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SUMMARY:Atomic electron shell excitations in neutrinoless double β decay
DTSTART;VALUE=DATE-TIME:20241025T143000Z
DTEND;VALUE=DATE-TIME:20241025T144500Z
DTSTAMP;VALUE=DATE-TIME:20261014T222846Z
UID:indico-contribution-4266@cern.ch
DESCRIPTION:Speakers: Kirill Tyrin (National Research Centre "Kurchatov In
 stitute")\nThe excitation of electron shell of a daughter atom in a neutri
 noless double β decay causes change in shape of the total energy peak of 
 β particles at the end of the energy spectrum. This fact has important im
 plications for modelling the energy spectrum of β particles\, which is se
 nsitive to the mass and Majorana nature of the neutrino. We report the ove
 rlap amplitudes between the parent atom and the daughter ion for eleven at
 oms whose two-neutrino double β decay has been observed experimentally. F
 or these atoms\, the mean excitation energy and its variance were calculat
 ed using several methods. We performed Dirac-Hartree-Fock computations bas
 ed on the GRASP software package. The results were compared with calculati
 ons performed within the non-relativistic Roothaan-Hartree-Fock model\, as
  well as with estimates obtained using the Thomas-Fermi and Thomas-Fermi-D
 irac-Weizsäcker models. In about a quarter of the cases\, when the electr
 on shell structure is inherited from the parent atom\, a transition to the
  ground state or the lowest-energy excited state occurs. De-excitation of 
 the daughter ion in the latter scenario is accompanied by the emission of 
 photons in the ultraviolet range\, which can serve as an auxiliary signatu
 re of double-β decay. \n\nThe results are reported in\n\n[1] M.I. Krivoru
 chenko\, K.S. Tyrin\, and F.F. Karpeshin\, JETP Lett. 117\, 884 (2023).\n\
 n[2] M.I. Krivoruchenko\, K.S. Tyrin\, and F.F. Karpeshin\, JETP Lett. 118
 \, 470 (2023).\n\n[3] K. S. Tyrin\, M. I. Krivoruchenko\, arXiv:2408.00068
  (2024).\n\nhttps://indico.particle.mephi.ru/event/436/contributions/4266/
LOCATION: Petrovskiy 1
URL:https://indico.particle.mephi.ru/event/436/contributions/4266/
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