Erbium-153

Properties and data of the isotope ¹⁵³Er.

Content

General data

Name of the isotope:Erbium-153; Er-153Symbol:¹⁵³Er or 15368ErMass number A:153 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:85Isotopic mass:152.935084(10) u (atomic weight of Erbium-153)Nuclide mass:152.8977839 u (calculated nuclear mass without electrons)Mass excess:-60.46886 MeVMass defect:1.333536036 u (per nucleus)Nuclear binding energy:1242.18081632 MeV (per nucleus)
8.11882886 MeV (average binding energy per nucleon)Separation energy:S_N = 8.04(12) MeV (first neutron)
S_P = 4.153(15) MeV (first proton)Half-life:37.1(2) sDecay constant λ:0.018683212414015 s^-1Specific activity α:7.402166899560 × 10⁺¹⁹ Bq g^-1
2000585648.5298 Ci g^-1Spin and parity:
(nuclear angular momentum)(7/2-)Magnetic dipole moment:μ(μ_N) = - 0.934(5)Quadrupole moment Q:- 4.20(20) barn (100 fm²)Nuclear g-factor:g_l = -0.26685714285714Year of discovery:1963

Radioactive Decay

Half-life T_½ = 37.1(2) s respectively 3.71 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁵³Ho	47(3) %	4.543(11) MeV
α	¹⁴⁹Dy	53(3) %	4.8024(14) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁵³Tm, ¹⁵⁷Yb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 85) and isobaric (same nucleon number A = 153) with Erbium-153. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 85	Isobar A = 153
47	¹³²Ag
48	¹³³Cd
49	¹³⁴In
50	¹³⁵Sn
51	¹³⁶Sb
52	¹³⁷Te
53	¹³⁸I
54	¹³⁹Xe
55	¹⁴⁰Cs
56	¹⁴¹Ba	¹⁵³Ba
57	¹⁴²La	¹⁵³La
58	¹⁴³Ce	¹⁵³Ce
59	¹⁴⁴Pr	¹⁵³Pr
60	¹⁴⁵Nd	¹⁵³Nd
61	¹⁴⁶Pm	¹⁵³Pm
62	¹⁴⁷Sm	¹⁵³Sm
63	¹⁴⁸Eu	¹⁵³Eu
64	¹⁴⁹Gd	¹⁵³Gd
65	¹⁵⁰Tb	¹⁵³Tb
66	¹⁵¹Dy	¹⁵³Dy
67	¹⁵²Ho	¹⁵³Ho
68	¹⁵³Er	¹⁵³Er
69	¹⁵⁴Tm	¹⁵³Tm
70	¹⁵⁵Yb	¹⁵³Yb
71	¹⁵⁶Lu	¹⁵³Lu
72	¹⁵⁷Hf	¹⁵³Hf
73	¹⁵⁸Ta
74	¹⁵⁹W
75	¹⁶⁰Re
76	¹⁶¹Os