Nitrogen-20

Properties and data of the isotope ²⁰N.

Content

General data

Name of the isotope:Nitrogen-20; N-20Symbol:²⁰N or 207NMass number A:20 (= number of nucleons)Atomic number Z:7 (= number of protons)Neutrons N:13Isotopic mass:20.02337(8) u (atomic weight of Nitrogen-20)Nuclide mass:20.01953 u (calculated nuclear mass without electrons)Mass excess:21.76901 MeVMass defect:0.144049132 u (per nucleus)Nuclear binding energy:134.18090216 MeV (per nucleus)
6.70904511 MeV (average binding energy per nucleon)Separation energy:S_N = 2.16(8) MeV (first neutron)
S_P = 17.94(13) MeV (first proton)Half-life:134.4(37) msDecay constant λ:5.157345093452 s^-1Specific activity α:1.552912930803 × 10⁺²³ Bq g^-1
4197061975144.9 Ci g^-1Spin and parity:
(nuclear angular momentum)(2-)Year of discovery:1969

Radioactive Decay

Half-life T_½ = 134.4(37) ms respectively 1.344 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	²⁰O	42.9 %	17.97(8) MeV
β^-, n	¹⁹O	57.1 %	10.36(8) MeV

Parent Nuclides

Direct parent isotope is: ²⁰C.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 13) and isobaric (same nucleon number A = 20) with Nitrogen-20. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 13	Isobar A = 20
5	¹⁸B	²⁰B
6	¹⁹C	²⁰C
7	²⁰N	²⁰N
8	²¹O	²⁰O
9	²²F	²⁰F
10	²³Ne	²⁰Ne
11	²⁴Na	²⁰Na
12	²⁵Mg	²⁰Mg
13	²⁶Al
14	²⁷Si
15	²⁸P
16	²⁹S
17	³⁰Cl
18	³¹Ar
19	³²K