Can tetraneutron be a narrow resonance?

Abstract : The search for a resonant four-neutron system has been revived thanks to the recent experimental hints reported in Phys. Rev. Lett. 116, 052501 (2016). The existence of such a system would deeply impact our understanding of nuclear matter and requires a critical investigation. In this work, we study the existence of a four-neutron resonance in the quasi-stationary formalism using ab initio techniques with various two-body chiral interactions. We employ the No-Core Gamow Shell Model and the Density Matrix Renormalization Group method, both supplemented by the use of natural orbitals and a new identification technique for broad resonances. We demonstrate that while the energy of the four-neutron system may be compatible with the experimental value, its width must be larger than the reported upper limit, supporting the interpretation of the experimental observation as a reaction process too short to form a nucleus.
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Submitted on : Tuesday, December 6, 2016 - 3:30:23 PM
Last modification on : Wednesday, August 7, 2019 - 2:32:05 PM

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K. Fossez, J. Rotureau, N. Michel, M. Ploszajczak. Can tetraneutron be a narrow resonance?. Physical Review Letters, American Physical Society, 2017, 119, pp.032501. ⟨10.1103/PhysRevLett.119.032501⟩. ⟨in2p3-01410271⟩

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