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Isotopes of barium

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Main isotopes^[1]			Decay
Isotope	abundance	half-life(t_1/2)	mode	product
¹³⁰Ba	0.11%	(0.5–2.7)×10²¹ y	εε	¹³⁰Xe
¹³¹Ba	synth	11.52 d	β⁺	¹³¹Cs
¹³²Ba	0.1%	stable
¹³³Ba	synth	10.538 y	ε	¹³³Cs
¹³⁴Ba	2.42%	stable
¹³⁵Ba	6.59%	stable
¹³⁶Ba	7.85%	stable
¹³⁷Ba	11.2%	stable
¹³⁸Ba	71.7%	stable
¹⁴⁰Ba	synth	12.753 d	β⁻	¹⁴⁰La

Standard atomic weightA_r°(Ba)

137.327±0.007^[2]
137.33±0.01 (abridged)^[3]

Naturally occurringbarium (₅₆Ba) is a mix of six stableisotopes and one very long-lived radioactive primordial isotope, barium-130, identified as being unstable by geochemical means (from analysis of the presence of its daughter xenon-130 in rocks) in 2001,^[4]^[5] presumably decaying bydouble electron capture with a half-life of (0.5–2.7)×10²¹ years (about 10¹¹ times the age of the universe). The two measurements are discordant; the above reflects the total range, the value in the table below is a crude average.

With the total range of mass numbers known 114 to 154, there are thirty-three knownradioisotopes in addition to¹³⁰Ba. The longest-lived of these is¹³³Ba, which has a half-life of 10.538 years; all others have half-lives shorter than two weeks. The longest-livedisomers are^133mBa at 38.90 hours and^135m1Ba at 28.11 hours. The analogous^137m1Ba (half-life 2.552 minutes) occurs in the decay of the common fission productcaesium-137.

Barium-114 is theorized to undergocluster decay, emitting a nucleus of stable¹²C to produce¹⁰²Sn. This decay has not been observed, with only an upper limit on the branching ratio of such decay (0.0034%).

