Isotopes of Caesium

List of known isotopes of the element Caesium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
¹¹²Cs	0.49 ±3 ms	syn.	(1+)	—	1.119·10⁸ ±124 keV/c²	1994
¹¹³Cs	17.7 ±4 us	syn.	(3/2+)	—	1.129·10⁸ ±9.207 keV/c²	1984
¹¹⁴Cs	0.57 ±2 s	syn.	(1+)	—	1.139·10⁸ ±91.32 keV/c²	1978
¹¹⁵Cs	1.4 ±8 s	syn.	—	—	1.149·10⁸ ±110 keV/c²	1978
¹¹⁶Cs	0.7 ±4 s	syn.	(1+)	—	1.159·10⁸ ±108 keV/c²	1975
¹¹⁷Cs	8.4 ±6 s	syn.	(9/2+)	—	1.169·10⁸ ±67 keV/c²	1972
¹¹⁸Cs	14 ±2 s	syn.	2(-)	4.783 ±0.0092 fm	1.179·10⁸ ±13.69 keV/c²	1969
¹¹⁹Cs	43 ±2 s	syn.	9/2+	4.789 ±0.0089 fm	1.189·10⁸ ±14.96 keV/c²	1978
¹²⁰Cs	61.3 ±11 s	syn.	2(+)	4.791 ±0.0075 fm	1.199·10⁸ ±10.7 keV/c²	1969
¹²¹Cs	155 ±4 s	syn.	3/2(+)	4.776 ±0.0078 fm	1.209·10⁸ ±15.34 keV/c²	1969
¹²²Cs	21.18 ±19 s	syn.	1+	4.777 ±0.007 fm	1.219·10⁸ ±36.16 keV/c²	1969
¹²³Cs	5.86 ±10 m	syn.	1/2(+)	4.782 ±0.007 fm	1.229·10⁸ ±13 keV/c²	1954
¹²⁴Cs	30.9 ±4 s	syn.	1+	4.782 ±0.0062 fm	1.239·10⁸ ±9.823 keV/c²	1969
¹²⁵Cs	46.7 ±1 m	syn.	1/2(+)	4.788 ±0.0062 fm	1.249·10⁸ ±8.304 keV/c²	1954
¹²⁶Cs	1.643 ±17 m	syn.	1+	4.787 ±0.0056 fm	1.259·10⁸ ±11.12 keV/c²	1954
¹²⁷Cs	6.25 ±10 h	syn.	1/2+	4.793 ±0.0055 fm	1.269·10⁸ ±5.987 keV/c²	1950
¹²⁸Cs	3.64 ±14 m	syn.	1+	4.792 ±0.0052 fm	1.279·10⁸ ±5.771 keV/c²	1951
¹²⁹Cs	32.06 ±6 h	syn.	1/2+	4.798 ±0.005 fm	1.289·10⁸ ±4.888 keV/c²	1950
¹³⁰Cs	29.21 ±4 m	syn.	1+	4.799 ±0.0049 fm	1.299·10⁸ ±8.971 keV/c²	1952
¹³¹Cs	9.689 ±16 d	syn.	5/2+	4.802 ±0.0047 fm	1.309·10⁸ ±0.19 keV/c²	1947
¹³²Cs	6.48 ±6 d	syn.	2+	4.8 ±0.0046 fm	1.319·10⁸ ±1.112 keV/c²	1953
¹³³Cs	stab.	100 %	7/2+	4.804 ±0.0046 fm	1.329·10⁸ ±0.008 keV/c²	1921
¹³⁴Cs	2.065 ±4 a	syn.	4+	4.803 ±0.0046 fm	1.339·10⁸ ±0.017 keV/c²	1940
¹³⁵Cs	2.3·10⁶ ±3 a	syn.	7/2+	4.806 ±0.0047 fm	1.349·10⁸ ±0.39 keV/c²	1949
¹³⁶Cs	13.01 ±5 d	syn.	5+	4.805 ±0.0052 fm	1.359·10⁸ ±2.01 keV/c²	1951
¹³⁷Cs	30.08 ±9 a	syn.	7/2+	4.812 ±0.005 fm	1.369·10⁸ ±0.324 keV/c²	1951
¹³⁸Cs	32.5 ±2 m	syn.	3-	4.825 ±0.005 fm	1.379·10⁸ ±9.831 keV/c²	1943
¹³⁹Cs	9.27 ±5 m	syn.	7/2+	4.842 ±0.0069 fm	1.389·10⁸ ±3.364 keV/c²	1939
¹⁴⁰Cs	63.7 ±3 s	syn.	1-	4.855 ±0.0088 fm	1.399·10⁸ ±8.801 keV/c²	1950
¹⁴¹Cs	24.84 ±16 s	syn.	7/2+	4.868 ±0.0108 fm	1.409·10⁸ ±9.871 keV/c²	1962
¹⁴²Cs	1.684 ±14 s	syn.	0-	4.882 ±0.0132 fm	1.419·10⁸ ±7.586 keV/c²	1962
¹⁴³Cs	1.791 ±7 s	syn.	3/2+	4.896 ±0.0151 fm	1.429·10⁸ ±8.13 keV/c²	1962
¹⁴⁴Cs	0.994 ±6 s	syn.	1(-)	4.905 ±0.0161 fm	1.439·10⁸ ±21.61 keV/c²	1967
¹⁴⁵Cs	0.587 ±5 s	syn.	3/2+	4.918 ±0.0191 fm	1.449·10⁸ ±9.733 keV/c²	1971
¹⁴⁶Cs	0.322 ±13 s	syn.	1-	4.928 ±0.0193 fm	1.459·10⁸ ±3.106 keV/c²	1971
¹⁴⁷Cs	0.2295 ±10 s	syn.	(3/2+)	—	1.469·10⁸ ±9 keV/c²	1978
¹⁴⁸Cs	146 ±6 ms	syn.	—	—	1.479·10⁸ ±14 keV/c²	1978
¹⁴⁹Cs	107 ±6 ms	syn.	—	—	1.489·10⁸ ±429 keV/c²	1979
¹⁵⁰Cs	84 ±8 ms	syn.	—	—	1.499·10⁸ ±429 keV/c²	1979
¹⁵¹Cs	69 ±26 ms	syn.	—	—	1.509·10⁸ ±537 keV/c²	1979
¹⁵²Cs	50 ms	syn.	—	—	1.519·10⁸ ±537 keV/c²	1987

