Dysprosium-164

Properties and data of the isotope ¹⁶⁴Dy.

Contents

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

General data

Name of the isotope:Dysprosium-164; Dy-164Symbol:¹⁶⁴Dy or 16466DyMass number A:164 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:98Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4848484848485 (= neutron-proton ratio)Neutron excess (N-Z):32Isotopic mass:163.92918(2) u (atomic weight of Dysprosium-164)Nuclide mass:163.8929768 u (calculated nuclear mass without electrons)Mass excess:-65.96841 MeVMass defect:1.43643388 u (per nucleus)Nuclear binding energy:1338.02954062 MeV (per nucleus)
8.15871671 MeV (average binding energy per nucleon)Separation energy:S_N = 7.65811(7) MeV (first neutron)
S_P = 8.661(4) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.2218(106) femtometer fmYear of discovery:1934

Parent Nuclides

Direct parent isotopes are: ¹⁶⁴Ho, ¹⁶⁴Tb.

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+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 98) and isobaric (same nucleon number A = 164) with Dysprosium-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 98	Isobar A = 164
57	¹⁵⁵La
58	¹⁵⁶Ce
59	¹⁵⁷Pr
60	¹⁵⁸Nd
61	¹⁵⁹Pm
62	¹⁶⁰Sm	¹⁶⁴Sm
63	¹⁶¹Eu	¹⁶⁴Eu
64	¹⁶²Gd	¹⁶⁴Gd
65	¹⁶³Tb	¹⁶⁴Tb
66	¹⁶⁴Dy	¹⁶⁴Dy
67	¹⁶⁵Ho	¹⁶⁴Ho
68	¹⁶⁶Er	¹⁶⁴Er
69	¹⁶⁷Tm	¹⁶⁴Tm
70	¹⁶⁸Yb	¹⁶⁴Yb
71	¹⁶⁹Lu	¹⁶⁴Lu
72	¹⁷⁰Hf	¹⁶⁴Hf
73	¹⁷¹Ta	¹⁶⁴Ta
74	¹⁷²W	¹⁶⁴W
75	¹⁷³Re	¹⁶⁴Re
76	¹⁷⁴Os	¹⁶⁴Os
77	¹⁷⁵Ir	¹⁶⁴Ir
78	¹⁷⁶Pt
79	¹⁷⁷Au
80	¹⁷⁸Hg
81	¹⁷⁹Tl
82	¹⁸⁰Pb