List of isotopes

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Nuclide ^{[n 1]}	Z	N	Isotopic mass(Da)^[6] ^{[n 2]}^{[n 3]}	Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 8]}	Natural abundance(mole fraction)
Nuclide ^{[n 1]}	Excitation energy			Half-life^[1]	Decay mode^[1] ^{[n 4]}	Daughter isotope ^{[n 5]}^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 8]}	Normal proportion^[1]	Range of variation
¹¹⁴Ba	56	58	113.95072(11)	460(125) ms	β⁺ (79%)	¹¹⁴Cs	0+
					α (0.9%)	¹¹⁰Xe
					β⁺,p (20%)	¹¹³Xe
					CD (<.0034%)	¹⁰²Sn,¹²C
¹¹⁵Ba	56	59	114.94748(22)#	0.45(5) s	β⁺	¹¹⁵Cs	5/2+#
¹¹⁵Ba	56	59	114.94748(22)#	0.45(5) s	β⁺, p (>15%)	¹¹⁴Xe	5/2+#
¹¹⁶Ba	56	60	115.94162(22)#	1.3(2) s	β⁺ (97%)	¹¹⁶Cs	0+
¹¹⁶Ba	56	60	115.94162(22)#	1.3(2) s	β⁺, p (3%)	¹¹⁵Xe	0+
¹¹⁷Ba	56	61	116.93832(27)	1.75(7) s	β⁺ (87%)	¹¹⁷Cs	(3/2+)
					β⁺, p (13%)	¹¹⁶Xe
					β⁺, α (0.024%)	¹¹³I
¹¹⁸Ba	56	62	117.93323(22)#	5.2(2) s	β⁺	¹¹⁸Cs	0+
¹¹⁹Ba	56	63	118.93066(21)	5.4(3) s	β⁺ (75%)	¹¹⁹Cs	(3/2+)^[7]
¹¹⁹Ba	56	63	118.93066(21)	5.4(3) s	β⁺, p (25%)	¹¹⁸Xe	(3/2+)^[7]
^119mBa^[7]	66.0 keV			360(20) ns	IT	¹¹⁹Ba	(5/2−)
¹²⁰Ba	56	64	119.92604(32)	24(2) s	β⁺	¹²⁰Cs	0+
¹²¹Ba	56	65	120.92405(15)	29.7(15) s	β⁺ (99.98%)	¹²¹Cs	5/2+
¹²¹Ba	56	65	120.92405(15)	29.7(15) s	β⁺, p (0.02%)	¹²⁰Xe	5/2+
¹²²Ba	56	66	121.91990(3)	1.95(15) min	β⁺	¹²²Cs	0+
¹²³Ba	56	67	122.918781(13)	2.7(4) min	β⁺	¹²³Cs	5/2+
^123mBa	120.95(8) keV			830(60) ns	IT	¹²³Ba	1/2+#
¹²⁴Ba	56	68	123.915094(13)	11.0(5) min	β⁺	¹²⁴Cs	0+
¹²⁵Ba	56	69	124.914472(12)	3.3(3) min	β⁺	¹²⁵Cs	1/2+
^125mBa	120(20)# keV			2.76(14) μs	IT	¹²⁵Ba	(7/2−)
¹²⁶Ba	56	70	125.911250(13)	100(2) min	β⁺	¹²⁶Cs	0+
¹²⁷Ba	56	71	126.911091(12)	12.7(4) min	β⁺	¹²⁷Cs	1/2+
^127mBa	80.32(11) keV			1.93(7) s	IT	¹²⁷Ba	7/2−
¹²⁸Ba	56	72	127.9083524(17)	2.43(5) d	EC	¹²⁸Cs	0+
¹²⁹Ba	56	73	128.908683(11)	2.23(11) h	β⁺	¹²⁹Cs	1/2+
^129mBa	8.42(6) keV			2.135(10) h	β⁺	¹²⁹Cs	7/2+
^129mBa	8.42(6) keV			2.135(10) h	IT?	¹²⁹Ba	7/2+
¹³⁰Ba^{[n 9]}	56	74	129.9063260(3)	≈ 1×10²¹ y	εε	¹³⁰Xe	0+	0.0011(1)
^130mBa	2475.12(18) keV			9.54(14) ms	IT	¹³⁰Ba	8−
¹³¹Ba	56	75	130.9069463(4)	11.52(1) d	β⁺	¹³¹Cs	1/2+
^131mBa	187.995(9) keV			14.26(9) min	IT	¹³¹Ba	9/2−
¹³²Ba	56	76	131.9050612(11)	Observationally Stable^{[n 10]}			0+	0.0010(1)
¹³³Ba	56	77	132.9060074(11)	10.5379(16) y	EC	¹³³Cs	1/2+
^133mBa	288.252(9) keV			38.90(6) h	IT (99.99%)	¹³³Ba	11/2−
^133mBa	288.252(9) keV			38.90(6) h	EC (0.0104%)	¹³³Cs	11/2−
¹³⁴Ba^{[n 11]}	56	78	133.90450825(27)	Stable			0+	0.0242(15)
^134mBa	2957.2(5) keV			2.61(13) μs	IT	¹³⁴Ba	10+
¹³⁵Ba	56	79	134.90568845(26)	Stable			3/2+	0.0659(10)
^135m1Ba	268.218(20) keV			28.11(2) h	IT	¹³⁵Ba	11/2−
^135m2Ba	2388.0(5) keV			1.06(4) ms	IT	¹³⁵Ba	(23/2+)
¹³⁶Ba	56	80	135.90457580(26)	Stable			0+	0.0785(24)
^136m1Ba	2030.535(18) keV			308.4(19) ms	IT	¹³⁶Ba	7−
^136m2Ba	3357.19(25) keV			91(2) ns	IT	¹³⁶Ba	10+
¹³⁷Ba^{[n 11]}	56	81	136.90582721(27)	Stable			3/2+	0.1123(23)
^137m1Ba^{[n 11]}	661.659(3) keV			2.552(1) min	IT	¹³⁷Ba	11/2−
^137m2Ba	2349.1(5) keV			589(20) ns	IT	¹³⁷Ba	(19/2−)
¹³⁸Ba^{[n 11]}	56	82	137.90524706(27)	Stable			0+	0.7170(29)
^138mBa	2090.536(21) keV			850(100) ns	IT	¹³⁸Ba	6+
¹³⁹Ba^{[n 11]}	56	83	138.90884116(27)	82.93(9) min	β⁻	¹³⁹La	7/2−
¹⁴⁰Ba^{[n 11]}	56	84	139.910608(8)	12.7534(21) d	β⁻	¹⁴⁰La	0+
¹⁴¹Ba	56	85	140.914404(6)	18.27(7) min	β⁻	¹⁴¹La	3/2−
¹⁴²Ba	56	86	141.916433(6)	10.6(2) min	β⁻	¹⁴²La	0+
¹⁴³Ba	56	87	142.920625(7)	14.5(3) s	β⁻	¹⁴³La	5/2−
¹⁴⁴Ba	56	88	143.922955(8)	11.73(8) s	β⁻	¹⁴⁴La	0+
¹⁴⁵Ba	56	89	144.927518(9)	4.31(16) s	β⁻	¹⁴⁵La	5/2−
¹⁴⁶Ba	56	90	145.9303632(19)	2.15(4) s	β⁻	¹⁴⁶La	0+
¹⁴⁷Ba	56	91	146.935304(21)	893(1) ms	β⁻ (99.93%)	¹⁴⁷La	5/2−
¹⁴⁷Ba	56	91	146.935304(21)	893(1) ms	β⁻, n (0.07%)	¹⁴⁶La	5/2−
¹⁴⁸Ba	56	92	147.9382230(16)	620(5) ms	β⁻ (99.6%)	¹⁴⁸La	0+
¹⁴⁸Ba	56	92	147.9382230(16)	620(5) ms	β⁻, n (0.4%)	¹⁴⁷La	0+
¹⁴⁹Ba	56	93	148.9432840(27)	349(4) ms	β⁻ (96.1%)	¹⁴⁹La	3/2−#
¹⁴⁹Ba	56	93	148.9432840(27)	349(4) ms	β⁻, n (3.9%)	¹⁴⁸La	3/2−#
¹⁵⁰Ba	56	94	149.946441(6)	258(5) ms	β⁻ (99.0%)	¹⁵⁰La	0+
¹⁵⁰Ba	56	94	149.946441(6)	258(5) ms	β⁻, n (1.0%)	¹⁴⁹La	0+
¹⁵¹Ba	56	95	150.95176(43)#	167(5) ms	β⁻	¹⁵¹La	3/2−#
¹⁵¹Ba	56	95	150.95176(43)#	167(5) ms	β⁻, n?	¹⁵⁰La	3/2−#
¹⁵²Ba	56	96	151.95533(43)#	139(8) ms	β⁻	¹⁵²La	0+
¹⁵²Ba	56	96	151.95533(43)#	139(8) ms	β⁻, n?	¹⁵¹La	0+
¹⁵³Ba	56	97	152.96085(43)#	113(39) ms	β⁻	¹⁵³La	5/2−#
					β⁻, n?	¹⁵²La
					β⁻, 2n?	¹⁵¹La
¹⁵⁴Ba	56	98	153.96466(54)#	53(48) ms	β⁻	¹⁵⁴La	0+
This table header & footer: view

