Symbols and Abbreviations Recommended by Commission on Symbols, Units, and Nomenclature of International Union of Pure and Applied Physics

Symbols and Abbreviations Recommended by Commission on Symbols, Units, and Nomenclature of International Union of Pure and Applied Physics

If no possibility of confusion exists, these symbols and abbreviations may be used without definition.

atomic number, proton number ................................................ mass number ................................................................. neutron n u m b e r : N = A-Z ................................................... charge of poslton ........................................................... electron mass ............................................................... proton, neutron mass ........................................................ nuclear mass ................................................................ atomic mass ................................................................. (unified) atomic mass constant: ms = Ma(12C)/12 ............................ magnetic moment of particle ................................................. magnetic moment of proton, neutron, electron ................................ Bohr magneton ............................................................... Planck constant (~ - b / 2 ~ ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . orbital angular momentum quantum number ..................................... spin quantum number ......................................................... total angular momentum quantum number ....................................... magnetic quantum number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nuclear spin quantum number ................................................. quadrupole moment ........................................................... Bohr radius: a 0 = ~ 2 / m e 2 . . . . . . . ........... ................................ . f i n e s t r u c t u r e c o n s t a n t : ~ m e2/;/jc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . nuclear radius: R = reAl~3 ................................................. n u c l e a r magneton . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . g-factor: e . g . g = p~/I~N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Larmor ( a n g u l a r ) f r e q u e n c y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . level width ................................................................. mean life ......... reaction energy ............................................................. cross section ............................................................... internal conversion coefficient ............................................. disintegration energy ....................................................... half life ................................................................... decay constant, disintegration constant .................................... electron radius: re , e 2 / m c 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

n p d t ~

pion muon electron neutrino photon

~ ~ e u ~

N

e m,m e

mp,m n MN,M Ma,M m ~p,~n'~e /~ b

L,l~ S, J,i~ M, m i

I Q a0

R

~N g ~L P

Q

Q TI/2 re

Prefixes

Symbols for P a r t i c l e s and Quanta neutron proton deuteron triton -particle

Z A

tera giga mega kilo deci centi

(= (= (= ((= (-

1012) 10 9) 10 6) i0 S) I0 -I) 10 -2 )

T 0 M k d c

milli micro nano pico femto atto

(= (= (= (= (= (-

10 -3) 10 -6) 10-9) 10 -12) 10 -15 ) I0 "Is)

m

n p f a