Received 22 December 2010DOI:https://doi.org/10.1103/PhysRevC.83.019902© 2011 American Physical Society

The high-spin level structure of {sup 188}Au has been investigated via the {sup 173}Yb({sup 19}F,4n{gamma}) reaction at beam energies of 86 and 90 MeV. The previously reported level scheme has been modified and extended significantly. A new I{sup {pi}}=20{sup +} state associated with {pi}h{sub 11/2}{sup -1} x {nu}i{sub 13/2}{sup -2}h{sub 9/2}{sup -1} configuration and two new rotational bands, one of which is built on the {pi}h{sub 9/2} x {nu}i{sub 13/2} configuration, have been identified. The prolate-to-oblate shape transition through triaxial shape has been proposed to occur around {sup 188}Au for the {pi}h{sub 9/2} x {nu}i{sub 13/2} bands in odd-odd Au isotopes. Evidence for {pi}h{sub 11/2}{sup -1} x {nu}i{sub 13/2}{sup -1} structure of nonaxial shape with {gamma}\u003c-70 deg. has been obtained by comparison with total Routhian surface and cranked-shell-model calculations.

The high-spin level structure of Au-188 has been investigated via the Yb-173(F-19,4n gamma) reaction at beam energies of 86 and 90 MeV. The previously reported level scheme has been modified and extended significantly. A new I-pi = 20(+) state associated with pi h(11/2)(-1) circle times nu i(13/2)(-2)h(9/2)(-1) configuration and two new rotational bands, one of which is built on the pi h(9/2) circle times nu i(13/2) configuration, have been identified. The prolate-to-oblate shape transition through triaxial shape has been proposed to occur around Au-188 for the pi h(9/2) circle times nu i(13/2) bands in odd-odd Au isotopes. Evidence for pi h(11/2)(-1) circle times nu i(13/2)(-1) structure of nonaxial shape with gamma < -70 degrees has been obtained by comparison with total Routhian surface and cranked-shell-model calculations.

High-spin states in Sc-43 have been investigated by using the in-beam gamma-ray technique with the Al-27(F-19,p2n) reaction at 50 MeV. The J(pi)=(17/2(-)) level at 4382 keV, the J(pi)=(17/2(-),21/2(-)) level at 4633 keV, and some higher-lying levels were newly identified above the J(pi)=19/2(-) high-spin isomer, while the quasirotational structure built on the J(pi)=3/2(+) state has been extended up to the terminating J(pi)=(27/2(+)) state. The energy levels of the observed positive-parity quasirotational band were consistent with the prediction of the shell-model calculation in {0d(3/2),0f(7/2), 1p(3/2)} model space, while the J(pi)=(17/2(-),21/2(-)) level at 4633 keV could not be reproduced by the calculation in {0f1p} model space.