Helium: 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/%)
 3He 0.137x10-5 % 3.01603       5330 b1/2+ -2.12762 nm    
 4He 100 % 4.0026        0+      
 5He   5.01222 0.76x10-21s n,alpha    3/2-      
 6He   6.018886 0.807s -/ 3.51    0+      
 7He   7.02803 0.3x10-20s n    3/2-      
 8He   8.03392 0.119s -/ 14
n
13/ 88
/ 12
 0+     0.9807/ 84
0.4776/ 5
 9He   9.0438   n