Tin-125m

Properties and data of the isotope ^125mSn.

Contents

See also: List of individual Tin isotopes (and general data sources).

General data

Name of the isotope:Tin-125m; Sn-125mSymbol:^125mSn or 125m50SnMass number A:125 (= number of nucleons)Atomic number Z:50 (= number of protons)Neutrons N:75Isotopic mass:124.9077864(11) u (atomic weight of Tin-125m)
Excitation energy: 27.50(14) keVNuclide mass:124.880359 u (calculated nuclear mass without electrons)Mass excess:-85.89642 MeVMass defect:1.1333339 u (per nucleus)Nuclear binding energy:1055.69372785 MeV (per nucleus)
8.44554982 MeV (average binding energy per nucleon)Half-life:9.52(5) minDecay constant λ:0.0012134929631652 s^-1Specific activity α:5.893407707034 × 10⁺¹⁸ Bq g^-1
159281289.37931 Ci g^-1Spin and parity:
(nuclear angular momentum)3/2+Magnetic dipole moment:μ(μ_N) = + 0.763(3)Quadrupole moment Q:+ 70.9(7) barn (100 fm²)Nuclear g-factor:g_l = 0.50866666666667

Radioactive Decay

Half-life T_½ = 9.52(5) min (minutes) respectively 5.712 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹²⁵Sb	100 %

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
¹²⁵Sn		9.64(3) d	11/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 75) and isobaric (same nucleon number A = 125) with Tin-125m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 75	Isobar A = 125
42	¹¹⁷Mo
43	¹¹⁸Tc
44	¹¹⁹Ru
45	¹²⁰Rh	¹²⁵Rh
46	¹²¹Pd	¹²⁵Pd
47	¹²²Ag	¹²⁵Ag
48	¹²³Cd	¹²⁵Cd
49	¹²⁴In	¹²⁵In
50	¹²⁵Sn	¹²⁵Sn
51	¹²⁶Sb	¹²⁵Sb
52	¹²⁷Te	¹²⁵Te
53	¹²⁸I	¹²⁵I
54	¹²⁹Xe	¹²⁵Xe
55	¹³⁰Cs	¹²⁵Cs
56	¹³¹Ba	¹²⁵Ba
57	¹³²La	¹²⁵La
58	¹³³Ce	¹²⁵Ce
59	¹³⁴Pr	¹²⁵Pr
60	¹³⁵Nd	¹²⁵Nd
61	¹³⁶Pm
62	¹³⁷Sm
63	¹³⁸Eu
64	¹³⁹Gd
65	¹⁴⁰Tb
66	¹⁴¹Dy
67	¹⁴²Ho
68	¹⁴³Er
69	¹⁴⁴Tm