Search for the Δ++ component in the C ground state using the C(γ,π+p) reaction

Bystritsky, V. M.; Fix, A.; Glavanakov, I. V.; Grabmayr, P.; Krechetov, Yu. F.; Saigushkin, O. K.; Schuvalov, E. N.; Табаченко, А. Н.

doi:10.1016/s0375-9474(02)00625-5

Cited by 19 publications

(12 citation statements)

References 36 publications

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“…However, there are no direct unambiguous measurements of the baryonic admixtures so far. Various processes are considered to detect ∆ admixtures in ordinary nuclei, but discrimination between ∆ components preexisting in a nucleus and ∆ baryons produced in a reaction is a difficult problem (for some recent attempts, see [7,8]). For contributions of ΛN − ΣN mixing to Λ hypernuclear binding energies, alternative dynamical pictures without explicit Σ admixtures usually exist.…”

Section: Introductionmentioning

confidence: 99%

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Lanskoy

Yamamoto

2004

Phys. Rev. C

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Properties of hypernuclei 5ΛΛ H and 5 ΛΛ He are studied in a two-channel approach with explicit treatment of coupling of channels 3 Z + Λ + Λ and α + Ξ. Diagonal ΛΛ and coupling ΛΛ − ΞN interactions are derived within G-matrix procedure from Nijmegen meson-exchange models. Bond energy ∆BΛΛ in 5 ΛΛ He exceeds significantly that in 5 ΛΛ H due to the channel coupling. Diagonal Ξα attraction amplifies the effect, which is sensitive also to Λ-core interaction. The difference of the ∆BΛΛ values can be an unambiguous signature of the ΛΛ − ΞN coupling in ΛΛ hypernuclei. However, improved knowledge of the hyperon-nucleus potentials is needed for quantitative extraction of the coupling strength from future data on the ΛΛ hypernuclear binding energies.

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Section: Introductionmentioning

confidence: 99%

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Lanskoy

Yamamoto

2004

Phys. Rev. C

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“…This kinematic region is characterized primarily by the large momentum transfers to the NB system, consisting of the free nucleon and the residual nucleus. We will consider the data from two experiments carried out at the Tomsk synchrotron in which the 12 C(γ, π − p) [7] and 12 C(γ, π + p) [8] reactions were examined. Both experiments were performed in the kinematic region of the large momentum transfers to the residual system and have repeatedly attracted attention [2,3,9,10].…”

Section: Analysis Of Experimental Datamentioning

confidence: 99%

“…The experimental point in Fig. 3 is the differential cross-section, measured by using the bremsstrahlung beam of electrons in the two runs with electron beam energies of 500 and 420 MeV [8]. The measurements were performed by the simultaneous detection of a positive pion and a proton.…”

Section: Analysis Of Experimental Datamentioning

confidence: 99%

Pion photoproduction on nucleus with two-nucleon emission

Glavanakov,

Tabachenko

2013

Preprint

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A model for the pion photoproduction on nuclei in the A (γ, πNN ) B reaction is presented. This is an extension of our recent model for the A (γ, πN ) B reaction. In this approach we have moved beyond the standard shell-model considering ∆N correlations in the nuclear wave functions, which are caused by the virtual transitions NN → ∆N → NN in the ground state of the nucleus. The main ingredients of the model are the two-and threeparticle density matrices and the transition operators γ∆ → Nπ and γN → Nπ. The direct and exchange reaction mechanisms, which follow from the structure of the density matrices, are examined. The model is used to investigate the 12 C(γ, π + p) and 12 C(γ, π − p) reactions in the kinematic region of the large momentum transfers to the residual nuclear system, where the pion production occurs with the emission of two nucleons.

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“…As an example, we can indicate (π + , π − p) reactions [5,6], where the charged state of a scattered particle changes by 2e, or (p, p ′ π + p) [7] and (γ, π − n) reactions accompanied by the production of particles whose total electric charge is +2 or −1. Such experimental data are usually interpreted, using the model of the quasifree knockout of the isobar [5][6][7][8][9]. The weakest element of this approach is the independent particle model, used as a model of the nucleus.…”

Section: Introductionmentioning

confidence: 99%

Isobar configurations: ΔN correlations versus the independent particle model

Glavanakov

Табаченко

2015

Nuclear Physics A

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We present a comparative analysis of two models for the A(γ, πN )B reaction, which take into account the isobar configurations in the ground state of the nuclei: the ∆N correlation model and the quasifree pion photoproduction model. The considered models differ in their descriptions of the nucleus states. The ∆N correlation model takes into account the dynamic correlations of the nucleon and isobar formed in the virtual transition N N → ∆N , and in the quasifree pion photoproduction model, isobars and nucleons in the nucleus are considered as independent constituents. The predictions of the models are considered for two reactionsIt is shown, that the two models predict the differential cross section significantly differing both in absolute values, and in the shape of the angular dependence. We compare the results of the ∆N correlation model for the (γ, πN ) and (γ, πN N ) reactions with the 16 O(γ, π − p) reaction data measured at BNL. Our results give support to the ∆N correlation model.

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Search for the Δ++ component in the C ground state using the C(γ,π+p) reaction

Cited by 19 publications

References 36 publications

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment

Pion photoproduction on nucleus with two-nucleon emission

Isobar configurations: ΔN correlations versus the independent particle model

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