Detailed experimental data, extracted from original publications, for 248 magnetic rotational (MR or Shears) structures spread over 123 nuclides are presented in this paper, with brief commentary about each band structure.
Abstract Magnetic-Rotational Structures
This is the second edition of our earlier publication in 2000 [1], and an unpublished update of 2006 [2]. A majority of these nuclei are located at or near semi-magic nucleon numbers, mostly for protons. For example, as many as 88 bands are currently known for the nuclides in the Pb (Z=82) region. It is interesting that the proton magic numbers appear to play a major role in this phenomenon. A brief discussion of the salient features of the MR bands and their theoretical interpretation has been presented in the present review. The table contains gamma-ray energies, associated level energies with spins and parities, level lifetimes, B(M1), B(E2), and B(M1)/B(E2) ratios, the latter four when available, and probable configurations.
We find that many bands claimed in the literature as MR bands still have tentative assignments, as level lifetimes for many bands, which provide critical criteria for identification of such structures, are lacking. Additionally, theoretical calculations for many of these bands are also missing in literature. While this review is mainly based on original research articles, nuclear structure databases ENSDF[3], XUNDL[4], and NSR[5] available on the this https URL webpage have been consulted for completeness. The literature cut-off date is February 28, 2023.
Author:
Sushil Kumar, Sukhjeet Singh, Balraj Singh, Amita, Ashok Kumar Jain
Source credit:
arXiv:2303.00499v1 [nucl-th]
https://doi.org/10.48550/arXiv.2303.00499