Wolfram-180m2

Properties and data of the isotope ^180m2W.

Contents

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

General data

Name of the isotope:Wolfram-180m2; W-180m2Symbol:^180m2W or 180m274WMass number A:180 (= number of nucleons)Atomic number Z:74 (= number of protons)Neutrons N:106Nucleon pairing (Z - N):even - evenNuclear ratio (N/Z ratio):1.4324324324324 (= neutron-proton ratio)Neutron excess (N-Z):32Excitation energy:3264.9(3) keVIsotopic mass:179.94671(2) u (atomic weight of Wolfram-180m2)Nuclide mass:179.9061191 u (calculated nuclear mass without electrons)Mass excess:-49.63932 MeVMass defect:1.550823464 u (per nucleus)Nuclear binding energy:1444.58275178 MeV (per nucleus)
8.02545973 MeV (average binding energy per nucleon)Half-life:2.3(2) μsDecay constant λ:301368.33937389 s^-1Specific activity α:1.013900888511 × 10⁺²⁷ Bq g^-1
2.740272671651 × 10⁺¹⁶ Ci g^-1Spin and parity:
(nuclear angular momentum)14-

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
¹⁸⁰W		1.8(2) × 10¹⁸ a	0+
^180mW	1529.05(4) keV	5.47(9) ms	8-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 106) and isobaric (same nucleon number A = 180) with Wolfram-180m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 106	Isobar A = 180
64	¹⁷⁰Gd
65	¹⁷¹Tb
66	¹⁷²Dy
67	¹⁷³Ho
68	¹⁷⁴Er
69	¹⁷⁵Tm
70	¹⁷⁶Yb	¹⁸⁰Yb
71	¹⁷⁷Lu	¹⁸⁰Lu
72	¹⁷⁸Hf	¹⁸⁰Hf
73	¹⁷⁹Ta	¹⁸⁰Ta
74	¹⁸⁰W	¹⁸⁰W
75	¹⁸¹Re	¹⁸⁰Re
76	¹⁸²Os	¹⁸⁰Os
77	¹⁸³Ir	¹⁸⁰Ir
78	¹⁸⁴Pt	¹⁸⁰Pt
79	¹⁸⁵Au	¹⁸⁰Au
80	¹⁸⁶Hg	¹⁸⁰Hg
81	¹⁸⁷Tl	¹⁸⁰Tl
82	¹⁸⁸Pb	¹⁸⁰Pb
83	¹⁸⁹Bi
84	¹⁹⁰Po
85	¹⁹¹At