Speaker
Description
Searches for bound or resonant state in the system of 4 neutrons (tetraneutron) have been started more than half a century ago. Theory completely excludes the bound tetraneutron. Numerous theoretical studies allowing for the continuum with modern NN interactions exclude also low-lying tetraneutron resonance narrow enough to be detected experimentally. A notable exception is the predictions of the tetraneutron resonance in Refs. [1-3] using softened realistic NN interactions. The first observation of this resonance was reported in Ref. [4] with marginal statistics of 4 events and later confirmed in Ref. [5] in the 1H(8He,pα) experiment with a reasonable statistical significance. However, some authors are skeptical (see, e. g., Refs. [6-8]) about the interpretation that the tetraneutron resonance per se was observed in Refs. [4,5]. For example, the low-energy peaks were observed in reactions 2H(8He,6Li)4n and 2H(8He,3He)7H→3H+4n in Ref. [8] at energies consistent with the tetraneutron resonance observed in Ref. [5] which were, however, interpreted as a manifestation of the 8He structure and the reaction mechanism.
If the tetraneutron resonance do really exists, we should expect an existing of its isospin analogues in excited T=2 resonant states in 4H, 4He, 4Li and in the system of 4 protons (tetraproton). Observation of these resonances can serve as a confirmation of the results and their interpretation of Refs. [4,5]. We will also discuss the possibilities of observations of these T=2 resonances in decays of excited states of heavier nuclei.
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| Section | Nuclear structure: theory and experiment |
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