112CsCaesium-112

Classification	z: 55; n: 57; m: 112
Half life	0.49 ±3 ms
Natural abundance	synthetic nuclide
Spin/parity	(1+)
Decay modes	proton emission; α decay
Discovery	1994
Mass excess	-46,420 ±116 keV
Binding energy	8,102 ±1 keV
Single-particle energy	-816.3 ±4.068 keV
Neutron separation energy	11,580 ±231 keV
Q value for electron capture	13,610 ±116.2 keV

Point at nuclide Decay chain of Caesium-112

113CsCaesium-113

Classification	z: 55; n: 58; m: 113
Half life	17.7 ±4 us
Natural abundance	synthetic nuclide
Spin/parity	(3/2+)
Decay modes	proton emission
Discovery	1984
Mass excess	-51,770 ±8.577 keV
Binding energy	8,148 ±0.0759 keV
Single-particle energy	-972.9 ±2.228 keV
Neutron separation energy	13,420 ±116 keV
Q value for electron capture	10,430 ±10.97 keV
β⁻ decay energy	-12,060 ±300 keV

Point at nuclide Decay chain of Caesium-113

114CsCaesium-114

Classification	z: 55; n: 59; m: 114
Half life	0.57 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	(1+)
Decay modes	electron capture + β⁺ decay; electron capture + proton emission; electron capture + α decay
Discovery	1978
Mass excess	-54,690 ±85.06 keV
Binding energy	8,173 ±0.7462 keV
Single-particle energy	-228.8 ±85.34 keV
Neutron separation energy	10,990 ±85.49 keV
Q value for electron capture	12,390 ±85.79 keV
β⁻ decay energy	-8,781 ±133.3 keV
β⁻ decay energy with neutron	-23,050 ±312 keV

Point at nuclide Decay chain of Caesium-114

115CsCaesium-115

Classification	z: 55; n: 60; m: 115
Half life	1.4 ±8 s
Natural abundance	synthetic nuclide
Decay modes	electron capture + β⁺ decay; β⁺ decay + proton emission
Discovery	1978
Mass excess	-59,700 ±102 keV
Binding energy	8,216 ±1 keV
Single-particle energy	-97 ±103 keV
Neutron separation energy	13,080 ±133 keV
Q value for electron capture	8,957 ±102.7 keV
β⁻ decay energy	-10,780 ±225 keV
β⁻ decay energy with neutron	-21,870 ±145 keV

Point at nuclide Decay chain of Caesium-115

116CsCaesium-116

Classification	z: 55; n: 61; m: 116
Half life	0.7 ±4 s
Natural abundance	synthetic nuclide
Spin/parity	(1+)
Decay modes	electron capture + β⁺ decay; electron capture + proton emission; electron capture + α decay
Discovery	1975
Mass excess	-62,050 ±100 keV
Binding energy	8,235 ±1 keV
Single-particle energy	675 ±101 keV
Neutron separation energy	10,410 ±143 keV
Q value for electron capture	11,000 ±100.8 keV
β⁻ decay energy	-7,663 ±224 keV
β⁻ decay energy with neutron	-21,200 ±224 keV

