Cs

Click on a "Nuclear data" button to display properties of isotopes with a half-life exceeding 10 minutes (3 minutes for Fr).
Click on a "Hyperfine constant A" button to display the values of magnetic-dipole hyperfine constants A (in MHz) complied from published papers.
If the atom/ion has metastable states a "Metastable state properties" button will show with a list of metastable states. Click on the button to display the data for dominant electric quadrupole (E2) and magnetic dipole (M1) transitions, lifetimes, and quadrupole moments.
Click on a "Ref" button to display the sources of the data.
Click on the "Print" button to print the tables you see on the screen.

Isotope info	Mass number	Symbol	Half-life info	Natural abundance (%) info	Nuclear spin	Rms radii (fm) info	Rms radii (fm)	Uncertainty (fm)	Magnetic moment (μ_N) info	Magnetic moment (μ_N)	Uncertainty (μ_N)	Quadrupole moment (b) info	Quadrupole moment (b)	Uncertainty (b)
¹²⁵Cs	125	Cs	47 minutes		1/2	4.7880(62)	4.788	0.0062	1.407(7)	1.407	0.007
¹²⁷Cs	127	Cs	6.2 hours		1/2	4.7936(55)	4.7936	0.0055	1.457(7)	1.457	0.007
¹²⁹Cs	129	Cs	32.1 hours		1/2	4.7981(50)	4.7981	0.005	1.489(8)	1.489	0.008
¹³⁰Cs	130	Cs	29.2 minutes		1	4.7992(49)	4.7992	0.0049	1.458(7)	1.458	0.007	-0.056(6)	-0.056	0.006
¹³¹Cs	131	Cs	9.69 days		5/2	4.8026(47)	4.8026	0.0047	3.536(3)	3.536	0.003	0.59(2)	0.59	0.02
¹³²Cs	132	Cs	6.48 days		2	4.8002(46)	4.8002	0.0046	2.219(7)	2.219	0.007	0.48(2)	0.48	0.02
¹³³Cs	133	Cs	Stable	100	7/2	4.8041(46)	4.8041	0.0046	2.5778(14)	2.5778	0.0014	-0.00343(10)	-0.00343	0.0001
¹³⁴Cs	134	Cs	2.06 years		4	4.8031(46)	4.8031	0.0046	2.9893(14)	2.9893	0.0014	0.37(2)	0.37	0.02
¹³⁵Cs	135	Cs	3x10⁶ years		7/2	4.8067(47)	4.8067	0.0047	2.7283(13)	2.7283	0.0013	0.048(3)	0.048	0.003
¹³⁶Cs	136	Cs	13.2 days		5	4.8059(52)	4.8059	0.0052	3.705(15)	3.705	0.015	0.213(15)	0.213	0.015
¹³⁷Cs	137	Cs	30.1 years		7/2	4.8128(50)	4.8128	0.005	2.8374(14)	2.8374	0.0014	0.048(2)	0.048	0.002
¹³⁸Cs	138	Cs	33.4 minutes		3	4.8255(50)	4.8255	0.005	0.699(4)	0.699	0.004	0.112(17)	0.112	0.017

