Δ isobar in nuclei (review of experimental data)

Mukhin, K.N.; Патаракин, О.О.

doi:10.1070/pu1995v038n08abeh000098

Cited by 14 publications

(6 citation statements)

References 135 publications

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“…[33] [see Eqs. (3), (4) and explanation in the text of that paper; also see Appendix A in Ref. [25]], we find new relative coordinate r = r p − R A , new relative coordinates ρ Aj = r Aj − R A for nucleons for the nucleus.…”

Section: Operator Of Emission With Relative Coordinatessupporting

confidence: 53%

“…Non-nucleon degrees of freedom in nuclei were often studied in nuclear physics [1][2][3]. Last years some attention has been focused on hadron excitation of ∆(1232)-resonances in nuclear matter (for brevity, term ∆-resonance in nuclei will be used in this paper) [4,5]. Proton, electron, photon and pion can be used as a probe to study such ∆-resonances in nuclei.…”

Section: Introductionmentioning

confidence: 99%

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Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the $Δ$-resonance energy region

Maydanyuk¹

2022

Preprint

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We investigate emission of the bremsstrahlung photons in the scattering of protons off nuclei at the ∆-resonance energy region. Including properties of ∆-resonance in the nucleus-target to the bremsstrahlung model, we find the following. (1) Ratio between incoherent emission and coherent emission is about 10 6 -10 7 for p + 197 Au (without ∆-resonance) at energy of proton beam Ep of 190 MeV, where the calculated full bremsstrahlung spectrum is in good agreement with experimental data. This confirms importance of incoherent processes in study of ∆-resonances in this reaction, which have never been studied yet. We estimate coherent and incoherent contributions, electric and magnetic contributions, full bremsstrahlung spectra for the scattering of protons on the 12 C, 40 Ca, 208 Pb nuclei at Ep = 800 MeV, we find conditions for the most intensive bremsstrahlung emission.(2) Transition p N → ∆ + N in the nucleus-target reinforces emission of bremsstrahlung photons in that reaction at Ep = 800 MeV. Difference between the spectra for normal nuclei and nuclei with included ∆-resonance is larger for more light nuclei, but the spectra are larger for heavier nuclei. (3) Taking into account shortly lived state of ∆-resonance, we find that the spectrum with ∆-resonance in the nucleus-target is essentially larger in the high energy photon region than the spectrum without this ∆-resonance (corresponding calculations for 12 ∆ C, 40 ∆ Ca, 208 ∆ Pb in comparison with 12 C, 40 Ca, 208 Pb are provided). Such an aspect is recommended for registration of ∆-resonances in nuclei in possible future experiments.

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Section: Operator Of Emission With Relative Coordinatessupporting

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the $Δ$-resonance energy region

Maydanyuk¹

2022

Preprint

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“…The spectrum of nuclear matter on the border of the phase transition should be very complex, but it seems undoubted that the lower states of this spectrum are related to excitation of ∆(1232) and other resonances [9]. Thus, information on the properties of the ∆(1232)-resonances produced in nuclear matter is important for an in-depth understanding of nucleus-nucleus collisions at ultra relativistic energies [9,10].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

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Abstract:The production of ∆ 0 (1232)-resonances in p+ 12 C collisions at 4.2 GeV/c was analyzed with 4π acceptance. The mass distribution of ∆ 0 (1232) was reconstructed using an angular criterion. The fraction of charged π − -mesons coming from ∆ 0 (1232) decay was estimated and compared to those obtained in earlier works. The momentum, transverse momentum, kinetic energy, and rapidity distributions as well as invariant cross sections of ∆ 0 (1232)-resonances were reconstructed in the laboratory frame. The mean kinematical characteristics of the reconstructed ∆ 0 (1232) were compared to those of participant protons in experiment and within some of the models. The freeze-out temperature of ∆ 0 (1232) estimated in the present analysis was compared with those obtained using different methods for ∆(1232) produced with other sets of colliding nuclei at various incident energies. The relative number of nucleons excited to ∆ 0 (1232) at freeze-out conditions in p+ 12 C collisions was estimated.

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“…This modification was also related to the values of hadronic density, temperature, and non-nucleon degrees of freedom in nuclear matter [1,[8][9][10][11][12]. However, still many experimental results on Δ(1232) production are nontrivial and not a single theoretical model can account for all the observed properties of Δ(1232) produced in hadron-nucleus and nucleus-nucleus collisions in a wide range of incident energies [13][14][15]. The possibility of a phase transition of nuclear matter into state of quark-gluon plasma has been widely discussed and researched over the last few decades.…”

mentioning

confidence: 98%

“…The possibility of a phase transition of nuclear matter into state of quark-gluon plasma has been widely discussed and researched over the last few decades. The spectrum of nuclear matter on the border of the phase transition should be very complex, but it seems undoubted that the lower states of this spectrum are related to excitation of Δ(1232) and other resonances [13]. Thus, information on the properties of Δ(1232) resonances produced in nuclear matter is important for an in-depth understanding and interpretation of nucleus-nucleus collisions at ultrarelativistic energies [13,14].…”

mentioning

confidence: 99%

Comparison of characteristics of Δ0(1232) produced in p 12C and d 12C collisions at 4.2 A GeV/c

2012

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Reconstructed momentum, transverse momentum, kinetic energy, rapidity, and emission angle distributions along with their mean values were compared for Δ 0 (1232) resonances produced in p 12 C and d 12 C collisions at 4.2 A GeV/c. Mean momentum, transverse momentum, and rapidity of protons and negative pions coming from Δ 0 (1232) decay were extracted and compared with the corresponding mean values for protons and π − mesons in experiment and the relevant model calculations.

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Δ isobar in nuclei (review of experimental data)

Cited by 14 publications

References 135 publications

Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the $Δ$-resonance energy region

Enhancement of incoherent bremsstrahlung in proton-nucleus scattering in the $Δ$-resonance energy region

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Comparison of characteristics of Δ0(1232) produced in p 12C and d 12C collisions at 4.2 A GeV/c

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