Point at nuclide Decay chain of Caesium-116

117CsCaesium-117

Classification	z: 55; n: 62; m: 117
Half life	8.4 ±6 s
Natural abundance	synthetic nuclide
Spin/parity	(9/2+)
Decay modes	electron capture + β⁺ decay
Discovery	1972
Mass excess	-66,500 ±62.41 keV
Binding energy	8,271 ±0.5334 keV
Single-particle energy	735.1 ±63.75 keV
Neutron separation energy	12,520 ±118 keV
Q value for electron capture	7,692 ±63.26 keV
β⁻ decay energy	-9,036 ±258 keV
β⁻ decay energy with neutron	-20,190 ±210 keV

Point at nuclide Decay chain of Caesium-117

118CsCaesium-118

Classification	z: 55; n: 63; m: 118
Half life	14 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	2(-)
Decay modes	electron capture + β⁺ decay; electron capture + proton emission; electron capture + α decay
Discovery	1969
Mass excess	-68,410 ±12.75 keV
Binding energy	8,286 ±0.1081 keV
Single-particle energy	1,513 ±16.44 keV
Neutron separation energy	9,987 ±63.69 keV
Q value for electron capture	9,669 ±16.44 keV
β⁻ decay energy	-6,210 ±201 keV
β⁻ decay energy with neutron	-19,030 ±250.6 keV
Magnetic dipole moment	3.87 ±0.005 μN
Electric quadrupole moment	1.31 ±0.17 b

Point at nuclide Decay chain of Caesium-118

119CsCaesium-119

Classification	z: 55; n: 64; m: 119
Half life	43 ±2 s
Natural abundance	synthetic nuclide
Spin/parity	9/2+
Decay modes	electron capture + β⁺ decay
Discovery	1978
Mass excess	-72,310 ±13.94 keV
Binding energy	8,317 ±0.1171 keV
Single-particle energy	1,514 ±17.37 keV
Neutron separation energy	11,960 ±18.89 keV
Q value for electron capture	6,489 ±17.37 keV
β⁻ decay energy	-7,715 ±200.7 keV
β⁻ decay energy with neutron	-18,180 ±201 keV
Magnetic dipole moment	5.45 ±0.03 μN
Electric quadrupole moment	2.65 ±0.17 b

Point at nuclide Decay chain of Caesium-119

120CsCaesium-120

Classification	z: 55; n: 65; m: 120
Half life	61.3 ±11 s
Natural abundance	synthetic nuclide
Spin/parity	2(+)
Decay modes	electron capture + β⁺ decay; β⁺ decay + α decay; β⁺ decay + proton emission
Discovery	1969
Mass excess	-73,890 ±9.97 keV
Binding energy	8,328 ±0.0831 keV
Single-particle energy	2,383 ±14.39 keV
Neutron separation energy	9,654 ±17.13 keV
Q value for electron capture	8,283 ±15.46 keV
β⁻ decay energy	-5,000 ±300 keV
β⁻ decay energy with neutron	-17,370 ±200.5 keV
Magnetic dipole moment	3.86 ±0.02 μN
Electric quadrupole moment	1.36 ±0.07 b

Point at nuclide Decay chain of Caesium-120

121CsCaesium-121

Classification	z: 55; n: 66; m: 121
Half life	155 ±4 s
Natural abundance	synthetic nuclide
Spin/parity	3/2(+)
Decay modes	electron capture + β⁺ decay
Discovery	1969
Mass excess	-77,110 ±14.29 keV
Binding energy	8,352 ±0.1181 keV
Single-particle energy	2,218 ±18.54 keV
Neutron separation energy	11,280 ±17.42 keV
Q value for electron capture	5,378 ±17.58 keV
β⁻ decay energy	-6,358 ±141.1 keV
β⁻ decay energy with neutron	-16,290 ±300.5 keV
Magnetic dipole moment	0.769 ±0.004 μN
Electric quadrupole moment	0.79 ±0.04 b

Point at nuclide Decay chain of Caesium-121

122CsCaesium-122

Classification	z: 55; n: 67; m: 122
Half life	21.18 ±19 s
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay
Discovery	1969
Mass excess	-78,150 ±33.68 keV
Binding energy	8,359 ±0.2761 keV
Single-particle energy	2,952 ±35.2 keV
Neutron separation energy	9,113 ±36.59 keV
Q value for electron capture	7,210 ±35.47 keV
β⁻ decay energy	-3,536 ±43.76 keV
β⁻ decay energy with neutron	-15,480 ±145.8 keV
Magnetic dipole moment	0.133 ±0.002 μN
Electric quadrupole moment	-0.179 ±0.01 b

