List of levels for 154ER

Author: C. W. Reich | Citation: Nucl. Data Sheets 110, 2257 (2009) | Cutoff date: 1-May-2008

Data for excited levels are primarily from the (HI,xnγ) studies.

Levels: Lifetimes for 9 levels above 3500 keV have been measured by 1981Wa04 and 1979Ag01. Since these values are very different and may depend on ordering of the γ rays, and the ordering adopted here is different, the half-lives have not been adopted.

Gammas: The unplaced γ’s are not given here, see (HI,xnγ) data and ¹⁵⁴Tm ε decay (3.3 s).

E(level): Since the various decay modes are generally independent, the level energies are taken from the individual data sets.

E(level): The uncertainties for the level energies in the two super-deformed bands are relative to the lowest level in each band.

J^π(level): The J^π values are those proposed by the authors of the heavy-ion-induced reaction studies and are based on the γ multipolarities and the expected band structures. Thus, specific J^π arguments are not given for each of the levels.

M(γ): From the heavy-ion-induced reaction studies.

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
560.8	2+		560.8 1	E2	0.01231	α=0.01231
1162.2	4+		601.4 1	E2	0.01038	α=0.01038
1787.6	6+		625.4 1	E2	0.00946	α=0.00946
2329.5	8+		541.9 2	E2	0.01341	α=0.01341
2583.6	8+		796.0 2	E2	0.00545	α=0.00545
3655	12+		638.5	E2	0.00900	α=0.00900
3830	13-		805.0	E2	0.00532	B(E2)(W.u.)=0.62 19, α=0.00532
4274	14+		619.5	E2	0.00967	α=0.00967
4499	15-		668.8	E2	0.00808	B(E2)(W.u.)=2.0 7, α=0.00808
4678	16+		403.5	E2	0.0292	α=0.0292
5006	17-		506.9	E2	0.01587	B(E2)(W.u.)=14 6, α=0.01587
5328	18+		650.8	E2	0.00861	α=0.00861
5462	19-		455.6	E2	0.0210	B(E2)(W.u.)=1.74 15, α=0.0210
6063	20+		735	E2	0.00651	α=0.00651
6289	21-		202.2	M1+E2	0.32	α=0.32 8
6289	21-		827.5	E2	0.00501	B(E2)(W.u.)=1.109, α=0.00501
6575	(21-)		1113.7	E2	0.00270	α=0.00270
7015	23-		441.0	E2	0.0229	B(E2)(W.u.)=0.125 14, α=0.0229
7015	23-		726.7	E2	0.00668	B(E2)(W.u.)=0.206 23, α=0.00668
7334	25-		318.3	E2	0.0578	B(E2)(W.u.)=79 19, α=0.0578
8009	(26)-		675.5	M1+E2	0.012	α=0.012 5
8106	27-		772.6	E2	0.00582	B(E2)(W.u.)=0.09 3, α=0.00582
8669	(28)+		562.9	E1	0.00431	α=0.00431
9475	29-		1368.8	E2	0.00183	α=0.00183
9589	(30)+		294.5	M1+E2	0.11	α=0.11 4
9589	(30)+		919.7	E2	0.00400	α=0.00400
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
10108	31-		632.8	E2	0.00920	α=0.00920
10150	(32)+		307.1	E2	0.0643	α=0.0643
10150	(32)+		561.1	E2	0.01230	α=0.01230
10429	33-		321.3	E2	0.0562	B(E2)(W.u.)=2.5 5, α=0.0562
11897	(36+)		236.2	E2	0.1460	α=0.1460
11897	(36+)		393.6	M1+E2	0.048	α=0.048 17
13500	(38)		1603.5	E2	0.00144	α=0.00144
14000	(38)		2103.5	E2	0.00114	α=0.00114
14382	(39)		1172.5	E2	0.00244	α=0.00244
14676	(39)		1466.3	E2	0.00164	α=0.00164
14921	(41)		652.5	E2	0.00856	α=0.00856
696.37+X	J1+2		696.37 17	[E2]	0.00736	α=0.00736
1430.72+X	J1+4		734.35 5	E2	0.00652	α=0.00652
2207.93+X	J1+6		777.21 8	E2	0.00575	α=0.00575
3032.37+X	J1+8		824.44 7	[E2]	0.00505	α=0.00505
3907.13+X	J1+10		874.76 6	[E2]	0.00445	α=0.00445
4834.58+X	J1+12		927.45 9	E2	0.00393	α=0.00393
5814.46+X	J1+14		979.88 8	E2	0.00351	α=0.00351
6847.0+X	J1+16		1032.58 9	E2	0.00315	α=0.00315
7932.7+X	J1+18		1085.61 10	E2	0.00284	α=0.00284
9070.6+X	J1+20		1137.98 13	E2	0.00259	α=0.00259
10261.6+X	J1+22		1190.95 23	E2	0.00237	α=0.00237
11504.5+X	J1+24		1242.93 11	[E2]	0.00210	α=0.00210
12804.9+X	J1+26		1300.39 18	[E2]	0.00201	α=0.00201
14154.4+X	J1+28		1349.49 20	[E2]	0.00188	α=0.00188
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data

