Abstract
We have performed microscopic cluster studies of light∑-hypernuclei based on effective nucleon-nucleon and two different sigma-nucleon interactions. Our calculation confirms a bound 0+ state in 4 ∑ He and 4 ∑ H, but reveals no evidence for levels in other partial waves. We have investigated the 8 ∑ Li and 8 ∑ Be hypernuclei in a microscopic 3-cluster approach. For both hypernuclei, our calculation shows that the lowest levels in the partial wavesJ=0–4 are bound or quasibound states of collective nature and show a strong α 4 ∑ H and α + 4 ∑ He clustering. These levels form a sequence of states which can be well interpreted as arising from a rotatingα+ 4 ∑ H orα+ 4 ∑ He di-molecule. Our results are compared to those of similar studies for lightΛ-hypernuclei which do not show evidence for this kind of collective degrees of freedom.
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This work was financially supported by the COSY project.
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Grund, B., Langanke, K. & Warmann, T. Theoretical evidence for di-molecular rotational behaviour in the hypernuclei 8 ∑ Li and 8 ∑ Be. Z. Physik A - Hadrons and Nuclei 339, 523–530 (1991). https://doi.org/10.1007/BF01288436
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DOI: https://doi.org/10.1007/BF01288436