Gadolinium-148

Properties and data of the isotope ¹⁴⁸Gd.

Contents

General data

Name of the isotope:Gadolinium-148; Gd-148Symbol:¹⁴⁸Gd or 14864GdMass number A:148 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:84Isotopic mass:147.9181215(17) u (atomic weight of Gadolinium-148)Nuclide mass:147.8830152 u (calculated nuclear mass without electrons)Mass excess:-76.26933 MeVMass defect:1.310533492 u (per nucleus)Nuclear binding energy:1220.7540846 MeV (per nucleus)
8.24833841 MeV (average binding energy per nucleon)Separation energy:S_N = 8.9837(12) MeV (first neutron)
S_P = 6.0135(24) MeV (first proton)Half-life:71.1(12) aDecay constant λ:3.091370888234 × 10^-10 s^-1Specific activity α:1266440199949.4 Bq g^-1
34.228113512146 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.0080(171) femtometer fmYear of discovery:1953

Radioactive Decay

Half-life T_½ = 71.1(12) a respectively 2.2422 × 10⁹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁴⁴Sm	100 %	3.27129(3) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁴⁸Tb, ¹⁵²Dy.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 148) with Gadolinium-148. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 84	Isobar A = 148
47	¹³¹Ag
48	¹³²Cd
49	¹³³In
50	¹³⁴Sn
51	¹³⁵Sb
52	¹³⁶Te
53	¹³⁷I
54	¹³⁸Xe	¹⁴⁸Xe
55	¹³⁹Cs	¹⁴⁸Cs
56	¹⁴⁰Ba	¹⁴⁸Ba
57	¹⁴¹La	¹⁴⁸La
58	¹⁴²Ce	¹⁴⁸Ce
59	¹⁴³Pr	¹⁴⁸Pr
60	¹⁴⁴Nd	¹⁴⁸Nd
61	¹⁴⁵Pm	¹⁴⁸Pm
62	¹⁴⁶Sm	¹⁴⁸Sm
63	¹⁴⁷Eu	¹⁴⁸Eu
64	¹⁴⁸Gd	¹⁴⁸Gd
65	¹⁴⁹Tb	¹⁴⁸Tb
66	¹⁵⁰Dy	¹⁴⁸Dy
67	¹⁵¹Ho	¹⁴⁸Ho
68	¹⁵²Er	¹⁴⁸Er
69	¹⁵³Tm	¹⁴⁸Tm
70	¹⁵⁴Yb	¹⁴⁸Yb
71	¹⁵⁵Lu
72	¹⁵⁶Hf
73	¹⁵⁷Ta
74	¹⁵⁸W
75	¹⁵⁹Re
76	¹⁶⁰Os