Holmium-146

Properties and data of the isotope ¹⁴⁶Ho.

Content

General data

Name of the isotope:Holmium-146; Ho-146Symbol:¹⁴⁶Ho or 14667HoMass number A:146 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:79Isotopic mass:145.944994(7) u (atomic weight of Holmium-146)Nuclide mass:145.9082423 u (calculated nuclear mass without electrons)Mass excess:-51.23776 MeVMass defect:1.263811508 u (per nucleus)Nuclear binding energy:1177.23283683 MeV (per nucleus)
8.06323861 MeV (average binding energy per nucleon)Separation energy:S_N = 10.189(10) MeV (first neutron)
S_P = 0.285(9) MeV (first proton)Half-life:3.32(22) sDecay constant λ:0.208779271253 s^-1Specific activity α:8.671021931865 × 10⁺²⁰ Bq g^-1
23435194410.447 Ci g^-1Spin and parity:
(nuclear angular momentum)(6-)Year of discovery:1982

Radioactive Decay

Half-life T_½ = 3.32(22) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁶Dy	100 %	11.317(9) MeV
EE, p	¹⁴⁵Tb	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 146) with Holmium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 79	Isobar A = 146
44	¹²³Ru
45	¹²⁴Rh
46	¹²⁵Pd
47	¹²⁶Ag
48	¹²⁷Cd
49	¹²⁸In
50	¹²⁹Sn
51	¹³⁰Sb
52	¹³¹Te
53	¹³²I
54	¹³³Xe	¹⁴⁶Xe
55	¹³⁴Cs	¹⁴⁶Cs
56	¹³⁵Ba	¹⁴⁶Ba
57	¹³⁶La	¹⁴⁶La
58	¹³⁷Ce	¹⁴⁶Ce
59	¹³⁸Pr	¹⁴⁶Pr
60	¹³⁹Nd	¹⁴⁶Nd
61	¹⁴⁰Pm	¹⁴⁶Pm
62	¹⁴¹Sm	¹⁴⁶Sm
63	¹⁴²Eu	¹⁴⁶Eu
64	¹⁴³Gd	¹⁴⁶Gd
65	¹⁴⁴Tb	¹⁴⁶Tb
66	¹⁴⁵Dy	¹⁴⁶Dy
67	¹⁴⁶Ho	¹⁴⁶Ho
68	¹⁴⁷Er	¹⁴⁶Er
69	¹⁴⁸Tm	¹⁴⁶Tm
70	¹⁴⁹Yb
71	¹⁵⁰Lu