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 [編集]
| 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 |
天然存在比
(範囲) |
| 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 [編集]
- 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.
