Holmium-164m

Properties and data of the isotope ^164mHo.

Contents

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

General data

Name of the isotope:Holmium-164m; Ho-164mSymbol:^164mHo or 164m67HoMass number A:164 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:97Isotopic mass:163.9302395(16) u (atomic weight of Holmium-164m)
Excitation energy: 139.78(7) keVNuclide mass:163.8934878 u (calculated nuclear mass without electrons)Mass excess:-64.98149 MeVMass defect:1.434534496 u (per nucleus)Nuclear binding energy:1336.26027582 MeV (per nucleus)
8.14792851 MeV (average binding energy per nucleon)Half-life:36.6(3) minDecay constant λ:0.00031564079260471 s^-1Specific activity α:1.166155407489 × 10⁺¹⁸ Bq g^-1
31517713.71593 Ci g^-1Spin and parity:
(nuclear angular momentum)6-

Radioactive Decay

Half-life T_½ = 36.6(3) min (minutes) respectively 2.196 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁶⁴Ho	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
¹⁶⁴Ho		28.8(5) min	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 164) with Holmium-164m. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 97	Isobar A = 164
56	¹⁵³Ba
57	¹⁵⁴La
58	¹⁵⁵Ce
59	¹⁵⁶Pr
60	¹⁵⁷Nd
61	¹⁵⁸Pm
62	¹⁵⁹Sm	¹⁶⁴Sm
63	¹⁶⁰Eu	¹⁶⁴Eu
64	¹⁶¹Gd	¹⁶⁴Gd
65	¹⁶²Tb	¹⁶⁴Tb
66	¹⁶³Dy	¹⁶⁴Dy
67	¹⁶⁴Ho	¹⁶⁴Ho
68	¹⁶⁵Er	¹⁶⁴Er
69	¹⁶⁶Tm	¹⁶⁴Tm
70	¹⁶⁷Yb	¹⁶⁴Yb
71	¹⁶⁸Lu	¹⁶⁴Lu
72	¹⁶⁹Hf	¹⁶⁴Hf
73	¹⁷⁰Ta	¹⁶⁴Ta
74	¹⁷¹W	¹⁶⁴W
75	¹⁷²Re	¹⁶⁴Re
76	¹⁷³Os	¹⁶⁴Os
77	¹⁷⁴Ir	¹⁶⁴Ir
78	¹⁷⁵Pt
79	¹⁷⁶Au
80	¹⁷⁷Hg
81	¹⁷⁸Tl
82	¹⁷⁹Pb