Q(β-)=-8178 keV 15	S(n)= 10208 keV 10	S(p)= 4882 keV 7	Q(α)= 4280 keV 3
S(2n)= 18247 keV 10	S(2p)= 7065 keV 7	Q(EC)= 2034 keV 9
Reference: 2017WA10

References:
A	¹⁵⁴Tm ε decay (8.1 S)	B	¹⁵⁴Tm ε decay (3.30 S)
C	(HI,xnγ)	D	(HI,xnγ):SD
E	¹⁵⁸Yb α decay

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0	A B C E	0+	3.73 m 9 % ε = 99.53 13 % α = 0.47 13
560.8 1	A B C	2+		560.8 1	100	E2	0	0+
1162.2 1	B C	4+		601.4 1	100	E2	560.8	2+
1787.6 2	B C	6+		625.4 1	100	E2	1162.2	4+
1896	C	5-		735	100	D	1162.2	4+
2329.5 2	B C	8+		541.9 2	100	E2	1787.6	6+
2461	C	7-		565.0 674.5	16 100	D	1896 1787.6	5- 6+
2583.6 3	C	8+		253.8 796.0 2	33 100	D E2	2329.5 1787.6	8+ 6+
3014	C	9-		432.2 553.8 686.3	100 85 65	D E2 D	2583.6 2461 2329.5	8+ 7- 8+
3016	C	10+		687.8	100	E2	2329.5	8+
3025	C	11-	39 ns 4 % IT ≈ 100 % α ≈ 0	9S 11S			3016 3014	10+ 9-
3655	C	12+		638.5	100	E2	3016	10+
3830	C	13-		805.0	100	E2	3025	11-
4274	C	14+		619.5	100	E2	3655	12+
4499	C	15-		668.8	100	E2	3830	13-
4531	C	(15+)		256.8	100	D	4274	14+
4678	C	16+		146.7 403.5	33 100	D E2	4531 4274	(15+) 14+
5006	C	17-		506.9	100	E2	4499	15-
5328	C	18+		650.8	100	E2	4678	16+
5462	C	19-		134.1 455.6	1.8 100	D E2	5328 5006	18+ 17-
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
6063	C	20+		735	100	E2	5328	18+
6087	C	(20-)		625	100	D	5462	19-
6289	C	21-		202.2 827.5	69 100	M1+E2 E2	6087 5462	(20-) 19-
6575?	C	(21-)		1113.7	100	E2	5462	19-
6745	C	22+		682.0	100		6063	20+
7015	C	23-		270.7 441.0 726.7	2.1 5 100	D E2 E2	6745 6575 6289	22+ (21-) 21-
7334	C	25-		318.3	100	E2	7015	23-
8009	C	(26)-		675.5	100	M1+E2	7334	25-
8106	C	27-		97.0 772.6	27 100	D E2	8009 7334	(26)- 25-
8310	C	(26+)		976.3	100	D	7334	25-
8658	C	(27+)		347.4 647.8	88 100	D D	8310 8009	(26+) (26)-
8669	C	(28)+		359.0 562.9	2 100	E1	8310 8106	(26+) 27-
9294	C	(29+)		625	100	D	8669	(28)+
9475	C	29-		1368.8	100	E2	8106	27-
9480	C	(29+)		811.4	100	D	8669	(28)+
9589	C	(30)+		108.5 113.8 294.5 919.7	12 2 100 90	D M1+E2 E2	9480 9475 9294 8669	(29+) 29- (29+) (28)+
9843	C	(30+)		362.7	100		9480	(29+)
10108	C	31-		265.0 518.8 632.8	42 38 100	D D E2	9843 9589 9475	(30+) (30)+ 29-
10150	C	(32)+		307.1 561.1	14 100	E2 E2	9843 9589	(30+) (30)+
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
