J. Barea

Publications (5)14.74 Total impact

• Article: Nuclear matrix elements for double-{\beta} decay

  J. Barea, J. Kotila, F. Iachello
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  ABSTRACT: Background: Direct determination of the neutrino mass through double-$\beta$ decay is at the present time one of the most important areas of experimental and theoretical research in nuclear and particle physics. Purpose: We calculate nuclear matrix elements for the extraction of the average neutrino mass in neutrinoless double-$\beta$ decay. Methods: The microscopic interacting boson model (IBM-2) is used. Results: Nuclear matrix elements in the closure approximation are calculated for $^{48}$Ca, $^{76}$Ge, $^{82}$Se, $^{96}$Zr, $^{100}$Mo, $^{110}$Pd, $^{116}$Cd, $^{124}$Sn, $^{128}$Te, $^{130}$Te, $^{148}$Nd, $^{150}$Nd, $^{154}$Sm, $^{160}$Gd, and $^{198}$Pt decay. Conclusions: Realistic predictions for the expected half-lives in neutrinoless double-$\beta$ decay with light and heavy neutrino exchange in terms of neutrino masses are made and limits are set from current experiments.
  01/2013;
• Article: Q value and half-lives for the double-β-decay nuclide 110Pd.

  D Fink, J Barea, D Beck, K Blaum, Ch Böhm, Ch Borgmann, M Breitenfeldt, F Herfurth, A Herlert, J Kotila, M Kowalska, S Kreim, D Lunney, S Naimi, M Rosenbusch, S Schwarz, L Schweikhard, F Simkovic, J Stanja, K Zuber
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  ABSTRACT: The 110Pd double-β decay Q value was measured with the Penning-trap mass spectrometer ISOLTRAP to be Q=2017.85(64) keV. This value shifted by 14 keV compared with the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay modes. In addition a new set of the relevant matrix elements has been calculated. The expected half-life of the two-neutrino mode was reevaluated as 1.5(6)×10(20) yr. With its high natural abundance, the new results reveal 110Pd to be an excellent candidate for double-β decay studies.
  Physical Review Letters 02/2012; 108(6):062502. · 7.37 Impact Factor
• Article: Limits on Neutrino Masses from Neutrinoless Double-βDecay

  J Barea, J Kotila, F Iachello
  Physical Review Letters 01/2012; 109(4):042501-. · 7.37 Impact Factor
• Source

  Available from: Alexander Herlert

  Article: Q-Value and Half-Lives for the Double-Beta-Decay Nuclide 110Pd

  D. Fink, J. Barea, D. Beck, K Blaum, Ch. Böhm, Ch. Borgmann, M. Breitenfeldt, F. Herfurth, A. Herlert, J. Kotila, M Kowalska, S. Kreim, D. Lunney, S. Naimi, M. Rosenbusch, S. Schwarz, L Schweikhard, F. Simkovic, J. Stanja, K Zuber
  [show abstract] [hide abstract]
  ABSTRACT: The 110Pd double-beta decay Q-value was measured with the Penning-trap mass spectrometer ISOLTRAP to be Q = 2017.85(64) keV. This value shifted by 14 keV compared to the literature value and is 17 times more precise, resulting in new phase-space factors for the two-neutrino and neutrinoless decay modes. In addition a new set of the relevant matrix elements has been calculated. The expected half-life of the two-neutrino mode was reevaluated as 1.5(6) E20 yr. With its high natural abundance, the new results reveal 110Pd to be an excellent candidate for double-beta decay studies.
  12/2011;
• Article: Neutrinoless double-β decay in the microscopic interacting boson model

  J. Barea, F. Iachello
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  ABSTRACT: We present a formalism for calculating nuclear matrix elements of double-β decay within the framework of the microscopic interacting boson model. We calculate Fermi, Gamow-Teller, and tensor matrix elements in the decay of Ge-Se-Mo-Te-Xe-Nd-Sm and compare our results with those of the shell-model (SM) and of the quasiparticle random-phase approximation (QRPA). Our results are in agreement with QRPA. We discuss simple features of the matrix elements and give a formula that allows one to estimate matrix elements in terms of the number of valence proton and neutron pairs.
  Phys. Rev. C. 79(4).