^^mBa – Excitednuclear isomer.
^( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
^# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
^Modes of decay:
EC: Electron capture
CD: Cluster decay
IT: Isomeric transition
n: Neutron emission
p: Proton emission
^Bold italics symbol as daughter – Daughter product is nearly stable.
^Bold symbol as daughter – Daughter product is stable.
^( ) spin value – Indicates spin with weak assignment arguments.
^# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
^Primordial radionuclide
^Believed to undergo β⁺β⁺ decay to¹³²Xe with ahalf-life over 3×10²⁰ years
^^a ^b ^c ^d ^e ^fFission product

References

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^^a ^b ^c ^d ^eKondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021)."The NUBASE2020 evaluation of nuclear properties"(PDF).Chinese Physics C.45 (3) 030001.doi:10.1088/1674-1137/abddae.
^"Standard Atomic Weights: Barium".CIAAW. 1985.
^Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04)."Standard atomic weights of the elements 2021 (IUPAC Technical Report)".Pure and Applied Chemistry.doi:10.1515/pac-2019-0603.ISSN 1365-3075.
^Meshik, A.P.; Hohenberg, C.M.; Pravdivtseva, O.V.; Kapusta, Y.S. (2001)."Weak decay of¹³⁰Ba and¹³²Ba: Geochemical measurements".Physical Review C.64 (3): 035205–1–035205–6.Bibcode:2001PhRvC..64c5205M.doi:10.1103/PhysRevC.64.035205.
^M. Pujol; B. Marty; P. Burnard; P. Philippot (2009). "Xenon in Archean barite: Weak decay of¹³⁰Ba, mass-dependent isotopic fractionation and implication for barite formation".Geochimica et Cosmochimica Acta.73 (22):6834–6846.Bibcode:2009GeCoA..73.6834P.doi:10.1016/j.gca.2009.08.002.
^Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*".Chinese Physics C.45 (3) 030003.doi:10.1088/1674-1137/abddaf.
^^a ^bZheng, K. K.; Petrache, C. M.; Zhang, Z. H.; Astier, A.; Lv, B. F.; Greenlees, P. T.; Grahn, T.; Julin, R.; Juutinen, S.; Luoma, M.; Ojala, J.; Pakarinen, J.; Partanen, J.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Sarén, J.; Tann, H.; Uusitalo, J.; Zimba, G.; Cederwall, B.; Aktas, ö.; Ertoprak, A.; Zhang, W.; Guo, S.; Liu, M. L.; Zhou, X. H.; Kuti, I.; Nyakó, B. M.; Sohler, D.; Timár, J.; Andreoiu, C.; Doncel, M.; Joss, D. T.; Page, R. D. (30 July 2021)."Neutron excitations in Ba 119"(PDF).Physical Review C.104 (1) 014326.doi:10.1103/PhysRevC.104.014326.

