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Dysprosium-161

Properties and data of the isotope 161Dy.

Contents
General Data
Parent Nuclides
NMR Data
Isotones und Isobares

See also: list of Dysprosium isotopes.

 

General data

Name of the isotope:Dysprosium-161; Dy-161Symbol:161Dy or 16166DyMass number A:161 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:95Isotopic mass:160.92694(2) u (atomic weight of Dysprosium-161)Nuclide mass:160.8907368 u (calculated nuclear mass without electrons)Mass excess:-68.05495 MeVMass defect:1.412679132 u (per nucleus)Nuclear binding energy:1315.90213538 MeV (per nucleus)
8.17330519 MeV (average binding energy per nucleon)Separation energy:SN = 6.45439(8) MeV (first neutron)
SP = 7.5080(11) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μN) = - 0.480(3)Charge radius:5.1962(459) femtometer fmYear of discovery:1934

 

Parent Nuclides

Direct parent isotopes are: 161Ho, 161Tb.

 

Occurrence

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

 

Atomic Mass maQuantityHalf-lifeSpin
Dysprosium
Isotopic mixture		162.500 u100 %
Isotope 156Dy155.92428(2) u0.056(3) %stable0+
Isotope 158Dy157.92442(2) u0.095(3) %stable0+
Isotope 160Dy159.92520(2) u2.329(18) %stable0+
Isotope 161Dy160.92694(2) u18.889(42) %stable5/2+
Isotope 162Dy161.92681(2) u25.475(36) %stable0+
Isotope 163Dy162.92874(2) u24.896(42) %stable5/2-
Isotope 164Dy163.92918(2) u28.260(54) %stable0+

 

NMR data

Nuclear magnetic properties of the NMR active Nuclide 161Dy

Isotope:161Dy-NMRQuantity:18.889(42) %Spin:5/2+Nuclearmagnetic moment
μ/μN:- 0.480(3)Gyromagnetic ratio γ:0.9206 · 107 rad T-1 s-1Nuclear g-factor:gl = -0.192Quadrupole moment Q:+2.507 barn (100 fm2)Line width parameter (factor):l = 20112.16 fm4Resonance frequency:v0 = 1.4654 at 1 TRelative Sensitivity:0.00048 (H0 = const.)
0.4015 (v0 = const.)
[related to 1H = 1.000]

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 95) and isobaric (same nucleon number A = 161) with Dysprosium-161. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 95Isobar A = 161
55150Cs
56151Ba
57152La
58153Ce
59154Pr
60155Nd161Nd
61156Pm161Pm
62157Sm161Sm
63158Eu161Eu
64159Gd161Gd
65160Tb161Tb
66161Dy161Dy
67162Ho161Ho
68163Er161Er
69164Tm161Tm
70165Yb161Yb
71166Lu161Lu
72167Hf161Hf
73168Ta161Ta
74169W161W
75170Re161Re
76171Os161Os
77172Ir
78173Pt
79174Au
80175Hg
81176Tl

 

External data and identifiers

Adopted Levels, Gammas:NuDat 161Dy

 

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Last update: 2023-05-20

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