<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Δ</mml:mi></mml:math>excitation and coherent pion production in charge exchange reactions

Das, Swapan

doi:10.1103/physrevc.66.014604

Cited by 18 publications

(28 citation statements)

References 56 publications

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“…The later is the key ingredient for the ∆-peak shift in the nucleus. The results of the (semi)exclusive measurements illustrate one to one correspondence with those of the pion nucleus scattering [11].…”

Section: Introductionsupporting

confidence: 49%

Modification of {$\mit \Delta $}(1232) in the Neutrino Nucleus Reaction

Das¹

2017

Acta Phys. Pol. B

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The remarkable observations in the pion induced and charge exchange reactions on a nucleus are the significant shift and broadening of the ∆(1232)-peak relative to free pion nucleon scattering. For the forward going massless leptons, the weak process (ν l , l) on a nucleon, according to Adler's partially conserved axial current theorem, is connected to the pion nucleon scattering. This mechanism is also applicable to the nucleus. Therefore, the modification of the ∆-peak in a nucleus can be seen in the (ν l , l) reaction since it is connected to the pion nucleus scattering. To investigate this issue quantitatively, the double differential cross sections of the forward going ejectile l energy distribution in the (ν l , l) reaction are calculated in the ∆-excitation region for both proton and nucleus. The measured pion nucleon and pion nucleus scattering cross sections in the quoted energy region are used in these reactions as input. Since the (ν l , l) reaction is connected to the pion induced scattering, the features of the previous reaction is shown analogous to those of the later.

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Section: Introductionsupporting

confidence: 49%

Modification of {$\mit \Delta $}(1232) in the Neutrino Nucleus Reaction

Das¹

2017

Acta Phys. Pol. B

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“…Based on thermodynamic considerations, this result provides possible evidence for a first-order phase transition [102]. The ISiS data have been examined for such an effect [103] and the results are shown in Fig. 37.…”

Section: Heat Capacitymentioning

confidence: 99%

Light-ion-induced multifragmentation: The ISiS project

et al. 2006

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An extensive study of GeV light-ion-induced multifragmentation and its possible interpretation in terms of a nuclear liquid-gas phase transition has been performed with the Indiana Silicon Sphere (ISiS) 4π detector array. Measurements were performed with 5-15 GeV/c p, p, and π − beams incident on 197 Au and 2-5 GeV 3 He incident on nat Ag and 197 Au targets. Both the reaction dynamics and the subsequent decay of the heavy residues have been explored. The data provide evidence Preprint submitted to Elsevier Science 10 March 2018for a dramatic change in the reaction observables near an excitation energy of E*/A = 4-5 MeV per residue nucleon. In this region, fragment multiplicities and energy spectra indicate emission from an expanded/dilute source on a very short time scale (20-50 fm/c). These properties, along with caloric curve and scaling-law behavior, yield a pattern that is consistent with a nuclear liquid-gas phase transition.

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“…used by Das et al [21] differentiates the caloric curve to obtain the heat capacity and also finds a negative excursion in the heat capacity near E*/A ~ 4-5 MeV. The concordance that is now emerging from both the caloric curve and heat capacity analyses provides still another strong argument in favor of a liquid-gas phase transition, suggestive of a firstorder phase transition.…”

Section: Thermodynamics: the Caloric Curve And Heat Capacitymentioning

confidence: 85%

The nuclear liquid-gas phase transition: Q.E.D

Viola

2004

Nuclear Physics A

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For the past decade, intense experimental effort has been devoted to the search for a liquid-gas phase transition in highly excited nuclei. Now, synthesis of the large body of existing multifragmentation data provides a strong case for identification of this phenomenon. In this presentation we discuss several salient features of the data that support their interpretation in terms of a spinodal liquid-gas phase transition.

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Δexcitation and coherent pion production in charge exchange reactions

Cited by 18 publications

References 56 publications

Modification of {$\mit \Delta $}(1232) in the Neutrino Nucleus Reaction

Modification of {$\mit \Delta $}(1232) in the Neutrino Nucleus Reaction

Light-ion-induced multifragmentation: The ISiS project

The nuclear liquid-gas phase transition: Q.E.D

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