Phosphorus-41

Properties and data of the isotope ⁴¹P.

Content

General data

Name of the isotope:Phosphorus-41; P-41Symbol:⁴¹P or 4115PMass number A:41 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:26Isotopic mass:40.99465(13) u (atomic weight of Phosphorus-41)Nuclide mass:40.9864214 u (calculated nuclear mass without electrons)Mass excess:-4.98349 MeVMass defect:0.348013296 u (per nucleus)Nuclear binding energy:324.17229714 MeV (per nucleus)
7.90664139 MeV (average binding energy per nucleon)Separation energy:S_N = 4.94(19) MeV (first neutron)
S_P = 17.70(37) MeV (first proton)Half-life:101(5) msDecay constant λ:6.8628433718806 s^-1Specific activity α:1.033225237128 × 10⁺²³ Bq g^-1
2792500640888.4 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1979

Radioactive Decay

Half-life T_½ = 101(5) ms respectively 1.01 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁴¹S	70(10) %	14.10898 MeV
β^-, n	⁴⁰S	30(10) %	9.8793 MeV

Parent Nuclides

Direct parent isotopes are: ⁴¹Si, ⁴²Si.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 26) and isobaric (same nucleon number A = 41) with Phosphorus-41. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 26	Isobar A = 41
11	³⁷Na
12	³⁸Mg
13	³⁹Al	⁴¹Al
14	⁴⁰Si	⁴¹Si
15	⁴¹P	⁴¹P
16	⁴²S	⁴¹S
17	⁴³Cl	⁴¹Cl
18	⁴⁴Ar	⁴¹Ar
19	⁴⁵K	⁴¹K
20	⁴⁶Ca	⁴¹Ca
21	⁴⁷Sc	⁴¹Sc
22	⁴⁸Ti	⁴¹Ti
23	⁴⁹V	⁴¹V
24	⁵⁰Cr	⁴¹Cr
25	⁵¹Mn
26	⁵²Fe
27	⁵³Co
28	⁵⁴Ni
29	⁵⁵Cu
30	⁵⁶Zn