Phosphorus-37

Properties and data of the isotope ³⁷P.

Content

General data

Name of the isotope:Phosphorus-37; P-37Symbol:³⁷P or 3715PMass number A:37 (= number of nucleons)Atomic number Z:15 (= number of protons)Neutrons N:22Isotopic mass:36.97961(4) u (atomic weight of Phosphorus-37)Nuclide mass:36.9713814 u (calculated nuclear mass without electrons)Mass excess:-18.99316 MeVMass defect:0.328393632 u (per nucleus)Nuclear binding energy:305.89669785 MeV (per nucleus)
8.26747832 MeV (average binding energy per nucleon)Separation energy:S_N = 6.816(40) MeV (first neutron)
S_P = 13.849(81) MeV (first proton)Half-life:2.31(13) sDecay constant λ:0.30006371452811 s^-1Specific activity α:5.019516544011 × 10⁺²¹ Bq g^-1
135662609297.61 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1971

Radioactive Decay

Half-life T_½ = 2.31(13) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	³⁷S	100 %	7.90(4) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 22) and isobaric (same nucleon number A = 37) with Phosphorus-37. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 22	Isobar A = 37
9	³¹F
10	³²Ne
11	³³Na	³⁷Na
12	³⁴Mg	³⁷Mg
13	³⁵Al	³⁷Al
14	³⁶Si	³⁷Si
15	³⁷P	³⁷P
16	³⁸S	³⁷S
17	³⁹Cl	³⁷Cl
18	⁴⁰Ar	³⁷Ar
19	⁴¹K	³⁷K
20	⁴²Ca	³⁷Ca
21	⁴³Sc	³⁷Sc
22	⁴⁴Ti
23	⁴⁵V
24	⁴⁶Cr
25	⁴⁷Mn
26	⁴⁸Fe
27	⁴⁹Co
28	⁵⁰Ni