Experimental Investigation of the Transition Energy $\gamma_t$ in the Isochronous Mode of the HIRFL-CSRe
| Autor: | Ge, W. W., Yuan, Y. J., Yang, J. C., Chen, R. J., Yan, X. L., Du, H., Li, Z. S., Yang, J., Yin, D. Y., Mao, L. J., Li, X. N., Zheng, W. H., Shen, G. D., Wu, B., Ruan, S., Wang, G., Zhao, H., Wang, M., Sun, M. Z., Xing, Y. M., Zhang, P., Fu, C. Y., Shuai, P., Xu, X., Zhang, Y. H., Bao, T., Chen, X. C., Huang, W. J., Li, H. F., Liu, J. H., Litvinov, Yu. A., Litvinov, S., Zeng, Q., Zhou, X. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Nuclear Inst. and Methods in Physics Research, A (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1016/j.nima.2018.08.059 |
| Popis: | The Isochronous Mass Spectrometry (IMS) based on storage rings is a powerful technique for mass measurement of short-lived exotic nuclei. The transition energy $\gamma_t$ of the storage ring is a vital parameter of the IMS technique. It is difficult to measure the $\gamma_t$ and its relation to momentum spread or circulating length, especially to monitor the variation of $\gamma_t$ during experiments. An experimental investigation on the $\gamma_t$ has been performed for the IMS experiment at the Cooler Storage Ring of the Heavy Ion Research Facility in Lanzhou (HIRFL-CSRe). With the velocity measured by two time-of-flight (TOF) detectors, the $\gamma_t$ as a function of orbital length can be determined. The influences of higher order magnetic field components on the $\gamma_t$ function were inferred for isochronous correction. This paper introduces and investigates the influence of dipole magnetic fields, quadrupole magnetic fields and sextupole magnetic fields on the $\gamma_t$ function. With the quadrupole magnets and sextupole magnets corrections, a mass resolution of 171332 (FWHM) and $\sigma(T)/T=1.34\times10^{-6}$ were reached, which shall be compared with 31319 (FWHM) and $\sigma(T)/T=7.35\times10^{-6}$ obtained without correction. Comment: 10 figures,19 pages |
| Databáze: | arXiv |
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