Nuklida · stabil · alami

Barium-136 (¹³⁶Ba)

Barium-136 (¹³⁶Ba) adalah isotop stabil barium dengan 56 proton dan 80 neutron (nomor massa 136). Kelimpahan alaminya 0.0785(24).

Data nuklida

Unsur: Barium (Ba, Z = 56)
Nomor massa (A): 136
Proton (Z): 56
Neutron (N): 80
Massa atom: 135.904575800 ± 0.000000262 u
Waktu paruh: Stabil
Mode peluruhan: Tidak meluruh
Kelimpahan alami: 0.0785(24)
Tahun penemuan: 1932
Sumber data: IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem

Because molecules, atoms, and ions of the stable isotopes of barium possess slightly different physical and chemical properties, they can be fractionated during physical, chemical, and biological processes, giving rise to variations in isotopic abundances and in atomic weights. von Allmen et al. observed barium isotopic fractionation in the global barium cycle (Fig. IUPAC.56.1). High-precision barium isotope measurements reveal differences of up to 25 parts per million in the isotope-amount ratio n(137Ba)/n(136Ba) and 60 parts per million in the n(138Ba)/n(136Ba) ratio between chondrites and the Earth. These differences probably arose from incomplete mixing of nucleosynthetic material in the solar nebula. Barium isotopes may be the decay products of now-extinct 135Cs (with a half-life of about 1.6×106 years), which is thought to be a nucleosynthetic component. Chondritic meteorites have a slight excess of supernova-derived material as compared to Earth, demonstrating that the solar nebula was not perfectly homogenized upon formation (Fig. IUPAC.56.1),,.