Hafnium-177m2

Properties and data of the isotope ^177m2Hf.

Contents

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

General data

Name of the isotope:Hafnium-177m2; Hf-177m2Symbol:^177m2Hf or 177m272HfMass number A:177 (= number of nucleons)Atomic number Z:72 (= number of protons)Neutrons N:105Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.4583333333333 (= neutron-proton ratio)Neutron excess (N-Z):33Excitation energy:1342.4(10) keVIsotopic mass:176.94323(2) u (atomic weight of Hafnium-177m2)Nuclide mass:176.903736 u (calculated nuclear mass without electrons)Mass excess:-52.88091 MeVMass defect:1.529988484 u (per nucleus)Nuclear binding energy:1425.17509292 MeV (per nucleus)
8.05183668 MeV (average binding energy per nucleon)Half-life:55.9(12) μsDecay constant λ:12399.770671913 s^-1Specific activity α:4.242793500975 × 10⁺²⁵ Bq g^-1
1.146700946209 × 10⁺¹⁵ Ci g^-1Spin and parity:
(nuclear angular momentum)(19/2-)

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
¹⁷⁷Hf		stable	7/2-
^177m1Hf	1315.4502(8) keV	1.09(5) s	23/2+
^177m3Hf	2740.02(15) keV	51.4(5) min	37/2-

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 105) and isobaric (same nucleon number A = 177) with Hafnium-177m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 105	Isobar A = 177
63	¹⁶⁸Eu
64	¹⁶⁹Gd
65	¹⁷⁰Tb
66	¹⁷¹Dy
67	¹⁷²Ho
68	¹⁷³Er	¹⁷⁷Er
69	¹⁷⁴Tm	¹⁷⁷Tm
70	¹⁷⁵Yb	¹⁷⁷Yb
71	¹⁷⁶Lu	¹⁷⁷Lu
72	¹⁷⁷Hf	¹⁷⁷Hf
73	¹⁷⁸Ta	¹⁷⁷Ta
74	¹⁷⁹W	¹⁷⁷W
75	¹⁸⁰Re	¹⁷⁷Re
76	¹⁸¹Os	¹⁷⁷Os
77	¹⁸²Ir	¹⁷⁷Ir
78	¹⁸³Pt	¹⁷⁷Pt
79	¹⁸⁴Au	¹⁷⁷Au
80	¹⁸⁵Hg	¹⁷⁷Hg
81	¹⁸⁶Tl	¹⁷⁷Tl
82	¹⁸⁷Pb
83	¹⁸⁸Bi
84	¹⁸⁹Po
85	¹⁹⁰At