Gadolinium-158

Properties and data of the isotope ¹⁵⁸Gd.

Contents

General data

Name of the isotope:Gadolinium-158; Gd-158Symbol:¹⁵⁸Gd or 15864GdMass number A:158 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:94Isotopic mass:157.92411(2) u (atomic weight of Gadolinium-158)Nuclide mass:157.8890037 u (calculated nuclear mass without electrons)Mass excess:-70.69108 MeVMass defect:1.391194152 u (per nucleus)Nuclear binding energy:1295.88900542 MeV (per nucleus)
8.20182915 MeV (average binding energy per nucleon)Separation energy:S_N = 7.93739(6) MeV (first neutron)
S_P = 8.520(4) MeV (first proton)Half-life:stableSpin and parity:
(nuclear angular momentum)0+Charge radius:5.1569(43) femtometer fmYear of discovery:1933

Parent Nuclides

Direct parent isotopes are: ¹⁵⁸Tb, ¹⁵⁸Eu.

Occurrence

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

	Atomic Mass m_a	Quantity	Half-life	Spin
Gadolinium Isotopic mixture	157.25 u	100 %
Isotope ¹⁵²Gd	151.91980(2) u	0.20(3) %	1.08(8) × 10¹⁴ a	0+
Isotope ¹⁵⁴Gd	153.92087(2) u	2.18(2) %	stable	0+
Isotope ¹⁵⁵Gd	154.92263(2) u	14.80(9) %	stable	3/2-
Isotope ¹⁵⁶Gd	155.92213(2) u	20.47(3) %	stable	0+
Isotope ¹⁵⁷Gd	156.92397(2) u	15.65(4) %	stable	3/2-
Isotope ¹⁵⁸Gd	157.92411(2) u	24.84(8) %	stable	0+
Isotope ¹⁶⁰Gd	159.92706(2) u	21.86(3) %	stable	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 94) and isobaric (same nucleon number A = 158) with Gadolinium-158. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 94	Isobar A = 158
54	¹⁴⁸Xe
55	¹⁴⁹Cs
56	¹⁵⁰Ba
57	¹⁵¹La
58	¹⁵²Ce
59	¹⁵³Pr	¹⁵⁸Pr
60	¹⁵⁴Nd	¹⁵⁸Nd
61	¹⁵⁵Pm	¹⁵⁸Pm
62	¹⁵⁶Sm	¹⁵⁸Sm
63	¹⁵⁷Eu	¹⁵⁸Eu
64	¹⁵⁸Gd	¹⁵⁸Gd
65	¹⁵⁹Tb	¹⁵⁸Tb
66	¹⁶⁰Dy	¹⁵⁸Dy
67	¹⁶¹Ho	¹⁵⁸Ho
68	¹⁶²Er	¹⁵⁸Er
69	¹⁶³Tm	¹⁵⁸Tm
70	¹⁶⁴Yb	¹⁵⁸Yb
71	¹⁶⁵Lu	¹⁵⁸Lu
72	¹⁶⁶Hf	¹⁵⁸Hf
73	¹⁶⁷Ta	¹⁵⁸Ta
74	¹⁶⁸W	¹⁵⁸W
75	¹⁶⁹Re
76	¹⁷⁰Os
77	¹⁷¹Ir
78	¹⁷²Pt
79	¹⁷³Au
80	¹⁷⁴Hg