Isotopes of Neptunium (Z=93)
Click on an isotope to get more information about its decay
|
Isotope
|
Half-life
|
Spin
Parity
|
Decay Mode(s) or
Abundance |
|---|
| 225Np
| 6 ms |
|
%A=?
|
|---|
| 226Np
| 35 ms |
|
%A=100
|
|---|
| 227Np
| 0.51 s |
|
%A=100, %EC+%B+ ~ 0.05
|
|---|
| 228Np
| 61.4 s |
|
%EC=60 7, %A=40 7, %ECSF=0.020 9
|
|---|
| 229Np
| 4.0 m |
|
%A > 50, %EC < 50
|
|---|
| 230Np
| 4.6 m |
|
%EC+%B+ < 97, %A > 3
|
|---|
| 231Np
| 48.8 m | (5/2)
|
%EC=98 1, %A=2 1
|
|---|
| 232Np
| 14.7 m | (4+)
|
%EC+%B+=100
|
|---|
| 233Np
| 36.2 m | (5/2+)
|
%EC=100, %A < 0.001
|
|---|
| 234Np
| 4.4 d | (0+)
|
%EC+%B+=100
|
|---|
| 235Np
| 396.1 d | 5/2+
|
%EC=99.99740 13, %A=0.00260 13
|
|---|
| 236Np
| 1.54e5 y | (6-)
|
%EC=87.3 5, %B-=12.5 5, %A=0.16 4
|
|---|
| 236m1Np
| 22.5 h | 1
|
%EC=52 1, %B-=48 1
|
|---|
| 237Np
| 2.144e+6 y | 5/2+
|
%A=100, %SF < 2E-10
|
|---|
| 237m1Np
| 45 ns |
|
|
|---|
| 238Np
| 2.117 d | 2+
|
%B-=100
|
|---|
| 238m1Np
| 112 ns |
|
|
|---|
| 239Np
| 2.3565 d | 5/2+
|
%B-=100
|
|---|
| 240Np
| 61.9 m | (5+)
|
%B-=100
|
|---|
| 240m1Np
| 7.22 m | 1(+)
|
%B-=99.89 3, %IT=0.11 3
|
|---|
| 241Np
| 13.9 m | (5/2+)
|
%B-=100
|
|---|
| 242Np
| 5.5 m | (6)
|
%B-=100
|
|---|
| 242m1Np
| 2.2 m | (1+)
|
%B-=100
|
|---|
| 243Np
| 1.8 m | (5/2-)
|
%B-=100
|
|---|
| 244Np
| 2.29 m | (7-)
|
%B-=100
|
|---|
Isotope Explorer Nuclear Structure and Decay Data
8th Edition of the Table of Isotopes
Isotopes Project Home Page
Lawrence Berkeley National Laboratory