Bismuth-187m1

Properties and data of the isotope ^187m1Bi.

Contents

General data

Name of the isotope:Bismuth-187m1; Bi-187m1Symbol:^187m1Bi or 187m183BiMass number A:187 (= number of nucleons)Atomic number Z:83 (= number of protons)Neutrons N:104Isotopic mass:186.993147(11) u (atomic weight of Bismuth-187m1)
Excitation energy: 112(20) keVNuclide mass:186.9476201 u (calculated nuclear mass without electrons)Mass excess:-6.38353 MeVMass defect:1.55748192 u (per nucleus)Nuclear binding energy:1450.78506359 MeV (per nucleus)
7.7582089 MeV (average binding energy per nucleon)Half-life:0.370(20) msDecay constant λ:1873.3707582701 s^-1Specific activity α:6.065431499564 × 10⁺²⁴ Bq g^-1
1.63930581069 × 10⁺¹⁴ Ci g^-1Spin and parity:
(nuclear angular momentum)(1/2+)

Radioactive Decay

Half-life T_½ = 0.370(20) ms respectively 3.70 × 10^-4 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
α	¹⁸³Tl	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
¹⁸⁷Bi		37(2) ms	(9/2-)
^187m2Bi	252 keV	3.2 μs	(13/2+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 104) and isobaric (same nucleon number A = 187) with Bismuth-187m1. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 104	Isobar A = 187
62	¹⁶⁶Sm
63	¹⁶⁷Eu
64	¹⁶⁸Gd
65	¹⁶⁹Tb
66	¹⁷⁰Dy
67	¹⁷¹Ho
68	¹⁷²Er
69	¹⁷³Tm
70	¹⁷⁴Yb
71	¹⁷⁵Lu	¹⁸⁷Lu
72	¹⁷⁶Hf	¹⁸⁷Hf
73	¹⁷⁷Ta	¹⁸⁷Ta
74	¹⁷⁸W	¹⁸⁷W
75	¹⁷⁹Re	¹⁸⁷Re
76	¹⁸⁰Os	¹⁸⁷Os
77	¹⁸¹Ir	¹⁸⁷Ir
78	¹⁸²Pt	¹⁸⁷Pt
79	¹⁸³Au	¹⁸⁷Au
80	¹⁸⁴Hg	¹⁸⁷Hg
81	¹⁸⁵Tl	¹⁸⁷Tl
82	¹⁸⁶Pb	¹⁸⁷Pb
83	¹⁸⁷Bi	¹⁸⁷Bi
84	¹⁸⁸Po	¹⁸⁷Po