Erbium-152

Properties and data of the isotope ¹⁵²Er.

Content

General data

Name of the isotope:Erbium-152; Er-152Symbol:¹⁵²Er or 15268ErMass number A:152 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:84Isotopic mass:151.935050(9) u (atomic weight of Erbium-152)Nuclide mass:151.8977499 u (calculated nuclear mass without electrons)Mass excess:-60.50054 MeVMass defect:1.32490512 u (per nucleus)Nuclear binding energy:1234.14116985 MeV (per nucleus)
8.1193498 MeV (average binding energy per nucleon)Separation energy:S_N = 10.305(19) MeV (first neutron)
S_P = 4.167(12) MeV (first proton)Half-life:10.3(1) sDecay constant λ:0.06729584277281 s^-1Specific activity α:2.683874466662 × 10⁺²⁰ Bq g^-1
7253714774.7632 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:5.0843(257) femtometer fmYear of discovery:1963

Radioactive Decay

Half-life T_½ = 10.3(1) s respectively 1.03 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	¹⁵²Ho	10(4) %	3.104(15) MeV
α	¹⁴⁸Dy	90(4) %	4.9343(16) MeV

Parent Nuclides

Direct parent isotopes are: ¹⁵²Tm, ¹⁵³Yb, ¹⁵⁶Yb.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 84) and isobaric (same nucleon number A = 152) with Erbium-152. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 84	Isobar A = 152
47	¹³¹Ag
48	¹³²Cd
49	¹³³In
50	¹³⁴Sn
51	¹³⁵Sb
52	¹³⁶Te
53	¹³⁷I
54	¹³⁸Xe
55	¹³⁹Cs
56	¹⁴⁰Ba	¹⁵²Ba
57	¹⁴¹La	¹⁵²La
58	¹⁴²Ce	¹⁵²Ce
59	¹⁴³Pr	¹⁵²Pr
60	¹⁴⁴Nd	¹⁵²Nd
61	¹⁴⁵Pm	¹⁵²Pm
62	¹⁴⁶Sm	¹⁵²Sm
63	¹⁴⁷Eu	¹⁵²Eu
64	¹⁴⁸Gd	¹⁵²Gd
65	¹⁴⁹Tb	¹⁵²Tb
66	¹⁵⁰Dy	¹⁵²Dy
67	¹⁵¹Ho	¹⁵²Ho
68	¹⁵²Er	¹⁵²Er
69	¹⁵³Tm	¹⁵²Tm
70	¹⁵⁴Yb	¹⁵²Yb
71	¹⁵⁵Lu	¹⁵²Lu
72	¹⁵⁶Hf
73	¹⁵⁷Ta
74	¹⁵⁸W
75	¹⁵⁹Re