# Nuclear Data

Physical Constants
Value Quantity
p = 3.1415927 p = Circumference / radius
e = 2.7182818 base of natural logrithms
ln 2 = 0.693148 ln 2
h = 6.62619e-34 J s
= 6.62619e-27 erg s
Planck's constant
c = 2.997925e8 m/s
= 2.997925e10 cm/s
Speed of light
NA = 6.0221e23 /mol Avogadro's number
1 amu = 1.66053e-27 kg
= 1.4924e-10 J
= 931.4812 MeV
Atomic mass unit
& equivalence
qe = 1.60221e-19 C / e
= 4.80663e-10 esu/e
Charge per electron
me = 9.109558e-31 kg
= 5.4856e-4 amu
= 0.5110 MeV
Rest mass of
electron
mp = 1.672614e-27 kg
= 1.00727661 amu
= 938.2794 MeV
Rest mass of
proton
mH = 1.673525e-27 kg
= 1.00782503 amu
= 938.790 MeV
Rest mass of
hydrogen atom
mn = 1.674920e-27 kg
= 1.00866492 amu
= 939.57279 MeV
Rest mass of
neutron
F = 96486.7 C/mole
= 2.8946e14 esu/mole
R = 8.3145 J mole-1 K-1
= 0.08205 l atm mole-1 K-1
Ideal gas constant
k = 1.3800 J K-1 Boltzmann constant (R / N)

Masses (amu) of Some
Nuclides or Particles
electron, e 0.00054856
proton, p 1.00727661
H 1.00782503
neutron, n 1.00866492
Deuterium, d2.01410178
Tritium, T 3.01604927
3He2 3.01602931
4He2 4.00260325
5He2 5.01222363 He, n
5Li3 5.01253780 He, p
6Li3 6.01512228
7Li3 7.01600405
11C6 11.01143382 B, positron
12C6 12 exactly standard
13C6 13.00335484
14C6 14.00324199 N, e
14N7 14.00307401
24Mg12 23.98504
56Fe26 55.93494213
57Fe26 56.9353987
58Fe26 57.93328046
235U92 235.04392306
238U92 238.05078258
Conversion Factors
1 cal = 4.184 J (exactly)
= 4.184e7 erg
= 0.041293 L atm
= 3.830e20 eV