Erbium-147

Properties and data of the isotope ¹⁴⁷Er.

Content

General data

Name of the isotope:Erbium-147; Er-147Symbol:¹⁴⁷Er or 14768ErMass number A:147 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:79Isotopic mass:146.94996(4) u (atomic weight of Erbium-147)Nuclide mass:146.9126599 u (calculated nuclear mass without electrons)Mass excess:-46.61196 MeVMass defect:1.26667054 u (per nucleus)Nuclear binding energy:1179.89600799 MeV (per nucleus)
8.02650346 MeV (average binding energy per nucleon)Separation energy:S_N = 10.36(4) MeV (first neutron)
S_P = 2.66(4) MeV (first proton)Half-life:ca. 2.5 sDecay constant λ:0.27725887222398 s^-1Specific activity α:1.143624646027 × 10⁺²¹ Bq g^-1
30908774216.957 Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)Year of discovery:1992

Radioactive Decay

Half-life T_½ = ca. 2.5 s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁷Ho	100 %	9.15(4) MeV
β⁺, p	¹⁴⁶Dy	> 0 %

Parent Nuclides

Direct parent isotope is: ¹⁴⁷Tm.

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
^147mEr	+x keV	2.5(2) s	(11/2-)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 79) and isobaric (same nucleon number A = 147) with Erbium-147. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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