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Samarium-136m

Properties and data of the isotope 136Sm.


Content

See also: list of Samarium isotopes.

 

General data

Name of the isotope:Samarium-136m; Sm-136mSymbol:136Sm or 13662SmMass number A:136 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:74Isotopic mass:135.928276(13) u (atomic weight of Samarium-136m)
Excitation energy: 2264.7(11) keV
Nuclide mass:135.8942667 u (calculated nuclear mass without electrons)Mass excess:-66.81048 MeVMass defect:1.198079768 u (per nucleus)Nuclear binding energy:1116.00411541 MeV (per nucleus)
8.20591261 MeV (average binding energy per nucleon)
Half-life:15(1) μsDecay constant λ:46.20981203733 s-1Specific activity α:2.061348127407 × 10+23 Bq g-1
5571211155155.1 Ci g-1
Spin and parity:
(nuclear angular momentum)
(8-)

 

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear IsomerExcitation EnergyHalf-lifeSpin
136Sm47(2) s0+

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 74) and isobaric (same nucleon number A = 136) with Samarium-136m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 74Isobar A = 136
41115Nb
42116Mo
43117Tc
44118Ru
45119Rh
46120Pd
47121Ag
48122Cd
49123In136In
50124Sn136Sn
51125Sb136Sb
52126Te136Te
53127I136I
54128Xe136Xe
55129Cs136Cs
56130Ba136Ba
57131La136La
58132Ce136Ce
59133Pr136Pr
60134Nd136Nd
61135Pm136Pm
62136Sm136Sm
63137Eu136Eu
64138Gd136Gd
65139Tb136Tb
66140Dy
67141Ho

 

External data and identifiers

Adopted Levels, Gammas:NuDat 136Sm

 


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Last update: 2020-10-20


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