鋇的同位素

**主要的鋇同位素**
標準原子質量 (Ar, 標準)	137.327(7)[1];
←Cs（55）	La（57）→

鋇(原子量：137.327(7)）的同位素，其中有5個同位素是穩定的。

圖表

符號	Z（p ）	N（n ）	同位素質量（u）	半衰期	衰變方式[2][n 1]	衰變產物[n 2]	原子核自旋	相對豐度（莫耳分率）	相對豐度的變化量（莫耳分率）
符號	激發能量			半衰期	衰變方式[2][n 1]	衰變產物[n 2]	原子核自旋	相對豐度（莫耳分率）	相對豐度的變化量（莫耳分率）
¹¹⁴Ba	56	58	113.95068(15)	530(230) ms [0.43(+30−15) s]	β⁺, p (99.59%)	¹¹³Xe	0+
					α (.37%)	¹¹⁰Xe
					β⁺ (.04%)	¹¹⁴Cs
					CD (<.0034%)[n 3]	¹⁰²Sn, 12 C
¹¹⁵Ba	56	59	114.94737(64)#	0.45(5) s	β⁺	¹¹⁵Cs	(5/2+)#
¹¹⁵Ba	56	59	114.94737(64)#	0.45(5) s	β⁺, p	¹¹⁴Xe	(5/2+)#
¹¹⁶Ba	56	60	115.94138(43)#	1.3(2) s	β⁺	¹¹⁶Cs	0+
¹¹⁶Ba	56	60	115.94138(43)#	1.3(2) s	β⁺, p	¹¹⁵Xe	0+
¹¹⁷Ba	56	61	116.93850(32)#	1.75(7) s	β⁺	¹¹⁷Cs	(3/2)(+#)
					β⁺, α	¹¹³I
					β⁺, p	¹¹⁶Xe
¹¹⁸Ba	56	62	117.93304(21)#	5.2(2) s	β⁺	¹¹⁸Cs	0+
¹¹⁸Ba	56	62	117.93304(21)#	5.2(2) s	β⁺, p	¹¹⁷Xe	0+
¹¹⁹Ba	56	63	118.93066(21)	5.4(3) s	β⁺	¹¹⁹Cs	(5/2+)
¹¹⁹Ba	56	63	118.93066(21)	5.4(3) s	β⁺, p	¹¹⁸Xe	(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 (.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(+)
¹²⁴Ba	56	68	123.915094(13)	11.0(5) min	β⁺	¹²⁴Cs	0+
¹²⁵Ba	56	69	124.914473(12)	3.5(4) min	β⁺	¹²⁵Cs	1/2(+#)
¹²⁶Ba	56	70	125.911250(13)	100(2) min	β⁺	¹²⁶Cs	0+
¹²⁷Ba	56	71	126.911094(12)	12.7(4) min	β⁺	¹²⁷Cs	1/2+
^127mBa	80.33(12) keV			1.9(2) s	IT	¹²⁷Ba	7/2−
¹²⁸Ba	56	72	127.908318(11)	2.43(5) d	β⁺	¹²⁸Cs	0+
¹²⁹Ba	56	73	128.908679(12)	2.23(11) h	β⁺	¹²⁹Cs	1/2+
^129mBa	8.42(6) keV			2.16(2) h	β⁺	¹²⁹Cs	7/2+#
^129mBa	8.42(6) keV			2.16(2) h	IT	¹²⁹Ba	7/2+#
¹³⁰Ba[n 4]	56	74	129.9063208(30)	1.6(±1.1)×10²¹ yrs	DEC	¹³⁰Xe	0+	0.00106(1)
^130mBa	2475.12(18) keV			9.54(14) ms	IT	¹³⁰Ba	8−
¹³¹Ba	56	75	130.906941(3)	11.50(6) d	β⁺	¹³¹Cs	1/2+
^131mBa	187.14(12) keV			14.6(2) min	IT	¹³¹Ba	9/2−
¹³²Ba	56	76	131.9050613(11)	觀測上穩定[n 5]			0+	0.00101(1)
¹³³Ba	56	77	132.9060075(11)	10.51(5) yrs	ε	¹³³Cs	1/2+
^133mBa	288.247(9) keV			38.9(1) h	IT (99.99%)	¹³³Ba	11/2−
^133mBa	288.247(9) keV			38.9(1) h	ε (.0096%)	¹³³Cs	11/2−
¹³⁴Ba	56	78	133.9045084(4)	稳定[n 6]			0+	0.02417(18)
¹³⁵Ba	56	79	134.9056886(4)	稳定[n 6]			3/2+	0.06592(12)
^135mBa	268.22(2) keV			28.7(2) h	IT	¹³⁵Ba	11/2−
¹³⁶Ba	56	80	135.9045759(4)	稳定[n 6]			0+	0.07854(24)
^136mBa	2030.466(18) keV			308.4(19) ms	IT	¹³⁶Ba	7−
¹³⁷Ba	56	81	136.9058274(5)	稳定[n 6]			3/2+	0.11232(24)
^137m1Ba	661.659(3) keV			2.552(1) min	IT	¹³⁷Ba	11/2−
^137m2Ba	2349.1(4) keV			0.59(10) µs			(17/2−)
¹³⁸Ba[n 7]	56	82	137.9052472(5)	稳定[n 6]			0+	0.71698(42)
^138mBa	2090.54(6) keV			800(100) ns			6+
¹³⁹Ba[n 7]	56	83	138.9088413(5)	83.06(28) min	β⁻	¹³⁹La	7/2−
¹⁴⁰Ba[n 7]	56	84	139.910605(9)	12.752(3) d	β⁻	¹⁴⁰La	0+
¹⁴¹Ba[n 7]	56	85	140.914411(9)	18.27(7) min	β⁻	¹⁴¹La	3/2−
¹⁴²Ba[n 7]	56	86	141.916453(7)	10.6(2) min	β⁻	¹⁴²La	0+
¹⁴³Ba[n 7]	56	87	142.920627(14)	14.5(3) s	β⁻	¹⁴³La	5/2−
¹⁴⁴Ba[n 7]	56	88	143.922953(14)	11.5(2) s	β⁻	¹⁴⁴La	0+
¹⁴⁵Ba	56	89	144.92763(8)	4.31(16) s	β⁻	¹⁴⁵La	5/2−
¹⁴⁶Ba	56	90	145.93022(8)	2.22(7) s	β⁻ (99.98%)	¹⁴⁶La	0+
¹⁴⁶Ba	56	90	145.93022(8)	2.22(7) s	β⁻, n (.02%)	¹⁴⁵La	0+
¹⁴⁷Ba	56	91	146.93495(22)#	0.893(1) s	β⁻ (99.94%)	¹⁴⁷La	(3/2+)
¹⁴⁷Ba	56	91	146.93495(22)#	0.893(1) s	β⁻, n (.06%)	¹⁴⁶La	(3/2+)
¹⁴⁸Ba	56	92	147.93772(9)	0.612(17) s	β⁻ (99.6%)	¹⁴⁸La	0+
¹⁴⁸Ba	56	92	147.93772(9)	0.612(17) s	β⁻, n (.4%)	¹⁴⁷La	0+
¹⁴⁹Ba	56	93	148.94258(21)#	344(7) ms	β⁻ (99.57%)	¹⁴⁹La	3/2−#
¹⁴⁹Ba	56	93	148.94258(21)#	344(7) ms	β⁻, n (.43%)	¹⁴⁸La	3/2−#
¹⁵⁰Ba	56	94	149.94568(43)#	300 ms	β⁻	¹⁵⁰La	0+
¹⁵⁰Ba	56	94	149.94568(43)#	300 ms	β⁻, n （不常見）	¹⁴⁹La	0+
¹⁵¹Ba	56	95	150.95081(43)#	200# ms [>300 ns]	β⁻	¹⁵¹La	3/2−#
¹⁵²Ba	56	96	151.95427(54)#	100# ms	β⁻	¹⁵²La	0+
¹⁵³Ba	56	97	152.95961(86)#	80# ms	β⁻	¹⁵³La	5/2−#

