Table of Isotopes decay data

WWW Table of Radioactive Isotopes

157	Eu
63	Eu	94

Half life:

15.18 h 3

Jp:

5/2+

S_n (keV):

7449 8

S_p (keV):

7388 11

Prod. mode:

Fission product
Fast neutron activation

ENSDF citation:

NDS 78,219 (1996)

Literature cut-off date:

1-Mar-1996

Author(s):

R.G. Helmer

References since cut-off:

¹⁵⁷Eu decay from 1996-98 (NSR)


Decay properties:
Mode	Branching (%)	Q-value (keV)	References
b^-	100	1363 6	86GrZS

Most Recent ENSDF Data (12/2002)
Mode	Data set name	Display data
b^-	157EU B- DECAY
	Tables:
	ENSDF data:
	Java applets:

TORI Data (1999) Gammas from ¹⁵⁷Eu (15.18 h 3)
Eg (keV)	Ig (%)	Decay mode

9.365 12	1.64 24	b^-
14.7		b^-
39.7		b^-
51.834 14	0.75 8	b^-
54.548 9	3.7 3	b^-
63.929 8	23.0 23	b^-
64.4 2	0.13 7	b^-
66.5		b^-
76.925 14	0.20 3	b^-
95.8 1	0.011 6	b^-
116.314 28	0.040 10	b^-
129.5 2	0.012 7	b^-
131.438 16	0.056 14	b^-
133.3		b^-
152.8		b^-
158.41 3	0.024 7	b^-
160.0		b^-
161.820 13	0.085 17	b^-
163.7 2	0.008 4	b^-
181.8		b^-
188.6		b^-
208.621 11	0.147 14	b^-
209.0 2	0.017 9	b^-
212.050 25	0.061 9	b^-
223.8		b^-
226.63 3	0.037 8	b^-
237.9 2	0.015 8	b^-
246.5 2	0.008 4	b^-
252.3 2	0.044 22	b^-
276.86 5	0.041 8	b^-
288.023 19	0.096 14	b^-
291.69 7	0.022 6	b^-
302.994 28	0.067 10	b^-
317.1		b^-
318.710 8	2.89 14	b^-
328.3 2	0.022 11	b^-
334.441 10	0.83 6	b^-
339.3 2	0.017 9	b^-
342.0		b^-
344.61 6	0.035 7	b^-
358.931 15	0.30 3	b^-
370.509 8	11.0 6	b^-
379.905 9	0.26 3	b^-
383.17 3	0.070 11	b^-
385.5		b^-
393.408 20	0.122 12	b^-
398.953 9	1.32 7	b^-
409.135 10	2.67 13	b^-
410.723 9	17.5 9	b^-
420.090 9	0.92 7	b^-
427.355 15	0.160 15	b^-
434.388 13	0.35 3	b^-
449.4		b^-
450.761 10	1.22 9	b^-
454.3		b^-
460.923 9	0.97 7	b^-
470.389 26	0.198 20	b^-
474.625 11	2.52 12	b^-
479.2		b^-
491.89 3	0.090 13	b^-
498.9		b^-
506.43 3	0.081 12	b^-
524.835 18	0.30 3	b^-
543.93 6	0.033 7	b^-
553.02 7	0.035 7	b^-
555.23 12	0.034 7	b^-
560.3		b^-
567.58 4	0.145 14	b^-
570.937 13	1.56 8	b^-
575.8		b^-
585.46 20	0.018 6	b^-
591.097 19	0.157 15	b^-
607.1 2	0.046 23	b^-
613.73 14	0.017 6	b^-
619.303 12	3.55 18	b^-
622.751 13	0.97 7	b^-
625.6 2	0.014 4	b^-
628.704 28	0.099 15	b^-
630.4		b^-
632.23 5	0.046 9	b^-
635.75 9	0.046 9	b^-
655.592 28	0.185 19	b^-
657.1		b^-
668.5 2	0.012 3	b^-
674.59 18	0.017 6	b^-
682.60 6	0.077 22	b^-
683.162 27	0.23 4	b^-
685.2 2	0.047 24	b^-
687.502 13	1.18 12	b^-
696.94 4	0.071 8	b^-
698.62 5	0.063 7	b^-
700.856 16	0.29 3	b^-
702.4		b^-
707.46 9	0.046 7	b^-
716.92 10	0.028 7	b^-
728.5 4	0.022 6	b^-
732.5		b^-
739.34 12	0.018 6	b^-
747.8		b^-
750.8 6	0.129 13	b^-
752.61 4	0.254 25	b^-
754.8 3	0.024 8	b^-
760.5		b^-
762.69 3	0.36 6	b^-
762.7 6	~0.033	b^-
803.65 16	0.018 6	b^-
811.6		b^-
814.17 12	0.022 7	b^-
816.64 4	0.070 11	b^-
836.23 14	0.013 4	b^-
846.78 15	0.033 11	b^-
865.05 20	0.020 6	b^-
932.6 4	0.020 6	b^-
934.24 8	0.039 10	b^-
944.21 10	0.032 10	b^-
969.19 9	0.011 4	b^-
985.69 4	0.143 14	b^-
996.38 12	0.030 9	b^-
1017.6		b^-
1051.57 15	0.025 8	b^-
1060.06 10	0.028 9	b^-
1115.53 15	0.019 6	b^-
1167.38 12	0.046 11	b^-

X-rays from ¹⁵⁷Eu (15.18 h 3)
E (keV)	I (%)	Assignment

5.362	0.31 4	Gd L_l
6.026	0.81 9	Gd L_a2
6.050	0.112 13	Gd L_h
6.058	7.3 8	Gd L_a1
6.687	0.36 6	Gd L_b4
6.713	4.8 5	Gd L_b1
6.832	0.60 10	Gd L_b3
6.867	0.072 8	Gd L_b6
7.102	1.53 17	Gd L_b2
7.243	0.0125 13	Gd L_b5
7.790	0.81 9	Gd L_g1
7.930	0.0067 9	Gd L_g6
8.087	0.115 20	Gd L_g2
8.105	0.16 3	Gd L_g3
41.864	0.0054 4	Gd K_a3
42.309	17.6 11	Gd K_a2
42.996	31.7 20	Gd K_a1
48.551	3.15 20	Gd K_b3
48.695	6.1 4	Gd K_b1
49.038	0.096 7	Gd K_b5
49.959	2.04 13	Gd K_b2
50.099	0.79 6	Gd K_b4

Betas from ¹⁵⁷Eu (15.18 h 3)
Eb endpoint (keV)	Ib (%)	Decay mode

611.57	2	b^-
676.33	3	b^-
679.77	4	b^-
838.15	4	b^-
848.33	3	b^-
888.37	22 1	b^-
928.57	15 1	b^-
1299.08	48 9	b^-

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