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Isotopes of Nitrogen

List, data and properties of all known isotopes of Nitrogen as well as radioactive decay products and intermediate products.

 

Nitrogen isotopes

The natural nitrogen that surrounds us consists of the stable isotopes 14N (> 99.5%) and 15N (< 0.4%). The CNO cycle of stellar nucleosynthesis is assumed to be the source of the 14N-nuclide.

 

Naturally Occurring Nitrogen Isotopes

Atomic Mass maQuantityHalf-lifeSpin
Nitrogen
Isotopic mixture
14,007 u100 %
Isotope 14N14,003074004(2) u99,6205 %stable1+
Isotope 15N15,000108899(4) u0,3795 %stable1/2-

 

The atomic mass of the natural isotope mixture fluctuates between 14.00643 and 14.00728 u due to the varying isotope distribution.

Nitrogen-15 is used in NMR spectroscopy despite its small proportion of natural nitrogen and the negative gyromagnetic ratio. as the 15N NMR spectrum shows broad lines.

Investigations on 15N-labeled proteins, which can be cultivated in appropriate nitrogen-14-free media, are also common.

In addition to the stable nitrogen isotopes, 14 radioactive isotopes and the nuclear isomer 11mN are known, the longest-lived of which has a half-life of less than 10 minutes.

 

Isotope Table: Nitrogen

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
10N7103Nitrogen-1010.04165(43) u
[10.03781 u]
{38.79673 MeV}
(1-)
11N7114Nitrogen-1111.02609(5) u
[11.02225 u]
{24.30268 MeV}
1/2+
11mN7114Nitrogen-11m11.02609(5) u
[11.02225 u]
{24.30268 MeV}
1/2-
12N7125Nitrogen-1212.0186132(11) u
[12.0147732 u]
{17.33808 MeV}
1++ 0.4571(1)
13N7136Nitrogen-1313.00573861(28) u
[13.0018986 u]
{5.34548 MeV}
1/2-0.3219(4)13O
14N7147Nitrogen-1414.003074004(2) u
[13.999234 u]
{2.86342 MeV}
1++ 0.403573(2)14O
14C
15N7158Nitrogen-1515.000108899(4) u
[14.9962689 u]
{0.10144 MeV}
1/2--0.2830569(14)15O
15C
16N7169Nitrogen-1616.0061019(25) u
[16.0022619 u]
{5.68388 MeV}
2-1.9856(11)16C
16mN7169Nitrogen-16m16.0061019(25) u
[16.0022619 u]
{5.68388 MeV}
0-
17N71710Nitrogen-1717.008449(16) u
[17.004609 u]
{7.87019 MeV}
1/2-0.3552(4)17C
18N71811Nitrogen-1818.014078(20) u
[18.010238 u]
{13.11357 MeV}
1-0.3274(4)18C
19N71912Nitrogen-1919.017022(18) u
[19.013182 u]
{15.85589 MeV}
1/2-0.305(15)
20N72013Nitrogen-2020.02337(8) u
[20.01953 u]
{21.76901 MeV}
(2-)20C
21N72114Nitrogen-2121.02709(14) u
[21.02325 u]
{25.23417 MeV}
(1/2-)22C
22N72215Nitrogen-2222.03410(22) u
[22.03026 u]
{31.76395 MeV}
(0-)
23N72316Nitrogen-2323.03942(45) u
[23.03558 u]
{36.71949 MeV}
1/2-
24N72417Nitrogen-2424.05039(43) u
[24.04655 u]
{46.93798 MeV}
25N72518Nitrogen-2525.06010(54) u
[25.05626 u]
{55.98279 MeV}
1/2-

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
N-101.82 × 10-22 sp → 9C100 %23.1 MeVAL
N-11550(20) × 10-24 sp → 10C100 %1.827 MeVAL
N-11m6.9(80) × 10-22 sp → 10C100 %2.567 MeV730(70) keVAL
N-1211.000(16) msβ+12C
β+, α → 8Be
96.5 %
3.5 %
17.3381(10) MeV
AL
N-139.965(4) minβ+13C100 %2.22047(27) MeVAL
N-14stableAL
N-15stableAL
N-167.13(2) sβ-16O
β-, α → 12C
99.99 %
0.0012(5) %
10.4209(23) MeV
0.120 MeV
AL
N-16m5.25(6) μsIso 16N
β- 16O
99.9996 %
0.0004 %

120.42(12) keV
N-174.173(4) sβ-17O
β-, n → 16O
β-, α → 13C
4.9975 %
95.0 %
0.0025 %
8.679(15) MeV
4.537 MeV
AL
N-18624(12) msβ-18O
β-, n → 17O
β-, α → 14C
73.5 %
14.3 %
12.2 %
13.896(19) MeV
5.851(19) MeV
AL
N-19271(8) msβ-19O
β-, n → 18O
45.4 %
54.6 %
12.523(17) MeV
8.568(16) MeV
AL
N-20134.4(37) msβ-20O
β-, n → 19O
42.9 %
57.1 %
17.97(8) MeV
10.36(8) MeV
AL
N-2184(7) msβ-21O
β-, n → 20O
14 %
86(4) %
17.17(13) MeV
13.36(13) MeV
AL
N-2223(3) msβ-22O
β-, n → 21O
β-, 2n → 20O
54 %
34(3) %
12(3) %
22.48(22) MeV
15.63(21)
AL
N-2314.1(15) msβ-23O
β-, n → 22O
β-, 2n → 21O
β-, 3n → 20O
46.6 %
42 %
8 %
< 3.4 %
22.10(44) MeV
19.37(42) MeV

AL
N-2452 nsn → 23N?AL
N-25< 260 nsn ? → 24NAL

 

Notes (related to the columns):

1 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Nitrogen isotope.
6 - Relative atomic mass of the Nitrogen isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - Source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.
10 - Decay: Half-live of the Nitrogen isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - Other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Nitrogen nuclides

Nuclide
quantity 1)
spin
Nuclear magnetic
moment
μ/μN
Gyromagnetic
ratio
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
14N
99,6205 %
1+
+ 0,403573(2)1,93382,044(3)3,07770,00101
0,1928
15N
0,3795 %
1/2-
-0,2830569(14)- 2,7124,31730,00104
0,1014

1) Quantity Percentage of natural occurrence.

2) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Nitrogen radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
N-13109 Bq100 Bq/g0,06 TBq< 10 min

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Nitrogen nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Nitrogen: NMR properties - 14N-NMR, 15N-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 


Category: Isotopes

Last update: 05.07.2020



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