Dysprosium-146m

Properties and data of the isotope ¹⁴⁶Dy.

Content

General data

Name of the isotope:Dysprosium-146m; Dy-146mSymbol:¹⁴⁶Dy or 14666DyMass number A:146 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:80Isotopic mass:145.932845(7) u (atomic weight of Dysprosium-146m)
Excitation energy: 2934.5(4) keVNuclide mass:145.8966418 u (calculated nuclear mass without electrons)Mass excess:-62.55448 MeVMass defect:1.276800392 u (per nucleus)Nuclear binding energy:1189.33190435 MeV (per nucleus)
8.14610893 MeV (average binding energy per nucleon)Half-life:0.150(20) sDecay constant λ:4.620981203733 s^-1Specific activity α:1.919186187586 × 10⁺²² Bq g^-1
518698969617.89 Ci g^-1Spin and parity:
(nuclear angular momentum)(10+)

Radioactive Decay

Half-life T_½ = 0.150(20) s respectively 1.50 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁴⁶Dy	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
¹⁴⁶Dy		33.2(7) s	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 80) and isobaric (same nucleon number A = 146) with Dysprosium-146m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 80	Isobar A = 146
44	¹²⁴Ru
45	¹²⁵Rh
46	¹²⁶Pd
47	¹²⁷Ag
48	¹²⁸Cd
49	¹²⁹In
50	¹³⁰Sn
51	¹³¹Sb
52	¹³²Te
53	¹³³I
54	¹³⁴Xe	¹⁴⁶Xe
55	¹³⁵Cs	¹⁴⁶Cs
56	¹³⁶Ba	¹⁴⁶Ba
57	¹³⁷La	¹⁴⁶La
58	¹³⁸Ce	¹⁴⁶Ce
59	¹³⁹Pr	¹⁴⁶Pr
60	¹⁴⁰Nd	¹⁴⁶Nd
61	¹⁴¹Pm	¹⁴⁶Pm
62	¹⁴²Sm	¹⁴⁶Sm
63	¹⁴³Eu	¹⁴⁶Eu
64	¹⁴⁴Gd	¹⁴⁶Gd
65	¹⁴⁵Tb	¹⁴⁶Tb
66	¹⁴⁶Dy	¹⁴⁶Dy
67	¹⁴⁷Ho	¹⁴⁶Ho
68	¹⁴⁸Er	¹⁴⁶Er
69	¹⁴⁹Tm	¹⁴⁶Tm
70	¹⁵⁰Yb
71	¹⁵¹Lu