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β-decay rates of121–131Cs have been calculated in the framework of the neutron-proton interacting boson-fermion model (IBFM-2). For odd-Anuclei, the decay operator can be written in a relatively simple form in termsof the one-nucleon transfer operator. Previous studies ofβdecay in IBFM-2 were based on a transfer operatorobtained by using the number operator approximation (NOA). In this work a new form of the one-nucleon transferoperator, derived microscopically without the NOA approximation, is used. The results from both approaches arecompared and show that the deviation from experimental data is reduced without using the NOA approximation.Indications about the renormalization of the Fermi and Gamow-Teller matrix elements are discussed. This isa further step toward a more complete description of low-lying states in medium and heavy nuclei which isnecessary to compute reliable matrix elements in studies of current active interest such as double-βdecay orneutrino absorption experimentsMinisterio de Economía y Competitividad (España)  FIS2014-53448-C2-1-PConsejería de Economía, Innovación, Ciencia y Empleo de la Junta de Andalucía FQM-160 P11-FQM-763

physical review. c

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay rates of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>Cs</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>121</mml:mn><mml:mo>–</mml:mo><mml:mn>131</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math>in the microscopic interacting boson-fermion model

β-decay rates ofCs121–131in the microscopic interacting boson-fermion model