Hyperons and Resonances in Nuclear Matter

Lenske, H.; Dhar, Madhumita

doi:10.1007/978-3-319-74878-8_5

Cited by 11 publications

(5 citation statements)

References 202 publications

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“…Reduction of the nucleon and ∆ masses by about -30 MeV have been discussed in [6]. In recent measurements, the ∆ effective mass was observed to be shifted by about -60 MeV in peripheral and central heavy-ion collisions [7,8]. In contrast, the effective mass of the N * (1535) nucleon resonance which couples strongly to the η meson is observed to be approximately density independent in heavy-ion collisions [75] and photoproduction experiments [76,77], though some evidence for broadening was observed [77].…”

Section: Medium Modificationsmentioning

confidence: 99%

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The $η$- and $η'$-nucleus interactions and the search for $η$, $η'$- mesic states

Bass¹,

Metag²,

Moskal³

2021

Preprint

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The isoscalar η and η mesons are special in QCD, being linked both to chiral symmetry and to non-perturbative glue associated with the axial anomaly. The properties of these mesons in medium are sensitive to how these dynamics work in the nuclear environment. In contrast to pionic and kaonic atoms which are mainly bound by the Coulomb interaction with some corrections due to the strong force (Coulomb assisted binding), the η and η as neutral mesons can only be bound by the strong interaction. Is this interaction strong enough? This topic has inspired a vigorous program of experiments, conducted in close contact with theory, One has to determine the complex η, η -nucleus potential. Does the real part V provide a sufficiently deep potential? Is the imaginary part W small enough to allow for narrow states that can more easily be detected experimentally, i.e. |W | |V |? The η effective mass is observed to be suppressed by ≈ −40 MeV at nuclear matter density. Bound state searches are ongoing. This article gives an overview of the status of knowledge in this field together with an outlook to future experiments.

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Section: Medium Modificationsmentioning

confidence: 99%

“…A detailed overview of meson properties in medium is given in [5]. One also finds that the nucleon and ∆ masses are suppressed in medium [6,7,8]. What should one expect for the η and η ?…”

Section: Introductionmentioning

confidence: 99%

The $η$- and $η'$-nucleus interactions and the search for $η$, $η'$- mesic states

Bass¹,

Metag²,

Moskal³

2021

Preprint

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“…N (ω, q) is the spectral distribution of nucleon hole-nucleon N ′ N −1 target transitions (see Refs. [11,12,49,50] for detailed discussions and explicit expressions), M qe is the scattering amplitude of the elementary process p + n → n + p and λ(a, b, c) = a 2 + b 2 + c 2 − 2ab − 2ac − 2bc is the so-called Källen function.…”

Section: Model Calculationsmentioning

confidence: 99%

Systematic study of Δ(1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn

Rodríguez-Sánchez

Benlliure²,

Vidaña³

et al. 2021

Preprint

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The fragment separator FRS has been for the first time used to measure the (n, p) and (p, n)type isobaric charge-exchange cross sections of stable 112,124 Sn isotopes accelerated at 1A GeV with an uncertainty of 3% and to separate quasi-elastic and inelastic components in the missing-energy spectra of the ejectiles a . The inelastic contribution can be associated to the excitation of isobar ∆(1232) resonances and to the pion emission in s-wave, both in the target and projectile nuclei, while the quasi-elastic contribution is associated to the nuclear spin-isospin response of nucleon-hole excitations. The data lead to interesting results where we observe a clear quenching of the quasielastic component and their comparisons to theoretical calculations demonstrate that the baryonic resonances can be excited in the target and projectile nuclei. To go further in this investigation, we propose to study the excitation of baryonic resonances taking advantage of the combination of high-resolving power magnetic spectrometers with the WASA calorimeter. These new measurements will allow us to determine the momenta of the ejectiles and pions emitted in coincidence after the single isobaric charge-exchange collisions, providing us unique opportunities to study the evolution of the baryonic resonance dynamics with the neutron-proton asymmetry through the use of exotic radioactive ion beams.

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“…Physics of hypernuclei is an important branch of nuclear physics at low as well as at intermediate energies [1][2][3][4][5][6][7]. Hypernucleus is a kind of nucleus with atomic weight A and atomic number Z, contained at least one hyperon (Λ, Σ, Θ, and perhaps Ω) except protons and neutrons.…”

Section: Introductionmentioning

confidence: 99%

What can we know about hypernuclei via analysis of bremsstrahlung photons?

Liu¹,

Maydanyuk²,

Liu³

et al. 2018

Preprint

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We investigate possibility of emission of the bremsstrahlung photons in nuclear reactions with hypernuclei for the first time. A new model of the bremsstrahlung emission which accompanies interactions between α particles and hypernuclei is constructed, where a new formalism for the magnetic momenta of nucleons and hyperon inside hypernucleus is added. For first calculations, we choose α decay of the normal nucleus 210 Po and the hypernucleus 211 Λ Po. We find that (1) emission for the hypernucleus 211 Λ Po is larger than for normal nucleus 210 Po, (2) difference between these spectra is small. We propose a way how to find hypernuclei, where role of hyperon is the most essential in emission of bremsstrahlung photons during α decay. As demonstration of such a property, we show that the spectra for the hypernuclei 107 Λ Te and 109 Λ Te are essentially larger than the spectra for the normal nuclei 106 Te and 108 Te. Such a difference is explained by additional contribution of emission to the full bremsstrahlung, which is formed by magnetic moment of hyperon inside hypernucleus. The bremsstrahlung emission formed by such a mechanism, is of the magnetic type. A new formula for fast estimations of bremsstrahlung spectra for even-even hypernuclei is proposed, where role of magnetic moment of hyperon of hypernucleus in formation of the bremsstrahlung emission is shown explicitly. Such an analysis opens possibility of new experimental study of properties of hypernuclei via bremsstrahlung study.

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Hyperons and Resonances in Nuclear Matter

Cited by 11 publications

References 202 publications

The $η$- and $η'$-nucleus interactions and the search for $η$, $η'$- mesic states

The $η$- and $η'$-nucleus interactions and the search for $η$, $η'$- mesic states

Systematic study of Δ(1232) resonance excitations using single isobaric charge-exchange reactions induced by medium-mass projectiles of Sn

What can we know about hypernuclei via analysis of bremsstrahlung photons?

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