Point at nuclide Decay chain of Caesium-122

123CsCaesium-123

Classification	z: 55; n: 68; m: 123
Half life	5.86 ±10 m
Natural abundance	synthetic nuclide
Spin/parity	1/2(+)
Decay modes	electron capture + β⁺ decay
Discovery	1954
Mass excess	-81,050 ±12.1 keV
Binding energy	8,380 ±0.0985 keV
Single-particle energy	2,977 ±16.43 keV
Neutron separation energy	10,970 ±35.79 keV
Q value for electron capture	4,204 ±15.41 keV
β⁻ decay energy	-5,389 ±17.12 keV
β⁻ decay energy with neutron	-14,510 ±30.45 keV
Magnetic dipole moment	1.375 ±0.007 μN

Point at nuclide Decay chain of Caesium-123

124CsCaesium-124

Classification	z: 55; n: 69; m: 124
Half life	30.9 ±4 s
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay
Discovery	1969
Mass excess	-81,750 ±9.151 keV
Binding energy	8,383 ±0.0738 keV
Single-particle energy	3,781 ±13.21 keV
Neutron separation energy	8,768 ±15.17 keV
Q value for electron capture	5,926 ±9.251 keV
β⁻ decay energy	-2,652 ±15.48 keV
β⁻ decay energy with neutron	-14,160 ±15.17 keV
Magnetic dipole moment	0.672 ±0.003 μN
Electric quadrupole moment	-0.69 ±0.04 b

Point at nuclide Decay chain of Caesium-124

125CsCaesium-125

Classification	z: 55; n: 70; m: 125
Half life	46.7 ±1 m
Natural abundance	synthetic nuclide
Spin/parity	1/2(+)
Decay modes	electron capture + β⁺ decay
Discovery	1954
Mass excess	-84,090 ±7.736 keV
Binding energy	8,399 ±0.0619 keV
Single-particle energy	3,711 ±7.783 keV
Neutron separation energy	10,410 ±11.98 keV
Q value for electron capture	3,109 ±7.864 keV
β⁻ decay energy	-4,421 ±13.44 keV
β⁻ decay energy with neutron	-13,080 ±14.69 keV
Magnetic dipole moment	1.407 ±0.007 μN

Point at nuclide Decay chain of Caesium-125

126CsCaesium-126

Classification	z: 55; n: 71; m: 126
Half life	1.643 ±17 m
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay
Discovery	1954
Mass excess	-84,360 ±10.35 keV
Binding energy	8,399 ±0.0822 keV
Single-particle energy	4,440 ±10.45 keV
Neutron separation energy	8,332 ±12.92 keV
Q value for electron capture	4,795 ±10.35 keV
β⁻ decay energy	-1,681 ±16.23 keV
β⁻ decay energy with neutron	-12,760 ±15.1 keV
Magnetic dipole moment	0.776 ±0.004 μN
Electric quadrupole moment	-0.64 ±0.03 b

Point at nuclide Decay chain of Caesium-126

127CsCaesium-127

Classification	z: 55; n: 72; m: 127
Half life	6.25 ±10 h
Natural abundance	synthetic nuclide
Spin/parity	1/2+
Decay modes	electron capture + β⁺ decay
Discovery	1950
Mass excess	-86,250 ±5.578 keV
Binding energy	8,411 ±0.0439 keV
Single-particle energy	4,382 ±5.577 keV
Neutron separation energy	9,960 ±11.76 keV
Q value for electron capture	2,080 ±6.916 keV
β⁻ decay energy	-3,423 ±12.65 keV
β⁻ decay energy with neutron	-11,650 ±13.68 keV
Magnetic dipole moment	1.457 ±0.007 μN

Point at nuclide Decay chain of Caesium-127

128CsCaesium-128

Classification	z: 55; n: 73; m: 128
Half life	3.64 ±14 m
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay
Discovery	1951
Mass excess	-85,940 ±5.376 keV
Binding energy	8,406 ±0.042 keV
Single-particle energy	4,899 ±6.754 keV
Neutron separation energy	7,763 ±7.746 keV
Q value for electron capture	3,928 ±5.376 keV
β⁻ decay energy	-562.7 ±5.612 keV
β⁻ decay energy with neutron	-11,190 ±12.56 keV
Magnetic dipole moment	0.972 ±0.005 μN
Electric quadrupole moment	-0.54 ±0.03 b

Point at nuclide Decay chain of Caesium-128

129CsCaesium-129

Classification	z: 55; n: 74; m: 129
Half life	32.06 ±6 h
Natural abundance	synthetic nuclide
Spin/parity	1/2+
Decay modes	electron capture + β⁺ decay
Discovery	1950
Mass excess	-87,500 ±4.553 keV
Binding energy	8,416 ±0.0353 keV
Single-particle energy	4,927 ±4.553 keV
Neutron separation energy	9,638 ±7.045 keV
Q value for electron capture	1,197 ±4.55 keV
β⁻ decay energy	-2,439 ±10.56 keV
β⁻ decay energy with neutron	-10,210 ±4.828 keV
Magnetic dipole moment	1.489 ±0.008 μN

Point at nuclide Decay chain of Caesium-129

130CsCaesium-130

Classification	z: 55; n: 75; m: 130
Half life	29.21 ±4 m
Natural abundance	synthetic nuclide
Spin/parity	1+
Decay modes	electron capture + β⁺ decay; β⁻ decay
Discovery	1952
Mass excess	-86,900 ±8.357 keV
Binding energy	8,408 ±0.0643 keV
Single-particle energy	5,492 ±8.356 keV
Neutron separation energy	7,472 ±9.516 keV
Q value for electron capture	2,980 ±8.35 keV
β⁻ decay energy	357 ±8.361 keV
β⁻ decay energy with neutron	-9,911 ±13.42 keV
Magnetic dipole moment	1.458 ±0.007 μN
Electric quadrupole moment	-0.056 ±0.006 b

Point at nuclide Decay chain of Caesium-130

131CsCaesium-131

Classification	z: 55; n: 76; m: 131
Half life	9.689 ±16 d
Natural abundance	synthetic nuclide
Spin/parity	5/2+
Decay modes	electron capture (EC)
Discovery	1947
Mass excess	-88,060 ±0.177 keV
Binding energy	8,415 ±0.0014 keV
Single-particle energy	5,464 ±0.1773 keV
Neutron separation energy	9,227 ±8.358 keV
Q value for electron capture	358 ±0.177 keV
β⁻ decay energy	-1,377 ±0.4515 keV
β⁻ decay energy with neutron	-8,871 ±0.3374 keV
Magnetic dipole moment	3.536 ±0.003 μN
Electric quadrupole moment	0.59 ±0.02 b

Point at nuclide Decay chain of Caesium-131

132CsCaesium-132

Classification	z: 55; n: 77; m: 132
Half life	6.48 ±6 d
Natural abundance	synthetic nuclide
Spin/parity	2+
Decay modes	electron capture + β⁺ decay; β⁻ decay
Discovery	1953
Mass excess	-87,160 ±1.036 keV
Binding energy	8,405 ±0.0079 keV
Single-particle energy	6,028 ±1.035 keV
Neutron separation energy	7,168 ±1.05 keV
Q value for electron capture	2,126 ±1.036 keV
β⁻ decay energy	1,282 ±1.477 keV
β⁻ decay energy with neutron	-8,546 ±1.116 keV
Magnetic dipole moment	2.219 ±0.007 μN
Electric quadrupole moment	0.48 ±0.02 b

Point at nuclide Decay chain of Caesium-132

133CsCaesium-133

Classification	z: 55; n: 78; m: 133
Half life	stable nuclide
Natural abundance	100 %
Spin/parity	7/2+
Discovery	1921
Mass excess	-88,080 ±0.008 keV
Binding energy	8,409 ±3·10^-4 keV
Single-particle energy	6,080 ±0.0066 keV
Neutron separation energy	8,989 ±1.035 keV
Q value for electron capture	-427.4 ±2.4 keV
β⁻ decay energy	-517.5 ±0.992 keV
β⁻ decay energy with neutron	-7,708 ±1.053 keV
Magnetic dipole moment	2.577 ±0.0014 μN
Electric quadrupole moment	-0.00343 ±1·10^-4 b

Point at nuclide

134CsCaesium-134

Classification	z: 55; n: 79; m: 134
Half life	2.065 ±4 a
Natural abundance	synthetic nuclide
Spin/parity	4+
Decay modes	β⁻ decay; electron capture (EC)
Discovery	1940
Mass excess	-86,900 ±0.016 keV
Binding energy	8,398 ±3·10^-4 keV
Single-particle energy	6,536 ±2.4 keV
Neutron separation energy	6,891 ±0.0144 keV
Q value for electron capture	1,234 ±0.017 keV
β⁻ decay energy	2,058 ±0.2508 keV
β⁻ decay energy with neutron	-7,409 ±0.9921 keV
Magnetic dipole moment	2.989 ±0.0014 μN
Electric quadrupole moment	0.37 ±0.02 b

Point at nuclide Decay chain of Caesium-134

135CsCaesium-135

Classification	z: 55; n: 80; m: 135
Half life	2.3·10⁶ ±3 a
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	β⁻ decay
Discovery	1949
Mass excess	-87,590 ±0.364 keV
Binding energy	8,401 ±0.0027 keV
Single-particle energy	6,745 ±0.3635 keV
Neutron separation energy	8,762 ±0.3636 keV
Q value for electron capture	-1,169 ±3.686 keV
β⁻ decay energy	268.6 ±0.2862 keV
β⁻ decay energy with neutron	-6,704 ±0.3021 keV
Magnetic dipole moment	2.728 ±0.0013 μN
Electric quadrupole moment	0.048 ±0.003 b

