List of levels for 235NP

ADOPTED LEVELS, GAMMAS for ²³⁵Np

Authors: E. Browne, J. K. Tuli | Citation: Nucl. Data Sheets 122, 205 (2014) | Cutoff date: 1-Feb-2014

Full ENSDF file | Adopted Levels (PDF version)

Q(β-)=-1139 keV 21	S(n)= 6983 keV 8	S(p)= 4391.8 keV 9	Q(α)= 5194.0 keV 15
Reference: 2012WA38

References:
A	²³⁵Pu ε decay	B	²³⁹Am α decay
C	²³⁴U(³He,d),(α,t)	D	²³⁷Np(p,t)
E	²³⁷Np(¹¹⁶Sn,118SNG)

Other reactions:

²³⁵U(p,nf), ²³⁵U(d,2nf) (1998Er01,1997Er09). Other: 1995Da18.

²³⁶U(p,2n), ²³⁷Np(³He,2np) (1996Aa03)

²³⁸U(p,4n) (1994Be52)

²³⁵U(d,2n) (1993Be64)

Levels: band(a) 5/2[642], α=-1/2. The πh_9/2, 5/2[523] assignment is also possible (2010Hu02)

E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
0	A B C D E	5/2+	396.1 d 12 % ε = 99.99740 13 % α = 0.00260 13
34.23 10	A D E	(7/2)+		34.23 10	100	[M1+E2]	0	5/2+
49.10 10	A B C	(5/2)-	6.9 ns 3	49.10 10	100	E1	0	5/2+
79.1 4	A C D E	(9/2+)		78?	100		0	5/2+
91.6 3	B	(7/2)-
133 2	D E	(11/2)+		101?	100		34.23	(7/2)+
146.8 7	B C	(9/2)-
206.2 10	C D E	(13/2)+		127.1 10	100		79.1	(9/2+)
276.4 10	E	(15/2+)		143.4 10	100		133	(11/2)+
352 2	C	(3/2-)
359.9 15	E	(17/2+)		153.7 10	100		206.2	(13/2)+
371 3 ?	C	(1/2-)
408 2	C	(7/2-)
441 3	C	(5/2-)
463.0 15	E	(19/2+)		186.6 10	100		276.4	(15/2+)
520 1	C	(11/2-)
560.4 18	E	(21/2+)		200.5 10	100		359.9	(17/2+)
565 1	C	(3/2-)
602 3	C	(5/2-)
644 1	C	(7/2-)
≈681	C
690.4 18	E	(23/2+)		227.4 10	100		463.0	(19/2+)
700 3	C	(9/2-)
756.4 3	A	(3/2+,5/2,7/2)		722.2 5 756.4 3	1.0 3 100 4		34.23 0	(7/2)+ 5/2+
761 2	C	(11/2-)
779.5 2	A	(3/2+,5/2,7/2)		745.1 3 779.6 3	100 9 41 4		34.23 0	(7/2)+ 5/2+
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
806.3 20	E	(25/2+)		245.9 10	100		560.4	(21/2+)
819.0 4	A C	(5/2+,7/2)		739.8 4 785.0 4	100 20 60 20		79.1 34.23	(9/2+) (7/2)+
834 4	D	5/2+
870 3	C
922 1	C	(7/2-)
936.8 3	A	(5/2+,7/2)		858.0 5 902.6 4 936.7 4	60 20 100 13 60 20		79.1 34.23 0	(9/2+) (7/2)+ 5/2+
944.5 2	A	(3/2+,5/2,7/2)		910.1 3 944.7 3	100 3 69 3		34.23 0	(7/2)+ 5/2+
956.1 20	E	(27/2+)		265.7 10	100		690.4	(23/2+)
962 2	D
978 1	C	(9/2-)
998 1	D
1024 1	C D
1064 2	C	(9/2-)
1088.9 23	E	(29/2+)		282.6 10	100		806.3	(25/2+)
1117 3	C
1160 2	C	(13/2+)
1227 3	C
1256.1 23	E	(31/2+)		300.0 10	100		956.1	(27/2+)
1260 2	C D	5/2+
1293 6	D
1310 2	C
1364 2	C
1405.3 25	E	(33/2+)		316.4 10	100		1088.9	(29/2+)
1510 2	C
1588.0 25	E	(35/2+)		331.9 10	100		1256.1	(31/2+)
1607 2	C
E(level) (keV)	XREF	J^π(level)	T_1/2(level)	E(γ) (keV)	I(γ)	M(γ)	Final Levels
1675 4	C
1696 2	C
1752 3	E	(37/2+)		346.3 10	100		1405.3	(33/2+)
1818 2	D	5/2+
1845 3	C	(7/2-)
1918 4	C
1948 3	E	(39/2+)		360.4 10	100		1588.0	(35/2+)
2050 5	C
2124 3	E	(41/2+)		372.4 10	100		1752	(37/2+)
2336 3	E	(43/2+)		387.8 10	100		1948	(39/2+)
2526 3	E	(45/2+)		402.4 10	100		2124	(41/2+)
2751 3	E	(47/2+)		414.9 10	100		2336	(43/2+)
2952 4	E	(49/2+)		425.3 10	100		2526	(45/2+)
3191 4 ?	E	(51/2+)		439.5 10 ?	100		2751	(47/2+)
3401 4 ?	E	(53/2+)		449.4 10 ?	100		2952	(49/2+)

J^π(level): For members of 5/2⁺[642] bands Jπ are from 2010Hu02, based on the assumption of πi_13/2 orbital and comparison with the g.s. and assignments in ²³⁷Np. 2010Hu02 point out that πh_9/2, 5/2[523] assignment, thus a negative-parity sequence cannot be ruled out.

