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Gadolinium-157

Properties and data of the isotope 157Gd.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Gadolinium isotopes.

 

General data

Name of the isotope:Gadolinium-157; Gd-157Symbol:157Gd or 15764GdMass number A:157 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:93Isotopic mass:156.92397(2) u (atomic weight of Gadolinium-157)Nuclide mass:156.8888637 u (calculated nuclear mass without electrons)Mass excess:-70.82149 MeVMass defect:1.382669236 u (per nucleus)Nuclear binding energy:1287.94809732 MeV (per nucleus)
8.20349107 MeV (average binding energy per nucleon)Separation energy:SN = 6.35988(15) MeV (first neutron)
SP = 8.030(3) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)3/2-Magnetic dipole moment:μ(μN) = - 0.3398(7)Charge radius:5.1449(42) femtometer fmYear of discovery:1933

 

Parent Nuclides

Direct parent isotopes are: 157Tb, 157Eu.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Gadolinium
Isotopic mixture		157.25 u100 %
Isotope 152Gd151.91980(2) u0.20(3) %1.08(8) × 1014 a0+
Isotope 154Gd153.92087(2) u2.18(2) %stable0+
Isotope 155Gd154.92263(2) u14.80(9) %stable3/2-
Isotope 156Gd155.92213(2) u20.47(3) %stable0+
Isotope 157Gd156.92397(2) u15.65(4) %stable3/2-
Isotope 158Gd157.92411(2) u24.84(8) %stable0+
Isotope 160Gd159.92706(2) u21.86(3) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 157Gd

Isotope:157Gd-NMRQuantity:15.65(4) %Spin:3/2-Nuclearmagnetic moment
μ/μN:- 0.3398(7)Gyromagnetic ratio γ:1.0792 · 107 rad T-1 s-1Nuclear g-factor:gl = -0.22653333333333Quadrupole moment Q:1.35(3) barn (100 fm2)Line width parameter (factor):l = 24300 fm4Resonance frequency:v0 = 1.720 at 1 TRelative Sensitivity:0.00033 (H0 = const.)
0.2020 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 157) with Gadolinium-157. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 93Isobar A = 157
54147Xe
55148Cs
56149Ba
57150La
58151Ce157Ce
59152Pr157Pr
60153Nd157Nd
61154Pm157Pm
62155Sm157Sm
63156Eu157Eu
64157Gd157Gd
65158Tb157Tb
66159Dy157Dy
67160Ho157Ho
68161Er157Er
69162Tm157Tm
70163Yb157Yb
71164Lu157Lu
72165Hf157Hf
73166Ta157Ta
74167W157W
75168Re
76169Os
77170Ir
78171Pt
79172Au
80173Hg

 

External data and identifiers

Adopted Levels, Gammas:NuDat 157Gd

 

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Last update: 2020-10-20

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