Point at nuclide Decay chain of Caesium-135

136CsCaesium-136

Classification	z: 55; n: 81; m: 136
Half life	13.01 ±5 d
Natural abundance	synthetic nuclide
Spin/parity	5+
Decay modes	β⁻ decay
Discovery	1951
Mass excess	-86,340 ±1.873 keV
Binding energy	8,389 ±0.0138 keV
Single-particle energy	7,214 ±4.11 keV
Neutron separation energy	6,828 ±1.879 keV
Q value for electron capture	90.31 ±1.873 keV
β⁻ decay energy	2,548 ±1.857 keV
β⁻ decay energy with neutron	-6,560 ±1.857 keV
Magnetic dipole moment	3.705 ±0.015 μN
Electric quadrupole moment	0.213 ±0.015 b

Point at nuclide Decay chain of Caesium-136

137CsCaesium-137

Classification	z: 55; n: 82; m: 137
Half life	30.08 ±9 a
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	β⁻ decay
Discovery	1951
Mass excess	-86,550 ±0.302 keV
Binding energy	8,388 ±0.0022 keV
Single-particle energy	7,405 ±0.3022 keV
Neutron separation energy	8,278 ±1.866 keV
Q value for electron capture	-4,163 ±0.319 keV
β⁻ decay energy	1,175 ±0.1723 keV
β⁻ decay energy with neutron	-5,731 ±0.1854 keV
Magnetic dipole moment	2.837 ±0.0014 μN
Electric quadrupole moment	0.048 ±0.002 b

Point at nuclide Decay chain of Caesium-137

138CsCaesium-138

Classification	z: 55; n: 83; m: 138
Half life	32.5 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	3-
Decay modes	β⁻ decay
Discovery	1943
Mass excess	-82,890 ±9.158 keV
Binding energy	8,360 ±0.0664 keV
Single-particle energy	7,792 ±9.159 keV
Neutron separation energy	4,412 ±9.16 keV
Q value for electron capture	-2,915 ±9.578 keV
β⁻ decay energy	5,374 ±9.158 keV
β⁻ decay energy with neutron	-3,237 ±9.158 keV
Magnetic dipole moment	0.699 ±0.004 μN
Electric quadrupole moment	0.112 ±0.017 b

Point at nuclide Decay chain of Caesium-138

139CsCaesium-139

Classification	z: 55; n: 84; m: 139
Half life	9.27 ±5 m
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	β⁻ decay
Discovery	1939
Mass excess	-80,710 ±3.134 keV
Binding energy	8,342 ±0.0225 keV
Single-particle energy	8,017 ±4.205 keV
Neutron separation energy	5,885 ±9.676 keV
Q value for electron capture	-5,057 ±3.796 keV
β⁻ decay energy	4,212 ±3.123 keV
β⁻ decay energy with neutron	-510.7 ±3.123 keV
Magnetic dipole moment	2.688 ±0.004 μN
Electric quadrupole moment	-0.063 ±0.014 b

Point at nuclide Decay chain of Caesium-139

140CsCaesium-140

Classification	z: 55; n: 85; m: 140
Half life	63.7 ±3 s
Natural abundance	synthetic nuclide
Spin/parity	1-
Decay modes	β⁻ decay
Discovery	1950
Mass excess	-77,050 ±8.199 keV
Binding energy	8,314 ±0.0586 keV
Single-particle energy	8,694 ±8.474 keV
Neutron separation energy	4,419 ±8.777 keV
Q value for electron capture	-4,064 ±8.523 keV
β⁻ decay energy	6,218 ±9.867 keV
β⁻ decay energy with neutron	-207.2 ±8.202 keV
Magnetic dipole moment	0.134 ±0.001 μN
Electric quadrupole moment	-0.094 ±0.015 b

Point at nuclide Decay chain of Caesium-140

141CsCaesium-141

Classification	z: 55; n: 86; m: 141
Half life	24.84 ±16 s
Natural abundance	synthetic nuclide
Spin/parity	7/2+
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1962
Mass excess	-74,480 ±9.195 keV
Binding energy	8,294 ±0.0652 keV
Single-particle energy	8,779 ±9.485 keV
Neutron separation energy	5,498 ±12.19 keV
Q value for electron capture	-6,281 ±9.638 keV
β⁻ decay energy	5,255 ±9.617 keV
β⁻ decay energy with neutron	719.2 ±11.63 keV
Magnetic dipole moment	2.431 ±0.01 μN
Electric quadrupole moment	-0.42 ±0.07 b

Point at nuclide Decay chain of Caesium-141

142CsCaesium-142

Classification	z: 55; n: 87; m: 142
Half life	1.684 ±14 s
Natural abundance	synthetic nuclide
Spin/parity	0-
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1962
Mass excess	-70,520 ±7.067 keV
Binding energy	8,264 ±0.0498 keV
Single-particle energy	9,606 ±7.634 keV
Neutron separation energy	4,108 ±11.59 keV
Q value for electron capture	-5,285 ±7.566 keV
β⁻ decay energy	7,327 ±8.362 keV
β⁻ decay energy with neutron	1,146 ±8.844 keV

