Electroproduction of hypernuclei

Result code in IS VaVaI

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Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Electroproduction of hypernuclei

Original language description

In this work we explore various effects involved in the computation of the cross sections for electroproduction of hypernuclei. The model calculations are performed in the Impulse Approximation (IA) further assumed in the Optimal Factorization Approach (OFA) where the elementary amplitude is evaluated for an effective proton momentum. Our analysis introduces a general twocomponent form of the elementary amplitude facilitating inclusion of arbitrary effective momentum, thus accounting for Fermi motion effects. At this point, our calculations develop previous calculations performed with the zero value of the proton momentum, i.e., in the so called frozen-proton approximation.nDistortion of the final-state kaon wave function is addressed via the eikonal approximation, employing an optical potential for the kaon re-scattering on the nucleus, which can be adjusted using diverse forms of nuclear density. nFurthermore, our formalism for the calculations in Distorted Wave Impulse Approximation (DWIA) accommodates a sufficiently large model space of single-particle states, which is crucial for electroproduction of the medium- and heavy-mass hypernuclei. The single-particle transition densities, represented by the One-Body Density Matrix Elements (OBDME), are obtained from various many-body calculations utilizing different forms of the effective hyperon-nucleonn(YN) interactions.nThis developed advanced formalism enables a comprehensive examination of predicted cross sections for the electroproduction reaction across a wide range of hypernuclei. In particular, we investigate the impact of the Fermi motion, various kinematical assumptions, the kaon distortion, as well as various manybody approaches and forms of the effective YN interactions. In our analysis we explore effects in the angular and energy dependent cross sections for various hypernuclear states, including the p-shell hypernuclei 12ΛB and 16ΛN, and the sd-shell hypernuclei 40ΛK and 48ΛK. Comparisons with experimental data for 12ΛB and 16ΛN highlight sensitivity of the cross sections to different computational schemes, emphasizing importance of selecting the optimum proton momentum. nMoreover, the analysis reveals systematic variations in the Fermi motion effects among groups of the hypernuclear states with a specific spin and parity, allowing to formulate a “dynamical selection rule”. It was also shown that the kaon distortion significantly suppresses the cross sections, particularly for deeply Λ bound states. These effects are more pronounced in heavier hypernuclei. The predicted spectra for medium-mass hypernuclei, 48ΛK and 40ΛK, show a potential of the Tamm-Dancoff approach and provide insights into preparation and data analysis of the experiments planned at the Jefferson Laboratory (JLab).nIn conclusion, our comprehensive theoretical framework offers valuable insights into the complex dynamics of hypernuclear electroproduction, facilitating deeper understanding of it. It can be also utilized in preparing future experiments in hypernuclear physics.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů