Momentum Dependence of the Nuclear Isovector Spin Responses from (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>p</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mo>,</mml:mo><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>n</mml:mi></mml:mrow><mml:mrow><mml:mo>→</mml:mo></mml:mrow></mml:mover></mml:mrow></mml:mrow></mml:math>) Reactions at 494 MeV

Taddeucci, T. N.; Luther, B.; Rybarcyk, L.J.; Byrd, R.C.; McClelland, J. B.; Prout, D. L.; Delucia, S.; Cooper, D. A.; Marchlenski, D.; Sugarbaker, E.; Park, B. K.; Sams, Thomas; Goodman, C.D.; Rapaport, J.; Ichimura, M.; Kawahigashi, K.

doi:10.1103/physrevlett.73.3516

Cited by 68 publications

(60 citation statements)

References 17 publications

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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.…”

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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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Saturation of Nuclear Matter and Short-Range Correlations

et al. 2003

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“…have been used extensively to analyze quasielastic scattering data measured at LAMPF [11,12,13] and RCNP [1,3]. The 3 He(p, n) data at large angles are reasonably reproduced by the PWIA calculations, which certify the predominance of the quasielastic process around the peak region and the weakness of the nuclear correlations.…”

Section: Introductionmentioning

confidence: 81%

Cross sections and analyzing powers for(p,n)reactions onHe3
Ihara
¹
,
Wakasa
²
,
Dozono
³

et al. 2008
Phys. Rev. C
4
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0
0
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The cross-sections and analyzing powers for (p, n) reactions on 3 He and 4 He have been measured at a bombarding energy of T p = 346 MeV and reaction angles of θ lab = 9.4 • -27 • . The energy transfer spectra for 3 He(p, n) at large θ lab (≥ 16 • ) are dominated by quasielastic contributions, and can be reasonably reproduced by plane-wave impulse approximation (PWIA) calculations for quasielastic scattering. By contrast, the known L = 1 resonances in 4 Li are clearly observed near the threshold in the 4 He(p, n) spectra. Because these contributions are remarkable at small angles, the energy spectra are significantly different from those expected for quasielastic scattering. The data are compared with the PWIA calculations, and it is found that the quasielastic contributions are dominant at large θ lab (≥ 22 • ). The nuclear correlation effects on the quasielastic peak for 4 He(p, n) are also discussed.

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“…• by Taddeucci et al [7] In the both cases the transferred momentum q is about 1.7fm −1 for ω < 120MeV. Fig.…”

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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Momentum Dependence of the Nuclear Isovector Spin Responses from (p→,n→) Reactions at 494 MeV

Cited by 68 publications

References 17 publications

Saturation of Nuclear Matter and Short-Range Correlations

Saturation of Nuclear Matter and Short-Range Correlations

Cross sections and analyzing powers for(p,n)reactions onHe3
Ihara
¹
,
Wakasa
²
,
Dozono
³

et al. 2008
Phys. Rev. C
4
0
0
0
View full text Add to dashboard Cite

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

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Momentum Dependence of the Nuclear Isovector Spin Responses from (p→,n→) Reactions at 494 MeV

Cited by 68 publications

References 17 publications

Saturation of Nuclear Matter and Short-Range Correlations

Saturation of Nuclear Matter and Short-Range Correlations

Cross sections and analyzing powers for(p,n)reactions onHe3Ihara1, Wakasa2, Dozono3 et al. 2008Phys. Rev. C4000View full textAdd to dashboardCite

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

Contact Info

Product

Resources

About

Cross sections and analyzing powers for(p,n)reactions onHe3
Ihara
¹
,
Wakasa
²
,
Dozono
³

et al. 2008
Phys. Rev. C
4
0
0
0
View full text Add to dashboard Cite