https://inspirehep.net/files/636fff47d802e95437a2188711c559d8

Evidence for pseudospin-chiral quartet bands in the presence of octupole correlations

The nuclear Chirality-Parity (ChP) violation, a simultaneous breaking of chiral and reflection symmetries in the intrinsic frame, is investigated with a reflection-asymmetric triaxial particle rotor model. A new symmetry for an ideal ChP violation system is found and the corresponding selection rules of the electromagnetic transitions are derived. The fingerprints for the ChP violation including the nearly degenerate quartet bands and the selection rules of the electromagnetic transitions are provided. These fingerprints are examined for ChP quartet bands by taking a two-j shell h 11 / 2 and d 5 / 2 with typical energy spacing for A = 130 nuclei.

Selection rules of electromagnetic transitions for chirality-parity violation in atomic nuclei

Two new excited bands built on the πh11/2 configuration have been identified in Nd135 in addition to the known πh11/2 band. The energy spectra of the excited bands and the available electromagnetic transition probabilities are in good agreement with theoretical results obtained using quasiparticle-plus-triaxial-rotor model calculations. The properties of the bands identify them as tilted precession bands instead of wobbling bands. Our results give a new insight into the interpretation of the low-lying bands in odd-A mass nuclei, and can stimulate future studies to address the nuclear triaxiality.

/pdf/tilted-precession-bands-in-nd-135-geycz06h60.pdf

Tilted precession bands in Nd 135

The nuclear Chirality-Parity (ChP) violation, a simultaneous breaking of chiral and reflection symmetries in the intrinsic frame, is investigated with a reflection-asymmetric triaxial particle rotor model A new symmetry for an ideal ChP violation system is found and the corresponding selection rules of the electromagnetic transitions are derived The fingerprints for the ChP violation including the nearly degenerate quartet bands and the selection rules of the electromagnetic transitions are provided These fingerprints are examined for ChP quartet bands by taking a two-$j$ shell $h_{11/2}$ and $d_{5/2}$ with typical energy spacing for $A=$ 130 nuclei

Two new bands have been identified in 
$$^{137}$$

Nd from a high-statistics JUROGAM II gamma-ray spectroscopy experiment. Constrained density functional theory and particle rotor model calculations are used to assign configurations and investigate the band properties, which are well described and understood. It is demonstrated that these two new bands can be interpreted as chiral partners of previously known three-quasiparticle positive- and negative-parity bands. The newly observed chiral doublet bands in 
$$^{137}$$

Nd represent an important support to the existence of multiple chiral bands in nuclei. The present results constitute the missing stone in the series of Nd nuclei showing multiple chiral bands, which becomes the most extended sequence of odd–even and even-even nuclei presenting multiple chiral bands in the Segre chart.

/pdf/multiple-chiral-bands-in-137-nd-3bk6svp6jk.pdf

Multiple chiral bands in 137 Nd

One new pair of positive-parity chiral doublet bands have been identified in the odd-A nucleus Nd-135 which together with the previously reported negative-parity chiral doublet bands constitute a t ...

/pdf/chirality-of-nd-135-reexamined-evidence-for-multiple-chiral-1m2n61ijw5.pdf

Haipeng Liu

Papers

Chirality of Nd-135 reexamined : Evidence for multiple chiral doublet bands