Strontium-101

Properties and data of the isotope ¹⁰¹Sr.

Contents

General data

Name of the isotope:Strontium-101; Sr-101Symbol:¹⁰¹Sr or 10138SrMass number A:101 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:63Isotopic mass:100.940606(9) u (atomic weight of Strontium-101)Nuclide mass:100.9197608 u (calculated nuclear mass without electrons)Mass excess:-55.32515 MeVMass defect:0.902634924 u (per nucleus)Nuclear binding energy:840.7990159 MeV (per nucleus)
8.32474273 MeV (average binding energy per nucleon)Separation energy:S_N = 3.575(11) MeV (first neutron)
S_P = 16.367(21) MeV (first proton)Half-life:118(3) msDecay constant λ:5.8741286488131 s^-1Specific activity α:3.537483015254 × 10⁺²² Bq g^-1
956076490609.24 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-)Year of discovery:1983

Radioactive Decay

Half-life T_½ = 118(3) ms respectively 1.18 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁰¹Y	97.63 %	9.736(11) MeV
β^-, n	¹⁰⁰Y	2.37(14) %	3.931(14) MeV

Parent Nuclides

Direct parent isotope is: ¹⁰¹Rb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 63) and isobaric (same nucleon number A = 101) with Strontium-101. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 63	Isobar A = 101
35	⁹⁸Br
36	⁹⁹Kr	¹⁰¹Kr
37	¹⁰⁰Rb	¹⁰¹Rb
38	¹⁰¹Sr	¹⁰¹Sr
39	¹⁰²Y	¹⁰¹Y
40	¹⁰³Zr	¹⁰¹Zr
41	¹⁰⁴Nb	¹⁰¹Nb
42	¹⁰⁵Mo	¹⁰¹Mo
43	¹⁰⁶Tc	¹⁰¹Tc
44	¹⁰⁷Ru	¹⁰¹Ru
45	¹⁰⁸Rh	¹⁰¹Rh
46	¹⁰⁹Pd	¹⁰¹Pd
47	¹¹⁰Ag	¹⁰¹Ag
48	¹¹¹Cd	¹⁰¹Cd
49	¹¹²In	¹⁰¹In
50	¹¹³Sn	¹⁰¹Sn
51	¹¹⁴Sb
52	¹¹⁵Te
53	¹¹⁶I
54	¹¹⁷Xe
55	¹¹⁸Cs
56	¹¹⁹Ba
57	¹²⁰La
58	¹²¹Ce
59	¹²²Pr