Bonn 2010 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 42: Struktur und Dynamik von Kernen VII

HK 42.7: Vortrag

Donnerstag, 18. März 2010, 15:30–15:45, HG II

Investigation of chiral bands in ¹⁰⁶Ag — Evgenia Lieder^1,2, •Rainer Lieder¹, Rob Bark¹, Elena Lawrie¹, Kobus Lawrie¹, Sifiso Ntshangase¹, Simon Mullins¹, Paul Papka¹, Ntombi Kheswa¹, Jie Meng^3,4, 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 [1]. 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 h_11/2⊗π g_9/2⁻¹ 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.

[1] P. Joshi et al., Phys. Rev. Lett. 98, 102501 (2007)