Boron-15

Properties and data of the isotope ¹⁵B.

Content

General data

Name of the isotope:Boron-15; B-15Symbol:¹⁵B or 155BMass number A:15 (= number of nucleons)Atomic number Z:5 (= number of protons)Neutrons N:10Isotopic mass:15.031088(23) u (atomic weight of Boron-15)Nuclide mass:15.0283451 u (calculated nuclear mass without electrons)Mass excess:28.95829 MeVMass defect:0.094686319999999 u (per nucleus)Nuclear binding energy:88.19973896 MeV (per nucleus)
5.8799826 MeV (average binding energy per nucleon)Separation energy:S_N = 2.78(3) MeV (first neutron)
S_P = 18.29(13) MeV (first proton)Half-life:9.93(7) msDecay constant λ:69.803341446117 s^-1Specific activity α:2.802437031218 × 10⁺²⁴ Bq g^-1
75741541384284 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μ_N) = +2.659(15)Quadrupole moment Q:0.0379(11) barn (100 fm²)Nuclear g-factor:g_l = 1.7726666666667Mirror nucleus:Neon-15Year of discovery:1966

Radioactive Decay

Half-life T_½ = 9.93(7) ms respectively 9.93 × 10^-3 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹⁵C	6 %	19.085(21) MeV
β^-, n	¹⁴C	93.6 %
β^-, 2n	¹³C	0.4 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 10) and isobaric (same nucleon number A = 15) with Boron-15. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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