Polarization transfer and spin response functions in quasielastic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mo>(</mml:mo><mml:mi mathvariant="italic">p</mml:mi><mml:mo>→</mml:mo><mml:mo>,</mml:mo><mml:mi mathvariant="italic">n</mml:mi><mml:mo>→</mml:mo><mml:mo>)</mml:mo></mml:math>reactions at 346 MeV

Wakasa, T.; Sakai, H.; Hatanaka, K.; Okamura, Hiroshi; Otsu, H.; Fujita, Satoshi; Nonaka, Takamasa; Uesaka, T.; Satou, Y.; Ohnishi, T.; Yokoyama, G.; Ishida, S.; Sakamoto, N.; Greenfield, M. B.; Ichimura, M.; Kawahigashi, K.

doi:10.1103/physrevc.59.3177

Cited by 49 publications

(52 citation statements)

References 54 publications

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“…One may consider the salient difference of the ratio of spin-longitudinal and spin-transverse response function in nuclear matter and finite nuclei as another indication of the relevance of this suggestion [162]. We also like to point out that experimental information of these response functions [163] - [165] suggests no characteristic enhancement of the (pionic) spin-longitudinal response as expected on the basis of nuclear matter calculations.…”

Section: Saturation Of Nuclear Matter From Short-range Correlationsmentioning

confidence: 99%

Self-consistent Green's function method for nuclei and nuclear matter

Dickhoff

Barbieri

2004

Progress in Particle and Nuclear Physics

485

598

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Recent results obtained by applying the method of self-consistent Green's functions to nuclei and nuclear matter are reviewed. Particular attention is given to the description of experimental data obtained from the (e,e ′ p) and (e,e ′ 2N) reactions that determine one and two-nucleon removal probabilities in nuclei since the corresponding amplitudes are directly related to the imaginary parts of the single-particle and two-particle propagators. For this reason and the fact that these amplitudes can now be calculated with the inclusion of all the relevant physical processes, it is useful to explore the efficacy of the method of self-consistent Green's functions in describing these experimental data. Results for both finite nuclei and nuclear matter are discussed with particular emphasis on clarifying the role of short-range correlations in determining various experimental quantities. The important role of long-range correlations in determining the structure of lowenergy correlations is also documented. For a complete understanding of nuclear phenomena it is therefore essential to include both types of physical correlations. We demonstrate that recent experimental results for these reactions combined with the reported theoretical calculations yield a very clear understanding of the properties of all protons in the nucleus. We propose that this knowledge of the properties of constituent fermions in a correlated many-body system is a unique feature of nuclear physics.

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Section: Saturation Of Nuclear Matter From Short-range Correlationsmentioning

confidence: 99%

Self-consistent Green's function method for nuclei and nuclear matter

Dickhoff

Barbieri

2004

Progress in Particle and Nuclear Physics

485

598

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“…One may consider the salient difference of the ratio of spinlongitudinal and spin-transverse response function in nuclear matter and finite nuclei as another indication of the relevance of our suggestion [44]. We also like to point out that experimental information of these response functions [45,46,47] suggests no characteristic enhancement of the (pionic) spin-longitudinal response as expected on the basis of nuclear matter calculations.…”

mentioning

confidence: 99%

Saturation of Nuclear Matter and Short-Range Correlations

et al. 2003

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A fully self-consistent treatment of short-range correlations in nuclear matter is presented. Different implementations of the determination of the nucleon spectral functions for different interactions are shown to be consistent with each other. The resulting saturation densities are closer to the empirical result when compared with (continuous choice) Brueckner-Hartree-Fock values. Arguments for the dominance of short-range correlations in determining the nuclear-matter saturation density are presented. A further survey of the role of long-range correlations suggests that the inclusion of pionic contributions to ring diagrams in nuclear matter leads to higher saturation densities than empirically observed. A possible resolution of the nuclear-matter saturation problem is suggested. Several different remedies for this serious problem have been proposed over the years. The intrinsic structure of the nucleon and its related strong coupling to the ∆-isobar inevitably requires the consideration of three-body (or more-body) forces. When three-body forces are considered in variational calculations it is possible to achieve better saturation properties only when an adhoc repulsive short-range component of this three-body force is added [6,7]. It has also been suggested that a relativistic treatment of the nucleon in the medium using a DiracBrueckner approach provides the necessary ingredients for a better description of saturation [8,9,10,11].All many-body methods developed for nuclear matter have focused on a proper treatment of short-range correlations (SRC) without the benefit of experimental information on the influence of these correlations on the properties of the nucleon in the medium. This influence can now be clearly identified by considering recent results from (e,e ′ p) reactions [12,13,14] and theoretical calculations of the nucleon spectral function in nuclear matter [15,16,17]. A recent analysis of the (e,e ′ p) reaction on 208 Pb in a wide range of missing energies and for missing momenta below 270 MeV/c yields information on the occupation numbers of all the deeply-bound proton orbitals. These data indicate that all these orbitals are depleted by the same amount of about 15% [18]. These occupation numbers are associated with the orbits which yield an accurate fit to the (e,e ′ p) cross section. The properties of these occupation numbers suggest that the main effect of the global depletion of these meanfield orbitals is due to SRC. Indeed, the effect of the coupling of hole states to low-lying collective excitations only affects occupation numbers of states in the immediate vicinity of the Fermi energy [19]. In addition, nuclear matter momentum distributions display such an overall global depletion due to short-range and tensor correlations [17,20,21]. The latter results formed the basis of the now corroborated prediction [22,23] for the occupation numbers in 208 Pb [18].Most of this depleted single-particle (sp) strength is located at energies more than 100 MeV above the Fermi energy [17,20,22]. This ap...

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“…As for the exprimental results of the T p = 346MeV cases, we quoted the latest results [12] instead of the published ones. [8] Our findings imply that the various old calculations of the critical density ρ c of the pion condensation based on the universality ansatz should be redone. It may give a great modification on the equation of state and the scenario of the cooling of the neutron star.…”

Section: Numerical Analysis Ofmentioning

confidence: 99%

“…[7,8] The coefficient D ij represents the transition probability from the proton with the spin polarization in the direction i to the neutron with the spin polarization in the direction j. The directions are specified in Fig.…”

Section: Experimental Methods To Study the Pionic Modesmentioning

confidence: 99%

PIONIC MODES STUDIED BY QUASIELASTIC $(\vec p, \vec n)$ REACTIONS

Ichimura

Kawahigashi

2002

Challenges of Nuclear Structure

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It has long been expected that the pionic modes show some collective phenomena such as the pion condensation in the high density nuclear matter and its precursor phenomena in the ordinary nuclei. Here we show an evidence of the precursor observed in the isovector spin longitudinal cross sections IDq of the quasielastic 12 C, 40 Ca ( p, n) reactions at Tp = 346 and 494MeV with the momentum transfer q =1.7fm

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Polarization transfer and spin response functions in quasielastic(p→,n→)reactions at 346 MeV

Cited by 49 publications

References 54 publications

Self-consistent Green's function method for nuclei and nuclear matter

Self-consistent Green's function method for nuclei and nuclear matter

Saturation of Nuclear Matter and Short-Range Correlations

PIONIC MODES STUDIED BY QUASIELASTIC $(\vec p, \vec n)$ REACTIONS

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