Nitrogen-19

Properties and data of the isotope ¹⁹N.

Content

General data

Name of the isotope:Nitrogen-19; N-19Symbol:¹⁹N or 197NMass number A:19 (= number of nucleons)Atomic number Z:7 (= number of protons)Neutrons N:12Isotopic mass:19.017022(18) u (atomic weight of Nitrogen-19)Nuclide mass:19.013182 u (calculated nuclear mass without electrons)Mass excess:15.85589 MeVMass defect:0.141732216 u (per nucleus)Nuclear binding energy:132.02270881 MeV (per nucleus)
6.94856362 MeV (average binding energy per nucleon)Separation energy:S_N = 5.328(25) MeV (first neutron)
S_P = 16.35(3) MeV (first proton)Half-life:271(8) msDecay constant λ:2.5577386736529 s^-1Specific activity α:8.106875039813 × 10⁺²² Bq g^-1
2191047308057.7 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = 0.305(15)Nuclear g-factor:g_l = 0.61Mirror nucleus:Magnesium-19Year of discovery:1968

Radioactive Decay

Half-life T_½ = 271(8) ms respectively 2.71 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁹O	45.4 %	12.523(17) MeV
β^-, n	¹⁸O	54.6 %	8.568(16) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 12) and isobaric (same nucleon number A = 19) with Nitrogen-19. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 12	Isobar A = 19
4	¹⁶Be
5	¹⁷B	¹⁹B
6	¹⁸C	¹⁹C
7	¹⁹N	¹⁹N
8	²⁰O	¹⁹O
9	²¹F	¹⁹F
10	²²Ne	¹⁹Ne
11	²³Na	¹⁹Na
12	²⁴Mg	¹⁹Mg
13	²⁵Al
14	²⁶Si
15	²⁷P
16	²⁸S
17	²⁹Cl
18	³⁰Ar