Einsteinium: Properties


Isotopes
  Natural
Abun. (%)
Atomic
Mass
Half-
life
Decay Mode
/Energy (/MeV)
Part. En.
/Intensity
(MeV/%)
Cross-sect.
Ther. Neut.
(b)
Spin
(h/2 pi)
Magnetic
Dipl.Mom.
(nm)
Electric
Quad. Mom.
(b)
Gamma En.
/Intensity
(MeV/%)
 243Es   243.06947 21s alpha,E.C./ 3.8 7.89         
 244Es   244.07081 37s E.C./ 4.5
alpha
 
7.57/ 4
        
 245Es   245.07126 1.3m alpha/ 7.858
E.C./ 3
7.74         
 246Es   246.07292 7.7m E.C./ 3.8
alpha
 
7.35
        
 247Es   247.07359 4.8m E.C./ 2.42
alpha
 
7.32
        
 248Es   248.07544 26m E.C./ 3.05
alpha
 
6.87
        
 249Es   249.07634 1.7h E.C./ 1.39
alpha
 
6.77
 7/2+     0.3795
0.8132
 250mEs     2.2h E.C.,+    1-     Cf L x rays
Cf k x rays
0.9891
1.0319
 250Es   250.07866 8.6h E.C./ 2.1    6+     Cf L x rays
Cf k x rays
0.30339
0.34948
0.82883
 251Es   251.079986 1.38d E.C./ 0.38
alpha
 
6.462/ 0.05
6.492/ 0.4
 3/2-      
 252Es   252.082944 1.29y alpha,E.C./ 1.26 6.632/ 61
6.562/ 10.3
 5-      
 253Es   253.084818 20.47d alpha 6.633/ 89.8
6.5916/ 6.6
186 b7/2+ 4.1 nm 7 b 0.0418
0.3892
 254mEs     1.64d -,alpha/ 6.67 0.475
6.382
 2+ 2.9 nm 3.7 b Fm L x rays
Fm k x rays
0.6488
0.6938
 254Es   254.088019 276d alpha 6.429 28 b7+     0.064
 255Es   255.09027 40d -/ 0.3
alpha
 
6.26
55 b7/2+      
 256mEs     7.6h -    8+     0.218
0.232
0.862
 256Es   256.09356 25m -/ 1.7    1+