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SUMMARY:The production of trineutron states after stopped pion absorption 
 by 9Be nuclei
DTSTART;VALUE=DATE-TIME:20261030T143000Z
DTEND;VALUE=DATE-TIME:20261030T144500Z
DTSTAMP;VALUE=DATE-TIME:20261019T055010Z
UID:indico-contribution-6358@cern.ch
DESCRIPTION:Speakers: Boris Chernyshev (National Research Nuclear Universi
 ty MEPhI)\nThe search for the trineutron $^{3}$n was carried out in the re
 actions of stopped pion absorption $^{9}Be(\\pi^{-}\,d^{4}He)^{3}n$ and $^
 {9}Be(\\pi^{-}\,t^{3}He)^{3}n$. Correlation measurements of the missing ma
 ss spectra were performed using the multilayer semiconductor spectrometer 
 (M. G. Gornov et al.\, Nucl. Instrum. Methods Phys. Res. A\, 446\, 461 (20
 00)). No indications of the existence of bound states of the trineutron we
 re obtained in the measurements of both reactions. Near the threshold ($E_
 {r} \\ge 0 MeV$)\, an excess of the experimental spectrum over the calcula
 ted one was observed. However\, the insufficient statistics of the data in
  this region did not allow the determination of the resonance parameters o
 f this excess. In both reactions\, indications were obtained of the existe
 nce of two relatively narrow ($\\Gamma \\cong 3 MeV$) resonance states wit
 h $E_{r} \\cong 6$ and 14 MeV. Several theoretical works [F. M. Marqués a
 nd J. Carbonell\, EPJA\, 57\, 105 (2021)] predict the existence of such hi
 gh lying 3n states with significantly larger widths (Γ $\\sim$ 10 MeV).\n
 \nhttps://indico.particle.mephi.ru/event/626/contributions/6358/
LOCATION:Sevastopol Hotel
URL:https://indico.particle.mephi.ru/event/626/contributions/6358/
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