Bonn 2010 – wissenschaftliches Programm
HK 42.7: Vortrag
Donnerstag, 18. März 2010, 15:30–15:45, HG II
Investigation of chiral bands in 106Ag — Evgenia Lieder1,2, •Rainer Lieder1, Rob Bark1, Elena Lawrie1, Kobus Lawrie1, Sifiso Ntshangase1, Simon Mullins1, Paul Papka1, Ntombi Kheswa1, Jie Meng3,4, Bin Qi5, Shuangquan Zhang3, and Zhipan Li3 — 1iThemba LABS, Somerset West, South Africa — 2FhG, INT, Euskirchen, Germany — 3PhS, PKU, Beijing, China — 4PhS, BUAA, Beijing, China — 5SDU, Weihai, China
Dipole bands in 106Ag have been studied with the γ-detector array AFRODITE at iThemba LABS, South Africa. A 96Zr(14Nd,4n)106Ag reaction at a beam energy of 71 MeV has been used. The three previously known negative-parity bands in 106Ag have been extended. Bands 1 and 2 were proposed to be chiral partner bands . However, in view of the present results, bands 2 and 3 seem to be better candidates for chiral partner bands since their staggering parameters, B(M1)/B(E2) ratios, kinematic moments of inertia and quasiparticle alignments agree much better than those of bands 1 and 2. Triaxial relativistic mean field (RMF) and particle-rotor model (PRM) calculations support this interpretation. In the potential energy surface of 106Ag, obtained in RMF calculations, two minima have been found in the β2−γ plane. Based on PRM calculations using the deformation parameters of the two minima and a ν h11/2⊗π g9/2−1 particle-hole configuration, bands 2 and 3 may represent partners with chiral vibration at γ ≈ 12∘. Band 1, located in the other minimum, may be a magnetic dipole band or the partner of a second pair of chiral bands.
 P. Joshi et al., Phys. Rev. Lett. 98, 102501 (2007)