Dysprosium-165m

Properties and data of the isotope ^165mDy.

Contents

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

General data

Name of the isotope:Dysprosium-165m; Dy-165mSymbol:^165mDy or 165m66DyMass number A:165 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:99Isotopic mass:164.9317094(7) u (atomic weight of Dysprosium-165m)
Excitation energy: 108.1552(13) keVNuclide mass:164.8955062 u (calculated nuclear mass without electrons)Mass excess:-63.61228 MeVMass defect:1.442569396 u (per nucleus)Nuclear binding energy:1343.74473696 MeV (per nucleus)
8.1439075 MeV (average binding energy per nucleon)Half-life:1.257(6) minDecay constant λ:0.0091904956319271 s^-1Specific activity α:3.374784101713 × 10⁺¹⁹ Bq g^-1
912103811.27386 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-

Radioactive Decay

Half-life T_½ = 1.257(6) min (minutes) respectively 7.542 × 10¹ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁶⁵Ho	2.24(11) %		0.4537(6) MeV 83(2) %
Iso	¹⁶⁵Dy	97.76(11) %

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
¹⁶⁵Dy		2.332(4) h	7/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 99) and isobaric (same nucleon number A = 165) with Dysprosium-165m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 99	Isobar A = 165
57	¹⁵⁶La
58	¹⁵⁷Ce
59	¹⁵⁸Pr
60	¹⁵⁹Nd
61	¹⁶⁰Pm
62	¹⁶¹Sm	¹⁶⁵Sm
63	¹⁶²Eu	¹⁶⁵Eu
64	¹⁶³Gd	¹⁶⁵Gd
65	¹⁶⁴Tb	¹⁶⁵Tb
66	¹⁶⁵Dy	¹⁶⁵Dy
67	¹⁶⁶Ho	¹⁶⁵Ho
68	¹⁶⁷Er	¹⁶⁵Er
69	¹⁶⁸Tm	¹⁶⁵Tm
70	¹⁶⁹Yb	¹⁶⁵Yb
71	¹⁷⁰Lu	¹⁶⁵Lu
72	¹⁷¹Hf	¹⁶⁵Hf
73	¹⁷²Ta	¹⁶⁵Ta
74	¹⁷³W	¹⁶⁵W
75	¹⁷⁴Re	¹⁶⁵Re
76	¹⁷⁵Os	¹⁶⁵Os
77	¹⁷⁶Ir	¹⁶⁵Ir
78	¹⁷⁷Pt
79	¹⁷⁸Au
80	¹⁷⁹Hg
81	¹⁸⁰Tl
82	¹⁸¹Pb