Nuklida · stabil · alami

Rutenium-100 (¹⁰⁰Ru)

Rutenium-100 (¹⁰⁰Ru) adalah isotop stabil rutenium dengan 44 proton dan 56 neutron (nomor massa 100). Kelimpahan alaminya 0.1260(7).

Data nuklida

Unsur: Rutenium (Ru, Z = 44)
Nomor massa (A): 100
Proton (Z): 44
Neutron (N): 56
Massa atom: 99.904210460 ± 0.000000367 u
Waktu paruh: Stabil
Mode peluruhan: Tidak meluruh
Kelimpahan alami: 0.1260(7)
Tahun penemuan: 1931
Sumber data: IAEA Atomic Mass Data Center (NUBASE) and IUPAC CIAAW, via PubChem

100Ru is the product of a rare (and hence very long-lived) nuclear decay process from the double beta decay of 100Mo. A careful measurement of the half-life for this decay, which is 7.1×1018 years, can be used to place an upper limit on the mass of the electron neutrino, which is a neutral and weakly interacting subatomic particle first postulated by Wolfgang Pauli in 1930. Ruthenium and molybdenum share many similarities. They both have seven isotopes (96, 98, 99, 100, 101, 102, and 104 for ruthenium and 92, 94, 95, 96, 97, 98, and 100 for molybdenum), and their isotopes are formed by the same nucleosynthesisp-processes, r-processes, and s-processes, namely, p, r, s and r, s only, s and r, s and r, and r, respectively. The molybdenum and ruthenium isotopic composition of most meteorites lie along a mixing line (Fig. IUPAC.44.1). The ruthenium and molybdenum of silicates in the Earth also lie on this line, which supports the hypothesis that the Earth accreted homogeneously. That is, the feeding zone of the Earth did not change substantially over time as both the bulk of the Earth and the late veneer accreted from material having the same ruthenium-molybdenum isotopic reservoir.