Mercury-177

Properties and data of the isotope ¹⁷⁷Hg.

Content

General data

Name of the isotope:Mercury-177; Hg-177Symbol:¹⁷⁷Hg or 17780HgMass number A:177 (= number of nucleons)Atomic number Z:80 (= number of protons)Neutrons N:97Isotopic mass:176.98628(8) u (atomic weight of Mercury-177)Nuclide mass:176.9423984 u (calculated nuclear mass without electrons)Mass excess:-12.7801 MeVMass defect:1.480219412 u (per nucleus)Nuclear binding energy:1378.81550096 MeV (per nucleus)
7.78991808 MeV (average binding energy per nucleon)Separation energy:S_N = 9.07(8) MeV (first neutron)
S_P = 1.55(8) MeV (first proton)Half-life:0.117(7) sDecay constant λ:5.9243348765807 s^-1Specific activity α:2.027112450466 × 10⁺²² Bq g^-1
547868229855.73 Ci g^-1Spin and parity:
(nuclear angular momentum)7/2-Magnetic dipole moment:μ(μ_N) = -1.025(48)Quadrupole moment Q:0.57 barn (100 fm²)Nuclear g-factor:g_l = -0.29285714285714Year of discovery:1975

Radioactive Decay

Half-life T_½ = 0.117(7) s respectively 1.17 × 10^-1 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁷³Pt	100 %	6.74(5) MeV

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
^177mHg	323.2(12) keV	1.50(15) μs	13/2+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 97) and isobaric (same nucleon number A = 177) with Mercury-177. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

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