155 Er
68 87
Half life: 5.3 m 3
Jp: 7/2-
Decay mode: e+b+, a
Sn (keV): 7674 50
Sp (keV): 4860 51
Literature cut-off date: 1-Mar-1994
Author(s): C.W. Reich
ENSDF citation: NDS 71,709 (1994)

Decay properties

Mode Branching (%) Q-value (keV)
e+b+ 99.978 7 3843 55
a 0.022 7 4119 50

Gammas from 155Er (5.3 m 3)

Eg (keV) Ig (%) Decay mode
31.7 1 0.17 5* e+b+
88.2 1 23.5 8* e+b+
91.6 3 3.7 5* e+b+
110.12 7 100* e+b+
123.8 1 27 1* e+b+
131.2 3 2.6 7* e+b+
147.6 3 2.8 7* e+b+
157.0 3 3.0 7* e+b+
164.7 3 2.9 7* e+b+
185.1 1 19.5 7* e+b+
188.1 2 5.0 6* e+b+
193.6 1 10.7 6* e+b+
201.1 1 26.0 10* e+b+
221.1 2 21 5* e+b+
229.2 3 15 4* e+b+
234.0 1 40.0 18* e+b+
234.8 2 19.2 18* e+b+
241.5 2 65 7* e+b+
264.4 4 2.5 8* e+b+
278.3 5 1.9 9* e+b+
283.6 4 1.9 7* e+b+
288.2 2 5.8 7* e+b+
295.6 5 1.9 7* e+b+
298.8 2 7.6 9* e+b+
308.2 3 3.2 7* e+b+
322.9 3 3.9 9* e+b+
328.7 2 12.7 15* e+b+
333.8 2 6.8 13* e+b+
339.6 3 5.3 14* e+b+
344.9 3 4.6 16* e+b+
352.0 5 2.2 10* e+b+
358.6 3 14.6 17* e+b+
360.9 6 3* e+b+
373.3 5 2.7 11* e+b+
385.9 3 4.4 10* e+b+
388.9 2 8.7 10* e+b+
397.0 3 5.0 11* e+b+
399.7 5 3.4 11* e+b+
404.8 7 1.8 10* e+b+
412.1 3 4.8 9* e+b+
422.7 1 20.2 13* e+b+
450.1 4 6.1 18* e+b+
452.6 2 24.1 20* e+b+
455.9 3 7.4 13* e+b+
470.6 2 12.8 14* e+b+
475.5 3 5.6 13* e+b+
511.0 2 15 7* e+b+
512.2 2 37 7* e+b+
557.1 9 5* e+b+

Alphas from 155Er (5.3 m 3)

Ea (keV) Ia (%)
4012 5 100