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Samarium-149

Properties and data of the isotope 149Sm.

Content
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Samarium isotopes.

 

General data

Name of the isotope:Samarium-149; Sm-149Symbol:149Sm or 14962SmMass number A:149 (= number of nucleons)Atomic number Z:62 (= number of protons)Neutrons N:87Isotopic mass:148.91719(2) u (atomic weight of Samarium-149)Nuclide mass:148.8831807 u (calculated nuclear mass without electrons)Mass excess:-77.13702 MeVMass defect:1.321809676 u (per nucleus)Nuclear binding energy:1231.25778234 MeV (per nucleus)
8.26347505 MeV (average binding energy per nucleon)Separation energy:SN = 5.8707(9) MeV (first neutron)
SP = 7.559(6) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μN) = - 0.6718Charge radius:5.0134(35) femtometer fmYear of discovery:1933

 

Parent Nuclides

Direct parent isotopes are: 149Eu, 149Pm.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Samarium
Isotopic mixture		150.36 u100 %
Isotope 144Sm143.91201(2) u3.08(4) %stable0+
Isotope 148Sm147.91483(2) u11.25(9) %7(3)×1015 a0+
Isotope 149Sm148.91719(2) u13.82(10) %stable7/2-
Isotope 150Sm149.91728(2) u7.37(9) %stable0+
Isotope 152Sm151.91974(2) u26.74(9) %stable0+
Isotope 154Sm153.92222(2) u22.74(14) %stable0+
Isotope 147Sm146.91490(2) u15.00(14) %1.0625(38) × 1011 a7/2-
Isotope 146Sm145.913047(3) u
[trace]		9.20 (26) × 107 a0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 149Sm

Isotope:149Sm-NMRQuantity:13.82(10) %Spin:7/2-Nuclearmagnetic moment
μ/μN:- 0.6718Gyromagnetic ratio γ:0.9175 · 107 rad T-1 s-1Nuclear g-factor:gl = -0.19194285714286Quadrupole moment Q:+ 0.75(7) barn (100 fm2)Resonance frequency:v0 = 1.4631 at 1 TRelative Sensitivity:0.00085 (H0 = const.)
0.7216 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 149) with Samarium-149. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 87Isobar A = 149
49136In
50137Sn
51138Sb
52139Te
53140I
54141Xe
55142Cs149Cs
56143Ba149Ba
57144La149La
58145Ce149Ce
59146Pr149Pr
60147Nd149Nd
61148Pm149Pm
62149Sm149Sm
63150Eu149Eu
64151Gd149Gd
65152Tb149Tb
66153Dy149Dy
67154Ho149Ho
68155Er149Er
69156Tm149Tm
70157Yb149Yb
71158Lu149Lu
72159Hf
73160Ta
74161W
75162Re
76163Os
77164Ir

 

External data and identifiers

Adopted Levels, Gammas:NuDat 149Sm

 

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Last update: 2020-10-20

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