Phosphorus-45

Properties and data of the isotope ⁴⁵P.

Content

General data

Name of the isotope:Phosphorus-45; P-45Symbol:⁴⁵P or 4515PMass number A:45 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:30Isotopic mass:45.01675(54) u (atomic weight of Phosphorus-45)Nuclide mass:45.0085214 u (calculated nuclear mass without electrons)Mass excess:15.60252 MeVMass defect:0.36057296 u (per nucleus)Nuclear binding energy:335.8715488 MeV (per nucleus)
7.4638122 MeV (average binding energy per nucleon)Separation energy:S_N = 2.92(71) MeV (first neutron)
S_P = 20.20(78) MeV (first proton)Half-life:200 nsDecay constant λ:3465735.9027997 s^-1Specific activity α:4.638033286666 × 10⁺²⁸ Bq g^-1
1.253522509909 × 10⁺¹⁸ Ci g^-1Spin and parity:
(nuclear angular momentum)1/2+Year of discovery:1990

Radioactive Decay

Half-life T_½ = 200 ns respectively 2.00 × 10^-7 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁵S	?	19.59(115) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 30) and isobaric (same nucleon number A = 45) with Phosphorus-45. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 30	Isobar A = 45
13	⁴³Al
14	⁴⁴Si
15	⁴⁵P	⁴⁵P
16	⁴⁶S	⁴⁵S
17	⁴⁷Cl	⁴⁵Cl
18	⁴⁸Ar	⁴⁵Ar
19	⁴⁹K	⁴⁵K
20	⁵⁰Ca	⁴⁵Ca
21	⁵¹Sc	⁴⁵Sc
22	⁵²Ti	⁴⁵Ti
23	⁵³V	⁴⁵V
24	⁵⁴Cr	⁴⁵Cr
25	⁵⁵Mn	⁴⁵Mn
26	⁵⁶Fe	⁴⁵Fe
27	⁵⁷Co
28	⁵⁸Ni
29	⁵⁹Cu
30	⁶⁰Zn
31	⁶¹Ga
32	⁶²Ge
33	⁶³As
34	⁶⁴Se