Strontium-104

Properties and data of the isotope ¹⁰⁴Sr.

Contents

General data

Name of the isotope:Strontium-104; Sr-104Symbol:¹⁰⁴Sr or 10438SrMass number A:104 (= number of nucleons)Atomic number Z:38 (= number of protons)Neutrons N:66Isotopic mass:103.95265(32) u (atomic weight of Strontium-104)Nuclide mass:103.9318048 u (calculated nuclear mass without electrons)Mass excess:-44.10624 MeVMass defect:0.916585672 u (per nucleus)Nuclear binding energy:853.79405395 MeV (per nucleus)
8.20955821 MeV (average binding energy per nucleon)Separation energy:S_N = 4.75(36) MeV (first neutron)
S_P = 17.79(50) MeV (first proton)Half-life:53(5) msDecay constant λ:13.07824868981 s^-1Specific activity α:7.646510272943 × 10⁺²² Bq g^-1
2066624398092.9 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1997

Radioactive Decay

Half-life T_½ = 53(5) ms respectively 5.3 × 10^-2 seconds s.

Decay mode	Daughter	Decay energy
β^-	¹⁰⁴Y	9.96(50) MeV
β^-, n	¹⁰³Y	6.28(30) MeV
β^-, 2n	¹⁰²Y

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 66) and isobaric (same nucleon number A = 104) with Strontium-104. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 66	Isobar A = 104
37	¹⁰³Rb
38	¹⁰⁴Sr	¹⁰⁴Sr
39	¹⁰⁵Y	¹⁰⁴Y
40	¹⁰⁶Zr	¹⁰⁴Zr
41	¹⁰⁷Nb	¹⁰⁴Nb
42	¹⁰⁸Mo	¹⁰⁴Mo
43	¹⁰⁹Tc	¹⁰⁴Tc
44	¹¹⁰Ru	¹⁰⁴Ru
45	¹¹¹Rh	¹⁰⁴Rh
46	¹¹²Pd	¹⁰⁴Pd
47	¹¹³Ag	¹⁰⁴Ag
48	¹¹⁴Cd	¹⁰⁴Cd
49	¹¹⁵In	¹⁰⁴In
50	¹¹⁶Sn	¹⁰⁴Sn
51	¹¹⁷Sb	¹⁰⁴Sb
52	¹¹⁸Te
53	¹¹⁹I
54	¹²⁰Xe
55	¹²¹Cs
56	¹²²Ba
57	¹²³La
58	¹²⁴Ce
59	¹²⁵Pr
60	¹²⁶Nd
61	¹²⁷Pm
62	¹²⁸Sm