Abstract
Isochronous mass spectrometry (IMS) of heavy-ion storage rings is a powerful tool for the mass measurements of short-lived nuclei. In IMS experiments, masses are determined through precision measurements of the revolution times of the ions stored in the ring. However, the revolution times cannot be resolved for particles with nearly the same mass-to-charge (m/q) ratios. To overcome this limitation and to extract the accurate revolution times for such pairs of ion species with very close m/q ratios, in our early work on particle identification, we analyzed the amplitudes of the timing signals from the detector based on the emission of secondary electrons. Here, the previous data analysis method is further improved by considering the signal amplitudes, detection efficiencies, and number of stored ions in the ring. A sensitive Z-dependent parameter is introduced in the data analysis, leading to a better resolution of \(^{34}\)Ar\(^{18+}\) and \(^{51}\)Co\(^{27+}\) with \(A/Z=17/9\). The mean revolution times of \(^{34}\)Ar\(^{18+}\) and \(^{51}\)Co\(^{27+}\) are deduced, although their time difference is merely 1.8 ps. The uncorrected, overlapped peak of these ions has a full width at half maximum of 7.7 ps. The mass excess of \(^{51}\)Co was determined to be \(-27{,}332(41)\) keV, which is in agreement with the previous value of \(-27{,}342(48)\) keV.
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M. Hausmann, F. Attallah, K. Beckert et al., First isochronous mass spectrometry at the experimental storage ring ESR. Nucl. Instrum. Methods Phys. Res. A 446, 569 (2000). https://doi.org/10.1016/S0168-9002(99)01192-4
M. Hausmann, J. Stadlmann, F. Attallah et al., Isochronous mass measurements of hot exotic nuclei. Hyperfine Interact. 132, 291–297 (2001). https://doi.org/10.1023/A:1011911720453
Yu.A. Litvinov, S. Bishop, K. Blaum et al., Nuclear physics experiments with ion storage rings. Nucl. Instrum. Methods Phys. Res. B 317, 603–616 (2013). https://doi.org/10.1016/j.nimb.2013.07.025
F. Bosch, Yu.A. Litvinov, Th. Stöhlker, Nuclear physics with unstable ions at storage rings. Prog. Part. Nucl. Phys. 73, 84–140 (2013). https://doi.org/10.1016/j.ppnp.2013.07.002
Y.H. Zhang, Yu.A. Litvinov, T. Uesaka et al., Storage ring mass spectrometry for nuclear structure and astrophysics research. Phys. Scr. 91, 073002 (2016). https://doi.org/10.1088/0031-8949/91/7/073002
M. Steck, Yu.A. Litvinov, Heavy-ion storage rings and their use in precision experiments with highly charged ions. Prog. Part. Nucl. Phys. 115, 103811 (2020). https://doi.org/10.1016/j.ppnp.2020.103811
B. Mei, H.S. Xu, Y.H. Zhang et al., Odd-even staggering in yields of neutron-deficient nuclei produced by projectile fragmentation. Phys. Rev. C 94, 044615 (2016). https://doi.org/10.1103/PhysRevC.94.044615
C.W. Ma, Y.D. Song, H.L. Wei, Binding energies of near proton-drip line Z = 22–28 isotopes determined from measured isotopic cross section distributions. Sci. China Phys. Mech. Astron. 62, 012013 (2019). https://doi.org/10.1007/s11433-018-9256-8
Y.D. Song, H.L. Wei, C.W. Ma, J.H. Chen, Improved FRACS parameterizations for cross sections of isotopes near the proton drip line in projectile fragmentation reactions. Nucl. Sci. Tech. 29, 96 (2018). https://doi.org/10.1007/s41365-018-0439-4
J. Trötscher, K. Balog, H. Eickhoff et al., Mass measurements of exotic nuclei at the ESR. Nucl. Instrum. Methods Phys. Res. B 70, 455–458 (1992). https://doi.org/10.1016/10.1016/0168-583X(92)95965-T
B. Mei, X.L. Tu, M. Wang et al., A high performance time-of-Flight detector applied to isochronous mass measurement at CSRe. Nucl. Instrum. Methods Phys. Res. A 624, 109 (2010). https://doi.org/10.1016/j.nima.2010.09.001
W. Zhang, X.L. Tu, M. Wang et al., Time-of-flight detectors with improved timing performance for isochronous mass measurements at the CSRe. Nucl. Instrum. Methods Phys. Res. A 756, 1 (2014). https://doi.org/10.1016/j.nima.2014.04.051
