Gadolinium-161

Properties and data of the isotope ¹⁶¹Gd.

Contents

General data

Name of the isotope:Gadolinium-161; Gd-161Symbol:¹⁶¹Gd or 16164GdMass number A:161 (= number of nucleons)Atomic number Z:64 (= number of protons)Neutrons N:97Isotopic mass:160.9296763(16) u (atomic weight of Gadolinium-161)Nuclide mass:160.89457 u (calculated nuclear mass without electrons)Mass excess:-65.5061 MeVMass defect:1.4116226 u (per nucleus)Nuclear binding energy:1314.91798216 MeV (per nucleus)
8.16719244 MeV (average binding energy per nucleon)Separation energy:S_N = 5.6354(10) MeV (first neutron)
S_P = 9.3017(18) MeV (first proton)Half-life:3.66(5) minDecay constant λ:0.0031564079260471 s^-1Specific activity α:1.188020821379 × 10⁺¹⁹ Bq g^-1
321086708.48103 Ci g^-1Spin and parity:
(nuclear angular momentum)5/2-Year of discovery:1949

Radioactive Decay

Half-life T_½ = 3.66(5) min (minutes) respectively 2.196 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶¹Tb	100 %	1.9556(14) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶¹Eu.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 161) with Gadolinium-161. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 97	Isobar A = 161
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce
59	¹⁵⁶Pr
60	¹⁵⁷Nd	¹⁶¹Nd
61	¹⁵⁸Pm	¹⁶¹Pm
62	¹⁵⁹Sm	¹⁶¹Sm
63	¹⁶⁰Eu	¹⁶¹Eu
64	¹⁶¹Gd	¹⁶¹Gd
65	¹⁶²Tb	¹⁶¹Tb
66	¹⁶³Dy	¹⁶¹Dy
67	¹⁶⁴Ho	¹⁶¹Ho
68	¹⁶⁵Er	¹⁶¹Er
69	¹⁶⁶Tm	¹⁶¹Tm
70	¹⁶⁷Yb	¹⁶¹Yb
71	¹⁶⁸Lu	¹⁶¹Lu
72	¹⁶⁹Hf	¹⁶¹Hf
73	¹⁷⁰Ta	¹⁶¹Ta
74	¹⁷¹W	¹⁶¹W
75	¹⁷²Re	¹⁶¹Re
76	¹⁷³Os	¹⁶¹Os
77	¹⁷⁴Ir
78	¹⁷⁵Pt
79	¹⁷⁶Au
80	¹⁷⁷Hg
81	¹⁷⁸Tl
82	¹⁷⁹Pb