Silver-120m

Properties and data of the isotope ¹²⁰Ag.

Content

General data

Name of the isotope:Silver-120m; Ag-120mSymbol:¹²⁰Ag or 12047AgMass number A:120 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:73Isotopic mass:119.918785(5) u (atomic weight of Silver-120m)
Excitation energy: 203.0(10) keVNuclide mass:119.8930031 u (calculated nuclear mass without electrons)Mass excess:-75.65129 MeVMass defect:1.081530372 u (per nucleus)Nuclear binding energy:1007.43905234 MeV (per nucleus)
8.39532544 MeV (average binding energy per nucleon)Half-life:0.32(4) sDecay constant λ:2.1660849392498 s^-1Specific activity α:1.096173833508 × 10⁺²² Bq g^-1
296263198245.51 Ci g^-1Spin and parity:
(nuclear angular momentum)6(-)

Radioactive Decay

Half-life T_½ = 0.32(4) s respectively 3.2 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁰Cd	ca. 63 %
Iso	¹²⁰Ag	ca. 37 %

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
¹²⁰Ag		1.23(4) s	3(+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 73) and isobaric (same nucleon number A = 120) with Silver-120m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 73	Isobar A = 120
41	¹¹⁴Nb
42	¹¹⁵Mo
43	¹¹⁶Tc	¹²⁰Tc
44	¹¹⁷Ru	¹²⁰Ru
45	¹¹⁸Rh	¹²⁰Rh
46	¹¹⁹Pd	¹²⁰Pd
47	¹²⁰Ag	¹²⁰Ag
48	¹²¹Cd	¹²⁰Cd
49	¹²²In	¹²⁰In
50	¹²³Sn	¹²⁰Sn
51	¹²⁴Sb	¹²⁰Sb
52	¹²⁵Te	¹²⁰Te
53	¹²⁶I	¹²⁰I
54	¹²⁷Xe	¹²⁰Xe
55	¹²⁸Cs	¹²⁰Cs
56	¹²⁹Ba	¹²⁰Ba
57	¹³⁰La	¹²⁰La
58	¹³¹Ce	¹²⁰Ce
59	¹³²Pr
60	¹³³Nd
61	¹³⁴Pm
62	¹³⁵Sm
63	¹³⁶Eu
64	¹³⁷Gd
65	¹³⁸Tb
66	¹³⁹Dy
67	¹⁴⁰Ho