T. Yamaguchi for the Rare RI Ring Collaboration, Present status of Rare-RI Ring facility at RIBF. Phys. Scr. T166, 014039 (2015). https://doi.org/10.1088/0031-8949/2015/T166/014039
X.L. Tu, M. Wang, Yu.A. Litvinov et al., Precision isochronous mass measurements at the storage ring CSRe in Lanzhou. Nucl. Instrum. Methods Phys. Res. A 654, 213 (2011). https://doi.org/10.1016/j.nima.2011.07.018
Y.M. Xing, Y.H. Zhang, M. Wang et al., Particle identification and revolution time corrections for the isochronous mass spectrometry in storage rings. Nucl. Instrum. Methods Phys. Res. A 941, 162331 (2019). https://doi.org/10.1016/j.nima.2019.06.072
P.F. Liang, L.J. Sun, J. Lee et al., Simultaneous measurement of \(\beta\)-delayed proton and \(\gamma\) emission of \(^{26}\)P for the \(^{25}\)Al(\(p,\gamma\)), \(^{26}\)Si reaction rate. Phys. Rev. C 101, 024305 (2020). https://doi.org/10.1023/A:10119117204530
B.H. Sun, J.W. Zhao, X.H. Zhang et al., Towards the full realization of the RIBLL2 beam line at the HIRFL-CSR complex. Sci. Bull. 63, 78 (2018). https://doi.org/10.1016/j.scib.2017.12.005
Y. Yamaguchi, M. Wakasugi, T. Uesaka et al., Construction of rare-RI ring at RIKEN RI beam factory. Nucl. Instrum. Methods Phys. Res. 317, 629–635 (2013). https://doi.org/10.1016/j.nimb.2013.06.004
T. Yamaguchi, Y. Yamaguchi, A. Ozawa, The challenge of precision mass measurements of short-lived exotic nuclei: development of a new storage ring mass spectrometry. Int. J. Mass Spectr. 349–350, 240–246 (2013). https://doi.org/10.1016/j.ijms.2013.04.027
J.W. Xia, W.L. Zhan, B.W. Wei et al., The heavy ion cooler-storage-ring project (HIRFL-CSR) at Lanzhou. Nucl. Instrum. Methods Phys. Res. A 488, 11–25 (2002). https://doi.org/10.1016/S0168-9002(02)00475-8
B. Franzke, H. Geissel, G. Münzenberg, Mass and lifetime measurements of exotic nuclei in storage rings. Mass Spectr. Rev. 27, 428–469 (2008). https://doi.org/10.1023/A:10119117204535
C.Y. Fu, Y.H. Zhang, M. Wang et al., Mass measurements for the \(T_{z}=-2\)\(fp\)-shell nuclei \(^{40}\)Ti, \(^{44}\)Cr, \(^{46}\)Mn, \(^{48}\)Fe, \(^{50}\)Co, and \(^{52}\)Ni. Phys. Rev. C 102, 054311 (2020). https://doi.org/10.1023/A:10119117204536
X. Xu, M. Wang, K. Blaum et al., Masses of neutron-rich \(^{52\text{- }54}{{\rm Sc}} \text{ and } ^{54,56}{{\rm Ti}}\) nuclides: the \(N=32\) subshell closure in scandium. Phys. Rev. C 99, 064303 (2019). https://doi.org/10.1103/PhysRevC.99.064303
X. Xu, J.H. Liu, C.X. Yuan et al., Masses of ground and isomeric states of \(^{101}\)In and configuration-dependent shell evolution in odd-\(A\) indium isotopes. Phys. Rev. C 100, 051303(R) (2019). https://doi.org/10.1103/PhysRevC.100.051303
Y.H. Zhang, P. Zhang, X.H. Zhou et al., Isochronous mass measurements of \({T}_{z}={-}1 fp\)-shell nuclei from projectile fragmentation of \(^{58}\)Ni. Phys. Rev. C 98, 014319 (2018). https://doi.org/10.1103/PhysRevC.98.014319
C.Y. Fu, Y.H. Zhang, X.H. Zhou et al., Masses of the \({T}_{z}={-}3/2\) nuclei \(^{27}{{\rm P and }}^{29}\)S. Phys. Rev. C 98, 014315 (2018). https://doi.org/10.1103/PhysRevC.98.014315
M.Z. Sun, X.H. Zhou, M. Wang et al., Precision mass measurements of short-lived nuclides at HIRFL-CSR in Lanzhou. Front. Phys. 13(6), 132112 (2018). https://doi.org/10.1023/A:10119117204539
X. Xu, P. Zhang, P. Shuai et al., Identification of the lowest \(T=2\), \({J}^{{\pi }}={0}^{+}\) isobaric analog state in \(^{52}\) Co and its impact on the understanding of \({\beta }\)-decay properties of \(^{52}\)Ni. Phys. Rev. Lett. 117, 182503 (2016). https://doi.org/10.1103/PhysRevLett.117.182503
X. Xu, M. Wang, Y.H. Zhang et al., Direct mass measurements of neutron-rich \(^{86}\)Kr projectile fragments and the persistence of neutron magic number N=32 in Sc isotopes. Chin. Phys. C 39, 104001 (2015). https://doi.org/10.1016/j.ppnp.2013.07.0020
