Sulfur-35

Properties and data of the isotope ³⁵S.

Contents

General Data

Radioactive Decay

Parent Nuclides

NMR Data

Isotones und Isobares

Literature

Sulfur-35 is a radioisotope of the chemical element sulfur, which has 19 neutrons in its atomic nucleus in addition to the element-specific 16 protons; the sum of the number of these atomic nucleus building blocks results in a mass number of 35. The short-lived, unstable and thus radioactive nuclide has no practical significance; the study of ³⁵S is exclusively for academic purposes and experimental research.

See also: List of individual Sulfur isotopes (and general data sources).

General data

Name of the isotope:Sulfur-35; S-35Symbol:³⁵S or 3516SMass number A:35 (= number of nucleons)Atomic number Z:16 (= number of protons)Neutrons N:19Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.1875 (= neutron-proton ratio)Neutron excess (N-Z):3Isotopic mass:34.96903232(4) u (atomic weight of Sulfur-35)Nuclide mass:34.9602552 u (calculated nuclear mass without electrons)Mass excess:-28.84621 MeVMass defect:0.320801596 u (per nucleus)Nuclear binding energy:298.82476186 MeV (per nucleus)
8.53785034 MeV (average binding energy per nucleon)Separation energy:S_N = 6.98584(4) MeV (first neutron)
S_P = 11.5865(8) MeV (first proton)Half-life:87.37(4) dDecay constant λ:9.182255707950 × 10^-8 s^-1Specific activity α:1.626377567212 × 10⁺¹⁵ Bq g^-1
43956.150465211 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = +1.00(4)Mirror nucleus:Potassium-35Year of discovery:1936

Radioactive Decay

Half-life T_½ = 87.37(4) d respectively 7.548768 × 10⁶ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	³⁵Cl	100 %	0.167322(26) MeV

Parent Nuclides

Direct parent isotope is: ³⁵P.

Occurrence

Comparison of the natural Sulfur isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Sulfur Isotopic mixture	32.06 u	100 %
Isotope ³²S	31.9720711735(14) u	94.9 % [94.41 - 95.29 %]	stable	0+
Isotope ³⁴S	33.96786701(5) u	4.3 % [3.96 - 4.77 %]	stable	0+
Isotope ³⁵S	34.96903232(4) u	[trace]	87.37(4) d	3/2+
Isotope ³⁶S	35.96708069(20) u	0.01 % [0.0129 - 0.0187]	stable	0+
Isotope ³³S	32.9714589086(14) u	0.7 % [0.729 - 0.797 %]	stable	3/2+

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ³⁵S

Isotope:³⁵S-NMRQuantity:SpurenSpin:3/2+Nuclearmagnetic moment
μ/μ_N:+1.00(4)Nuclear g-factor:g_l = 0.66666666666667Quadrupole moment Q:+ 0.0483(3) barn (100 fm²)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 19) and isobaric (same nucleon number A = 35) with Sulfur-35. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 19	Isobar A = 35
8	²⁷O
9	²⁸F
10	²⁹Ne
11	³⁰Na	³⁵Na
12	³¹Mg	³⁵Mg
13	³²Al	³⁵Al
14	³³Si	³⁵Si
15	³⁴P	³⁵P
16	³⁵S	³⁵S
17	³⁶Cl	³⁵Cl
18	³⁷Ar	³⁵Ar
19	³⁸K	³⁵K
20	³⁹Ca	³⁵Ca
21	⁴⁰Sc
22	⁴¹Ti
23	⁴²V
24	⁴³Cr
25	⁴⁴Mn
26	⁴⁵Fe
27	⁴⁶Co