Isotopes of zirconium (₄₀Zr)

Main isotopes[1] Decay abun­dance half-life (t1/2) mode pro­duct 88Zr synth 83.4 d ε 88Y γ – 89Zr synth 78.4 h ε 89Y β+ 89Y γ – 90Zr 51.5% stable 91Zr 11.2% stable 92Zr 17.1% stable 93Zr trace 1.53×106 y β− 93Nb 94Zr 17.4% stable 96Zr 2.80% 2.0×1019 y[2] β−β− 96Mo
Standard atomic weight Ar°(Zr)
	91.224±0.002[3] 91.224±0.002 (abridged)[4]
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Naturally occurring zirconium (₄₀Zr) is composed of four stable isotopes (of which one may in the future be found radioactive), and one very long-lived radioisotope (⁹⁶Zr), a primordial nuclide that decays via double beta decay with an observed half-life of 2.0×10¹⁹ years;^[5] it can also undergo single beta decay, which is not yet observed, but the theoretically predicted value of t_1/2 is 2.4×10²⁰ years.^[6] The second most stable radioisotope is ⁹³Zr, which has a half-life of 1.53 million years. Thirty other radioisotopes have been observed. All have half-lives less than a day except for ⁹⁵Zr (64.02 days), ⁸⁸Zr (83.4 days), and ⁸⁹Zr (78.41 hours). The primary decay mode is electron capture for isotopes lighter than ⁹²Zr, and the primary mode for heavier isotopes is beta decay.

List of isotopes

Zdroj:https://en.wikipedia.org?pojem=Zirconium-93
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Nuclide [n 1]	Z	N	Isotopic mass (Da) [n 2][n 3]	Half-life [n 4][n 5]	Decay mode	Daughter isotope [n 6]	Spin and parity [n 7][n 5]	Natural abundance (mole fraction)
	Excitation energy							Normal proportion	Range of variation
78Zr	40	38	77.95523(54)#	50# ms			0+
79Zr	40	39	78.94916(43)#	56(30) ms	β+, p	78Sr	5/2+#
					β+	79Y
80Zr	40	40	79.9404(16)	4.6(6) s	β+	80Y	0+
81Zr	40	41	80.93721(18)	5.5(4) s	β+ (>99.9%)	81Y	(3/2−)#
					β+, p (<.1%)	80Sr
82Zr	40	42	81.93109(24)#	32(5) s	β+	82Y	0+
83Zr	40	43	82.92865(10)	41.6(24) s	β+ (>99.9%)	83Y	(1/2−)#
					β+, p (<.1%)	82Sr
84Zr	40	44	83.92325(21)#	25.9(7) min	β+	84Y	0+
85Zr	40	45	84.92147(11)	7.86(4) min	β+	85Y	7/2+
85mZr	292.2(3) keV			10.9(3) s	IT (92%)	85Zr	(1/2−)
					β+ (8%)	85Y
86Zr	40	46	85.91647(3)	16.5(1) h	β+	86Y	0+
87Zr	40	47	86.914816(9)	1.68(1) h	β+	87Y	(9/2)+
87mZr	335.84(19) keV			14.0(2) s	IT	87Zr	(1/2)−
88Zr[n 8]	40	48	87.910227(11)	83.4(3) d	EC	88Y	0+
89Zr	40	49	88.908890(4)	78.41(12) h	β+	89Y	9/2+
89mZr	587.82(10) keV			4.161(17) min	IT (93.77%)	89Zr	1/2−
					β+ (6.23%)	89Y
90Zr[n 9]	40	50	89.9047044(25)	Stable			0+	0.5145(40)
90m1Zr	2319.000(10) keV			809.2(20) ms	IT	90Zr	5-
90m2Zr	3589.419(16) keV			131(4) ns			8+
91Zr[n 9]	40	51	90.9056458(25)	Stable			5/2+	0.1122(5)
91mZr	3167.3(4) keV			4.35(14) μs			(21/2+)
92Zr[n 9]	40	52	91.9050408(25)	Stable			0+	0.1715(8)
93Zr[n 10]	40	53	92.9064760(25)	1.53(10)×106 y	β− (73%)	93mNb	5/2+
					β− (27%)	93Nb
94Zr[n 9]	40	54	93.9063152(26)	Observationally stable[n 11]			0+	0.1738(28)
95Zr[n 9]	40	55	94.9080426(26)	64.032(6) d	β−	95Nb	5/2+
96Zr[n 12][n 9][n 13]	40	56	95.9082734(30)	2.0(4)×1019 y	β−β−[n 14]	96Mo	0+	0.0280(9)
97Zr	40	57	96.9109531(30)	16.744(11) h	β−	97mNb	1/2+
98Zr	40	58	97.912735(21)	30.7(4) s	β−	98Nb	0+
99Zr	40	59	98.916512(22)	2.1(1) s	β−	99mNb	1/2+
100Zr	40	60	99.91776(4)	7.1(4) s	β−	100Nb	0+
101Zr	40	61	100.92114(3)	2.3(1) s	β−	101Nb	3/2+
102Zr	40	62	101.92298(5)	2.9(2) s	β−	102Nb	0+
103Zr	40	63	102.92660(12)	1.3(1) s	β−	103Nb	(5/2−)
104Zr	40	64	103.92878(43)#	1.2(3) s	β−	104Nb	0+
105Zr	40	65	104.93305(43)#	0.6(1) s	β− (>99.9%)	105Nb