10429	C	33-		279.2 321.3	100 24	D E2	10150 10108	(32)+ 31-
11354	C	(34)		924.5	100	D	10429	33-
11504?	C	(35)		150.0	100	D	11354	(34)
11621	C	(34+)		1192.3 1471	100 30	D	10429 10150	33- (32)+
11660	C	(34+)		1231.5	100	D	10429	33-
11889	C	(35)		267.6	100	D	11621	(34+)
11897	C	(36+)		236.2 275.2 393.6	11 5 100	E2 M1+E2	11660 11621 11504	(34+) (34+) (35)
13209	C	(37)		1313.0	100	D	11897	(36+)
13500	C	(38)		1603.5	100	E2	11897	(36+)
13950?	C	(40)		450.1	100		13500	(38)
14000	C	(38)		500.0 2103.5	100 38	D E2	13500 11897	(38) (36+)
14269	C	(39)		268.7	100	D	14000	(38)
14382	C	(39)		1172.5	100	E2	13209	(37)
14676	C	(39)		1466.3	100	E2	13209	(37)
14921	C	(41)		652.5	100	E2	14269	(39)
16030	C	(42)		1108.5	100	D	14921	(41)
X	D	J1
696.37+X 17	D	J1+2		696.37 17	100	[E2]	X	J1
1430.72+X 18	D	J1+4		734.35 5	100	E2	696.37+X	J1+2
2207.93+X 20	D	J1+6		777.21 8	100	E2	1430.72+X	J1+4
3032.37+X 21	D	J1+8		824.44 7	100	[E2]	2207.93+X	J1+6
3907.13+X 22	D	J1+10		874.76 6	100	[E2]	3032.37+X	J1+8
4834.58+X 24	D	J1+12		927.45 9	100	E2	3907.13+X	J1+10
5814.46+X 25	D	J1+14		979.88 8	100	E2	4834.58+X	J1+12
6847.0+X 3	D	J1+16		1032.58 9	100	E2	5814.46+X	J1+14
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
7932.7+X 3	D	J1+18		1085.61 10	100	E2	6847.0+X	J1+16
9070.6+X 3	D	J1+20		1137.98 13	100	E2	7932.7+X	J1+18
10261.6+X 4	D	J1+22		1190.95 23	100	E2	9070.6+X	J1+20
11504.5+X 4	D	J1+24		1242.93 11	100	[E2]	10261.6+X	J1+22
12804.9+X 5	D	J1+26		1300.39 18	100	[E2]	11504.5+X	J1+24
14154.4+X 5	D	J1+28		1349.49 20	100	[E2]	12804.9+X	J1+26
Y	D	J2
744.73+Y 20	D	J2+2		744.73 20	100		Y	J2
1533.57+Y 25	D	J2+4		788.84 15	100		744.73+Y	J2+2
2367.0+Y 3	D	J2+6		833.45 7	100		1533.57+Y	J2+4
3246.1+Y 3	D	J2+8		879.04 8	100		2367.0+Y	J2+6
4171.6+Y 4	D	J2+10		925.56 17	100		3246.1+Y	J2+8
5143.8+Y 4	D	J2+12		972.13 11	100		4171.6+Y	J2+10
6162.1+Y 4	D	J2+14		1018.36 15	100		5143.8+Y	J2+12
7227.6+Y 4	D	J2+16		1065.53 10	100		6162.1+Y	J2+14
8340.2+Y 4	D	J2+18		1112.59 11	100		7227.6+Y	J2+16
9499.0+Y 5	D	J2+20		1158.81 12	100		8340.2+Y	J2+18
10706.2+Y 5	D	J2+22		1207.19 13	100		9499.0+Y	J2+20
11959.6+Y 5	D	J2+24		1253.39 18	100		10706.2+Y	J2+22
13260.2+Y 6 ?	D	J2+26		1300.54 24 ?	100		11959.6+Y	J2+24

