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Properties of dibaryons in nuclear medium

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Abstract

Properties of six-quark dibaryons in a nuclear medium are considered by the example of \(A=6\) nuclei within the three-cluster \(\alpha +2N\) model. Dibaryon production in nuclei leads to the appearance of a three-body force between the dibaryon and nuclear core. This non-conventional scalar force is shown to provide an additional attractive contribution to the three-body binding energy. This three-body contribution improves noticeably agreement between theoretical results and experimental data for the majority of observables. The most serious difference between the traditional NN-force models and the dibaryon-induced model is found for the nucleon momentum distribution, the latter model providing a strong enrichment of the high-momentum components, both for the \(^6\)Li and the \(^6\)He cases.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: All data generated or analysed during this study are included in this published article.]

Notes

  1. According to a recent study [19] of the low-energy analyzing powers, the values of \(A_y\), \(iT_{11}\) and \(T_{20}\) can be explained only by varying the contact P-wave terms within the \(\hbox {N}^3\)LO and \(\hbox {N}^4\)LO approximations.

  2. The previous version of the three-body model for the \(^{6}\)Li nucleus [54] was only schematic and could not lead to quantitative and consistent predictions.

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Acknowledgements

The authors are grateful to Prof. Elena Zemlyanaya for her help in preparing the computer code used to obtain the numerical results presented in the paper. The work has been partially supported by the Russian Foundation for Basic Research, grants Nos. 19-02-00011 and 19-02-00014.

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Authors and Affiliations

  1. Laboratory of Information Technologies, Joint Institute for Nuclear Research, 6 Joliot-Curie, Dubna, Moscow Region, 141980, Russia

    M. Kakenov

  2. Institute of Nuclear Physics, 1 Ibragimova Street, 050032, Almaty, Kazakhstan

    M. Kakenov

  3. Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, 1(2) Leninskie Gory, Moscow, 119991, Russia

    V. I. Kukulin & V. N. Pomerantsev

  4. L.N.Gumilyov Eurasian National University, 2 Satpaev Str, 010008, Nur-Sultan, Kazakhstan

    O. Bayakhmetov

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  1. M. Kakenov
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  2. V. I. Kukulin
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  3. V. N. Pomerantsev
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  4. O. Bayakhmetov
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Correspondence to V. N. Pomerantsev.

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Communicated by Vittorio Somà

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Kakenov, M., Kukulin, V.I., Pomerantsev, V.N. et al. Properties of dibaryons in nuclear medium. Eur. Phys. J. A 56, 266 (2020). https://doi.org/10.1140/epja/s10050-020-00272-z

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