142m Eu
63 79
Half life: 1.22 m 2
Jp: 8-
Decay mode: e+b+
Ex(keV): 0+x
Sn (keV): 9455 42
Sp (keV): 2695 33
Prod. mode: Charged particle reaction
Literature cut-off date: 31-Jul-1989
Author(s): L.K. Peker
Update: 20-Sep-1996, B. Singh
ENSDF citation: NDS 63,647 (1991)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 100 7645 29

Gammas from 142mEu (1.22 m 2)

Eg (keV) Ig (%) Decay mode
24.1 3 e+b+
200.9 5 1.1 2 e+b+
273.8 5 1.2 2 e+b+
474.4 5 0.75 10 e+b+
540.0 2 5.0 4 e+b+
556.6 2 86.6 30 e+b+
563.7 2 8.3 4 e+b+
580.7 4 0.44 10 e+b+
628.7 2 4.1 2 e+b+
741.2 2 1.7 2 e+b+
768.1 1 100 e+b+
832.6 2 0.42 9 e+b+
848.0 3 0.40 8 e+b+
886.7 2 0.69 7 e+b+
906.4 3 0.50 12 e+b+
954.3 2 0.58 8 e+b+
982.0 5 0.24 5 e+b+
1016.1 2 11.0 6 e+b+
1023.3 2 92.0 30 e+b+
1151.0 3 0.35 7 e+b+
1198.8 3 0.39 10 e+b+
1212.0 3 0.47 10 e+b+
1341.9 2 2.98 14 e+b+
1426.8 3 0.78 15 e+b+
1652.1 3 0.29 6 e+b+
1700.1 3 0.83 7 e+b+
1724.5 4 0.12 4 e+b+
1728.5 3 0.20 5 e+b+
1838.6 3 0.44 5 e+b+
1889.0 4 0.15 3 e+b+
1937.6 3 0.51 6 e+b+
2258.4 2 0.64 6 e+b+

X-rays from 142mEu (1.22 m 2)

E (keV) I (%) Assignment
4,993 0.25 3 Sm Ll
5,589 0.107 8 Sm Lh
5,610 0.66 4 Sm La2
5,636 5.9 4 Sm La1
6,196 0.056 9 Sm Lb4
6,206 4.4 3 Sm Lb1
6,317 0.094 14 Sm Lb3
6,371 0.055 4 Sm Lb6
6,587 1.25 9 Sm Lb2
7,183 0.72 6 Sm Lg1
7,471 0.017 3 Sm Lg2
7,489 0.025 4 Sm Lg3
39,097 0.00100 4 Sm Ka3
39,522 3.94 12 Sm Ka2
40,118 7.13 22 Sm Ka1
45,294 0.697 21 Sm Kb3
45,414 1.35 4 Sm Kb1
45,741 0.0200 9 Sm Kb5
46,578 0.445 14 Sm Kb2
46,705 0.169 8 Sm Kb4

Betas from 142mEu (1.22 m 2)

>Eb endpoint (keV) Ib (%) Decay mode
1987,7 0.31 b+
2308,9 0.5 b+
2407,6 0.26 b+
2545,9 0.8 b+
2819,4 1.0 b+
2904,3 2.1 b+
3009,7 0.33 e
3047,2 0.5 b+
3231,4 1.5 b+
3291,9 0.6 b+
3330,9 0.39 e
3398,2 0.31 b+
3429,6 0.18 e
3505,1 1.3 b+
3567,9 0.46 e
3706,2 2.1 b+
3841,4 0.46 e
3926,3 0.9 e
4069,2 0.2 e
4246,2 70 b+
4253,4 0.48 e
4313,9 0.2 e
4420,2 0.09 e
4527,1 0.34 e
4728,2 0.49 e
5268,2 11 e