Europium-150m

Properties and data of the isotope ^150mEu.

Contents

See also: List of individual Europium isotopes (and general data sources).

General data

Name of the isotope:Europium-150m; Eu-150mSymbol:^150mEu or 150m63EuMass number A:150 (= number of nucleons)Atomic number Z:63 (= number of protons)Neutrons N:87Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.3809523809524 (= neutron-proton ratio)Neutron excess (N-Z):24Excitation energy:41.7(10) keVIsotopic mass:149.919707(7) u (atomic weight of Europium-150m)Nuclide mass:149.8851492 u (calculated nuclear mass without electrons)Mass excess:-74.79245 MeVMass defect:1.327117708 u (per nucleus)Nuclear binding energy:1236.2021823 MeV (per nucleus)
8.24134788 MeV (average binding energy per nucleon)Half-life:12.8(1) hDecay constant λ:1.504225652256 × 10^-5 s^-1Specific activity α:6.042340125900 × 10⁺¹⁶ Bq g^-1
1633064.898892 Ci g^-1Spin and parity:
(nuclear angular momentum)0-

Radioactive Decay

Half-life T_½ = 12.8(1) h (hours) respectively 4.6080 × 10⁴ seconds s.

Decay mode	Daughter	Probability
EC/β⁺	¹⁵¹Sm	11(2) %
β^-	¹⁵⁰Gd	89(2) %
Iso	¹⁵⁰Eu	<< 1 %

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
¹⁵⁰Eu		36.9(9) years	5-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 87) and isobaric (same nucleon number A = 150) with Europium-150m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 87	Isobar A = 150
49	¹³⁶In
50	¹³⁷Sn
51	¹³⁸Sb
52	¹³⁹Te
53	¹⁴⁰I
54	¹⁴¹Xe
55	¹⁴²Cs	¹⁵⁰Cs
56	¹⁴³Ba	¹⁵⁰Ba
57	¹⁴⁴La	¹⁵⁰La
58	¹⁴⁵Ce	¹⁵⁰Ce
59	¹⁴⁶Pr	¹⁵⁰Pr
60	¹⁴⁷Nd	¹⁵⁰Nd
61	¹⁴⁸Pm	¹⁵⁰Pm
62	¹⁴⁹Sm	¹⁵⁰Sm
63	¹⁵⁰Eu	¹⁵⁰Eu
64	¹⁵¹Gd	¹⁵⁰Gd
65	¹⁵²Tb	¹⁵⁰Tb
66	¹⁵³Dy	¹⁵⁰Dy
67	¹⁵⁴Ho	¹⁵⁰Ho
68	¹⁵⁵Er	¹⁵⁰Er
69	¹⁵⁶Tm	¹⁵⁰Tm
70	¹⁵⁷Yb	¹⁵⁰Yb
71	¹⁵⁸Lu	¹⁵⁰Lu
72	¹⁵⁹Hf
73	¹⁶⁰Ta
74	¹⁶¹W
75	¹⁶²Re
76	¹⁶³Os
77	¹⁶⁴Ir
78	¹⁶⁵Pt