Phosphorus-44

Properties and data of the isotope ⁴⁴P.

Content

General data

Name of the isotope:Phosphorus-44; P-44Symbol:⁴⁴P or 4415PMass number A:44 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:29Isotopic mass:44.01122(54) u (atomic weight of Phosphorus-44)Nuclide mass:44.0029914 u (calculated nuclear mass without electrons)Mass excess:10.45136 MeVMass defect:0.357438044 u (per nucleus)Nuclear binding energy:332.95139336 MeV (per nucleus)
7.56707712 MeV (average binding energy per nucleon)Separation energy:S_N = 2.30(75) MeV (first neutron)
S_P = 19.94(78) MeV (first proton)Half-life:18.5(25) msDecay constant λ:37.467415165402 s^-1Specific activity α:5.128046631449 × 10⁺²³ Bq g^-1
13859585490404 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1989

Radioactive Decay

Half-life T_½ = 18.5(25) ms respectively 1.85 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴⁴S	?	19.65(50) MeV
β^-, n	⁴³S	?	14.57(50) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 44) with Phosphorus-44. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 29	Isobar A = 44
13	⁴²Al
14	⁴³Si	⁴⁴Si
15	⁴⁴P	⁴⁴P
16	⁴⁵S	⁴⁴S
17	⁴⁶Cl	⁴⁴Cl
18	⁴⁷Ar	⁴⁴Ar
19	⁴⁸K	⁴⁴K
20	⁴⁹Ca	⁴⁴Ca
21	⁵⁰Sc	⁴⁴Sc
22	⁵¹Ti	⁴⁴Ti
23	⁵²V	⁴⁴V
24	⁵³Cr	⁴⁴Cr
25	⁵⁴Mn	⁴⁴Mn
26	⁵⁵Fe
27	⁵⁶Co
28	⁵⁷Ni
29	⁵⁸Cu
30	⁵⁹Zn
31	⁶⁰Ga
32	⁶¹Ge
33	⁶²As
34	⁶³Se