List of levels for 236NP

ADOPTED LEVELS for ²³⁶Np

Author: Shaofei Zhu Citation: Nucl. Data Sheets 182, 2 (2022). Cutoff date: 1-Apr-2022

Full ENSDF file

Q(β-)=4.8E+2 keV 5 S(n)= 5.74E+3 keV 5 S(p)= 4.83E+3 keV 5 Q(α)= 5.01E+3 keV 5
Reference: 2021WA16

E(level)
(keV) XREF Jπ(level) T_1/2(level)
    0 A 6(-) 1.55×10⁺⁵ y 1
% β^- = 12.0 1
% ε = 87.8 2
% α = 0.16 4

   57 51 A 1(-) 22.5 h 4
% β^- = 49 1
% ε = 51 1

  241 50 A (3-)
  283 50 A (4-)
  334 50 A (5-)

Additional Level data and comments:

E(level) Comments
    0 Jπ(level): ε decay to 6⁺ level in ²³⁶U and β^- decay to 6⁺ level in ²³⁶Pu; no ε decay and β^- decay to 2⁺ or 0⁺ levels; large log ft values suggesting large K-hinderance and possible configuration=((π5/2[642])-(ν 7/2[743])) or ((π 5/2[523])-(ν 7/2[743])) while Gallagher-Moszkowski rule favors ((π5/2[642])-(ν 7/2[743])) with Jπ=6- for lower energy (1981Li30). Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
   57 E(level): deduced from E(β^-,²³⁶Np(22.5 h))=537 keV 8 (1969Le05) and Q(β^-,²³⁶Np(g.s.))=480 keV 50 (2021Wa16).
Jπ(level): ε decay to 0⁺,2⁺ and 1- levels in ²³⁶U and β^- decay to 0⁺ and 2⁺ levels in ²³⁶Pu; Gallagher-Moszkowski rule favors ((π5/2[642])-(ν 7/2[743])) with Jπ=1- for higher energy (1981Li30).
T_1/2(level): from 1969Le05 and 1949Ja01.
  241 E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631].
Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
  283 E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631].
Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
  334 E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631].
Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.

General Comments:

Fission T_1/2, Cross section: 1998Er01, 1998Ro17, 1992Gr16, 1990Ro23, 1989Ko12, 1987Gr34
Q-value: S(2n)=12720 50, S(2p)=11540 50 (2021Wa16 )

Q(β-)=4.8E+2 keV 5	S(n)= 5.74E+3 keV 5	S(p)= 4.83E+3 keV 5	Q(α)= 5.01E+3 keV 5
Reference: 2021WA16

E(level) (keV)	XREF	Jπ(level)	T_1/2(level)
0	A	6(-)	1.55×10⁺⁵ y 1 % β^- = 12.0 1 % ε = 87.8 2 % α = 0.16 4
57 51	A	1(-)	22.5 h 4 % β^- = 49 1 % ε = 51 1
241 50	A	(3-)
283 50	A	(4-)
334 50	A	(5-)

E(level)	Comments
0	Jπ(level): ε decay to 6⁺ level in ²³⁶U and β^- decay to 6⁺ level in ²³⁶Pu; no ε decay and β^- decay to 2⁺ or 0⁺ levels; large log ft values suggesting large K-hinderance and possible configuration=((π5/2[642])-(ν 7/2[743])) or ((π 5/2[523])-(ν 7/2[743])) while Gallagher-Moszkowski rule favors ((π5/2[642])-(ν 7/2[743])) with Jπ=6- for lower energy (1981Li30). Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
57	E(level): deduced from E(β^-,²³⁶Np(22.5 h))=537 keV 8 (1969Le05) and Q(β^-,²³⁶Np(g.s.))=480 keV 50 (2021Wa16). Jπ(level): ε decay to 0⁺,2⁺ and 1- levels in ²³⁶U and β^- decay to 0⁺ and 2⁺ levels in ²³⁶Pu; Gallagher-Moszkowski rule favors ((π5/2[642])-(ν 7/2[743])) with Jπ=1- for higher energy (1981Li30). T_1/2(level): from 1969Le05 and 1949Ja01.
241	E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631]. Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
283	E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631]. Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.
334	E(level): from ²⁴⁰Am α decay. π 5/2[523]+NU 1/2[631]. Jπ(level): Favored α decay from ((π5/2[523])-(ν 1/2[631]))3- with Iα and Eα in agreement with the rotational band built on this configuration.