Sulfur-37

Properties and data of the isotope ³⁷S.

Contents

General data

Name of the isotope:Sulfur-37; S-37Symbol:³⁷S or 3716SMass number A:37 (= number of nucleons)Atomic number Z:16 (= number of protons)Neutrons N:21Isotopic mass:36.97112550(21) u (atomic weight of Sulfur-37)Nuclide mass:36.9623483 u (calculated nuclear mass without electrons)Mass excess:-26.89642 MeVMass defect:0.336038248 u (per nucleus)Nuclear binding energy:313.01761178 MeV (per nucleus)
8.45993545 MeV (average binding energy per nucleon)Separation energy:S_N = 4.30360(6) MeV (first neutron)
S_P = 13.934(13) MeV (first proton)Half-life:5.05(2) minDecay constant λ:0.0022876144572935 s^-1Specific activity α:3.826760137513 × 10⁺¹⁹ Bq g^-1
1034259496.6254 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-Mirror nucleus:Scandium-37Year of discovery:1945

Radioactive Decay

Half-life T_½ = 5.05(2) min (minutes) respectively 3.03 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	³⁷Cl	100 %	4.86513(20) MeV

Parent Nuclides

Direct parent isotopes are: ³⁷P, ³⁸P.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 21) and isobaric (same nucleon number A = 37) with Sulfur-37. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 21	Isobar A = 37
9	³⁰F
10	³¹Ne
11	³²Na	³⁷Na
12	³³Mg	³⁷Mg
13	³⁴Al	³⁷Al
14	³⁵Si	³⁷Si
15	³⁶P	³⁷P
16	³⁷S	³⁷S
17	³⁸Cl	³⁷Cl
18	³⁹Ar	³⁷Ar
19	⁴⁰K	³⁷K
20	⁴¹Ca	³⁷Ca
21	⁴²Sc	³⁷Sc
22	⁴³Ti
23	⁴⁴V
24	⁴⁵Cr
25	⁴⁶Mn
26	⁴⁷Fe
27	⁴⁸Co
28	⁴⁹Ni