Enhancement of electron–ion recombination rates at low energy range in the heavy ion storage ring CSRm<xref rid="cpb_29_3_033401fn1" ref-type="fn">*</xref><fn id="cpb_29_3_033401fn1"><label>*</label><p>Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300) and the National Natural Science Foundation of China (Grant Nos. U1932207, 11904371, and U1732133).</p></fn>

Enhancement of electron–ion recombination rates at low energy range in the heavy ion storage ring CSRm**

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0402300) and the National Natural Science Foundation of China (Grant Nos. U1932207, 11904371, and U1732133).

Khan Nadir^{1, 2}, Huang Zhong-Kui¹, Wen Wei-Qiang^{1, 2, †}, Wang Shu-Xing³, Wang Han-Bing¹, Ma Wan-Lu³, Zhu Xiao-Long^{1, 2}, Zhao Dong-Mei¹, Mao Li-Jun^{1, 2}, Li Jie¹, Ma Xiao-Ming¹, Tang Mei-Tang¹, Yin Da-Yu¹, Yang Wei-Qing¹, Yang Jian-Cheng^{1, 2}, Yuan You-Jin^{1, 2}, Zhu Lin-Fan³, Ma Xin-Wen^{1, 2, ‡}

(a) The dependence of the RR rate coefficient enhancement Δα of bare-ions on charge state of ions. The violet empty triangles represents experimental data of the CRYRING^[8,9] and the blue color empty square is the TSR data.^[5] The error bars represent the contribution from the uncertainty of the excess rate, in this plot 20% uncertainty has been assumed for all the data. The solid line is the q^2.8 scaling for the bare ions. (b) The dependence of the RR rate coefficient enhancement Δα of non-bare ions on the charge state q of the ions. The empty green circles represent experimental RR rate enhancement data of the CSRm for non-bare ions. The 30% experimental uncertainty has been taken and the solid red line is the q^3.0 scaling.