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Half life: | 39.3 h 2 | |
E(level): | 78 2 keV |
Jp: | 2+ |
Sn (keV): | 5092 5 |
Sp (keV): | 4598 7 |
Prod. mode: |
Thermal neutron activation
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| |
ENSDF citation: | NDS 57,590 (1989) |
Literature cut-off date: | 1-Dec-1988 |
Author(s): | M.R. Schmorak |
Update: | Unknown, J. Tuli |
References since cut-off: |
254Es decay from 1998-98 (NSR)
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|
Decay properties: |
Mode | Branching (%) | Q-value (keV) |
References |
b- | 98 2 | 1088 3 |
71Po20 73Ah04 75FrZZ |
a | 0.33 1 | 6615.7 15 |
66Mc02 |
IT | <3 | |
|
e | 0.078 6 | 652 13 |
|
SF | <0.045 | |
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Data sets: |
Mode | Data set name | Display data |
|
Gammas from 254mEs (39.3 h 2)
|
Eg (keV) |
Ig (%) | Decay mode |
|
1.11 70 |
|
a |
34.4 1 |
|
a |
35.5 1 |
|
a |
36.4 |
|
a |
39.881 10 |
|
b- |
42.6 1 |
|
a |
44.988 10 |
0.048 5 |
b- |
50.07 5 |
0.0092 10 |
a |
71.30 5 |
0.043 4 |
a |
79.90 8 |
0.0036 4 |
a |
90.7 4 |
0.00066 20 |
a |
96.3 1 |
0.0056 6 |
a |
104.0 2 |
0.0102 10 |
a |
104.360 12 |
0.176 17 |
b- |
126.0 8 |
0.00049 20 |
a |
175.7 3 |
0.0028 6 |
a |
177.30 10 |
0.056 6 |
a |
211.80 10 |
0.096 10 |
a |
544.44 2 |
0.88 8 |
b- |
584.32 2 |
2.84 20 |
b- |
648.80 2 |
28.4 20 |
b- |
688.68 2 |
12.3 9 |
b- |
693.79 2 |
24.3 17 |
b- |
|
X-rays from 254mEs (39.3 h 2)
|
E (keV) |
I (%) | Assignment |
|
12.890 |
0.0053 19 |
Bk Ll |
13.660 |
0.74 12 |
Fm Ll |
15.082 |
0.008 3 |
Bk La2 |
15.308 |
0.070 24 |
Bk La1 |
16.116 |
1.05 14 |
Fm La2 |
16.377 |
9.4 13 |
Fm La1 |
17.687 |
0.0014 5 |
Bk Lb6 |
17.826 |
0.0008 4 |
Bk Lh |
18.508 |
0.019 7 |
Bk Lb2 |
18.916 |
0.20 3 |
Fm Lb6 |
19.118 |
0.019 5 |
Bk Lb4 |
19.311 |
0.0045 16 |
Bk Lb5 |
19.433 |
0.27 4 |
Fm Lh |
19.834 |
2.6 4 |
Fm Lb2 |
20.018 |
0.029 15 |
Bk Lb1 |
20.280 |
0.015 4 |
Bk Lb3 |
20.727 |
0.63 8 |
Fm Lb5 |
20.798 |
0.15 3 |
Fm Lb4 |
21.889 |
9.5 13 |
Fm Lb1 |
22.169 |
0.106 22 |
Fm Lb3 |
23.416 |
0.007 4 |
Bk Lg1 |
23.698 |
0.0089 24 |
Bk Lg2 |
24.007 |
0.0071 20 |
Bk Lg3 |
24.241 |
0.0015 8 |
Bk Lg6 |
25.574 |
2.5 3 |
Fm Lg1 |
25.825 |
0.068 15 |
Fm Lg2 |
26.195 |
0.050 11 |
Fm Lg3 |
26.492 |
0.53 8 |
Fm Lg6 |
106.300 |
1.98E-05 15 |
Bk Ka3 |
107.185 |
0.0039 3 |
Bk Ka2 |
112.121 |
0.0062 5 |
Bk Ka1 |
114.352 |
0.00318 16 |
Fm Ka3 |
115.285 |
0.504 22 |
Fm Ka2 |
121.058 |
0.78 3 |
Fm Ka1 |
125.418 |
0.00077 6 |
Bk Kb3 |
126.580 |
0.00146 11 |
Bk Kb1 |
127.316 |
6.0E-05 5 |
Bk Kb5 |
130.152 |
0.00058 4 |
Bk Kb2 |
130.630 |
2.27E-04 18 |
Bk Kb4 |
135.150 |
0.099 4 |
Fm Kb3 |
136.521 |
0.186 8 |
Fm Kb1 |
137.304 |
0.0079 4 |
Fm Kb5 |
140.362 |
0.075 3 |
Fm Kb2 |
140.893 |
0.0303 17 |
Fm Kb4 |
Betas from 254mEs (39.3 h 2)
|
Eb endpoint (keV) |
Ib (%) | Decay mode |
|
432,33 |
16 10 |
b- |
472,21 |
55 10 |
b- |
1121,01 |
10 |
b- |
1166 |
18 |
b- |
Alphas from 254mEs (39.3 h 2)
|
Ea (keV) |
Ia (%) |
|
6280 3 |
0.16 3 |
6297 2 |
0.48 6 |
6325 2 |
2.2 2 |
6357 2 |
8.3 5 |
6382 2 |
75.0 10 |
6415 2 |
1.8 2 |
6455 3 |
0.12 4 |
6463 2 |
0.62 7 |
6469 4 |
~0.08 |
6513 2 |
1.4 14 |
6557 2 |
5.8 4 |
6591 4 |
4.0 5 |
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