Point at nuclide Decay chain of Caesium-142

143CsCaesium-143

Classification	z: 55; n: 88; m: 143
Half life	1.791 ±7 s
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1962
Mass excess	-67,680 ±7.573 keV
Binding energy	8,243 ±0.053 keV
Single-particle energy	9,734 ±8.04 keV
Neutron separation energy	5,232 ±10.35 keV
Q value for electron capture	-7,473 ±8.89 keV
β⁻ decay energy	6,261 ±9.73 keV
β⁻ decay energy with neutron	2,095 ±9.612 keV
Magnetic dipole moment	0.869 ±0.004 μN
Electric quadrupole moment	0.44 ±0.03 b

Point at nuclide Decay chain of Caesium-143

144CsCaesium-144

Classification	z: 55; n: 89; m: 144
Half life	0.994 ±6 s
Natural abundance	synthetic nuclide
Spin/parity	1(-)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1967
Mass excess	-63,280 ±20.13 keV
Binding energy	8,211 ±0.1398 keV
Single-particle energy	10,350 ±20.66 keV
Neutron separation energy	3,667 ±21.5 keV
Q value for electron capture	-6,400 ±20.82 keV
β⁻ decay energy	8,495 ±20.41 keV
β⁻ decay energy with neutron	2,594 ±21.23 keV
Magnetic dipole moment	-0.545 ±0.003 μN
Electric quadrupole moment	0.29 ±0.02 b

Point at nuclide Decay chain of Caesium-144

145CsCaesium-145

Classification	z: 55; n: 90; m: 145
Half life	0.587 ±5 s
Natural abundance	synthetic nuclide
Spin/parity	3/2+
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1971
Mass excess	-60,060 ±9.067 keV
Binding energy	8,188 ±0.0625 keV
Single-particle energy	10,470 ±10.5 keV
Neutron separation energy	4,854 ±21.58 keV
Q value for electron capture	-8,562 ±14.39 keV
β⁻ decay energy	7,461 ±12.41 keV
β⁻ decay energy with neutron	3,641 ±11.49 keV
Magnetic dipole moment	0.783 ±0.004 μN
Electric quadrupole moment	0.58 ±0.06 b

Point at nuclide Decay chain of Caesium-145

146CsCaesium-146

Classification	z: 55; n: 91; m: 146
Half life	0.322 ±13 s
Natural abundance	synthetic nuclide
Spin/parity	1-
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1971
Mass excess	-55,320 ±2.893 keV
Binding energy	8,155 ±0.0198 keV
Single-particle energy	11,100 ±11.54 keV
Neutron separation energy	3,327 ±9.517 keV
Q value for electron capture	-7,356 ±24.39 keV
β⁻ decay energy	9,555 ±3.391 keV
β⁻ decay energy with neutron	4,134 ±8.956 keV
Magnetic dipole moment	-0.514 ±0.002 μN
Electric quadrupole moment	0.21 ±0.03 b

Point at nuclide Decay chain of Caesium-146

147CsCaesium-147

Classification	z: 55; n: 92; m: 147
Half life	0.2295 ±10 s
Natural abundance	synthetic nuclide
Spin/parity	(3/2+)
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1978
Mass excess	-51,930 ±8.383 keV
Binding energy	8,131 ±0.057 keV
Single-particle energy	11,250 ±25.62 keV
Neutron separation energy	4,681 ±8.868 keV
Q value for electron capture	-9,521 ±200.1 keV
β⁻ decay energy	8,343 ±21.45 keV
β⁻ decay energy with neutron	4,874 ±8.568 keV

Point at nuclide Decay chain of Caesium-147

148CsCaesium-148

Classification	z: 55; n: 93; m: 148
Half life	146 ±6 ms
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1978
Mass excess	-46,920 ±13.04 keV
Binding energy	8,097 ±0.0881 keV
Single-particle energy	11,800 ±201 keV
Neutron separation energy	3,062 ±15.5 keV
Q value for electron capture	-8,261 ±300.2 keV
β⁻ decay energy	10,630 ±13.12 keV
β⁻ decay energy with neutron	5,281 ±23.66 keV

Point at nuclide Decay chain of Caesium-148

149CsCaesium-149

Classification	z: 55; n: 94; m: 149
Half life	107 ±6 ms
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1979
Mass excess	-43,300 ±400 keV
Binding energy	8,073 ±3 keV
Single-particle energy	11,930 ±500 keV
Neutron separation energy	4,460 ±400 keV
Q value for electron capture	-10,300 ±500 keV
β⁻ decay energy	9,531 ±400 keV
β⁻ decay energy with neutron	6,174 ±400 keV

