September 2014

Physical Review Letters 113, 032501 (2014)
DOI: 10.1103/PhysRevLett.113.032501

Multiple chiral doublet bands of identical configuration in 103Rh


I. Kuti, Q. B. Chen, J. Timár, D. Sohler, S. Q. Zhang, Z. H. Zhang, P. W. Zhao, J. Meng, K. Starosta, T. Koike, E. S. Paul, D. B. Fossan, C. Vaman, I. Y. Lee and A. O. Macchiavelli


Rotational doublet-band structures have been observed in several regions of the nuclear chart, mostly in the A≈100 and A≈130 region. Many experimental and theoretical studies were published providing several different scenarios for the nature of these band structures. The most feasible one is a novel form of spontaneous symmetry breaking: the chiral rotation of triaxial nuclei. In special circumstances, referred to as chiral geometry, in the intrinsic frame of the rotating triaxial nucleus the total angular momentum vector lies outside the three principal planes. Thus, its components along the principal axes can be oriented in left- and right-handed ways. In the laboratory frame the chiral symmetry is restored, which manifests itself as a pair of Δl = 1 nearly degenerate bands with the same parity.

Theoretical calculations predicted the possibility of having multiple pairs of chiral doublet bands in a single nucleus. The first experimental evidence for the predicted multiple chirality has already been reported in 133Ce, and also possibly in 107Ag. For a further confirmation of this theoretical assumption, we were searching for new chiral doublet bands besides the already published one in 103Rh.

In our study, medium- and high-spin states of 103Rh 103Rh were populated using the 96Zr(11B,4n) reaction. . The emitted γ-rays were detected by the Gammasphere spectrometer. The data analysis was carried out using the RADWARE software package. A more complete level scheme of 103Rh was constructed using the observed coincidence relations and relative intensities of the gamma transitions and based on the formerly reported states. As a result of our study, three sets of chiral doublet band structures have been identified. The observed doublet bands have been compared with results of calculations involving adiabatic and configuration-fixed constrained CDFT, TAC-CDFT, and quantum particle rotor model. The results reproduced the data rather well; according to these, two of the observed doublets belong to an identical configuration of π(1g9/2)-1 Ä ν(1h11/2)2(1g7/2)-1.

In contrast with the multiple chiral doublets predicted and experimentally reported in 133Ce, the observed multiple chirality in the negative-parity bands of 103Rh is built from the first and second doublets of the same configuration. This observation provides the first experimental evidence for a new type of multiple chiral doublets, and shows that the chiral geometry in nuclei can be robust against the increase of the intrinsic excitation energy.



Earlier:


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