Dysprosium-161

Properties and data of the isotope ¹⁶¹Dy.

Contents

General Data

Parent Nuclides

NMR Data

Isotones und Isobares

See also: List of individual Dysprosium isotopes (and general data sources).

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:95Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4393939393939 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic 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:S_N = 6.45439(8) MeV (first neutron)
S_P = 7.5080(11) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)5/2+Magnetic dipole moment:μ(μ_N) = - 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 m_a	Quantity	Half-life	Spin
Dysprosium Isotopic mixture	162.500 u	100 %
Isotope ¹⁵⁶Dy	155.92428(2) u	0.056(3) %	stable	0+
Isotope ¹⁵⁸Dy	157.92442(2) u	0.095(3) %	stable	0+
Isotope ¹⁶⁰Dy	159.92520(2) u	2.329(18) %	stable	0+
Isotope ¹⁶¹Dy	160.92694(2) u	18.889(42) %	stable	5/2+
Isotope ¹⁶²Dy	161.92681(2) u	25.475(36) %	stable	0+
Isotope ¹⁶³Dy	162.92874(2) u	24.896(42) %	stable	5/2-
Isotope ¹⁶⁴Dy	163.92918(2) u	28.260(54) %	stable	0+

NMR data

Nuclear magnetic properties and parameters of the NMR active Nuclide ¹⁶¹Dy

Isotope:¹⁶¹Dy-NMRQuantity:18.889(42) %Spin:5/2+Nuclearmagnetic moment
μ/μ_N:- 0.480(3)Gyromagnetic ratio γ:0.9206 · 10⁷ rad T^-1 s^-1
1.46518 MHz T^-1Nuclear g-factor:g_l = -0.192Quadrupole moment Q:+2.507 barn (100 fm²)Line width parameter (factor):l = 20112.16 fm⁴Resonance frequency:v₀ = 1.4654 MHz at 1 TRelative Sensitivity:[related to ¹H = 1.000]:
0.00048 (H₀ = const.)
0.4015 (v₀ = const.)

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.

Z	Isotone N = 95	Isobar A = 161
55	¹⁵⁰Cs
56	¹⁵¹Ba
57	¹⁵²La
58	¹⁵³Ce
59	¹⁵⁴Pr
60	¹⁵⁵Nd	¹⁶¹Nd
61	¹⁵⁶Pm	¹⁶¹Pm
62	¹⁵⁷Sm	¹⁶¹Sm
63	¹⁵⁸Eu	¹⁶¹Eu
64	¹⁵⁹Gd	¹⁶¹Gd
65	¹⁶⁰Tb	¹⁶¹Tb
66	¹⁶¹Dy	¹⁶¹Dy
67	¹⁶²Ho	¹⁶¹Ho
68	¹⁶³Er	¹⁶¹Er
69	¹⁶⁴Tm	¹⁶¹Tm
70	¹⁶⁵Yb	¹⁶¹Yb
71	¹⁶⁶Lu	¹⁶¹Lu
72	¹⁶⁷Hf	¹⁶¹Hf
73	¹⁶⁸Ta	¹⁶¹Ta
74	¹⁶⁹W	¹⁶¹W
75	¹⁷⁰Re	¹⁶¹Re
76	¹⁷¹Os	¹⁶¹Os
77	¹⁷²Ir
78	¹⁷³Pt
79	¹⁷⁴Au
80	¹⁷⁵Hg
81	¹⁷⁶Tl