Speaker
Description
The SS-HORSE–NCSM method [1] is generalized to the case of democratic decay into an odd number of fragments. This method is applied to the search for resonances in three-neutron system (trineutron) using ab initio No-Core Shell Model [2] calculations with realistic nucleon-nucleon potentials [3-5].
We predict two overlapping trineutron resonances with spin-parities $3/2^−$ and $1/2^−$ which energies $E_r$ and widths $\Gamma$ are nearly the same. For the Daejeon16 interaction [3], we obtain $E_r= 0.5$ MeV and $\Gamma= 1$ MeV; for JISP16 [4] and the chiral interaction of the effective field theory N3LO [5], regularized by the SRG transformation [6] with the parameter $\Lambda=2$ fm$^{-1}$ these values are smaller: $E_r= 0.35$ MeV and $\Gamma= 0.7$ MeV, respectively. On the other hand, these resonances are not supported by $NN$ interactions of chiral effective field theory without SRG modification.
Our results are in line with the conclusions of Ref. [7] predicting the trineutron resonance at lower energy than the tetraneutron resonance [8, 9].
References
[1] A. M. Shirokov et al. // Phys. Rev. C. — 2016. — Vol. 94. — P. 064320.
[2] B. R. Barrett, P. Navrátil, J. P. Vary // Prog. Part. Nucl. Phys. — 2013. — Vol. 69. — P. 131.
[3] A. M. Shirokov et al. // Phys. Lett. B — 2016. — Vol. 761. — P. 87.
[4] A. M. Shirokov et al. // Phys. Lett. B — 2007. — Vol. 644. — P. 33.
[5] D. R. Entem, R. Machleidt // Phys. Rev. C — 2003. — Vol. 68. — 04100(R).
[6] S. D. Glazek, K. G. Wilson // Phys. Rev. D — 1993. — Vol. 48. — P. 5863.
[7] J. G. Li et al. // Phys. Rev. C — 2019. — Vol. 100. — 054313.
[8] A. M. Shirokov et al. // Phys. Rev. Lett. — 2016. — Vol. 117. — 182502.
[9] A. M. Shirokov et al. // AIP Conf. Proc. — 2018. — Vol. 2038. — 020038.
| Section | Nuclear structure: theory and experiment |
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