Isotopes of thechemical elements

Group	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18
Period	Hydrogen and alkali metals	Alkaline earth metals													Pnictogens	Chalcogens	Halogens	Noble gases
①	Isotopes § List H 1																	Isotopes § List He 2
②	Isotopes § List Li 3	Isotopes § List Be 4											Isotopes § List B 5	Isotopes § List C 6	Isotopes § List N 7	Isotopes § List O 8	Isotopes § List F 9	Isotopes § List Ne 10
③	Isotopes § List Na 11	Isotopes § List Mg 12											Isotopes § List Al 13	Isotopes § List Si 14	Isotopes § List P 15	Isotopes § List S 16	Isotopes § List Cl 17	Isotopes § List Ar 18
④	Isotopes § List K 19	Isotopes § List Ca 20	Isotopes § List Sc 21	Isotopes § List Ti 22	Isotopes § List V 23	Isotopes § List Cr 24	Isotopes § List Mn 25	Isotopes § List Fe 26	Isotopes § List Co 27	Isotopes § List Ni 28	Isotopes § List Cu 29	Isotopes § List Zn 30	Isotopes § List Ga 31	Isotopes § List Ge 32	Isotopes § List As 33	Isotopes § List Se 34	Isotopes § List Br 35	Isotopes § List Kr 36
⑤	Isotopes § List Rb 37	Isotopes § List Sr 38	Isotopes § List Y 39	Isotopes § List Zr 40	Isotopes § List Nb 41	Isotopes § List Mo 42	Isotopes § List Tc 43	Isotopes § List Ru 44	Isotopes § List Rh 45	Isotopes § List Pd 46	Isotopes § List Ag 47	Isotopes § List Cd 48	Isotopes § List In 49	Isotopes § List Sn 50	Isotopes § List Sb 51	Isotopes § List Te 52	Isotopes § List I 53	Isotopes § List Xe 54
⑥	Isotopes § List Cs 55	Isotopes § List Ba 56	Isotopes § List Lu 71	Isotopes § List Hf 72	Isotopes § List Ta 73	Isotopes § List W 74	Isotopes § List Re 75	Isotopes § List Os 76	Isotopes § List Ir 77	Isotopes § List Pt 78	Isotopes § List Au 79	Isotopes § List Hg 80	Isotopes § List Tl 81	Isotopes § List Pb 82	Isotopes § List Bi 83	Isotopes § List Po 84	Isotopes § List At 85	Isotopes § List Rn 86
⑦	Isotopes § List Fr 87	Isotopes § List Ra 88	Isotopes § List Lr 103	Isotopes § List Rf 104	Isotopes § List Db 105	Isotopes § List Sg 106	Isotopes § List Bh 107	Isotopes § List Hs 108	Isotopes § List Mt 109	Isotopes § List Ds 110	Isotopes § List Rg 111	Isotopes § List Cn 112	Isotopes § List Nh 113	Isotopes § List Fl 114	Isotopes § List Mc 115	Isotopes § List Lv 116	Isotopes § List Ts 117	Isotopes § List Og 118
⑧	Isotopes § List Uue 119	Isotopes § List Ubn 120

			Isotopes § List La 57	Isotopes § List Ce 58	Isotopes § List Pr 59	Isotopes § List Nd 60	Isotopes § List Pm 61	Isotopes § List Sm 62	Isotopes § List Eu 63	Isotopes § List Gd 64	Isotopes § List Tb 65	Isotopes § List Dy 66	Isotopes § List Ho 67	Isotopes § List Er 68	Isotopes § List Tm 69	Isotopes § List Yb 70
			Isotopes § List Ac 89	Isotopes § List Th 90	Isotopes § List Pa 91	Isotopes § List U 92	Isotopes § List Np 93	Isotopes § List Pu 94	Isotopes § List Am 95	Isotopes § List Cm 96	Isotopes § List Bk 97	Isotopes § List Cf 98	Isotopes § List Es 99	Isotopes § List Fm 100	Isotopes § List Md 101	Isotopes § List No 102