Pauli blocking and medium effects in nucleon knockout reactions

Bertulani, C. A.; Conti, Claudio

doi:10.1103/physrevc.81.064603

Cited by 79 publications

(87 citation statements)

References 31 publications

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“…The fits are given by the expressions (1) and (2) of Ref. [62]. Their analytical fit reproduces very well the experimental total pp and pn cross sections in the energy interval 10 MeV E lab 5 GeV.…”

Section: F Nucleon-nucleon Cross Sectionsmentioning

confidence: 87%

Quasifree (p,2p) and (p,pn)

2013

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We study (p,2p) and (p,pn) reactions at proton energies in the range of 100 MeV-1 GeV. Our purpose is to explore the most sensitive observables in unpolarized reactions with inverse kinematics involving radioactive nuclei. We formulate a model based on the eikonal theory to describe total cross sections and momentum distributions of the recoiled residual nucleus. The model is similar to the one adopted for knockout reactions with heavy ions. We show that momentum distributions are sensitive to the angular momentum of the ejected nucleon which can be used as an spectroscopic tool. The total cross sections are sensitive to the nucleon separation energies and to multiple scattering effects. Our calculations also indicate that a beam energy around 500 MeV/nucleon has a smaller dependence on the anisotropy of the nucleon-nucleon elastic scattering.

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Section: F Nucleon-nucleon Cross Sectionsmentioning

confidence: 87%

Quasifree (p,2p) and (p,pn)

2013

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“…(18) by means of the profile function pN will be subject to medium modifications [24,25]. Mechanisms such as Pauli blocking often lead to an effective reduction of the nucleon-nucleon cross sections in the medium.…”

Section: B Relativistic Multiple-scattering Glauber Approximationmentioning

confidence: 99%

Density dependence of quasifree single-nucleon knockout reactions

2011

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We address the issue of whether quasifree single-nucleon knockout measurements carry sufficient information about the nuclear interior. To this end, we present comparisons of the reaction probability densities for A(e,e p) and A (p,2p) in quasifree kinematics for the target nuclei 4 He, 12 C, 56 Fe, and 208 Pb. We adopt a comprehensive framework based on the impulse approximation and on a relativized extension of Glauber multiple-scattering reaction theory in which the medium effects related to short-range correlations (SRCs) are implemented. It is demonstrated that SRCs weaken the effect of attenuation. For light target nuclei, both the quasifree (p,2p) and (e,e p) can probe average densities of the same order as nuclear saturation density ρ 0 . For heavy nuclei such as 208 Pb, the probed average densities are smaller than 0.1ρ 0 and the (e,e p) reaction is far more efficient in probing the bulk regions than (p,2p).

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“…In figure 8 we plot the longitudinal momentum distributions for the reaction 9 Be( 11 Be, 10 Be), at 250 MeV/nucleon [74]. The dashed curve is the cross section calculated using the NN cross section from the Brueckner theory and the solid curve is obtained with the free cross section.…”

Section: Knock-out Reactionsmentioning

confidence: 99%

Theory of the Coulomb Dissociation

Bertulani¹

2013

Proceedings of VI European Summer School on Experimental Nuclear Astrophysics — PoS(ENAS 6)

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We observe photons and neutrinos from stars. Based on these observations, complemented by measurements of cosmic rays energies and composition, we have been able to constrain several models for the Big Bang and for stellar evolution. But that is not enough. We also need to help this effort with laboratory experiments. We are still far from being able to reproduce stellar environments in a terrestrial laboratory. But in many cases we can obtain accurate nuclear reaction rates needed for modeling primordial nucleosynthesis and hydrostatic burning in stars. The relevant reactions are difficult to measure directly in the laboratory at the small astrophysical energies. In recent years indirect reaction methods have been developed and applied to extract low-energy astrophysical S-factors. These methods require a combination of new experimental techniques and theoretical efforts, which are the subject of this short review.

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Pauli blocking and medium effects in nucleon knockout reactions

Cited by 79 publications

References 31 publications

Quasifree (p,2p) and (p,pn)

Quasifree (p,2p) and (p,pn)

Density dependence of quasifree single-nucleon knockout reactions

Theory of the Coulomb Dissociation

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