Bismuth-198m2

Properties and data of the isotope ¹⁹⁸Bi.

Content

General data

Name of the isotope:Bismuth-198m2; Bi-198m2Symbol:¹⁹⁸Bi or 19883BiMass number A:198 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:115Isotopic mass:197.97921(3) u (atomic weight of Bismuth-198m2)
Excitation energy: 248.5(5)+x keVNuclide mass:197.9336831 u (calculated nuclear mass without electrons)Mass excess:-19.36576 MeVMass defect:1.666732996 u (per nucleus)Nuclear binding energy:1552.55178538 MeV (per nucleus)
7.84117063 MeV (average binding energy per nucleon)Half-life:7.7(5) sDecay constant λ:0.090019114358434 s^-1Specific activity α:2.751816176412 × 10⁺²⁰ Bq g^-1
7437341017.3308 Ci g^-1Spin and parity:
(nuclear angular momentum)10-

Radioactive Decay

Half-life T_½ = 7.7(5) s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
Iso	¹⁹⁸Bi	100 %

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
¹⁹⁸Bi		10.3(3) min	(2+,3+)
^198m1Bi	+x keV	11.6(3) min	7+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 115) and isobaric (same nucleon number A = 198) with Bismuth-198m2. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 115	Isobar A = 198
70	¹⁸⁵Yb
71	¹⁸⁶Lu
72	¹⁸⁷Hf
73	¹⁸⁸Ta
74	¹⁸⁹W
75	¹⁹⁰Re	¹⁹⁸Re
76	¹⁹¹Os	¹⁹⁸Os
77	¹⁹²Ir	¹⁹⁸Ir
78	¹⁹³Pt	¹⁹⁸Pt
79	¹⁹⁴Au	¹⁹⁸Au
80	¹⁹⁵Hg	¹⁹⁸Hg
81	¹⁹⁶Tl	¹⁹⁸Tl
82	¹⁹⁷Pb	¹⁹⁸Pb
83	¹⁹⁸Bi	¹⁹⁸Bi
84	¹⁹⁹Po	¹⁹⁸Po
85	²⁰⁰At	¹⁹⁸At
86	²⁰¹Rn	¹⁹⁸Rn
87	²⁰²Fr
88	²⁰³Ra
89	²⁰⁴Ac