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Erbium-165

Properties and data of the isotope 165Er.

Contents
General Data
Radioactive Decay
Parent Nuclides
Isotones und Isobares

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

 

General data

Name of the isotope:Erbium-165; Er-165Symbol:165Er or 16568ErMass number A:165 (= number of nucleons)Atomic number Z:68 (= number of protons)Neutrons N:97Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4264705882353 (= neutron-proton ratio)Neutron excess (N-Z):29Isotopic mass:164.9307332(10) u (atomic weight of Erbium-165)Nuclide mass:164.8934331 u (calculated nuclear mass without electrons)Mass excess:-64.52161 MeVMass defect:1.441865828 u (per nucleus)Nuclear binding energy:1343.08936759 MeV (per nucleus)
8.13993556 MeV (average binding energy per nucleon)Separation energy:SN = 6.6500(6) MeV (first neutron)
SP = 6.8291(15) MeV (first proton)Half-life:10.36(4) hDecay constant λ:1.858502736379 × 10-5 s-1Specific activity α:6.824491016495 × 10+16 Bq g-1
1844457.0314853 Ci g-1Spin and parity:
(nuclear angular momentum)5/2-Magnetic dipole moment:μ(μN) = + 0.643(3)Quadrupole moment Q:+ 2.71(3) barn (100 fm2)Nuclear g-factor:gl = 0.2572Year of discovery:1950

 

Radioactive Decay

Half-life T½ = 10.36(4) h (hours) respectively 3.7296 × 104 seconds s.

Decay
mode		DaughterProbabilityDecay energyγ energy
(intensity)
EC165Ho100 %0.3774(14) MeV

 

Parent Nuclides

Direct parent isotope is: 165Tm.

 

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 165) with Erbium-165. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

 

ZIsotone N = 97Isobar A = 165
56153Ba
57154La
58155Ce
59156Pr
60157Nd
61158Pm
62159Sm165Sm
63160Eu165Eu
64161Gd165Gd
65162Tb165Tb
66163Dy165Dy
67164Ho165Ho
68165Er165Er
69166Tm165Tm
70167Yb165Yb
71168Lu165Lu
72169Hf165Hf
73170Ta165Ta
74171W165W
75172Re165Re
76173Os165Os
77174Ir165Ir
78175Pt165Pt
79176Au
80177Hg
81178Tl
82179Pb

 

External data and identifiers

Adopted Levels, Gammas:NuDat 165Er

 

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Last update: 2020-10-09

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