Point at nuclide Decay chain of Caesium-149

150CsCaesium-150

Classification	z: 55; n: 95; m: 150
Half life	84 ±8 ms
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1979
Mass excess	-38,170 ±400 keV
Binding energy	8,039 ±3 keV
Single-particle energy	12,450 ±500 keV
Neutron separation energy	2,942 ±565 keV
Q value for electron capture	-9,180 ±500 keV
β⁻ decay energy	11,720 ±400 keV
β⁻ decay energy with neutron	6,589 ±400 keV

Point at nuclide Decay chain of Caesium-150

151CsCaesium-151

Classification	z: 55; n: 96; m: 151
Half life	69 ±26 ms
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission
Discovery	1979
Mass excess	-34,280 ±500 keV
Binding energy	8,013 ±3 keV
Single-particle energy	12,570 ±583 keV
Neutron separation energy	4,181 ±640 keV
β⁻ decay energy	10,660 ±640 keV
β⁻ decay energy with neutron	7,539 ±500 keV

Point at nuclide Decay chain of Caesium-151

152CsCaesium-152

Classification	z: 55; n: 97; m: 152
Half life	50 ms
Natural abundance	synthetic nuclide
Decay modes	β⁻ decay; β⁻ decay with neutron emission; β⁻ decay with two-neutron emission
Discovery	1987
Mass excess	-29,130 ±500 keV
Binding energy	7,980 ±3 keV
Neutron separation energy	2,921 ±707 keV
β⁻ decay energy	12,480 ±640 keV
β⁻ decay energy with neutron	7,739 ±640 keV

Point at nuclide Decay chain of Caesium-152

Isotopes of Caesium

112CsCaesium-112ads_clickcall_splitdownload

113CsCaesium-113ads_clickcall_splitdownload

114CsCaesium-114ads_clickcall_splitdownload

115CsCaesium-115ads_clickcall_splitdownload

116CsCaesium-116ads_clickcall_splitdownload

117CsCaesium-117ads_clickcall_splitdownload

118CsCaesium-118ads_clickcall_splitdownload

119CsCaesium-119ads_clickcall_splitdownload

120CsCaesium-120ads_clickcall_splitdownload

121CsCaesium-121ads_clickcall_splitdownload

122CsCaesium-122ads_clickcall_splitdownload

123CsCaesium-123ads_clickcall_splitdownload

124CsCaesium-124ads_clickcall_splitdownload

125CsCaesium-125ads_clickcall_splitdownload

126CsCaesium-126ads_clickcall_splitdownload

127CsCaesium-127ads_clickcall_splitdownload

128CsCaesium-128ads_clickcall_splitdownload

129CsCaesium-129ads_clickcall_splitdownload

130CsCaesium-130ads_clickcall_splitdownload

131CsCaesium-131ads_clickcall_splitdownload

132CsCaesium-132ads_clickcall_splitdownload

133CsCaesium-133ads_clickdownload

134CsCaesium-134ads_clickcall_splitdownload

135CsCaesium-135ads_clickcall_splitdownload

136CsCaesium-136ads_clickcall_splitdownload

137CsCaesium-137ads_clickcall_splitdownload

138CsCaesium-138ads_clickcall_splitdownload

139CsCaesium-139ads_clickcall_splitdownload

140CsCaesium-140ads_clickcall_splitdownload

141CsCaesium-141ads_clickcall_splitdownload

142CsCaesium-142ads_clickcall_splitdownload

143CsCaesium-143ads_clickcall_splitdownload

144CsCaesium-144ads_clickcall_splitdownload

145CsCaesium-145ads_clickcall_splitdownload

146CsCaesium-146ads_clickcall_splitdownload

147CsCaesium-147ads_clickcall_splitdownload

148CsCaesium-148ads_clickcall_splitdownload

149CsCaesium-149ads_clickcall_splitdownload

150CsCaesium-150ads_clickcall_splitdownload

151CsCaesium-151ads_clickcall_splitdownload

152CsCaesium-152ads_clickcall_splitdownload

112CsCaesium-112

113CsCaesium-113

114CsCaesium-114

115CsCaesium-115

116CsCaesium-116

117CsCaesium-117

118CsCaesium-118

119CsCaesium-119

120CsCaesium-120

121CsCaesium-121

122CsCaesium-122

123CsCaesium-123

124CsCaesium-124

125CsCaesium-125

126CsCaesium-126

127CsCaesium-127

128CsCaesium-128

129CsCaesium-129

130CsCaesium-130

131CsCaesium-131

132CsCaesium-132

133CsCaesium-133

134CsCaesium-134

135CsCaesium-135

136CsCaesium-136

137CsCaesium-137

138CsCaesium-138

139CsCaesium-139

140CsCaesium-140

141CsCaesium-141

142CsCaesium-142

143CsCaesium-143

144CsCaesium-144

145CsCaesium-145

146CsCaesium-146

147CsCaesium-147

148CsCaesium-148

149CsCaesium-149

150CsCaesium-150

151CsCaesium-151

152CsCaesium-152