Tungsten-164

Properties and data of the isotope ¹⁶⁴W.

Content

General data

Name of the isotope:Tungsten-164; W-164Symbol:¹⁶⁴W or 16474WMass number A:164 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:90Isotopic mass:163.958952(10) u (atomic weight of Tungsten-164)Nuclide mass:163.9183611 u (calculated nuclear mass without electrons)Mass excess:-38.23597 MeVMass defect:1.399942808 u (per nucleus)Nuclear binding energy:1304.038326 MeV (per nucleus)
7.95145321 MeV (average binding energy per nucleon)Separation energy:S_N = 11.40(5) MeV (first neutron)
S_P = 2.99(4) MeV (first proton)Half-life:6.3(2) sDecay constant λ:0.11002336199364 s^-1Specific activity α:4.064884563248 × 10⁺²⁰ Bq g^-1
10986174495.266 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Year of discovery:1973

Radioactive Decay

Half-life T_½ = 6.3(2) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁶⁰Hf	3.8(12) %	5.2783(20) MeV
EE/β⁺	¹⁶⁴Ta	96.2(12) %	5.05(3) MeV

Parent Nuclides

Direct parent isotope is: ¹⁶⁸Os.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 90) and isobaric (same nucleon number A = 164) with Tungsten-164. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 90	Isobar A = 164
51	¹⁴¹Sb
52	¹⁴²Te
53	¹⁴³I
54	¹⁴⁴Xe
55	¹⁴⁵Cs
56	¹⁴⁶Ba
57	¹⁴⁷La
58	¹⁴⁸Ce
59	¹⁴⁹Pr
60	¹⁵⁰Nd
61	¹⁵¹Pm
62	¹⁵²Sm	¹⁶⁴Sm
63	¹⁵³Eu	¹⁶⁴Eu
64	¹⁵⁴Gd	¹⁶⁴Gd
65	¹⁵⁵Tb	¹⁶⁴Tb
66	¹⁵⁶Dy	¹⁶⁴Dy
67	¹⁵⁷Ho	¹⁶⁴Ho
68	¹⁵⁸Er	¹⁶⁴Er
69	¹⁵⁹Tm	¹⁶⁴Tm
70	¹⁶⁰Yb	¹⁶⁴Yb
71	¹⁶¹Lu	¹⁶⁴Lu
72	¹⁶²Hf	¹⁶⁴Hf
73	¹⁶³Ta	¹⁶⁴Ta
74	¹⁶⁴W	¹⁶⁴W
75	¹⁶⁵Re	¹⁶⁴Re
76	¹⁶⁶Os	¹⁶⁴Os
77	¹⁶⁷Ir	¹⁶⁴Ir
78	¹⁶⁸Pt