備註：畫上#號的數據代表沒有經過實驗的証明，只是理論推測而已，而用括號括起來的代表數據不確定性。

←	同位素列表	→
銫的同位素	鋇的同位素	鑭的同位素

註釋

縮寫的涵義：
ε：电子俘获
 IT：核異構轉變
 β⁺：正电子发射
 β⁻：貝他衰變
穩定的衰變產物以粗體表示。
Cluster decay is predicted but had never been observed.
Primordial radioisotope
Believed to undergo β⁺β⁺ decay to ¹³²Xe with a half-life over 300×10¹⁸ years
Theoretically capable of spontaneous fission
Fission product

参考文獻

Meija, Juris; 等. . Pure and Applied Chemistry. 2016, 88 (3): 265–91. doi:10.1515/pac-2015-0305.
. nucleonica. .

Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005).
Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

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[3] 縮寫的涵義：
ε：电子俘获
IT：核異構轉變
β⁺：正电子发射
β⁻：貝他衰變

[4] 穩定的衰變產物以粗體表示。

[5] Cluster decay is predicted but had never been observed.

[6] Primordial radioisotope

[7] Believed to undergo β⁺β⁺ decay to ¹³²Xe with a half-life over 300×10¹⁸ years

[SF-8] Theoretically capable of spontaneous fission

[FP-9] Fission product

[CIAAW2013-1] Meija, Juris; 等. . Pure and Applied Chemistry. 2016, 88 (3): 265–91. doi:10.1515/pac-2015-0305.

[iso_data-2] . nucleonica. .