Isotope	State	Theory	Key1 info	Experiment	Key2 info	Reference1 info	DOI1 info	Reference2 info	DOI2 info
¹³³Cs	6s_1/2			2298.1579425
	7s_1/2			545.818(16)	E105			Guang Yang, Jie Wang, Baodong Yang, and Junmin Wang, Laser Phys. Lett. 13 085702 (2016)	https://doi.org/10.1088/1612-2011/13/8/085702
	8s_1/2			219.08(12)	E104			Jie Wang, Huifeng Liu, Baodong Yang, Jun He and Junmin Wang, Meas. Sci. Technol. 25, 035501 (2014)	https://doi.org/10.1088/0957-023_3/25/3/035501
	9s_1/2			110.1(5)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	6p_1/2			291.9135(15)	E100			D. Das and V. Natarajan, J. Phys. B 41, 035001 (2008)	https://doi.org/10.1088/0953-4075/41/3/035001
	7p_1/2			94.35(4)	E8			D. Feiertag, A. Sahm, and G. zu Putlitz, Z. Physik 255, 93 (1972)	https://doi.org/10.1007/BF01394518
	8p_1/2			42.97(10)	E9			C. Tai, R. Gupta, and W. Happer, Phys. Rev. A 8, 1661 (1973)	https://doi.org/10.1103/PhysRevA.8.1661
	9p_1/2			23.19(15)	E10			P. Tsekeris, J. Farley, and R. Gupta, Phys. Rev. A 11, 2202 (1975)	https://doi.org/10.1103/PhysRevA.11.2202
	6p_3/2			50.28163(86)	E100			D. Das and V. Natarajan, J. Phys. B 41, 035001 (2008)	https://doi.org/10.1088/0953-4075/41/3/035001
	7p_3/2			16.605(6)	E5			W. Happer, in Atomic Physics 4, edited by G. zu Putlitz, E.W. Weber, and A. Winnacker, Plenum Press, New York, 1974
	8p_3/2			7.626(5)	E5			W. Happer, in Atomic Physics 4, edited by G. zu Putlitz, E.W. Weber, and A. Winnacker, Plenum Press, New York, 1974
	9p_3/2			4.123(3)	E12			S. Rydberg and S. Svanberg, Phys. Scr. 5, 209 (1972)	https://doi.org/10.1088/0031-8949/5/4-5/010
	5d_3/2			48.78(7)	E108			Wo Yei, A. Sieradzan, E. Cerasuolo, and M. D. Havey, Phys. Rev. A 57, 3419 (1998)	https://doi.org/10.1103/PhysRevA.57.3419
	6d_3/2			16.30(15)	E13			C. Tai, W. Happer, and R. Gupta, Phys. Rev. A 12, 736 (1975)	https://doi.org/10.1103/PhysRevA.12.736
	7d_3/2			7.36(7)	E107			Y.-C. Lee, Y.-H. Chang, Y.-Y. Chang, Y.-Y. Chen, C.-C. Tsai, and H.-C. Chui, Appl. Phys. B 105, 391 (2011)	https://doi.org/10.1007/s00340-011-4493-4
	8d_3/2			3.94(8)	E3			E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977)	https://doi.org/10.1103/RevModPhys.49.31
	9D_3/2			2.35(4)	E3			E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977)	https://doi.org/10.1103/RevModPhys.49.31
	10d_3/2			1.51(2)	E3			E. Arimondo, M. Inguscio, and P. Violino, Rev. Mod. Phys. 49, 31 (1977)	https://doi.org/10.1103/RevModPhys.49.31
	5d_5/2			-21.24(5)	E108			Wo Yei, A. Sieradzan, E. Cerasuolo, and M. D. Havey, Phys. Rev. A 57, 3419 (1998)	https://doi.org/10.1103/PhysRevA.57.3419
	6d_5/2			-3.6(10)	E13			C. Tai, W. Happer, and R. Gupta, Phys. Rev. A 12, 736 (1975)	https://doi.org/10.1103/PhysRevA.12.736
	7d_5/2			-1.70(3)	E106			Zerong Wang, Xiaokai Hou, Jiandong Bai and Junmin Wang, Appl. Sci. 10, 8178 (2020)	https://doi.org/10.3390/app10228178
	8d_5/2	-0.68	E2	-0.9(4)	E15	M. Auzinsh, K. Bluss, R. Ferber, F. Gahbauer, A. Jarmola, M. S. Safronova, U. I. Safronova, and M. Tamanis, Phys. Rev. A 75, 022502 (2007)	https://doi.org/10.1103/PhysRevA.75.022502	S. Svanberg and P. Tsekeris, Phys. Rev. A 11, 1125 (1975)	https://doi.org/10.1103/PhysRevA.11.1125
	9d_5/2			-0.43(4)	E2			M. Auzinsh, K. Bluss, R. Ferber, F. Gahbauer, A. Jarmola, M. S. Safronova, U. I. Safronova, and M. Tamanis, Phys. Rev. A 75, 022502 (2007)	https://doi.org/10.1103/PhysRevA.75.022502
	10d_5/2			-0.34(3)	E2			M. Auzinsh, K. Bluss, R. Ferber, F. Gahbauer, A. Jarmola, M. S. Safronova, U. I. Safronova, and M. Tamanis, Phys. Rev. A 75, 022502 (2007)	https://doi.org/10.1103/PhysRevA.75.022502
	10s_1/2			63.2(3)	E16			P. Tsekeris, R. Gupta, W. Happer, G. Belin, and S. Svanberg, Phys. Lett. A 48, 101 (1974)	https://doi.org/10.1016/0375-9601(74)90418-6
	11s_1/2			38.81(23)	E109			Zong-Syun He, Jyh-Hung Tsai, Ming-Tsung Lee, Yung-Yung Chang, Chin-Chun Tsai, and Thou-Jen Whang, J. Phys. Soc. Jpn. 81, 124302 (2012)	https://doi.org/10.1143/JPSJ.81.124302
	12s_1/2			26.31(10)	E17			P. Tsekeris and B. Gupta, Phys. Rev. A 11, 455 (1975)	https://doi.org/10.1103/PhysRevA.11.455
	13s_1/2			18.4(1)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	14s_1/2			13.4(1)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	15s_1/2			10.1(1)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	16s_1/2			7.73(5)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	17s_1/2			6.06(10)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530
	10p_1/2			13.9(2)	E6			J. Farley, P. Tsekeris, and R. Gupta, Phys. Rev. A 15, 1530 (1977)	https://doi.org/10.1103/PhysRevA.15.1530

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