The binding energy difference between the hypernuclides4HeΛ and4HΛ

Raymund, M.

doi:10.1007/bf02735882

Cited by 31 publications

(8 citation statements)

References 30 publications

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“…The difference between these lifetimes arises mostly from the difference between the strongest partial decays which are the two-body decays to π+ 4 He, with a rate calculated reliably as ≈ 0.7Γ Λ for 4 Λ H and half of that for 4 Λ He, reflecting the π − to π 0 weights in the free Λ decay. Hence the difference between the 4 Λ H and 4 Λ He total decay rates should amount to ≈ 0.35Γ Λ , close to the ≈ 0.33Γ Λ given by the measured lifetimes (12).…”

Section: Discussionsupporting

confidence: 72%

“…Another topic discussed here, and separately by Andreas Nogga, is charge symmetry breaking (CSB) in Λ hypernuclei as demonstrated by the emulsion large value 0.35±0.04 MeV [11] of the binding energy difference B Λ ( 4 Λ He)−B Λ ( 4 Λ H) which already in 1964 was realized to be as large, 0.30±0.14 MeV [12]. If a difference of two units in N − Z induces this large binding energy difference, what should one expect going to N − Z values as large as 44 in 208 Λ Pb?…”

mentioning

confidence: 87%

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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: Discussionsupporting

confidence: 72%

mentioning

confidence: 87%

Old & new in strangeness nuclear physics

Gal¹

2019

AIP Conference Proceedings

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“…The binding energy B Λ of the Λ hyperon in the ground state of 4 Λ H was deduced from the decay pion momentum p π by Λ H from decay-pion measurements using spectrometers, pioneered by Tamura [18], or using the nuclear emulsion technique as published by Gajewski [19], Bohm [20], Jurić [3], and Raymund [21]. The binding energy value for Ref.…”

Section: Extraction Of λ Binding Energy Of 4 λ Hmentioning

confidence: 99%

Ground-state binding energy of HΛ4 from high-resolution decay-pion spectroscopy

Schulz¹,

Achenbach²,

Aulenbacher³

et al. 2016

Nuclear Physics A

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“…Motivation of our current work is to study CSB with A=4 mirror  hypernuclei. Since 1960s, emulsion experiments reported B  of 4  H and 4  He in ground state (0 + ) [1][2][3]. The combined results for B  (0 + ) of 4  H and 4  He were reported by M. Juric et al [4] to be 2.04 ± 0.04 MeV and 2.39 ± 0.03 MeV, respectively.…”

Section: Introductionmentioning

confidence: 91%