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First direct search for \(2 \epsilon\) and \( \epsilon\beta^{+}\) decay of 144Sm and \(2 \beta^{-}\) decay of 154Sm

  • Regular Article - Experimental Physics
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Abstract.

The first direct search for the double electron capture (\( 2\epsilon\)) and the electron capture with positron emission (\( \epsilon\beta^+\)) in 144Sm to the ground state and to the excited levels of 144Nd was realized by measuring --over 1899h-- a 342g sample of highly purified samarium oxide (Sm2O3) with the ultra-low background HP-Ge \(\gamma\) spectrometer GeCris (465cm3) at the STELLA facility of the Gran Sasso National Laboratory (LNGS). No effect was observed and half-life limits were estimated at the level of \( T_{1/2} \sim (0.1 - 1.3) \times 10^{20}\) yr (90% C.L.). Moreover, for the first time half-life limits of the double beta (\( 2\beta^-\)) decay of 154Sm to several excited levels of 154Gd have been set; they are at the level of \( T_{1/2} \sim (0.06 - 8) \times 10^{20}\) yr (90% C.L.).

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Authors and Affiliations

  1. INFN sezione Roma “Tor Vergata”, I-00133, Rome, Italy

    P. Belli, R. Bernabei, V. Caracciolo, R. Cerulli & A. Di Marco

  2. Dipartimento di Fisica, Università di Roma “Tor Vergata”, I-00133, Rome, Italy

    P. Belli, R. Bernabei, V. Caracciolo, R. Cerulli, A. Di Marco & O. G. Polischuk

  3. Institute for Nuclear Research, National Academy of Sciences of Ukraine, 03028, Kyiv, Ukraine

    R. S. Boiko, F. A. Danevich, B. N. Kropivyansky, D. V. Poda, O. G. Polischuk & V. I. Tretyak

  4. National University of Life and Environmental Sciences of Ukraine, 03041, Kyiv, Ukraine

    R. S. Boiko

  5. INFN sezione Roma, I-00185, Rome, Italy

    F. Cappella & A. Incicchitti

  6. Dipartimento di Fisica, Università di Roma “La Sapienza”, I-00185, Rome, Italy

    F. Cappella & A. Incicchitti

  7. INFN, Laboratori Nazionali del Gran Sasso, I-67100, Assergi (AQ), Italy

    M. Laubenstein & S. Nisi

  8. CSNSM, Univ. Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France

    D. V. Poda

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  1. P. Belli
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  2. R. Bernabei
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Corresponding author

Correspondence to R. Bernabei.

Additional information

Communicated by K. Blaum

Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated during this study are contained in this published article.]

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Belli, P., Bernabei, R., Boiko, R.S. et al. First direct search for \(2 \epsilon\) and \( \epsilon\beta^{+}\) decay of 144Sm and \(2 \beta^{-}\) decay of 154Sm. Eur. Phys. J. A 55, 201 (2019). https://doi.org/10.1140/epja/i2019-12911-3

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  • DOI: https://doi.org/10.1140/epja/i2019-12911-3

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