}$

The

\frac{7}{2} [523]

and

\frac{7}{2} [404]

bands are observed in

{}^{159}{Tm}

I = \frac{61}{2}

and

\frac{43}{2}

, respectively, well beyond the

i_{\frac{13}{2}}

neutron backbend. Before the backbend, the

\frac{7}{2} [523]

band exhibits large signature splitting, the

\frac{7}{2} [404]

none, which is interpreted as resulting from the very different driving influences of the

K = \frac{7}{2}

h_{\frac{11}{2}}

, and

g_{\frac{7}{2}}

orbits, respectively, on the core triaxiality. The

i_{\frac{13}{2}}

neutron alignment changes the signaure splitting in each band as a result of its dominant driving force to positive values of

γ

. Measured

\frac{B (M 1; I \to I - 1)}{B (E 2; I \to I - 2)}

values increase dramatically after the backbend, and this is explained in terms of calculated increases in the

M 1

transition rates and decreases in the

E 2

rates.

This publication has 12 references indexed in Scilit:

Shape effects inh112andg72bands inTm159