The problem of the anomaly in the beta decay solved
V.M. GorozhankinLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationV. G. KalinnikovLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationA. Kovalı́kLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationА. А. СолнышкинLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationA.F. NovgorodovLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationN.A. LebedevLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationN. Yu. KotovskijLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationE. YakushevLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationMohamed MahmoudLaboratory of Nuclear Problems, JINR, 141980 Dubna, Moscow Region, Russian FederationM. Ryšavý
1996en
ABI
Annotatsiya
Conversion electron and gamma ray measurements with electrostatic and Si(Li), spectrometers, respectively, revealed the existence of the eV E1 nuclear transition in with the M2 admixture less than . The full intensity of the transition was determined to be almost 100% per decay. Existence of the 7.7 keV transition in solves the problem of the `anomalously fast' first-forbidden EC, transition in decay and introduces substantial changes into the accepted decay scheme of . Energies of the 24.4(2) and 71.95(5) keV transitions in were also improved to and eV, respectively. For the 11.4(1) keV M1 transition in , we improved the transition energy as eV and determined the E2 admixture to be less than 0.6%.
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