Summary of the HypHI Phase 0 experiment and future plans with FRS at GSI (FAIR Phase 0)

Saito, Takehiko; Rappold, C.; Bertini, O.; Bianchin, S.; Bozkurt, V.; Geißel, H.; Kavatsyuk, M.; Kim, E.; Ma, Yue; Maas, F. E.; Minami, S.; Nakajima, D.; Nociforo, C.; Özel-Tashenov, B.; Pochodzalla, J.; Scheidenberger, C.; Yoshida, K.

doi:10.1016/j.nuclphysa.2016.05.011

Cited by 19 publications

(10 citation statements)

References 39 publications

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“…Evaluating the ratio Γ( 3 Λ n)/Γ Λ for the choiceq = q Λ one obtains Γ( 3 Λ n)/Γ Λ ≈ 1.114 × 0.641 = 0.714, where the factor 1.114 follows from the difference between E 3N (q Λ ) and E N (q Λ ) in the phase space factors, giving rise to an estimated 3 Λ n lifetime of τ( 3 Λ n) ≈ 368 ps, which should hold up to a few percent contribution from the π 0 decay branch. This lifetime is considerably longer than 181 +30 −24 ±25 ps or 190 +47 −35 ±36 ps deduced from the ndπ − and tπ − alleged decay modes of 3 Λ n [57,61], providing a strong argument against the conjectured stability of 3 Λ n.…”

Section: Charge Symmetry Breakingmentioning

confidence: 75%

Old & new in strangeness nuclear physics

Gal¹

2019

AIP Conference Proceedings

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Several persistent problems in strangeness nuclear physics are discussed in this opening talk at HYP2018, Norfolk VA, June 2018: (i) the 3 Λ H, and 3 Λ n if existing, lifetimes; (ii) charge symmetry breaking in Λ hypernuclei; (iii) the overbinding of 5 Λ He which might be related to the hyperon puzzle in neutron stars; and (iv) does Λ * (1405) survive in strange hadronic matter? Progress in Strangeness Nuclear Physics which 50 years ago consisted mostly of Hypernuclear Physics, with data collected exclusively in nuclear emulsions and bubble chambers, has been stepped up significantly with the advent of counter production experiments [1]. The left panel of Fig. 1 shows a 89 Y(π + , K + ) spectrum from KEK [2], exhibiting distinct Λ single-particle orbits in 89 Λ Y down to the ground-state (g.s.) s Λ orbit, a feature unparalleled in ordinary nuclei and hence termed "a textbook example of a shell model at work" [3].The right panel of Fig. 1 presents a compilation of most of the Λ hypernuclear binding energies (B Λ ) measured across the periodic table as a function of A −2/3 and as fitted by a simple 3-parameter Woods-Saxon (WS) potential. The Λ nuclear potential well depth D Λ in this simple-minded fit is 30 MeV, compared to 27.8±0.3 MeV from the 1988 first theoretical analysis [3] of the AGS (π + , K + ) data [4]. Although the robustness of extrapolating to A → ∞ is primarily owing to the (π + , K + ) production data in medium-weight and heavy nuclei, it is worth noting that D Λ was derived more than 50 years ago, to less accuracy of course, from π − decays of heavy spallation hypernuclei formed in silver and bromine emulsions [5,6]: 27±3 MeV (1964) and 27.2±1.3 MeV (1965), respectively.

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Section: Charge Symmetry Breakingmentioning

confidence: 75%

Old & new in strangeness nuclear physics

Gal¹

2019

AIP Conference Proceedings

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“…Hence Γ( 3 Λ n)/Γ Λ ≈ 1.114 × 0.641 = 0.714 [16], where the factor 1.114 follows from a difference between recoil energies in the 3 Λ n and Λ phase space factors, and the factor 0.641 is the free-space Λ → p + π − fraction of the total Λ → N + π weak decay rate. This corresponds to a 3 Λ n lifetime estimate of τ( 3Λ n)≈368 ps, considerably longer than 181 +30 −24 ±25 ps or 190 +47 −35 ±36 ps deduced from the ndπ − and tπ − alleged 3 Λ n decay modes [22,26], and thereby questioning the conjectured stability of 3 Λ n.…”

Section: Introductionmentioning

confidence: 86%

Recent progress on few-body hypernuclei

Gal

2022

EPJ Web Conf.

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Few-body Λ hypernuclei provide valuable information towards understanding strange matter. Recent experimental progress by the STAR Collaboration at the RHIC facility and by the ALICE Collaboration at the LHC has been matched by theoretical progress reviewed here: (i) lifetimes of the hypertriton Λ3H, Λ3n if particle-stable, Λ4H and Λ4He and their charge symmetry breaking, and (ii) the onset of ΛΛ hypernuclear binding.

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“…Hence Γ( 3Λ n)/Γ Λ ≈ 1.114 × 0.641 = 0.714 [16], where the factor 1.114 follows from a difference between recoil energies in the 3 Λ n and Λ phase space factors, and the factor 0.641 is the free-space Λ → p + π − fraction of the total Λ → N + π weak decay rate. This corresponds to a 3 Λ n lifetime estimate of τ( 3Λ n)≈368 ps, considerably longer than 181 +30 −24 ±25 ps or 190 +47 −35 ±36 ps deduced from the ndπ − and tπ − alleged 3 Λ n decay modes [22,26], and thereby questioning the conjectured stability of 3 Λ n.…”

Section: Introductionmentioning

confidence: 86%

Progress report on few-body hypernuclei

Gal¹

2020

Proceedings of the 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon

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Few-body Λ hypernuclei provide valuable information towards understanding strange matter. Recent experimental progress by the STAR Collaboration at the RHIC facility and by the ALICE Collaboration at the LHC has been matched by theoretical progress reviewed here: (i) lifetimes of the hypertriton 3 Λ H, 3 Λ n if particle-stable, 4 Λ H and 4 Λ He and their charge symmetry breaking, and (ii) the onset of ΛΛ hypernuclear binding.

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Summary of the HypHI Phase 0 experiment and future plans with FRS at GSI (FAIR Phase 0)

Cited by 19 publications

References 39 publications

Old & new in strangeness nuclear physics

Old & new in strangeness nuclear physics

Recent progress on few-body hypernuclei

Progress report on few-body hypernuclei

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