Phosphorus-29

Properties and data of the isotope ²⁹P.

Content

General data

Name of the isotope:Phosphorus-29; P-29Symbol:²⁹P or 2915PMass number A:29 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:14Isotopic mass:28.9818004(4) u (atomic weight of Phosphorus-29)Nuclide mass:28.9735718 u (calculated nuclear mass without electrons)Mass excess:-16.95282 MeVMass defect:0.256883904 u (per nucleus)Nuclear binding energy:239.28581527 MeV (per nucleus)
8.25123501 MeV (average binding energy per nucleon)Separation energy:S_N = 17.8764(12) MeV (first neutron)
S_P = 2.7490(4) MeV (first proton)Half-life:4.142(15) sDecay constant λ:0.16734601172379 s^-1Specific activity α:3.599218767676 × 10⁺²¹ Bq g^-1
97276182910.165 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Magnetic dipole moment:μ(μ_N) = 1.2344(3)Nuclear g-factor:g_l = 2.4688Mirror nucleus:Silicon-29Year of discovery:1941

Radioactive Decay

Half-life T_½ = 4.142(15) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	²⁹Si	100 %	4.94246 MeV

Parent Nuclides

Direct parent isotopes are: ²⁹S, ³¹Ar.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 14) and isobaric (same nucleon number A = 29) with Phosphorus-29. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 14	Isobar A = 29
5	¹⁹B
6	²⁰C
7	²¹N
8	²²O
9	²³F	²⁹F
10	²⁴Ne	²⁹Ne
11	²⁵Na	²⁹Na
12	²⁶Mg	²⁹Mg
13	²⁷Al	²⁹Al
14	²⁸Si	²⁹Si
15	²⁹P	²⁹P
16	³⁰S	²⁹S
17	³¹Cl	²⁹Cl
18	³²Ar
19	³³K
20	³⁴Ca