The Excited States in ¹⁰⁰Ru Studied by the Decay of ¹⁰⁰Rh

Abstract

The excited states of ¹⁰⁰Ru were reinvestigated by the decay of ¹⁰⁰Rh. Singles and coincidence (γ–γ, e–γ and γ–γ–γ) gamma spectra were studied with a Ge(Li), two or three NaI(Tl) detectors and a magnetic beta spectrometer. Observed gamma rays were those of 0.447(13), 0.540(100), 0.589(7), 0.67(weak), 0.75(∼4), 0.822(30), 1.035(4), 1.109(21), 1.34(8), 1.362(24), 1.555(28), 1.927(13), 2.375(41), 2.526(4) and 0.511 annihilation radiation (11), where the numbers are energies in MeV and those in parentheses are intensities; the gamma ray of 2.526 MeV was newly found with both a Ge(Li) and a NaI(Tl) detectors. Gamma-gamma angular correlation was studied for almost all coincident gamma-ray pairs. The excited states of ¹⁰⁰Ru deduced by the above experiment are as follows: 0.540(2⁺), 1.362(2⁺), 1.88(3⁺ or 2⁺), 2.11(?), 2.467(2⁻), 2.915(2⁻) and 3.066(?), where the numbers are excitation energies in MeV.