Silver-123

Properties and data of the isotope ¹²³Ag.

Content

General data

Name of the isotope:Silver-123; Ag-123Symbol:¹²³Ag or 12347AgMass number A:123 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:76Isotopic mass:122.92534(3) u (atomic weight of Silver-123)Nuclide mass:122.8995581 u (calculated nuclear mass without electrons)Mass excess:-69.54534 MeVMass defect:1.10097012 u (per nucleus)Nuclear binding energy:1025.54706096 MeV (per nucleus)
8.33778098 MeV (average binding energy per nucleon)Separation energy:S_N = 6.51(5) MeV (first neutron)
S_P = 12.22(4) MeV (first proton)Half-life:298(8) msDecay constant λ:2.3259972502012 s^-1Specific activity α:1.148154350863 × 10⁺²² Bq g^-1
310311986719.92 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2+)Year of discovery:1976

Radioactive Decay

Half-life T_½ = 298(8) ms respectively 2.98 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²³Cd	99.45 %	7.87(3) MeV
β^-, n	¹²²Cd	0.55(7) %	2.99(3) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 76) and isobaric (same nucleon number A = 123) with Silver-123. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 76	Isobar A = 123
42	¹¹⁸Mo
43	¹¹⁹Tc
44	¹²⁰Ru	¹²³Ru
45	¹²¹Rh	¹²³Rh
46	¹²²Pd	¹²³Pd
47	¹²³Ag	¹²³Ag
48	¹²⁴Cd	¹²³Cd
49	¹²⁵In	¹²³In
50	¹²⁶Sn	¹²³Sn
51	¹²⁷Sb	¹²³Sb
52	¹²⁸Te	¹²³Te
53	¹²⁹I	¹²³I
54	¹³⁰Xe	¹²³Xe
55	¹³¹Cs	¹²³Cs
56	¹³²Ba	¹²³Ba
57	¹³³La	¹²³La
58	¹³⁴Ce	¹²³Ce
59	¹³⁵Pr	¹²³Pr
60	¹³⁶Nd
61	¹³⁷Pm
62	¹³⁸Sm
63	¹³⁹Eu
64	¹⁴⁰Gd
65	¹⁴¹Tb
66	¹⁴²Dy
67	¹⁴³Ho
68	¹⁴⁴Er
69	¹⁴⁵Tm