Lifetime measurements and magnetic rotation in ${}^{107}$Ag

Lifetime measurements and magnetic rotation in $^{107}$ Ag

S. H. Yao, H. L. Ma, L. H. Zhu, X. G. Wu, C. Y. He, Y. Zheng, B. Zhang, G. S. Li, C. B. Li, S. P. Hu, X. P. Cao, B. B. Yu, C. Xu, and Y. Y. Cheng

Phys. Rev. C 89, 014327 – Published 29 January 2014

Abstract

The excited states in $^{107}$ Ag were populated through the heavy-ion fusion evaporation reaction $^{100}$ Mo ( $^{11}$ B, 4 $n$ ) $^{107}$ Ag at a beam energy of 46 MeV. Lifetimes of high-spin states in $^{107}$ Ag have been measured through the Doppler shift attenuation method. The deduced $B (M 1)$ values, gradually decreasing with increasing spin, clearly demonstrate that both the yrast positive-parity band and the yrast negative-parity band in $^{107}$ Ag are magnetic rotation bands. Furthermore, experimental deduced $B (M 1)$ values for the yrast positive-parity band are compared with the predictions of the particle rotor model. The approximate agreement between theoretical calculations and experimental results further confirms the mechanism of magnetic rotation for the yrast positive-parity band. In addition, a systematic investigation shows the evolution of the magnetic rotation mechanism in the $A \approx 110$ mass region.

Received 29 September 2013
Revised 2 January 2014

DOI:https://doi.org/10.1103/PhysRevC.89.014327

Authors & Affiliations

S. H. Yao¹, H. L. Ma¹, L. H. Zhu^2,*, X. G. Wu^1,†, C. Y. He¹, Y. Zheng¹, B. Zhang^1,3, G. S. Li¹, C. B. Li^1,4, S. P. Hu^1,3, X. P. Cao^1,5, B. B. Yu¹, C. Xu⁶, and Y. Y. Cheng⁶

¹China Institute of Atomic Energy, Beijing 102413, China
²School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191, China
³College of Physics and Technology, Shenzhen University, Shenzhen 518060, China
⁴College of Physics, Jilin University, Changchun 130012, China
⁵Department of Physics, Northeast Normal University, Changchun 130024, China
⁶School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China

^*Corresponding author: zhulh@buaa.edu.cn
^†Corresponding author: wxg@ciae.ac.cn

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Vol. 89, Iss. 1 — January 2014

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Physical Review C

covering nuclear physics