Phosphorus-32

Properties and data of the isotope ³²P.

Content

General data

Name of the isotope:Phosphorus-32; P-32Symbol:³²P or 3215PMass number A:32 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:17Isotopic mass:31.97390764(4) u (atomic weight of Phosphorus-32)Nuclide mass:31.965679 u (calculated nuclear mass without electrons)Mass excess:-24.30488 MeVMass defect:0.29077141200001 u (per nucleus)Nuclear binding energy:270.85182565 MeV (per nucleus)
8.46411955 MeV (average binding energy per nucleon)Separation energy:S_N = 7.93565(4) MeV (first neutron)
S_P = 8.64481(6) MeV (first proton)Half-life:14.268(5) dDecay constant λ:5.622747975915 × 10^-7 s^-1Specific activity α:1.092289688093 × 10⁺¹⁶ Bq g^-1
295213.42921438 Ci g^-1Spin and parity:
(nuclear angular momentum)1+Magnetic dipole moment:μ(μ_N) = - 0.2528(2)Nuclear g-factor:g_l = -0.2528Mirror nucleus:Chlorine-32Year of discovery:1934

Radioactive Decay

Half-life T_½ = 14.268(5) d respectively 1.2327552 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	³²S	100 %	1.71066(4) MeV

Parent Nuclides

Direct parent isotope is: ³²Si.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 17) and isobaric (same nucleon number A = 32) with Phosphorus-32. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 17	Isobar A = 32
7	²⁴N
8	²⁵O
9	²⁶F
10	²⁷Ne	³²Ne
11	²⁸Na	³²Na
12	²⁹Mg	³²Mg
13	³⁰Al	³²Al
14	³¹Si	³²Si
15	³²P	³²P
16	³³S	³²S
17	³⁴Cl	³²Cl
18	³⁵Ar	³²Ar
19	³⁶K	³²K
20	³⁷Ca
21	³⁸Sc
22	³⁹Ti
23	⁴⁰V
24	⁴¹Cr
25	⁴²Mn