Gadolinium-163

Properties and data of the isotope ¹⁶³Gd.

Content

General data

Name of the isotope:Gadolinium-163; Gd-163Symbol:¹⁶³Gd or 16364GdMass number A:163 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:99Isotopic mass:162.934177(9) u (atomic weight of Gadolinium-163)Nuclide mass:162.8990707 u (calculated nuclear mass without electrons)Mass excess:-61.31373 MeVMass defect:1.424451732 u (per nucleus)Nuclear binding energy:1326.86824165 MeV (per nucleus)
8.14029596 MeV (average binding energy per nucleon)Separation energy:S_N = 5.105(9) MeV (first neutron)
S_P = 9.90(4) MeV (first proton)Half-life:68(3) sDecay constant λ:0.010193340890587 s^-1Specific activity α:3.789242881263 × 10⁺¹⁹ Bq g^-1
1024119697.6388 Ci g^-1Spin and parity:
(nuclear angular momentum)(5/2-.7/2+)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 68(3) s respectively 6.8 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶³Tb	100 %	3.282(9) MeV

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 163) with Gadolinium-163. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 99	Isobar A = 163
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr
60	¹⁵⁹Nd	¹⁶³Nd
61	¹⁶⁰Pm	¹⁶³Pm
62	¹⁶¹Sm	¹⁶³Sm
63	¹⁶²Eu	¹⁶³Eu
64	¹⁶³Gd	¹⁶³Gd
65	¹⁶⁴Tb	¹⁶³Tb
66	¹⁶⁵Dy	¹⁶³Dy
67	¹⁶⁶Ho	¹⁶³Ho
68	¹⁶⁷Er	¹⁶³Er
69	¹⁶⁸Tm	¹⁶³Tm
70	¹⁶⁹Yb	¹⁶³Yb
71	¹⁷⁰Lu	¹⁶³Lu
72	¹⁷¹Hf	¹⁶³Hf
73	¹⁷²Ta	¹⁶³Ta
74	¹⁷³W	¹⁶³W
75	¹⁷⁴Re	¹⁶³Re
76	¹⁷⁵Os	¹⁶³Os
77	¹⁷⁶Ir
78	¹⁷⁷Pt
79	¹⁷⁸Au
80	¹⁷⁹Hg
81	¹⁸⁰Tl
82	¹⁸¹Pb