Swelling nucleons in QCD

Noble, J.V.

doi:10.1016/0370-2693(86)91511-x

Cited by 17 publications

(39 citation statements)

References 17 publications

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“…Is the excess strength and the response function behavior seen previously in the 12 C(e,e 0 p) high E miss continuum also present a t e v en higher momentum transfer in 16 O? Is the observed high E miss behavior independent of the nucleus and the momentum transfer?…”

Section: The Present Experimentsmentioning

confidence: 90%

“…The kinematics of the 16 O(e,e 0 p) measurements in the quasielastic region are given in table 2.2. All quasielastic measurements were performed at xed values of momentum and energy transfer, jq j !, of 1 GeV and 445 MeV.…”

Section: Kinematics and Experimental Methods 231 Quasielastic Regionmentioning

confidence: 99%

“…level between di erent kinematic settings. The regular 16 O(e,e 0 p) data taking was performed with 6.0 msr collimators on both spectrometers. After parallel kinematics data taking at each beam energy, the HRSH was moved to the angles indicated in Fig.…”

Section: Kinematics and Experimental Methods 231 Quasielastic Regionmentioning

confidence: 99%

“…Muther et al 47] calculated the e ects of these correlations in 16 O and have shown that they cause a depletion of strength in conventional quasi-hole states to the bene t of high-E miss , high-P miss channels. In an 16 O(e,e 0 p) experiment performed at Mainz, Blomqvist et al 48] have measured the 16 O(e,e 0 p) cross section for 0 MeV < E miss < 120 MeV at several values of P miss ranging from 120 MeV/c to 590 MeV/c. The results from this experiment ( Fig.…”

Section: Distorted Wave Impulse Approximationmentioning

confidence: 99%

“…The 16 O(e,e 0 p) reaction was studied in the rst physics experiment performed at Je erson lab Hall A. In the quasielastic region cross sections were measured for both quasi-parallel and perpendicular kinematics at q = 1 0 0 0 M e V a n d !…”

Section: Introductionmentioning

confidence: 99%

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A study of the <sup>16</sup>O (e, e'p) reaction at deep missing energies

Liyanage

1999

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The 16 O(e,e 0 p) reaction was studied in the rst physics experiment performed at Je erson lab Hall A. In the quasielastic region cross sections were measured for both quasi-parallel and perpendicular kinematics at q = 1 0 0 0 M e V a n d ! =445 MeV. From the data acquired in quasi-parallel kinematics, longitudinal and transverse response functions, R L and R T were separated for E miss < 60 MeV. The perpendicular kinematics data were used to extract R LT , R T , a n d R L + VT T VL R T T response functions for the same E miss range and for P miss < 310 MeV/c. The 16 O(e,e 0 p) cross section was measured in the dip region at q = 1026 MeV and ! =586 MeV for 10 MeV < E miss < 320 MeV. This thesis presents the results for the missing energy continuum (E miss > 25 MeV) from this experiment.The measured cross sections and the response functions are compared to DWIA and HF-RPA calculations of the strength for the single particle knockout from the 1s 1=2 shell. For the quasielastic, quasi-parallel kinematics setting, the measured cross sections and the response functions for E miss < 50 MeV are mostly accounted for by the single particle knockout from 1s 1=2 . For 50 MeV < E miss < 60 MeV, R T remains strong while R L appears to go to zero. The di erence between the longitudinal and transverse spectral functions, S T ; S L , which is expected to be zero for a f r e e n ucleon, is close to zero at lower E miss but increases above the two n ucleon emission threshold.The behavior of R L and R T for the j pq j = 8 setting is very similar to that of the quasi-parallel setting: for 50 MeV < E miss < 60 MeV, R L ! 0 while R T remains strong. However R LT is non-zero for 50 MeV < E miss < 60 MeV, indicating that R L might b e small but non-zero in this E miss range.For the quasielastic, j pq j = 1 6 setting, the relative strength in the continuum compared to the strength in the valence states is much higher than at lower P miss settings. Only a small fraction of this continuum strength is accounted for by the calculated 1s 1=2 knockout strength. R T and R LT response functions are also much stronger than the prediction, while the longitudinal response is small as predicted.The cross sections calculated for the quasielastic, j pq j = 2 0 settings show e v en higher relative strengths in the continuum compared to the valence states. The phase space of the pq = ;20 setting extends across the two body correlated ridge and shows an increase in cross section around the location of the ridge.The cross section measured in the dip region exhibits continuum strength up to the highest measured E miss of 320 MeV. An increase in this cross section is observed above the pion production threshold.

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Section: The Present Experimentsmentioning

confidence: 90%

Section: Kinematics and Experimental Methods 231 Quasielastic Regionmentioning

confidence: 99%

Section: Kinematics and Experimental Methods 231 Quasielastic Regionmentioning

confidence: 99%

Section: Distorted Wave Impulse Approximationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A study of the <sup>16</sup>O (e, e'p) reaction at deep missing energies

Liyanage

1999

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Quasi-deuteron model and nucleon swelling in photonuclear reactions

Murgia

Quarati

1989

Nuov Cim A

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Changes in the radius of a nucleon in interaction with another nucleon

Kälbermann¹,

Frankfurt

Eisenberg

1994

Physics Letters B

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We consider a two-nucleon system described by two different skyrmion models that provide attraction for the central NN potential. One of these models is based on the product ansatz and the other on dilaton coupling. Within these models we ask the question, To what degree does the nucleon swell or shrink when the internucleon separation distance is appropriate to attraction or repulsion? We find typically swelling of 3 to 4 percent for central attraction of some 40 to 50 MeV.Comment: Nine pages of plain TeX plus two uuencoded figure

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Swelling nucleons in QCD

Cited by 17 publications

References 17 publications

A study of the <sup>16</sup>O (e, e'p) reaction at deep missing energies

A study of the <sup>16</sup>O (e, e'p) reaction at deep missing energies

Quasi-deuteron model and nucleon swelling in photonuclear reactions

Changes in the radius of a nucleon in interaction with another nucleon

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