Erbium-145m

Properties and data of the isotope ¹⁴⁵Er.

Content

General data

Name of the isotope:Erbium-145m; Er-145mSymbol:¹⁴⁵Er or 14568ErMass number A:145 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:77Isotopic mass:144.95787(21) u (atomic weight of Erbium-145m)
Excitation energy: 253 keVNuclide mass:144.9205699 u (calculated nuclear mass without electrons)Mass excess:-39.24384 MeVMass defect:1.241430708 u (per nucleus)Nuclear binding energy:1156.38525592 MeV (per nucleus)
7.97507073 MeV (average binding energy per nucleon)Half-life:0.9(3) sDecay constant λ:0.77016353395549 s^-1Specific activity α:3.220856449074 × 10⁺²¹ Bq g^-1
87050174299.3 Ci g^-1Spin and parity:
(nuclear angular momentum)(11/2-)

Radioactive Decay

Half-life T_½ = 0.9(3) s respectively 9 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁴⁵Ho	100 %
EE, p	¹⁴⁴Dy	?

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
¹⁴⁵Er			(1/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 77) and isobaric (same nucleon number A = 145) with Erbium-145m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 77	Isobar A = 145
43	¹²⁰Tc
44	¹²¹Ru
45	¹²²Rh
46	¹²³Pd
47	¹²⁴Ag
48	¹²⁵Cd
49	¹²⁶In
50	¹²⁷Sn
51	¹²⁸Sb
52	¹²⁹Te
53	¹³⁰I	¹⁴⁵I
54	¹³¹Xe	¹⁴⁵Xe
55	¹³²Cs	¹⁴⁵Cs
56	¹³³Ba	¹⁴⁵Ba
57	¹³⁴La	¹⁴⁵La
58	¹³⁵Ce	¹⁴⁵Ce
59	¹³⁶Pr	¹⁴⁵Pr
60	¹³⁷Nd	¹⁴⁵Nd
61	¹³⁸Pm	¹⁴⁵Pm
62	¹³⁹Sm	¹⁴⁵Sm
63	¹⁴⁰Eu	¹⁴⁵Eu
64	¹⁴¹Gd	¹⁴⁵Gd
65	¹⁴²Tb	¹⁴⁵Tb
66	¹⁴³Dy	¹⁴⁵Dy
67	¹⁴⁴Ho	¹⁴⁵Ho
68	¹⁴⁵Er	¹⁴⁵Er
69	¹⁴⁶Tm	¹⁴⁵Tm