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 1 - 5/2[642], α=+1/2.
0	5/2+	396.1 d 12 % ε = 99.99740 13 % α = 0.00260 13
79.1 4	(9/2+)		78?	100		0	5/2+
206.2 10	(13/2)+		127.1 10	100		79.1	(9/2+)
359.9 15	(17/2+)		153.7 10	100		206.2	(13/2)+
560.4 18	(21/2+)
806.3 20	(25/2+)		245.9 10	100		560.4	(21/2+)
1088.9 23	(29/2+)
1405.3 25	(33/2+)		316.4 10	100		1088.9	(29/2+)
1752 3	(37/2+)		346.3 10	100		1405.3	(33/2+)
2124 3	(41/2+)
2526 3	(45/2+)		402.4 10	100		2124	(41/2+)
2952 4	(49/2+)
3401 4	(53/2+)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 2 - 5/2[523]
49.10 10	(5/2)-	6.9 ns 3
91.6 3	(7/2)-
146.8 7	(9/2)-
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 3 - 1/2[530]
352 2	(3/2-)
371 3	(1/2-)
408 2	(7/2-)
441 3	(5/2-)
520 1	(11/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 4 - 3/2[521]
565 1	(3/2-)
602 3	(5/2-)
644 1	(7/2-)
700 3	(9/2-)
761 2	(11/2-)
E(level) (keV)	J^π(level)	T_1/2(level)	E(γ)	I(γ)	M(γ)	Final Levels
Band 5 - 7/2[633]?
1160 2	(13/2+)

E(level) (keV)	J^π(level)	T_1/2(level)	E(γ) (keV)	Multipolarity	Conversion Coefficient	Additional Data
34.23	(7/2)+		34.23 10	[M1+E2]	1.3×10³	α=1.3×10³ 12, α(L)=1.0E3 9, α(M)=2.6E2 24, α(N)=7.E1 7, α(O)=17 16, α(P)=2.7 25, α(Q)=0.016 6, α(N+)=9.E1 9
49.10	(5/2)-	6.9 ns 3	49.10 10	E1	0.833	α=0.833 13, α(L)=0.624 10, α(M)=0.1559 24, α(N)=0.0414 7, α(O)=0.00953 15, α(P)=0.001529 23, α(Q)=5.38×10^-5 8, α(N+)=0.0525 8

E(level)	J^π(level)	T_1/2(level)	Comments
0	5/2+	396.1 d 12 % ε = 99.99740 13 % α = 0.00260 13	%α from measurements of x-rays from ²³⁵Np and ²³⁶Np ε decay, and α particles from ²³⁷Np α decay (1986AgZV). E(level): %α from measurements of x-rays from ²³⁵Np and ²³⁶Np ε decay, and α particles from ²³⁷Np α decay (1986AgZV). 5/2[642], α=+1/2.
49.10	(5/2)-	6.9 ns 3	E(level): 5/2[523].
79.1	(9/2+)		E(level): 5/2[642], α=+1/2.
91.6	(7/2)-		E(level): 5/2[523].
146.8	(9/2)-		E(level): 5/2[523].
206.2	(13/2)+		E(level): 5/2[642], α=+1/2.
352	(3/2-)		E(level): 1/2[530]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
359.9	(17/2+)		E(level): 5/2[642], α=+1/2.
371	(1/2-)		E(level): 1/2[530]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
408	(7/2-)		E(level): 1/2[530]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
441	(5/2-)		E(level): 1/2[530]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
520	(11/2-)		E(level): 1/2[530]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
560.4	(21/2+)		E(level): 5/2[642], α=+1/2.
565	(3/2-)		E(level): 3/2[521]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
602	(5/2-)		E(level): 3/2[521]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
644	(7/2-)		E(level): 3/2[521]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
700	(9/2-)		E(level): 3/2[521]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
761	(11/2-)		E(level): 3/2[521]. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
806.3	(25/2+)		E(level): 5/2[642], α=+1/2.
922	(7/2-)		J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections. configuration=7/2[514]?.
978	(9/2-)		J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections. configuration=7/2[514]?.
1064	(9/2-)		J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections. configuration=7/2[514]?.
1088.9	(29/2+)		E(level): 5/2[642], α=+1/2.
1160	(13/2+)		E(level): 7/2[633]?. J^π(level): From (³He,α) based on transferred L-values, systematics of Nilsson configuration assignments, and reaction cross sections.
1405.3	(33/2+)		E(level): 5/2[642], α=+1/2.
E(level)	J^π(level)	T_1/2(level)	Comments
1752	(37/2+)		E(level): 5/2[642], α=+1/2.
2124	(41/2+)		E(level): 5/2[642], α=+1/2.
2526	(45/2+)		E(level): 5/2[642], α=+1/2.
2952	(49/2+)		E(level): 5/2[642], α=+1/2.
3401	(53/2+)		E(level): 5/2[642], α=+1/2.