Holmium-174

Properties and data of the isotope ¹⁷⁴Ho.

Content

General data

Name of the isotope:Holmium-174; Ho-174Symbol:¹⁷⁴Ho or 17467HoMass number A:174 (= number of nucleons)Atomic number Z:67 (= number of protons)Neutrons N:107Isotopic mass:173.95095(32) u (atomic weight of Holmium-174)Nuclide mass:173.9141983 u (calculated nuclear mass without electrons)Mass excess:-45.68978 MeVMass defect:1.500473156 u (per nucleus)Nuclear binding energy:1397.68174198 MeV (per nucleus)
8.03265369 MeV (average binding energy per nucleon)Separation energy:S_N = 4.41(42) MeV (first neutron)
S_P = 9.04(50) MeV (first proton)Half-life:3.2(11) sDecay constant λ:0.21660849392498 s^-1Specific activity α:7.540155270953 × 10⁺²⁰ Bq g^-1
20378798029.605 Ci g^-1Spin and parity:
(nuclear angular momentum)(8-)Year of discovery:2012

Radioactive Decay

Half-life T_½ = 3.2(11) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	¹⁷⁴Er	100 %	6.26(42) MeV
β^-, n	¹⁷³Er	?

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 107) and isobaric (same nucleon number A = 174) with Holmium-174. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 107	Isobar A = 174
65	¹⁷²Tb
66	¹⁷³Dy	¹⁷⁴Dy
67	¹⁷⁴Ho	¹⁷⁴Ho
68	¹⁷⁵Er	¹⁷⁴Er
69	¹⁷⁶Tm	¹⁷⁴Tm
70	¹⁷⁷Yb	¹⁷⁴Yb
71	¹⁷⁸Lu	¹⁷⁴Lu
72	¹⁷⁹Hf	¹⁷⁴Hf
73	¹⁸⁰Ta	¹⁷⁴Ta
74	¹⁸¹W	¹⁷⁴W
75	¹⁸²Re	¹⁷⁴Re
76	¹⁸³Os	¹⁷⁴Os
77	¹⁸⁴Ir	¹⁷⁴Ir
78	¹⁸⁵Pt	¹⁷⁴Pt
79	¹⁸⁶Au	¹⁷⁴Au
80	¹⁸⁷Hg	¹⁷⁴Hg
81	¹⁸⁸Tl
82	¹⁸⁹Pb
83	¹⁹⁰Bi
84	¹⁹¹Po
85	¹⁹²At
86	¹⁹³Rn