Speaker
Description
Chiral rotation has been found in many triaxial nuclei in the $A\sim$ 80, 100, 130, and 190 mass regions [1]. In the $A\sim$ 100 mass region rotational bands in the $^{104}$Rh nucleus have been studied, using the $^{96}$Zr($^{11}$B,3n) fusion-evaporation reaction at a beam energy of 40~MeV with the Gammasphere spectrometer.
Earlier two negative-parity chiral doublets [2,3] were identified from this experiment, establishing multiple chirality for the first time in an odd-odd nucleus in the $A\sim100$ region.
In the present more extensive analysis of the same data set, several additional positive-parity bands have been discovered, including two new chiral doublets [4]. The high-j part of one of these structures corresponds to a 1-particle-2-hole type configuration, which is very rare among the observed chiral doublets.
The newly discovered positive-parity rotational bands and chiral doublets will be presented.
References
[1] B. W. Xiong, Y. Y. Wang, Atomic Data and Nuclear Data Tables 125 (2019) 193.
[2] C. Vaman \textit{et al.}, Phys. Rev. Lett. \textbf{92} (2004) 032501.
[3] A. Krakó \textit{et al.}, Phys. Lett. B 855, 138850 (2024)
[4] A. Krakó \textit{et al.}, submitted to Phys. Rev.