Calcium-36

Properties and data of the isotope ³⁶Ca.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

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

General data

Name of the isotope:Calcium-36; Ca-36Symbol:³⁶Ca or 3620CaMass number A:36 (= number of nucleons)Atomic number Z:20 (= number of protons)Neutrons N:16Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):0.8 (= neutron-proton ratio)Neutron excess (N-Z):-4Isotopic mass:35.99307(4) u (atomic weight of Calcium-36)Nuclide mass:35.9820986 u (calculated nuclear mass without electrons)Mass excess:-6.45525 MeVMass defect:0.302069296 u (per nucleus)Nuclear binding energy:281.37573681 MeV (per nucleus)
7.81599269 MeV (average binding energy per nucleon)Separation energy:S_N = 19.31(20) MeV (first neutron)
S_P = 2.57(4) MeV (first proton)Half-life:101.2(20) msDecay constant λ:6.8492804403157 s^-1Specific activity α:1.17849518859 × 10⁺²³ Bq g^-1
3185122131335.1 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Mirror nucleus:Sulfur-36Year of discovery:1977

Radioactive Decay

Half-life T_½ = 101.2(20) ms respectively 1.012 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β⁺	³⁶K	48.8 %	10.987 MeV
EC, p	³⁵Ar	51.2(10) %	9.319 MeV

Parent Nuclides

Direct parent isotope is: ³⁸Ti.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 16) and isobaric (same nucleon number A = 36) with Calcium-36. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 16	Isobar A = 36
5	²¹B
6	²²C
7	²³N
8	²⁴O
9	²⁵F
10	²⁶Ne
11	²⁷Na	³⁶Na
12	²⁸Mg	³⁶Mg
13	²⁹Al	³⁶Al
14	³⁰Si	³⁶Si
15	³¹P	³⁶P
16	³²S	³⁶S
17	³³Cl	³⁶Cl
18	³⁴Ar	³⁶Ar
19	³⁵K	³⁶K
20	³⁶Ca	³⁶Ca
21	³⁷Sc	³⁶Sc
22	³⁸Ti