Strontium-86

Properties and data of the isotope ⁸⁶Sr.

Contents

General data

Name of the isotope:Strontium-86; Sr-86Symbol:⁸⁶Sr or 8638SrMass number A:86 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:48Isotopic mass:85.909261(8) u (atomic weight of Strontium-86)Nuclide mass:85.8884158 u (calculated nuclear mass without electrons)Mass excess:-84.52283 MeVMass defect:0.804006184 u (per nucleus)Nuclear binding energy:748.92693636 MeV (per nucleus)
8.70845275 MeV (average binding energy per nucleon)Separation energy:S_N = 11.4911(28) MeV (first neutron)
S_P = 9.64473(1) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:4.2307(20) femtometer fmYear of discovery:1931

Parent Nuclides

Direct parent isotopes are: ⁸⁶Y, ⁸⁶Rb.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Strontium Isotopic mixture	87.62 u	100 %
Isotope ⁸⁴Sr	83.913419(8) u	0.57 % [0.55 - 0.58 %]	stable	0+
Isotope ⁸⁶Sr	85.909261(8) u	9.87 % [9.75 - 9.99 %]	stable	0+
Isotope ⁸⁸Sr	87.905613(8) u	82.52 % [82.29 - 82.75 %]	stable	0+
Isotope ⁸⁷Sr	86.908878(8) u	7.00(20) % [6.94 - 7.14 %]	stable	9/2+

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^86mSr	2955.68(21) keV	455(7) ns	8+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 48) and isobaric (same nucleon number A = 86) with Strontium-86. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 48	Isobar A = 86
26	⁷⁴Fe
27	⁷⁵Co
28	⁷⁶Ni
29	⁷⁷Cu
30	⁷⁸Zn
31	⁷⁹Ga	⁸⁶Ga
32	⁸⁰Ge	⁸⁶Ge
33	⁸¹As	⁸⁶As
34	⁸²Se	⁸⁶Se
35	⁸³Br	⁸⁶Br
36	⁸⁴Kr	⁸⁶Kr
37	⁸⁵Rb	⁸⁶Rb
38	⁸⁶Sr	⁸⁶Sr
39	⁸⁷Y	⁸⁶Y
40	⁸⁸Zr	⁸⁶Zr
41	⁸⁹Nb	⁸⁶Nb
42	⁹⁰Mo	⁸⁶Mo
43	⁹¹Tc	⁸⁶Tc
44	⁹²Ru	⁸⁶Ru
45	⁹³Rh
46	⁹⁴Pd
47	⁹⁵Ag
48	⁹⁶Cd
49	⁹⁷In