Dysprosium-158

Properties and data of the isotope ¹⁵⁸Dy.

Contents

General data

Name of the isotope:Dysprosium-158; Dy-158Symbol:¹⁵⁸Dy or 15866DyMass number A:158 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:92Isotopic mass:157.92442(2) u (atomic weight of Dysprosium-158)Nuclide mass:157.8882168 u (calculated nuclear mass without electrons)Mass excess:-70.40232 MeVMass defect:1.389204384 u (per nucleus)Nuclear binding energy:1294.03554847 MeV (per nucleus)
8.19009841 MeV (average binding energy per nucleon)Separation energy:S_N = 9.054(5) MeV (first neutron)
S_P = 6.9329(24) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.1815(3023) femtometer fmYear of discovery:1938

Parent Nuclides

Direct parent isotopes are: ¹⁵⁸Ho, ¹⁵⁸Tb.

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 = 92) and isobaric (same nucleon number A = 158) with Dysprosium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 92	Isobar A = 158
53	¹⁴⁵I
54	¹⁴⁶Xe
55	¹⁴⁷Cs
56	¹⁴⁸Ba
57	¹⁴⁹La
58	¹⁵⁰Ce	¹⁵⁸Ce
59	¹⁵¹Pr	¹⁵⁸Pr
60	¹⁵²Nd	¹⁵⁸Nd
61	¹⁵³Pm	¹⁵⁸Pm
62	¹⁵⁴Sm	¹⁵⁸Sm
63	¹⁵⁵Eu	¹⁵⁸Eu
64	¹⁵⁶Gd	¹⁵⁸Gd
65	¹⁵⁷Tb	¹⁵⁸Tb
66	¹⁵⁸Dy	¹⁵⁸Dy
67	¹⁵⁹Ho	¹⁵⁸Ho
68	¹⁶⁰Er	¹⁵⁸Er
69	¹⁶¹Tm	¹⁵⁸Tm
70	¹⁶²Yb	¹⁵⁸Yb
71	¹⁶³Lu	¹⁵⁸Lu
72	¹⁶⁴Hf	¹⁵⁸Hf
73	¹⁶⁵Ta	¹⁵⁸Ta
74	¹⁶⁶W	¹⁵⁸W
75	¹⁶⁷Re
76	¹⁶⁸Os
77	¹⁶⁹Ir
78	¹⁷⁰Pt
79	¹⁷¹Au
80	¹⁷²Hg