ホルミウム(Ho)の同位体のうち天然に生成するものは、安定同位体165Hoのみである。人工の放射性同位体も知られ、最も安定な163Hoの半減期は4570年である。その他は全て1.17日以内で、そのほとんどは3時間以内である。核異性体166mHoの半減期は1200年である。
標準原子量は164.93032(2) uである。
一覧
| 同位体核種
|
Z(p)
|
N(n)
|
同位体質量 (u)
|
半減期
|
核スピン数
|
天然存在比
|
| 励起エネルギー
|
| 140Ho
|
67
|
73
|
139.96854(54)#
|
6(3) ms
|
8+#
|
|
| 141Ho
|
67
|
74
|
140.96310(54)#
|
4.1(3) ms
|
(7/2-)
|
|
| 141mHo
|
66(2) keV
|
6.4(8) µs
|
(1/2+)
|
|
| 142Ho
|
67
|
75
|
141.95977(54)#
|
400(100) ms
|
(6 to 9)
|
|
| 143Ho
|
67
|
76
|
142.95461(43)#
|
300# ms [>200 ns]
|
11/2-#
|
|
| 144Ho
|
67
|
77
|
143.95148(32)#
|
0.7(1) s
|
|
|
| 145Ho
|
67
|
78
|
144.94720(32)#
|
2.4(1) s
|
(11/2-)
|
|
| 145mHo
|
100(100)# keV
|
100# ms
|
5/2+#
|
|
| 146Ho
|
67
|
79
|
145.94464(21)#
|
3.6(3) s
|
(10+)
|
|
| 147Ho
|
67
|
80
|
146.94006(3)
|
5.8(4) s
|
(11/2-)
|
|
| 148Ho
|
67
|
81
|
147.93772(14)
|
2.2(11) s
|
(1+)
|
|
| 148m1Ho
|
400(100)# keV
|
9.49(12) s
|
(6)-
|
|
| 148m2Ho
|
690(100)# keV
|
2.35(4) ms
|
(10+)
|
|
| 149Ho
|
67
|
82
|
148.933775(20)
|
21.1(2) s
|
(11/2-)
|
|
| 149m1Ho
|
48.80(20) keV
|
56(3) s
|
(1/2+)
|
|
| 149m2Ho
|
7200(350) keV
|
>=100 ns
|
|
|
| 150Ho
|
67
|
83
|
149.933496(15)
|
76.8(18) s
|
2-
|
|
| 150m1Ho
|
-10(50) keV
|
23.3(3) s
|
(9)+
|
|
| 150m2Ho
|
~8000 keV
|
751 ns
|
|
|
| 151Ho
|
67
|
84
|
150.931688(13)
|
35.2(1) s
|
11/2(-)
|
|
| 151mHo
|
41.0(2) keV
|
47.2(10) s
|
1/2(+)
|
|
| 152Ho
|
67
|
85
|
151.931714(15)
|
161.8(3) s
|
2-
|
|
| 152m1Ho
|
160(1) keV
|
50.0(4) s
|
9+
|
|
| 152m2Ho
|
3019.59(19) keV
|
8.4(3) µs
|
19-
|
|
| 153Ho
|
67
|
86
|
152.930199(6)
|
2.01(3) min
|
11/2-
|
|
| 153m1Ho
|
68.7(3) keV
|
9.3(5) min
|
1/2+
|
|
| 153m2Ho
|
2772 keV
|
229(2) ns
|
(31/2+)
|
|
| 154Ho
|
67
|
87
|
153.930602(9)
|
11.76(19) min
|
2-
|
|
| 154mHo
|
238(30) keV
|
3.10(14) min
|
8+
|
|
| 155Ho
|
67
|
88
|
154.929103(19)
|
48(1) min
|
5/2+
|
|
| 155mHo
|
141.97(11) keV
|
880(80) µs
|
11/2-
|
|
| 156Ho
|
67
|
89
|
155.92984(5)
|
56(1) min
|
4-
|
|
| 156m1Ho
|
100(50)# keV
|
7.8(3) min
|
(9+)
