Fission of heavy hypernuclei formed in antiproton annihilation

Armstrong, T. A.; Bocquet, J. P.; Ericsson, Göran; Johansson, T.; Krogulski, T.; Lewis, R. A.; Malek, F.; Maurel, Marie‐Christine; Monnand, E.; Mougey, J.; Nifenecker, H.; Passaneau, J.; Perrin, Paul B.; Polikanov, S.M.; Rey-Campagnolle, M.; Ristori, C.; Smith, G. A.; Tibell, G.

doi:10.1103/physrevc.47.1957

Cited by 57 publications

(59 citation statements)

References 15 publications

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“…On the other hand, it was claimed long ago that the absorption of hyperons in the spectator regions after peripheral nuclear collisions is a promising way to produce hypernuclei [25,[34][35][36]. The special reactions associated with these processes, e.g., the hyper-fission, were under investigation too [37,38]. An important feature of peripheral collisions is that large pieces of nuclear matter around normal nuclear density at low temperature can be created in contrast to the highly-excited nuclear matter at mid-rapidity.…”

Section: Lisionsmentioning

confidence: 99%

Formation of hypernuclei in heavy-ion collisions around the threshold energies

et al. 2017

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In relativistic ion collisions there are excellent opportunities to produce and investigate hypernuclei. We have systematically studied the formation of hypernuclear spectator residues in peripheral heavy-ion collisions with the transport DCM and UrQMD models. The hyperon capture was calculated within the potential and coalescence approaches. We demonstrate that even at the beam energies around and lower than the threshold for producing Λ hyperons in binary nucleon-nucleon interactions a considerable amount of hypernuclei, including multi-strange ones, can be produced. This is important for preparation of new experiments on hypernuclei in the wide energy range.The uncertainties of the predictions are investigated within the models, and the comparison with the strangeness production measured in experiments is also performed. 21.80.+a , 25.70.Mn

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Section: Lisionsmentioning

confidence: 99%

Formation of hypernuclei in heavy-ion collisions around the threshold energies

et al. 2017

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“…The lifetimes extracted from the various experiments are all compatible with each other and also with the lifetimes determined by early antiproton annihilation experiments on Bi and U targets from ref. [11], however, much more accurate. These lifetimes correspond to a broad range in mass and charge of the produced hypernuclei (cf.…”

Section: Discussionmentioning

confidence: 99%

“…[4,5,6,7,8,50,10]). Even the total decay rate (or inverse lifetime) of heavy hypernuclei was up to very recently known only with a large error [11]. The experimental knowledge of the partial decay rates is also not satisfactory, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…of 1 GeV) concurrently with the effect (e.g. at 1.9 GeV) by operating COSY in a supercycle, which has not been possible in thep induced reactions in [11].…”

Section: Reactions and Their Decaysmentioning

confidence: 99%

“…However, the errors for τ Λ in the measurements from [31,11] are so large, that no severe constraints could be imposed on the various theoretical models for the nonmesonic decay. Bi + e 2700 ± 500 [30] Bi + p 250 +250 −100 [31] Bi + p 180± 40 (± 60) [11] Reanalysis of data from [31] U + p 130 ± 30 (± 30) [11] In order to improve the situation, experiments with 2 Heavy hypernuclei formation in p + A…”

Section: Introductionmentioning

confidence: 99%

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Lifetime of heavy hypernuclei and its implications on the weak ΛN interaction

et al. 2003

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Abstract. The lifetime of the Λ-hyperon in heavy hypernuclei -as measured by the COSY-13 Collaboration in proton -Au, Bi and U collisions at COSY-Jülich -has been analyzed to yield τΛ = (145 ± 11) ps. This value for τΛ is compatible with the lifetime extracted from antiproton annihilation on Bi and U targets, however, much more accurate. Theoretical models based on the meson exchange picture and assuming the validity of the phenomenological ∆I=1/2 rule predict the lifetime of heavy hypernuclei to be significantly larger (2 -3 standard deviations). Such large differences may indicate that the assumptions of these models are not fulfilled. A much better reproduction of the lifetimes of heavy hypernuclei is achieved in the phase space model, if the ∆I=1/2 rule is discarded in the nonmesonic Λ decay.

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