Yttrium-104

Properties and data of the isotope ¹⁰⁴Y.

Content

General data

Name of the isotope:Yttrium-104; Y-104Symbol:¹⁰⁴Y or 10439YMass number A:104 (= number of nucleons)Atomic number Z:39 (= number of protons)Neutrons N:65Isotopic mass:103.94196(43) u (atomic weight of Yttrium-104)Nuclide mass:103.9205663 u (calculated nuclear mass without electrons)Mass excess:-54.06391 MeVMass defect:0.92643578800001 u (per nucleus)Nuclear binding energy:862.96937791 MeV (per nucleus)
8.29778248 MeV (average binding energy per nucleon)Separation energy:S_N = 3.68(40) MeV (first neutron)
S_P = 13.93(45) MeV (first proton)Half-life:197(4) msDecay constant λ:3.5185136069033 s^-1Specific activity α:2.057182966832 × 10⁺²² Bq g^-1
555995396441.24 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1994

Radioactive Decay

Half-life T_½ = 197(4) ms respectively 1.97 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy
β^-	¹⁰⁴Zr	66 %	11.66(40) MeV
β^-, n	¹⁰³Zr	34(10) %	5.68(40) MeV
β^-, 2n	¹⁰²Zr	?

Parent Nuclides

Direct parent isotope is: ¹⁰⁴Sr.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 65) and isobaric (same nucleon number A = 104) with Yttrium-104. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 65	Isobar A = 104
36	¹⁰¹Kr
37	¹⁰²Rb
38	¹⁰³Sr	¹⁰⁴Sr
39	¹⁰⁴Y	¹⁰⁴Y
40	¹⁰⁵Zr	¹⁰⁴Zr
41	¹⁰⁶Nb	¹⁰⁴Nb
42	¹⁰⁷Mo	¹⁰⁴Mo
43	¹⁰⁸Tc	¹⁰⁴Tc
44	¹⁰⁹Ru	¹⁰⁴Ru
45	¹¹⁰Rh	¹⁰⁴Rh
46	¹¹¹Pd	¹⁰⁴Pd
47	¹¹²Ag	¹⁰⁴Ag
48	¹¹³Cd	¹⁰⁴Cd
49	¹¹⁴In	¹⁰⁴In
50	¹¹⁵Sn	¹⁰⁴Sn
51	¹¹⁶Sb	¹⁰⁴Sb
52	¹¹⁷Te
53	¹¹⁸I
54	¹¹⁹Xe
55	¹²⁰Cs
56	¹²¹Ba
57	¹²²La
58	¹²³Ce
59	¹²⁴Pr
60	¹²⁵Nd
61	¹²⁶Pm