List of levels for 240AM

ADOPTED LEVELS for ²⁴⁰Am

Author: C. Morse | Citation: Nucl. Data Sheets 206, 359 (2025) | Cutoff date: 27-Sep-2024

Full ENSDF file | Adopted Levels (PDF version)

Q(β-)=-214 keV 14	S(n)= 5952 keV 14	S(p)= 4367 keV 14	Q(α)= 5.71×10³ keV 5
Reference: 2021Wa16

References:
A	²⁴⁴Bk α decay	B	²⁴¹Am(d,t)

XREFs

J^π

T_1/2/Decay

E(level) (keV)	XREF	J^π(level)	T_1/2(level)
0	A B	(3-)	50.8 h 3 % ε = 99.99981 7 % α = 1.9×10^-4 7
40 5	A B	(4-)
53	B	(2-)
87	B	(3-)
96	B	(5-)
130	B	(4-)
158	B	(6-)
186	B	(5-)
213	B
233	B	(7-)
252	B	(6-)
281	B
316	B	(8-)
329	B	(7-)
346	B	(1-)
398	B	(3-)&(5-)
423	B	(2-)
458	B	(6-)
474	B
498	B	(4-)&(5-)
534	B	(7-)
551	B
616	B	(6-)
640	B	(7-)
660	B
757	B
777	B
809	B
E(level) (keV)	XREF	J^π(level)	T_1/2(level)
819	B
845	B
856	B
877	B
898	B
917	B
932	B
956	B
973	B	(3+)
997	B
1016	B	(2+)&(4+)
1052	B	(3+)
1066	B
1079	B
1194	B
1218	B
1235	B
1248	B
1305	B
1318	B
1335	B
1349	B
1372	B
1386	B
1407	B
1437	B
1495	B
1515	B
1545	B
3.20E+3 18			0.93 ms 3 % SF ≤ 100

E(level): From (d,t), unless stated otherwise.

J^π(level): Based on observed and theoretical cross section patterns for the bands (fingerprint method); rotational parameter α in the range 5-7; sequence of Nilsson orbitals in neighboring odd mass isotopes; Gallagher-Moszkowski coupling rule; and summed cross sections for two bands belonging to the same Nilsson neutron orbital should be equal. These rules are best obeyed for the π5/2[523]~#ν1/2[631] bands.

E(level) (keV)	J^π(level)	T_1/2(level)
Band 1 - \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
0	(3-)	50.8 h 3 % ε = 99.99981 7 % α = 1.9×10^-4 7
40 5	(4-)
96	(5-)
158	(6-)
233	(7-)
316	(8-)
E(level) (keV)	J^π(level)	T_1/2(level)
Band 2 - \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
53	(2-)
87	(3-)
130	(4-)
186	(5-)
252	(6-)
329	(7-)
E(level) (keV)	J^π(level)	T_1/2(level)
Band 3 - \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-.
346	(1-)
398	(3-)&(5-)
423	(2-)
498	(4-)&(5-)
616	(6-)
640	(7-)
E(level) (keV)	J^π(level)	T_1/2(level)
Band 4 - \|[π5/2[523]~#ν5/2[622]\|]_K^π=5^-.
398	(3-)&(5-)
458	(6-)
534	(7-)
616	(6-)
E(level) (keV)	J^π(level)	T_1/2(level)
Band 5 - \|[π5/2[523]~#ν1/2[501]\|]_K^π=3⁺.
973	(3+)
1016	(2+)&(4+)
E(level) (keV)	J^π(level)	T_1/2(level)
Band 6 - \|[π5/2[523]~#ν1/2[501]\|]_K^π=2⁺.
1016	(2+)&(4+)
1052	(3+)

E(level)	J^π(level)	T_1/2(level)	Comments
0	(3-)	50.8 h 3 % ε = 99.99981 7 % α = 1.9×10^-4 7	%β^-<6×10^-6 (1960Gl01). E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
40	(4-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
53	(2-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
87	(3-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
96	(5-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
130	(4-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
158	(6-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
186	(5-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
233	(7-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
252	(6-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
316	(8-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=3^-.
329	(7-)		E(level): \|[π5/2[523]~#ν1/2[631]\|]_K^π=2^-.
346	(1-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-.
398	(3-)&(5-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-. \|[π5/2[523]~#ν5/2[622]\|]_K^π=5^-. Doublet.
423	(2-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-.
458	(6-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=5^-.
498	(4-)&(5-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-. Doublet.
534	(7-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=5^-.
616	(6-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-. \|[π5/2[523]~#ν5/2[622]\|]_K^π=5^-. Doublet.
640	(7-)		E(level): \|[π5/2[523]~#ν5/2[622]\|]_K^π=0^-.
973	(3+)		E(level): \|[π5/2[523]~#ν1/2[501]\|]_K^π=3⁺.
1016	(2+)&(4+)		E(level): \|[π5/2[523]~#ν1/2[501]\|]_K^π=3⁺. \|[π5/2[523]~#ν1/2[501]\|]_K^π=2⁺. Doublet.
1052	(3+)		E(level): \|[π5/2[523]~#ν1/2[501]\|]_K^π=2⁺.
3.20E+3		0.93 ms 3 % SF ≤ 100	Δ<r²>(^242mAm-^240mAm)(fission isomers)= -0.288 fm² 24 (1998Ba04).