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - Positive-parity level sequence.
0	0+	3.73 m 9 % ε = 99.53 13 % α = 0.47 13
560.8 1	2+		560.8 1	100	E2	0	0+
1162.2 1	4+		601.4 1	100	E2	560.8	2+
1787.6 2	6+		625.4 1	100	E2	1162.2	4+
2329.5 2	8+		541.9 2	100	E2	1787.6	6+
3016	10+		687.8	100	E2	2329.5	8+
3655	12+		638.5	100	E2	3016	10+
4274	14+		619.5	100	E2	3655	12+
4678	16+		146.7 403.5	33 100	D E2	4531 4274	(15+) 14+
5328	18+		650.8	100	E2	4678	16+
6063	20+		735	100	E2	5328	18+
6745	22+		682.0	100		6063	20+
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - Negative-parity level sequence.
1896	5-
2461	7-		565.0 674.5	16 100	D	1896 1787.6	5- 6+
3014	9-		432.2 553.8 686.3	100 85 65	D E2 D	2583.6 2461 2329.5	8+ 7- 8+
3025	11-	39 ns 4 % IT ≈ 100 % α ≈ 0	9S 11S			3016 3014	10+ 9-
3830	13-		805.0	100	E2	3025	11-
4499	15-		668.8	100	E2	3830	13-
5006	17-		506.9	100	E2	4499	15-
5462	19-		134.1 455.6	1.8 100	D E2	5328 5006	18+ 17-
6289	21-		202.2 827.5	69 100	M1+E2 E2	6087 5462	(20-) 19-
7015	23-		270.7 441.0 726.7	2.1 5 100	D E2 E2	6745 6575 6289	22+ (21-) 21-
7334	25-		318.3	100	E2	7015	23-
8106	27-		97.0 772.6	27 100	D E2	8009 7334	(26)- 25-
9475	29-		1368.8	100	E2	8106	27-
10108	31-		265.0 518.8 632.8	42 38 100	D D E2	9843 9589 9475	(30+) (30)+ 29-
10429	33-		279.2 321.3	100 24	D E2	10150 10108	(32)+ 31-
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 3 - SD-1 band; probable triaxial shape based on a single
X	J1
696.37+X 17	J1+2		696.37 17	100	[E2]	X	J1
1430.72+X 18	J1+4		734.35 5	100	E2	696.37+X	J1+2
2207.93+X 20	J1+6		777.21 8	100	E2	1430.72+X	J1+4
3032.37+X 21	J1+8		824.44 7	100	[E2]	2207.93+X	J1+6
3907.13+X 22	J1+10		874.76 6	100	[E2]	3032.37+X	J1+8
4834.58+X 24	J1+12		927.45 9	100	E2	3907.13+X	J1+10
5814.46+X 25	J1+14		979.88 8	100	E2	4834.58+X	J1+12
6847.0+X 3	J1+16		1032.58 9	100	E2	5814.46+X	J1+14
7932.7+X 3	J1+18		1085.61 10	100	E2	6847.0+X	J1+16
9070.6+X 3	J1+20		1137.98 13	100	E2	7932.7+X	J1+18
10261.6+X 4	J1+22		1190.95 23	100	E2	9070.6+X	J1+20
11504.5+X 4	J1+24		1242.93 11	100	[E2]	10261.6+X	J1+22
12804.9+X 5	J1+26		1300.39 18	100	[E2]	11504.5+X	J1+24
14154.4+X 5	J1+28		1349.49 20	100	[E2]	12804.9+X	J1+26
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 4 - SD-2 band; probable prolate shape, with conf π6⁴ν7².
Y	J2
744.73+Y 20	J2+2		744.73 20	100		Y	J2
1533.57+Y 25	J2+4		788.84 15	100		744.73+Y	J2+2
2367.0+Y 3	J2+6		833.45 7	100		1533.57+Y	J2+4
3246.1+Y 3	J2+8		879.04 8	100		2367.0+Y	J2+6
4171.6+Y 4	J2+10		925.56 17	100		3246.1+Y	J2+8
5143.8+Y 4	J2+12		972.13 11	100		4171.6+Y	J2+10
6162.1+Y 4	J2+14		1018.36 15	100		5143.8+Y	J2+12
7227.6+Y 4	J2+16		1065.53 10	100		6162.1+Y	J2+14
8340.2+Y 4	J2+18		1112.59 11	100		7227.6+Y	J2+16
9499.0+Y 5	J2+20		1158.81 12	100		8340.2+Y	J2+18
10706.2+Y 5	J2+22		1207.19 13	100		9499.0+Y	J2+20
11959.6+Y 5	J2+24		1253.39 18	100		10706.2+Y	J2+22
13260.2+Y 6	J2+26		1300.54 24 ?	100		11959.6+Y	J2+24