|
|
| 156m2Ho
|
52.4(5) keV
|
9.5(15) s
|
1-
|
|
| 157Ho
|
67
|
90
|
156.928256(26)
|
12.6(2) min
|
7/2-
|
|
| 158Ho
|
67
|
91
|
157.928941(29)
|
11.3(4) min
|
5+
|
|
| 158m1Ho
|
67.200(10) keV
|
28(2) min
|
2-
|
|
| 158m2Ho
|
180(70)# keV
|
21.3(23) min
|
(9+)
|
|
| 159Ho
|
67
|
92
|
158.927712(4)
|
33.05(11) min
|
7/2-
|
|
| 159mHo
|
205.91(5) keV
|
8.30(8) s
|
1/2+
|
|
| 160Ho
|
67
|
93
|
159.928729(16)
|
25.6(3) min
|
5+
|
|
| 160m1Ho
|
59.98(3) keV
|
5.02(5) h
|
2-
|
|
| 160m2Ho
|
197(16) keV
|
3 s
|
(9+)
|
|
| 161Ho
|
67
|
94
|
160.927855(3)
|
2.48(5) h
|
7/2-
|
|
| 161mHo
|
211.16(3) keV
|
6.76(7) s
|
1/2+
|
|
| 162Ho
|
67
|
95
|
161.929096(4)
|
15.0(10) min
|
1+
|
|
| 162mHo
|
106(7) keV
|
67.0(7) min
|
6-
|
|
| 163Ho
|
67
|
96
|
162.9287339(27)
|
4570(25) a
|
7/2-
|
|
| 163mHo
|
297.88(7) keV
|
1.09(3) s
|
1/2+
|
|
| 164Ho
|
67
|
97
|
163.9302335(30)
|
29(1) min
|
1+
|
|
| 164mHo
|
139.77(8) keV
|
38.0(10) min [37.5(+15-5) min]
|
6-
|
|
| 165Ho
|
67
|
98
|
164.9303221(27)
|
STABLE
|
7/2-
|
1.0000
|
| 166Ho
|
67
|
99
|
165.9322842(27)
|
26.83(2) h
|
0-
|
|
| 166m1Ho
|
5.985(18) keV
|
1.20(18)E+3 a
|
(7)-
|
|
| 166m2Ho
|
190.9052(20) keV
|
185(15) µs
|
3+
|
|
| 167Ho
|
67
|
100
|
166.933133(6)
|
3.003(18) h
|
7/2-
|
|
| 167mHo
|
259.34(11) keV
|
6.0(10) µs
|
3/2+
|
|
| 168Ho
|
67
|
101
|
167.93552(3)
|
2.99(7) min
|
3+
|
|
| 168m1Ho
|
59(1) keV
|
132(4) s
|
(6+)
|
|
| 168m2Ho
|
143.4(2) keV
|
>4 µs
|
(1)-
|
|
| 168m3Ho
|
192.6(2) keV
|
108(11) ns
|
1+
|
|
| 169Ho
|
67
|
102
|
168.936872(22)
|
4.72(10) min
|
7/2-
|
|
| 170Ho
|
67
|
103
|
169.93962(5)
|
2.76(5) min
|
6+#
|
|
| 170mHo
|
120(70) keV
|
43(2) s
|
(1+)
|
|
| 171Ho
|
67
|
104
|
170.94147(64)
|
53(2) s
|
7/2-#
|
|
| 172Ho
|
67
|
105
|
171.94482(43)#
|
25(3) s
|
|
|
| 173Ho
|
67
|
106
|
172.94729(43)#
|
10# s
|
7/2-#
|
|
| 174Ho
|
67
|
107
|
173.95115(54)#
|
8# s
|
|
|
| 175Ho
|
67
|
108
|
174.95405(64)#
|
5# s
|
7/2-#
|
|
参考文献
- 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.
