Description of chiral doublets inA∼130nuclei and the possible chiral doublets inA∼100nuclei

Abstract

The chiral doublets for nuclei in A ∼ 100 and A ∼ 130 regions have been studied with the particle-rotor model. The experimental spectra of chiral partners bands for four N = 75 isotones in A ∼ 130 region have been well reproduced by the calculation with the configuration πh 11/2 ⊗νh −1 11/2 . The possible chiral doublets in A ∼ 100 region have been predicted by the PRM model with the configuration πg 9/2 ⊗ νg −1 9/2 based on the analysis of the spectra, the ω-I relation, the B(M 1) and B(E2) transition probabilities, and the structure of the wave functions. The possible chiral doublets for nuclei with asymmetric particle and hole configuration are also discussed.

Lifetime measurements in mass regions A=100 and A=130 as a test for chirality in nuclear systems

“…Pairs of bands, presumably due to the breaking of the chiral symmetry in triaxial nuclei, have been found in the mass regions A∼130 [4][5][6][7][8][9], A∼105 [10][11][12][13][14][15] and A∼195 [16][17][18], and A∼80 [19]. There is also a significant interest from theoretical point of view to investigate the chiral phenomenon [2,[20][21][22][23][24]. However, only in few cases ( 126 Cs [25], 128 Cs [8] and 198 Tl [17]) the systematic properties [26] of the chiral bands, which originate from the underlying symmetry, were confirmed including the transition from chiral vibrations to static chirality in ( 135 Nd) [9].…”

Odd-odd nuclei as the core-particle-hole systems and chirality

“…Subsequently, various versions of the rotor-quasiparticle/ particle-hole model were applied to different nuclei, and the chirality phenomenon was investigated [8][9][10][11][12][13][14]. The rigidity and the maximal triaxiality (γ = 30…”

Chiral Bands for Quasi-Proton and Quasi-Neutron Coupling With a Triaxial Rotor

“…The advantage of the cranked mean field approach to describe nuclear rotation bands is that it can be easily extended to the multi-quasiparticle case. However, the usual cranking approach is a semiclassical model, where the total angular momentum is not a good quantum number, and the description of quantum tunneling of chiral partners is beyond the mean field approximation [28,29,30].…”

“…The model describes the system in the laboratory reference frame and yields directly the energy splitting and tunneling between doublet bands. Chirality for nuclei in A ∼ 100 and A ∼ 130 regions has been studied with the particle-rotor model for certain particle-hole configurations [30,31], or the core-quasiparticle/core-particle-hole coupling model [9,32] following the Kerman-Klein-Dönau-Frauendorf method [33]. Selection rules of electromagnetic transitions for chiral doublet bands have been proposed based on a simple particle-hole-triaxial rotor model [34].…”