Dysprosium-156

Properties and data of the isotope ¹⁵⁶Dy.

Contents

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

General data

Name of the isotope:Dysprosium-156; Dy-156Symbol:¹⁵⁶Dy or 15666DyMass number A:156 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:90Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.3636363636364 (= neutron-proton ratio)Neutron excess (N-Z):24Isotopic mass:155.92428(2) u (atomic weight of Dysprosium-156)Nuclide mass:155.8880768 u (calculated nuclear mass without electrons)Mass excess:-70.53273 MeVMass defect:1.372014552 u (per nucleus)Nuclear binding energy:1278.0233231 MeV (per nucleus)
8.1924572 MeV (average binding energy per nucleon)Separation energy:S_N = 9.445(10) MeV (first neutron)
S_P = 6.568(10) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.1622(2869) femtometer fmYear of discovery:1948

Parent Nuclides

Direct parent isotope is: ¹⁵⁶Ho.

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 = 90) and isobaric (same nucleon number A = 156) with Dysprosium-156. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 90	Isobar A = 156
50	¹⁴⁰Sn
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe
55	¹⁴⁵Cs
56	¹⁴⁶Ba
57	¹⁴⁷La	¹⁵⁶La
58	¹⁴⁸Ce	¹⁵⁶Ce
59	¹⁴⁹Pr	¹⁵⁶Pr
60	¹⁵⁰Nd	¹⁵⁶Nd
61	¹⁵¹Pm	¹⁵⁶Pm
62	¹⁵²Sm	¹⁵⁶Sm
63	¹⁵³Eu	¹⁵⁶Eu
64	¹⁵⁴Gd	¹⁵⁶Gd
65	¹⁵⁵Tb	¹⁵⁶Tb
66	¹⁵⁶Dy	¹⁵⁶Dy
67	¹⁵⁷Ho	¹⁵⁶Ho
68	¹⁵⁸Er	¹⁵⁶Er
69	¹⁵⁹Tm	¹⁵⁶Tm
70	¹⁶⁰Yb	¹⁵⁶Yb
71	¹⁶¹Lu	¹⁵⁶Lu
72	¹⁶²Hf	¹⁵⁶Hf
73	¹⁶³Ta	¹⁵⁶Ta
74	¹⁶⁴W	¹⁵⁶W
75	¹⁶⁵Re
76	¹⁶⁶Os
77	¹⁶⁷Ir
78	¹⁶⁸Pt
80	¹⁷⁰Hg