E(level)	J^π(level)	T_1/2(level)	Comments
0	0+	3.73 m 9 % ε = 99.53 13 % α = 0.47 13	From an evaluation of data on nuclear rms charge radii, 2004An14 report <r²>^1/2=5.102~fm~30. E(level): From an evaluation of data on nuclear rms charge radii, 2004An14 report <r²>^1/2=5.102~fm~30. Positive-parity level sequence.
560.8	2+		E(level): Positive-parity level sequence.
1162.2	4+		E(level): Positive-parity level sequence.
1787.6	6+		E(level): Positive-parity level sequence.
1896	5-		E(level): Negative-parity level sequence.
2329.5	8+		E(level): Positive-parity level sequence.
2461	7-		E(level): Negative-parity level sequence.
3014	9-		E(level): Negative-parity level sequence.
3016	10+		E(level): Positive-parity level sequence.
3025	11-	39 ns 4 % IT ≈ 100 % α ≈ 0	μ=+0.169 13 E(level): Negative-parity level sequence.
3655	12+		E(level): Positive-parity level sequence.
3830	13-		E(level): Negative-parity level sequence.
4274	14+		E(level): Positive-parity level sequence.
4499	15-		E(level): Negative-parity level sequence.
4678	16+		E(level): Positive-parity level sequence.
5006	17-		E(level): Negative-parity level sequence.
5328	18+		E(level): Positive-parity level sequence.
5462	19-		E(level): Negative-parity level sequence.
6063	20+		E(level): Positive-parity level sequence.
6289	21-		E(level): Negative-parity level sequence.
6745	22+		E(level): Positive-parity level sequence.
7015	23-		E(level): Negative-parity level sequence.
7334	25-		E(level): Negative-parity level sequence.
8106	27-		E(level): Negative-parity level sequence.
9475	29-		E(level): Negative-parity level sequence.
E(level)	J^π(level)	T_1/2(level)	Comments
10108	31-		E(level): Negative-parity level sequence.
10429	33-		E(level): Negative-parity level sequence.
X	J1		E(level): SD-1 band; probable triaxial shape based on a single.
696.37+X	J1+2		E(level): SD-1 band; probable triaxial shape based on a single.
1430.72+X	J1+4		E(level): SD-1 band; probable triaxial shape based on a single.
2207.93+X	J1+6		E(level): SD-1 band; probable triaxial shape based on a single.
3032.37+X	J1+8		E(level): SD-1 band; probable triaxial shape based on a single.
3907.13+X	J1+10		E(level): SD-1 band; probable triaxial shape based on a single.
4834.58+X	J1+12		E(level): SD-1 band; probable triaxial shape based on a single.
5814.46+X	J1+14		E(level): SD-1 band; probable triaxial shape based on a single.
6847.0+X	J1+16		E(level): SD-1 band; probable triaxial shape based on a single.
7932.7+X	J1+18		E(level): SD-1 band; probable triaxial shape based on a single.
9070.6+X	J1+20		E(level): SD-1 band; probable triaxial shape based on a single.
10261.6+X	J1+22		E(level): SD-1 band; probable triaxial shape based on a single.
11504.5+X	J1+24		E(level): SD-1 band; probable triaxial shape based on a single.
12804.9+X	J1+26		E(level): SD-1 band; probable triaxial shape based on a single.
14154.4+X	J1+28		E(level): SD-1 band; probable triaxial shape based on a single.
Y	J2		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
744.73+Y	J2+2		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
1533.57+Y	J2+4		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
2367.0+Y	J2+6		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
3246.1+Y	J2+8		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
4171.6+Y	J2+10		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
5143.8+Y	J2+12		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
6162.1+Y	J2+14		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
E(level)	J^π(level)	T_1/2(level)	Comments
7227.6+Y	J2+16		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
8340.2+Y	J2+18		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
9499.0+Y	J2+20		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
10706.2+Y	J2+22		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
11959.6+Y	J2+24		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².
13260.2+Y	J2+26		E(level): SD-2 band; probable prolate shape, with conf π6⁴ν7².

E(level)	E(gamma)	Comments
4499	668.8	E(γ): 1981Wa04 argue 668.8 γ follows 805.0 γ.
6745	682.0	M(γ): γ(θ) of 1989Sc13 suggests dipole, but Jπ’s require E2.