Prediction for a Four-Neutron Resonance

Shirokov, A. M.; Papadimitriou, Georgios I.; Mazur, A. I.; Mazur, I. A.; Roth, Robert; Vary, James P.

doi:10.1103/physrevlett.117.182502

Cited by 74 publications

(44 citation statements)

References 35 publications

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“…Consequently, we suppose that trineu-tron should be more likely to be observed experimentally than tetraneutron. We also compared our calculations The corresponding references are QMC: [14], NCSM2016: [13] and NCSM2018: [20]. The experimental datum is from Ref.…”

Section: Calculations and Discussionmentioning

confidence: 99%

“…The widths of the eigenstates obtained in NCGSM take all particleemission channels into account, so that they are total decay widths. Conversely, other methods, as those using Faddeev-Yakubovsky equations [17] and NCSM calculations [13], need to consider all partial decay processes to calculate the total decay width.…”

Section: The Methodsmentioning

confidence: 99%

“…The calculations of Ref. [13][14][15] showed that multi-neutron systems are sensitive neither to various realistic interactions, in the presence or absence of three-body forces, nor to the momentum cutoff present in renormalization group methods. In this paper, we will then present a nearly exact study of trineutron and tetraneutron systems employing ab-initio NCGSM [15,22].…”

Section: Introductionmentioning

confidence: 99%

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Ab initio no-core Gamow shell-model calculations of multineutron systems

Michel

et al. 2019

Phys. Rev. C

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The existence of multi-neutron systems has always been a debatable question. Indeed, both internucleon correlations and a large continuum coupling occur in these states. We then employ the ab-initio no-core Gamow shell model to calculate the resonant energies and widths of the trineutron and tetraneutron systems with realistic interactions. Our results indicate that trineutron and tetraneutron are both unbound and bear broad widths. The calculated energy and width of tetraneutron are also comparable with recent experimental data. Moreover, our calculations suggest that the energy of trineutron is lower than that of tetraneutron, while its resonance width is also narrower. This strongly suggests that trineutron is more likely to be experimentally observed than tetraneutron. We thus suggest experimentalists to search for trineutron at low energy.

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Section: Calculations and Discussionmentioning

confidence: 99%

Section: The Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ab initio no-core Gamow shell-model calculations of multineutron systems

Michel

et al. 2019

Phys. Rev. C

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“…Considering possible systematic uncertainties in the E906 data and in the SMM calculations, even for B( 4 ΛΛ n) = 1 MeV the signal strength of N 2 /N total = 0.16 is still compatible with the data. As mentioned before, the initial excitation energy of the 10 ΛΛ Li * depends on the binding energy of the Ξ − at the time 7 of conversion. We, therefore, repeated the SMM calculations for an excitation energy of 25 MeV.…”

Section: Can a Neutralmentioning

confidence: 79%

“…In case of the stopped Ξ − process a capture × conversion probability for producing excited ΛΛ nuclear systems of 5% was taken into account. The probabilities in the last 5 columns are multiplied by 10 6 Λ He would contribute at p π−L ≈ 108 MeV/c. In early emulsion studies, however, no two-body decays of 6 Λ He were found, although the decays of the neighboring isotopes 5 Λ He and 7 Λ He have been seen [42], indicating the potential sensitivity of these experiments to 6 Λ He → 6 Li+π − decays.…”

Section: The E906 Puzzlementioning

confidence: 99%

Has the neutral double hypernucleus nΛΛ4 been observed?

et al. 2019

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The BNL-AGS E906 experiment was the first fully electronic experiment to produce and study double hypernuclei with large statistics. Two dominant structures were observed in the correlated π − -π − momentum matrix at (p π−H ,p π−L ) = (133,114) MeV/c and at (114,104) MeV/c. In this work we argue that the interpretation of the structure at (133,114) MeV/c in terms of 3 Λ H+ 4 Λ H pairs is questionable. We show, that neither a scenario where these singe-Λ hypernuclei are produced after capture of a stopped Ξ − by a 9 Be nucleus nor interactions of energetic Ξ − with 9 Be nuclei in the target material can produce a sufficient amount of such twin pairs. We have therefore explored the conjecture of Avraham Gal that decays of the 4 ΛΛ n may be responsible for the observed structure. Indeed, the inclusion of 4 ΛΛ n with a two-body π − branching ratio of 50% in a statistical multifragmentation model allows to describe the E906 data remarkably well. On the other hand, a bound 3 Λ n nucleus would cause a striking structure in the momentum correlation matrix which is clearly inconsistent with the observation of E906.

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