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Antimony-121

Properties and data of the isotope 121Sb.


Content

See also: list of Antimony isotopes.

 

General data

Name of the isotope:Antimony-121; Sb-121Symbol:121Sb or 12151SbMass number A:121 (= number of nucleons)Atomic number Z:51 (= number of protons)Neutrons N:70Isotopic mass:120.90381(2) u (atomic weight of Antimony-121)Nuclide mass:120.8758341 u (calculated nuclear mass without electrons)Mass excess:-89.60041 MeVMass defect:1.101810752 u (per nucleus)Nuclear binding energy:1026.33010462 MeV (per nucleus)
8.48206698 MeV (average binding energy per nucleon)
Separation energy:SN = 9.254(8) MeV (first neutron)
SP = 5.7909(27) MeV (first proton)
Half-life:stableSpin and parity:
(nuclear angular momentum)
5/2+Magnetic dipole moment:μ(μN) = + 3.3580(16)Charge radius:4.6802(26) femtometer fmYear of discovery:1922

 

Parent Nuclides

Direct parent isotopes are: 121Te, 121Sn.

 

Occurrence

Comparison of the natural Antimony isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

 

Atomic Mass maQuantityHalf-lifeSpin
Antimony
Isotopic mixture
121.760 u100 %
Isotope 121Sb120.90381(2) u57.21(5) %stable5/2+
Isotope 123Sb122.90421(2) u42.79(5) %stable7/2+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 121Sb

Isotope:121Sb-NMRQuantity:57.21(5) %Spin:5/2+Nuclearmagnetic moment
μ/μN:
+ 3.3580(16)Gyromagnetic ratio γ:6.4442 · 107 rad T-1 s-1Nuclear g-factor:gl = 1.3432Quadrupole moment Q:-0.543(11) barn (100 fm2)Line width parameter (factor):l = 943.52 fm4Resonance frequency:v0 = 10.2551 at 1 TRelative Sensitivity:0.16302 (H0 = const.)
2.8101 (v0 = const.)
[related to 1H = 1.000]

 

Nuclear Isomers

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

Nuclear IsomerExcitation EnergyHalf-lifeSpin
121mSb2721.5+x keV179(6) μs(25/2)

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 70) and isobaric (same nucleon number A = 121) with Antimony-121. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

OZIsotone N = 70Isobar A = 121
39109Y
40110Zr
41111Nb
42112Mo
43113Tc121Tc
44114Ru121Ru
45115Rh121Rh
46116Pd121Pd
47117Ag121Ag
48118Cd121Cd
49119In121In
50120Sn121Sn
51121Sb121Sb
52122Te121Te
53123I121I
54124Xe121Xe
55125Cs121Cs
56126Ba121Ba
57127La121La
58128Ce121Ce
59129Pr121Pr
60130Nd
61131Pm
62132Sm
63133Eu
64134Gd
65135Tb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 121Sb

 


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Last update: 2020-10-17


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