X. Tu, H. Xu, M. Wang et al., Direct mass measurements of short-lived A = 2Z-1 nuclides \(^{63}\)Ge, \(^{65}\)As, \(^{67}\)Se, and \(^{71}\)Kr and their impact on nucleosynthesis in the rp process. Phys. Rev. Lett. 106, 112501 (2011). https://doi.org/10.1103/PhysRevLett.106.112501
P. Zhang, X. Xu, P. Shuai et al., High-precision \(Q_{EC}\) values of superallowed 0\(^{+}\rightarrow\)0\(^{+}\)\(\beta\)-emitters \(^{46}\)Cr, \(^{50}\)Fe and \(^{54}\)Ni. Phys. Lett. B 767, 20–24 (2017). https://doi.org/10.1016/j.ppnp.2013.07.0022
Y. Xing, K. Li, Y.H. Zhang et al., Mass measurements of neutron-deficient Y, Zr, and Nb isotopes and their impact on rp and \(\nu\)p nucleosynthesis processes. Phys. Lett. B 781, 358–363 (2018). https://doi.org/10.1016/j.ppnp.2013.07.0023
P. Shuai, H.S. Xu, X.L. Tu et al., Charge and frequency resolved isochronous mass spectrometry and the mass of \(^{51}\)Co. Phys. Lett. B 735, 327 (2014). https://doi.org/10.1016/j.ppnp.2013.07.0024
Y.H. Zhang, H.S. Xu, Yu.A. Litvinov et al., Mass measurements of the neutron-deficient \(^{41}\)Ti, \(^{45}\)Cr, \(^{49}\)Fe, and \(^{53}\)Ni nuclides: First test of the isobaric multiplet mass equation in \(fp\)-shell nuclei. Phys. Rev. Lett. 109, 102501 (2012). https://doi.org/10.1016/j.ppnp.2013.07.0025
X.L. Yan, H.S. Xu, Yu.A. Litvinov et al., Mass measurement of \(^{45}\)Cr and its impact on the Ca-Sc cycle in X-ray bursts. Astrophys. J. Lett. 766, L8 (2013). https://doi.org/10.1016/j.ppnp.2013.07.0026
W. Zhang, X.L. Tu, M. Wang et al., A timing detector with pulsed high-voltage power supply for mass measurements at CSRe. Nucl. Instrum. Methods Phys. Res. A 755, 38 (2014). https://doi.org/10.1016/j.nima.2014.04.031
X. Xu, M. Wang, P. Shuai et al., A data analysis method for isochronous mass spectrometry using two time-of-flight detectors at CSRe. Chin. Phys. C 39, 106201 (2015). https://doi.org/10.1016/j.ppnp.2013.07.0028
Y.M. Xing, M. Wang, Y.H. Zhang et al., First isochronous mass measurements with two time-of-flight detectors at CSRe. Phys. Scr. T166, 014010 (2015). https://doi.org/10.1016/j.ppnp.2013.07.0029
P. Shuai, X. Xu, Y.H. Zhang et al., An improvement of isochronous mass spectrometry: velocity measurements using two time-of-flight detectors. Nucl. Instrum. Methods Phys. Res. B 376, 311–315 (2016). https://doi.org/10.1016/j.nimb.2016.02.006
X.L. Yan, R.J. Chen, M. Wang et al., Characterization of a double Time-Of-Flight detector system for accurate velocity measurement in a storage ring using laser beams. Nucl. Instrum. Methods Phys. Res. A 931, 52 (2019). https://doi.org/10.1016/j.nima.2019.03.058
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Xu Zhou, Meng Wang, Yu-Hu Zhang, Xin-Liang Yan and Peng Shuai. The first draft of the manuscript was written by Xu Zhou and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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This work was supported by the National Key R&D Program of China (Nos. 2016YFA0400504 and 2018YFA0404401), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB34000000), the National Natural Science Foundation of China (Nos. 11905261, 11805032, 11975280, and 11605248), the CAS “Light of West China” Program, the China Postdoctoral Science Foundation (No. 2019M660250), the FRIB-CSC Fellowship, China (No. 201704910964), the International Postdoctoral Exchange Fellowship Program 2017 by the Office of China Postdoctoral Council (No. 60 Document of OCPC, 2017), and the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme (No. 682841 “ASTRUm”).
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Zhou, X., Wang, M., Zhang, YH. et al. Charge resolution in the isochronous mass spectrometry and the mass of \(^{51}\)Co. NUCL SCI TECH 32, 37 (2021). https://doi.org/10.1007/s41365-021-00876-0
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DOI: https://doi.org/10.1007/s41365-021-00876-0