Silver-125

Properties and data of the isotope ¹²⁵Ag.

Content

General data

Name of the isotope:Silver-125; Ag-125Symbol:¹²⁵Ag or 12547AgMass number A:125 (= number of nucleons)Atomic number Z:47 (= number of protons)Neutrons N:78Isotopic mass:124.93073(46) u (atomic weight of Silver-125)Nuclide mass:124.9049481 u (calculated nuclear mass without electrons)Mass excess:-64.52459 MeVMass defect:1.112909952 u (per nucleus)Nuclear binding energy:1036.66894283 MeV (per nucleus)
8.29335154 MeV (average binding energy per nucleon)Separation energy:S_N = 6.39(50) MeV (first neutron)
S_P = 13.42(53) MeV (first proton)Half-life:159(8) msDecay constant λ:4.3594162299368 s^-1Specific activity α:2.117178919659 × 10⁺²² Bq g^-1
572210518826.81 Ci g^-1Spin and parity:
(nuclear angular momentum)(9/2+)Year of discovery:1994

Radioactive Decay

Half-life T_½ = 159(8) ms respectively 1.59 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁵Cd		8.83(43) MeV
β^-, n	¹²⁴Cd	?	4.11(43) MeV

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
^125mAg	1.5012(6) keV	0.491(20) μs	(17/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 125) with Silver-125. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 78	Isobar A = 125
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh	¹²⁵Rh
46	¹²⁴Pd	¹²⁵Pd
47	¹²⁵Ag	¹²⁵Ag
48	¹²⁶Cd	¹²⁵Cd
49	¹²⁷In	¹²⁵In
50	¹²⁸Sn	¹²⁵Sn
51	¹²⁹Sb	¹²⁵Sb
52	¹³⁰Te	¹²⁵Te
53	¹³¹I	¹²⁵I
54	¹³²Xe	¹²⁵Xe
55	¹³³Cs	¹²⁵Cs
56	¹³⁴Ba	¹²⁵Ba
57	¹³⁵La	¹²⁵La
58	¹³⁶Ce	¹²⁵Ce
59	¹³⁷Pr	¹²⁵Pr
60	¹³⁸Nd	¹²⁵Nd
61	¹³⁹Pm
62	¹⁴⁰Sm
63	¹⁴¹Eu
64	¹⁴²Gd
65	¹⁴³Tb
66	¹⁴⁴Dy
67	¹⁴⁵Ho
68	¹⁴⁶Er
69	¹⁴⁷Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu