Boron-14

Properties and data of the isotope ¹⁴B.

Content

General data

Name of the isotope:Boron-14; B-14Symbol:¹⁴B or 145BMass number A:14 (= number of nucleons)Atomic number Z:5 (= number of protons)Neutrons N:9Isotopic mass:14.025404(23) u (atomic weight of Boron-14)Nuclide mass:14.0226611 u (calculated nuclear mass without electrons)Mass excess:23.66367 MeVMass defect:0.091705404000001 u (per nucleus)Nuclear binding energy:85.42303359 MeV (per nucleus)
6.10164526 MeV (average binding energy per nucleon)Separation energy:S_N = 0.970(21) MeV (first neutron)
S_P = 17.284(24) MeV (first proton)Half-life:12.5(5) msDecay constant λ:55.451774444796 s^-1Specific activity α:2.385274261714 × 10⁺²⁴ Bq g^-1
64466871938224 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Isobaric spin: 2Magnetic dipole moment:μ(μ_N) = +1.185(5)Quadrupole moment Q:0.0297(8) barn (100 fm²)Nuclear g-factor:g_l = 0.5925Mirror nucleus:Fluorine-14Year of discovery:1966

Radioactive Decay

Half-life T_½ = 12.5(5) ms respectively 1.25 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁴C	93.9 %	20.644(21) MeV
β^-, n	¹³C	6.1(3) %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 9) and isobaric (same nucleon number A = 14) with Boron-14. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.