Dysprosium-159m

Properties and data of the isotope ^159mDy.

Contents

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

General data

Name of the isotope:Dysprosium-159m; Dy-159mSymbol:^159mDy or 159m66DyMass number A:159 (= number of nucleons)Atomic number Z:66 (= number of protons)Neutrons N:93Isotopic mass:158.9257460(16) u (atomic weight of Dysprosium-159m)
Excitation energy: 352.77(14) keVNuclide mass:158.8895428 u (calculated nuclear mass without electrons)Mass excess:-69.16716 MeVMass defect:1.3965433 u (per nucleus)Nuclear binding energy:1300.87170469 MeV (per nucleus)
8.18158305 MeV (average binding energy per nucleon)Half-life:122(3) μsDecay constant λ:5681.5342668848 s^-1Specific activity α:2.165506307325 × 10⁺²⁵ Bq g^-1
5.852719749527 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)11/2-

Radioactive Decay

Half-life T_½ = 122(3) μs respectively 1.22 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁵⁹Dy	100 %

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
¹⁵⁹Dy		144.4(2) d	3/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 93) and isobaric (same nucleon number A = 159) with Dysprosium-159m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 93	Isobar A = 159
54	¹⁴⁷Xe
55	¹⁴⁸Cs
56	¹⁴⁹Ba
57	¹⁵⁰La
58	¹⁵¹Ce	¹⁵⁹Ce
59	¹⁵²Pr	¹⁵⁹Pr
60	¹⁵³Nd	¹⁵⁹Nd
61	¹⁵⁴Pm	¹⁵⁹Pm
62	¹⁵⁵Sm	¹⁵⁹Sm
63	¹⁵⁶Eu	¹⁵⁹Eu
64	¹⁵⁷Gd	¹⁵⁹Gd
65	¹⁵⁸Tb	¹⁵⁹Tb
66	¹⁵⁹Dy	¹⁵⁹Dy
67	¹⁶⁰Ho	¹⁵⁹Ho
68	¹⁶¹Er	¹⁵⁹Er
69	¹⁶²Tm	¹⁵⁹Tm
70	¹⁶³Yb	¹⁵⁹Yb
71	¹⁶⁴Lu	¹⁵⁹Lu
72	¹⁶⁵Hf	¹⁵⁹Hf
73	¹⁶⁶Ta	¹⁵⁹Ta
74	¹⁶⁷W	¹⁵⁹W
75	¹⁶⁸Re	¹⁵⁹Re
76	¹⁶⁹Os
77	¹⁷⁰Ir
78	¹⁷¹Pt
79	¹⁷²Au
80	¹⁷³Hg