Measurement of the lifetime of heavy hypernuclei produced in the bombardment of Bi with protons

Kulessa, P.; Pysza, K.; Zychor, I.; Rudy, Z.; Ohm, H.; Kamys, B.; Hartmann, Michael; Cassing, W.; Koch, H.; Strzalkowski, A.; Hodde, H.; Borgs, W.; Maiera, R.; Prasuhn, D.; Matoba, M.; Schult, O.W.B.

doi:10.1016/s0375-9474(98)00285-1

Cited by 5 publications

(5 citation statements)

References 14 publications

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“…data from the KEK-E307 experiment [189], the open circles are previous data from counter experiments in which the formation of the Hypernucleus was explicitly identified [166,167,170], the open diamonds are data obtained at COSY on heavy nuclei, Bi and U, [229,230] [176]. The open square shows a result from the direct quark mechanism [223] for a Λ in nuclear matter.…”

Section: Nmwd: Total Decay Widthmentioning

confidence: 98%

“…Mass number dependence of the NMWD rate measured before 2001. Full circles are data from the KEK-E307 experiment [189], open circles are previous data from counter experiments in which the formation of the Hypernucleus was explicitly identified [166,167,170], open diamonds are data obtained at COSY on heavy nuclei, Bi and U, [229,230]. Solid, dot-dashed and dashed lines correspond, respectively, to calculations by Refs.…”

Section: Nmwd: Total Decay Widthmentioning

confidence: 98%

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Strangeness nuclear physics: a critical review on selected topics

2012

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Selected topics in strangeness nuclear physics are critically reviewed. This includes production, structure and weak decay of Λ-Hypernuclei, theK nuclear interaction and the possible existence ofK bound states in nuclei. Perspectives for future studies on these issues are also outlined. PACS. 21.80.+a Hypernuclei -25.80.Pw Hyperon-induced reactions -21.60.-n Nuclear structure models and methods -21.45.+v Few-body Systems -25.80.Nv Kaon-induced reactions -13.75.Jz Kaon-baryon interactions

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Section: Nmwd: Total Decay Widthmentioning

confidence: 98%

Section: Nmwd: Total Decay Widthmentioning

confidence: 98%

Strangeness nuclear physics: a critical review on selected topics

2012

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“…Figure 10 shows the mass-number dependence of the nonmesonic weak decay widths derived by the present and previous experiments. There are experimental data of lifetime measurement for very heavy hypernuclei in the mass region of A ∼ 200 with recoil shadow method on p + Bi and p + U reactions at COSY, although the strangeness production was not explicitly identified [39,40]. The plotted data around A ∼ 200 in Fig.…”

Section: A Mesonic Decay Widthsmentioning

confidence: 99%

“…The mesonic decay releases energy of Q free 40 MeV, corresponding to a momentum of about 100 MeV/c in the center-of-mass system (c.m.) for the emitted nucleon and pion.…”

Section: Introductionmentioning

confidence: 99%

Mesonic and nonmesonic weak decay widths of medium-heavyΛhypernuclei

et al. 2005

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We have measured the energy spectra of pions and protons emitted in the weak decay of 12 C, 28 Si, and Fe hypernuclei produced via the (π + , K + ) reaction. The decay widths of the π − mesonic decay ( → pπ − ) and the nonmesonic decay ( N → NN) were extracted. The present results demonstrate an increase of the mesonic decay width due to a distortion of the pion wave function in nuclear medium for the first time. The ratios of the neutron-to proton-induced nonmesonic decay widths, n ( n → nn)/ p ( p → np), were evaluated by a direct comparison of the measured proton energy spectra with the calculated ones. No theoretical calculation which has been proposed so far can simultaneously account for both the nonmesonic decay widths and the n / p ratios in the present data.

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“…10 shows the mass-number dependence of the nonmesonic weak decay widths derived by the present and previous experiments. There are experimental data of lifetime measurement for very heavy hypernuclei in the mass region of A ∼ 200 with recoil shadow method on p+Bi and p+U reactions at COSY, although the strangeness production was not explicitly identified [39] [40]. The plotted data around A ∼ 200 in Fig.…”

Section: Bmentioning

confidence: 99%

The Mesonic and Nonmesonic Weak Decay Widths of Medium-Heavy Λ Hypernuclei

Sato¹

2004

Electrophotoproduction of Strangeness on Nucleons and Nuclei

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We have measured the energy spectra of pions and protons emitted in the weak decay of 12 Λ C, 28 Λ Si, and Λ Fe hypernuclei produced via the (π + , K + ) reaction. The decay widths of the π − mesonic decay (Λ → pπ − ) and the nonmesonic decay (ΛN → N N ) were extracted. The present results demonstrate an increase of the mesonic decay width due to a distortion of the pion wave function in nuclear medium for the first time. The ratios of the neutron-to proton-induced nonmesonic decay widths, Γ n (Λn → nn)/Γ p (Λp → np), were evaluated by a direct comparison of the measured proton energy spectra with the calculated ones. No theoretical calculation which has been proposed so far can simultaneously account for both the nonmesonic decay widths and the Γ n /Γ p ratios in the present data.

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Measurement of the lifetime of heavy hypernuclei produced in the bombardment of Bi with protons

Cited by 5 publications

References 14 publications

Strangeness nuclear physics: a critical review on selected topics

Strangeness nuclear physics: a critical review on selected topics

Mesonic and nonmesonic weak decay widths of medium-heavyΛhypernuclei

The Mesonic and Nonmesonic Weak Decay Widths of Medium-Heavy Λ Hypernuclei

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