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Candidate magnetic rotational band in \(^{109}\hbox {Ag}\)

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Abstract

Excited states of \(^{109}\hbox {Ag}\) have been investigated by in-beam \(\gamma \)-ray spectroscopic techniques using the \(^{110}\hbox {Pd}\)(\(^{7}\hbox {Li}\), \(\alpha 4\hbox {n}\))\(^{109}\hbox {Ag}\) reaction at a beam energy of 46 MeV. The level scheme of \(^{109}\hbox {Ag}\) is significantly extended with the addition of more than 20 new \(\gamma \) transitions. For the positive-parity yrast band, it is extended to \(41/2^{+}\) state and \(2\hbar \) higher than the earlier work. A negative-parity band decaying to the yrast band by eleven new linking transitions is identified, and several E2 crossover transitions of this band are observed, thereby confirming the spin-parity assignment and the ordering of dipole transitions above the \(I^{\pi } = 17/2^{-}\) level. Experimental total angular momenta, kinematical and dynamical moments of inertia, and B(M1)/B(E2) ratio for the negative-parity band are compared with the predictions of self-consistent titled axis cranking relativistic mean-field model. Based on the theoretical description and the observed characteristics, the negative-parity dipole band is suggested as a magnetic rotational band arising from shears mechanism.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: In fact, all the relevant information on the level scheme has been provided already in Fig. 1 and Table 1. If you refer to the raw data from the experiment, they can be made available upon request.]

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Acknowledgements

This work is supported by the National Natural Science Foundation of China under Grant Nos. 11775098, 11475072, 11675063, U1867210, 11405072, 11205069 and 11075064, Jilin Scientific and Technological Development Program Nos. 20190201137JC and 20180520195JH, the 13th Five-Year Plan of Scientific Research of Jilin Province No. JJKH20180117KJ, China Postdoctoral Science Foundation Nos. 2015M571354 and 2013M541285, the National Basic Research Programme of China under Grant Nos. 2007CB815005, and the Specialized Research Fund for the Doctoral Programme of Higher Education of China under Grant No. 20050183008.

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Authors and Affiliations

  1. College of Physics, Jilin University, Changchun, 130012, China

    K. Y. Ma, J. B. Lu, J. Li, Y. J. Ma, D. Yang, W. J. Sun, Q. Y. Yang, X. Guan, J. Q. Wang, H. N. Pan, H. Wang & T. F. Cui

  2. College of Electronic Science and Engineering, Jilin University, Changchun, 130012, China

    K. Y. Ma & D. M. Zhang

  3. School of Physics and Nuclear Energy Engineering, Beihang University, Beijing, 100191, China

    L. H. Zhu

  4. China Institute of Atomic Energy, Beijing, 102413, China

    X. G. Wu, Y. Zheng & C. B. Li

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  1. K. Y. Ma
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Communicated by Wolfram Korten

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Ma, K.Y., Lu, J.B., Li, J. et al. Candidate magnetic rotational band in \(^{109}\hbox {Ag}\). Eur. Phys. J. A 56, 209 (2020). https://doi.org/10.1140/epja/s10050-020-00213-w

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