Three sets of chiral doublet band structures have been identified in the $^{103}\mathrm{Rh}$ nucleus. The properties of the observed chiral doublet bands are in good agreement with theoretical results obtained using constrained covariant density functional theory and particle rotor model calculations. Two of them belong to an identical configuration and provide the first experimental evidence for a novel type of multiple chiral doublets, where an ``excited'' chiral doublet of a configuration is seen together with the ``yrast'' one. This observation shows that the chiral geometry in nuclei can be robust against the increase of the intrinsic excitation energy.

/pdf/multiple-chiral-doublet-bands-of-identical-configuration-in-4yk97wqn0f.pdf

Multiple chiral doublet bands of identical configuration in Rh 103

Multi-quasiparticle γ-band structure in neutron-deficient Ce and Nd isotopes

High spin structure of 136Ce

The backbending phenomena observed in Ce isotopes, $^{132,134,136}\mathrm{Ce}$ are investigated in terms of a pair-truncated shell model, a fully microscopic theory that conserves the nucleon number and the total spin. The model reproduces the backbending phenomena quite well, where the experimental bending point of $^{132}\mathrm{Ce}$ is spin 12 and those of $^{134}\mathrm{Ce}$ and $^{136}\mathrm{Ce}$ are spin 10. In addition to high spin states, the theory provides a successful description of energy levels for low-lying collective states as well as those electromagnetic properties, such as $B(E2)$ branching ratios and $g$ factors.

https://sucra.repo.nii.ac.jp/?action=repository_action_common_download&item_id=12494&item_no=1&attribute_id=24&file_no=1

Backbending phenomena in Ce-132,Ce-134,Ce-136 with a pair-truncated shell model

Antimagnetic rotation and sudden change of electric quadrupole transition strength in 143Eu

High spin states of $^{134}\mathrm{Ce}$ have been studied using an array of 8 Compton suppressed clover detectors and a multiplicity filter consisting of $14\phantom{\rule{0.3em}{0ex}}\text{NaI}(\mathrm{T}1)$ detectors. Two new $\ensuremath{\Delta}I=1$ bands $B4$ and $B5$ with strong intraband magnetic dipole transitions have been established. The crossover $E2$ transitions have been observed in the $B4$ band and lifetimes of levels, both in $B4$ and $B5$ bands, have been measured using the Doppler shift attenuation method. The measured $B(M1)$ values are large for the $B4$ band, yet the measured $B(M1)∕B(E2)$ ratios are nearly constant with increasing frequency and do not support the magnetic rotation character. The $B4$ band also exhibits a small gain in alignment at a higher frequency suggesting an upbending and a band crossing. These features are sought to be explained in terms of two closely lying configurations $A:\ensuremath{\pi}{({g}_{7∕2})}^{2}\ensuremath{\bigotimes}\ensuremath{\nu}({h}_{11∕2}{d}_{3∕2})$ and $B:\ensuremath{\pi}{({h}_{11∕2})}^{2}\ensuremath{\bigotimes}\ensuremath{\nu}({h}_{11∕2}{d}_{3∕2})$, which have a small and a moderate deformation, respectively. The tilted axis cranking (TAC) calculations suggest that configuration $B$ crosses the configuration $A$ with a small alignment gain and mixing between the two may explain the observed features. The measured $B(M1)$ values deduced from the lifetimes for the $B5$ band show a decrease with increasing spin which is a characteristic feature of magnetic rotation bands. The results of the TAC calculations explain the $B5$ band very well by using the four-quasiparticle configuration $\ensuremath{\pi}({g}_{7∕2}{h}_{11∕2})\ensuremath{\bigotimes}\ensuremath{\nu}({h}_{11∕2}^{\ensuremath{-}2})$ and establish it as a magnetic rotational band.

Magnetic rotation and shape mixing in Ce 134

Shape transition and tilted axis rotation in 136 Ce

Heavy-ion fusion reactions $^{122}\mathrm{Sn}$($^{14,15}\mathrm{N}$, $\mathit{xn}$)$^{132}\mathrm{La}$ have been utilized for the lifetime measurements using the recoil distance method. The lifetimes of seven low-lying excited states were obtained. In addition, the lifetimes of two states belonging to a band, which was identified as a decoupled band, were obtained. The decoupling behavior in $^{132}\mathrm{La}$ has been theoretically investigated using the particle-rotor model in the model space of $\ensuremath{\pi}{h}_{11/2}$ and ($\ensuremath{\nu}{s}_{1/2},$ $\ensuremath{\nu}{d}_{3/2}$). The pseudospin coupling model was also utilized to understand the decoupling behavior in terms of the valence-particle configuration $\ensuremath{\pi}{h}_{11/2}({\ensuremath{\Omega}}_{\ensuremath{\pi}}=\frac{1}{2})\ensuremath{\bigotimes}\ensuremath{\nu}[\mathrm{411\ifmmode \tilde{}\else \~{}\fi{}}]({\ensuremath{\Omega}}_{\ensuremath{\nu}}=\frac{1}{2},\frac{3}{2})$, and a reasonable agreement with the experiment was obtained.

Decoupling behavior in {sup 132}La

The characteristics of a Compton-suppressed, two-fold segmented, Clover detector have been studied in singles and add-back modes for using it in the study of heavy-ion fusion–evaporation reactions. The measurements have been performed with standard sources of 152 Eu , 60 Co and in-beam γ -rays from the fusion–evaporation reaction 28 Si on 27 Al at E lab =100 MeV . Reduction in γ -ray Doppler broadenings due to the two-fold segmentation is demonstrated through in-beam data.

Characteristics of a two-fold segmented Clover detector

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