Lutetium-156m

Properties and data of the isotope ^156mLu.

Contents

General data

Name of the isotope:Lutetium-156m; Lu-156mSymbol:^156mLu or 156m71LuMass number A:156 (= number of nucleons)Atomic number Z:71 (= number of protons)Neutrons N:85Isotopic mass:155.95309(6) u (atomic weight of Lutetium-156m)
Excitation energy: +x keVNuclide mass:155.9141445 u (calculated nuclear mass without electrons)Mass excess:-43.69638 MeVMass defect:1.339005132 u (per nucleus)Nuclear binding energy:1247.27524643 MeV (per nucleus)
7.99535414 MeV (average binding energy per nucleon)Half-life:198(2) msDecay constant λ:3.5007433361613 s^-1Specific activity α:1.360127063538 × 10⁺²² Bq g^-1
367601909064.49 Ci g^-1Spin and parity:
(nuclear angular momentum)9+

Radioactive Decay

Half-life T_½ = 198(2) ms respectively 1.98 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁵²Tm	100 %

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
¹⁵⁶Lu		494(12) ms	(2)-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 156) with Lutetium-156m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 85	Isobar A = 156
47	¹³²Ag
48	¹³³Cd
49	¹³⁴In
50	¹³⁵Sn
51	¹³⁶Sb
52	¹³⁷Te
53	¹³⁸I
54	¹³⁹Xe
55	¹⁴⁰Cs
56	¹⁴¹Ba
57	¹⁴²La	¹⁵⁶La
58	¹⁴³Ce	¹⁵⁶Ce
59	¹⁴⁴Pr	¹⁵⁶Pr
60	¹⁴⁵Nd	¹⁵⁶Nd
61	¹⁴⁶Pm	¹⁵⁶Pm
62	¹⁴⁷Sm	¹⁵⁶Sm
63	¹⁴⁸Eu	¹⁵⁶Eu
64	¹⁴⁹Gd	¹⁵⁶Gd
65	¹⁵⁰Tb	¹⁵⁶Tb
66	¹⁵¹Dy	¹⁵⁶Dy
67	¹⁵²Ho	¹⁵⁶Ho
68	¹⁵³Er	¹⁵⁶Er
69	¹⁵⁴Tm	¹⁵⁶Tm
70	¹⁵⁵Yb	¹⁵⁶Yb
71	¹⁵⁶Lu	¹⁵⁶Lu
72	¹⁵⁷Hf	¹⁵⁶Hf
73	¹⁵⁸Ta	¹⁵⁶Ta
74	¹⁵⁹W	¹⁵⁶W
75	¹⁶⁰Re
76	¹⁶¹Os