Erbium-146

Properties and data of the isotope ¹⁴⁶Er.

Content

General data

Name of the isotope:Erbium-146; Er-146Symbol:¹⁴⁶Er or 14668ErMass number A:146 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:78Isotopic mass:145.952418(7) u (atomic weight of Erbium-146)Nuclide mass:145.9151179 u (calculated nuclear mass without electrons)Mass excess:-44.32235 MeVMass defect:1.255547624 u (per nucleus)Nuclear binding energy:1169.53507847 MeV (per nucleus)
8.01051424 MeV (average binding energy per nucleon)Separation energy:S_N = 13.15(20) MeV (first neutron)
S_P = 2.491(10) MeV (first proton)Half-life:1.7(6) sDecay constant λ:0.4077336356235 s^-1Specific activity α:1.693399577281 × 10⁺²¹ Bq g^-1
45767556142.754 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1993

Radioactive Decay

Half-life T_½ = 1.7(6) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁶Ho	100 %	6.916(9) MeV

Parent Nuclides

Direct parent isotope is: ¹⁴⁷Tm.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 78) and isobaric (same nucleon number A = 146) with Erbium-146. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 78	Isobar A = 146
43	¹²¹Tc
44	¹²²Ru
45	¹²³Rh
46	¹²⁴Pd
47	¹²⁵Ag
48	¹²⁶Cd
49	¹²⁷In
50	¹²⁸Sn
51	¹²⁹Sb
52	¹³⁰Te
53	¹³¹I
54	¹³²Xe	¹⁴⁶Xe
55	¹³³Cs	¹⁴⁶Cs
56	¹³⁴Ba	¹⁴⁶Ba
57	¹³⁵La	¹⁴⁶La
58	¹³⁶Ce	¹⁴⁶Ce
59	¹³⁷Pr	¹⁴⁶Pr
60	¹³⁸Nd	¹⁴⁶Nd
61	¹³⁹Pm	¹⁴⁶Pm
62	¹⁴⁰Sm	¹⁴⁶Sm
63	¹⁴¹Eu	¹⁴⁶Eu
64	¹⁴²Gd	¹⁴⁶Gd
65	¹⁴³Tb	¹⁴⁶Tb
66	¹⁴⁴Dy	¹⁴⁶Dy
67	¹⁴⁵Ho	¹⁴⁶Ho
68	¹⁴⁶Er	¹⁴⁶Er
69	¹⁴⁷Tm	¹⁴⁶Tm
70	¹⁴⁸Yb
71	¹⁴⁹Lu