Lutetium-159

Properties and data of the isotope ¹⁵⁹Lu.

Contents

General data

Name of the isotope:Lutetium-159; Lu-159Symbol:¹⁵⁹Lu or 15971LuMass number A:159 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:88Isotopic mass:158.94664(4) u (atomic weight of Lutetium-159)Nuclide mass:158.9076945 u (calculated nuclear mass without electrons)Mass excess:-49.70452 MeVMass defect:1.37144988 u (per nucleus)Nuclear binding energy:1277.49733452 MeV (per nucleus)
8.03457443 MeV (average binding energy per nucleon)Separation energy:S_N = 10.57(4) MeV (first neutron)
S_P = 0.99(4) MeV (first proton)Half-life:12.1(10) sDecay constant λ:0.057284890955367 s^-1Specific activity α:2.183403053666 × 10⁺²⁰ Bq g^-1
5901089334.2343 Ci g^-1Spin and parity:
(nuclear angular momentum)Year of discovery:1980

Radioactive Decay

Half-life T_½ = 12.1(10) s respectively 1.21 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	¹⁵⁹Yb	ca. 100 %	6.13(4) MeV
α	¹⁵⁵Tm	~ 0.1 %	4.49(4) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶³Ta.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 88) and isobaric (same nucleon number A = 159) with Lutetium-159. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 88	Isobar A = 159
49	¹³⁷In
50	¹³⁸Sn
51	¹³⁹Sb
52	¹⁴⁰Te
53	¹⁴¹I
54	¹⁴²Xe
55	¹⁴³Cs
56	¹⁴⁴Ba
57	¹⁴⁵La
58	¹⁴⁶Ce
59	¹⁴⁷Pr	¹⁵⁹Pr
60	¹⁴⁸Nd	¹⁵⁹Nd
61	¹⁴⁹Pm	¹⁵⁹Pm
62	¹⁵⁰Sm	¹⁵⁹Sm
63	¹⁵¹Eu	¹⁵⁹Eu
64	¹⁵²Gd	¹⁵⁹Gd
65	¹⁵³Tb	¹⁵⁹Tb
66	¹⁵⁴Dy	¹⁵⁹Dy
67	¹⁵⁵Ho	¹⁵⁹Ho
68	¹⁵⁶Er	¹⁵⁹Er
69	¹⁵⁷Tm	¹⁵⁹Tm
70	¹⁵⁸Yb	¹⁵⁹Yb
71	¹⁵⁹Lu	¹⁵⁹Lu
72	¹⁶⁰Hf	¹⁵⁹Hf
73	¹⁶¹Ta	¹⁵⁹Ta
74	¹⁶²W	¹⁵⁹W
75	¹⁶³Re	¹⁵⁹Re
76	¹⁶⁴Os
77	¹⁶⁵Ir
78	¹⁶⁶Pt