Investigation of short-range nucleon-nucleon correlations using the reaction in close to 4π geometry

Blomqvist, K. I.; Boeglin, W.; Böhm, R.; Distler, M. O.; Edelhoff, R.; Friedrich, J.; Geiges, R.; Jones, M.; Kahrau, M.; Korn, M.; Krämer, H.; Krygier, K. W.; Kunde, V. G.; Kuss, M.; Liesenfeld, A.; Merle, K.; Morris, Christopher; Neuhausen, R.; Offermann, E.A.J.M.; Pospischil, Th.; Potokar, M.; Ransome, R. D.; Richter, A.; Ritchie, Barry; Rokavec, A.; Rosner, G.; Ryckebusch, Jan; Sauer, P. U.; Schardt, S.; Vodenik, B.; Wagner, Andreas; Walcher, Th.; Wolf, S.; Yadav, Monika

doi:10.1016/s0370-2693(98)00024-0

Cited by 44 publications

(24 citation statements)

References 32 publications

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“…Thereby, in computing the matrix elements, all FSI effects have been neglected and the zero-range approximation (lim r 12 →0 ) has been adopted. A 12 C(e,e pp) experiment conducted at the Mainz Microtron (MAMI) [37] showed very good quantitative agreement with the predicted diproton pair c.m. momentum factorization up to momenta of about 500 MeV.…”

Section: Factorization Of the Two-nucleon Knockout Cross Sectionmentioning

confidence: 57%

Factorization of exclusive electron-induced two-nucleon knockout

et al. 2014

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We investigate the factorization properties of the exclusive electroinduced two-nucleon knockout reaction A(e,e pN). A factorized expression for the cross section is derived and the conditions for factorization are studied. The A(e,e pN) cross section is shown to be proportional to the conditional center-of-mass (c.m.) momentum distribution for close-proximity pairs in a state with zero relative orbital momentum and zero radial quantum number. The width of this conditional c.m. momentum distribution is larger than the one corresponding with the full c.m. momentum distribution. It is shown that the final-state interactions (FSIs) only moderately affect the shape of the factorization function for the A(e,e pN) cross sections. Another prediction of the proposed factorization is that the mass dependence of the A(e,e pp) [A(e,e pn)] cross sections is much softer than[NZ].

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Section: Factorization Of the Two-nucleon Knockout Cross Sectionmentioning

confidence: 57%

Factorization of exclusive electron-induced two-nucleon knockout

et al. 2014

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“…Indeed, the 12 C(e, e pp) measurements of Ref. [25] determined F (P ) over a large P range and observed it to be compatible with a mean-field prediction. We have performed Monte-Carlo simulations in order to determine the correction factor PS d P F (P ) for all nuclei that are considered here.…”

mentioning

confidence: 64%

Counting the number of correlated pairs in a nucleus

Vanhalst

Cosyn²,

Ryckebusch³

2011

Phys. Rev. C

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We suggest that the number of correlated nucleon pairs in an arbitrary nucleus can be estimated by counting the number of proton-neutron, proton-proton, and neutron-neutron pairs residing in a relative $S$ state. We present numerical calculations of those amounts for the nuclei $^{4}$He, $^{9}$Be, $ ^{12}$C, $ ^{27}$Al, $ ^{40}$Ca, $ ^{48}$Ca, $ ^{56}$Fe, $ ^{63}$Cu, $ ^{108}$Ag, and $ ^{197}$Au. The results are used to predict the values of the ratios of the per-nucleon electron-nucleus inelastic scattering cross section to the deuteron in the kinematic regime where correlations dominate.Comment: 11 pages, 3 figure

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“…The validity of this expression (3) has been experimentally verified. The proposed factorization of the cross section in terms of F pp,D A was first confirmed in 12 C(e, e pp) measurements back in the late 1990s [9]. An effort is on its way to extract the width of the F pp,D A distribution in A(e, e pp) measurements on 12 C, 27 Al, 56 Fe and 208 Pb [25,26], and compare them with the theoretical predictions [22].…”

Section: Introductionmentioning

confidence: 96%

“…In appropriately selected kinematics, those reactions give access to the dynamics and isospin composition of the initial nucleon pair. In the 1990s, high-resolution A(e, e pp) measurements carried out at MAMI [8,9] and NIKHEF [10][11][12] could determine the transition to a specific final state of the residual A − 2 nucleus. When comparing to data for the 16 O(e, e pp) transition to the 0 + ground state of 14 C, model calculations [13][14][15] showed the clear dominance of SRC contributions to the cross section at low c.m.…”

Section: Introductionmentioning

confidence: 99%

Final-state interactions in two-nucleon knockout reactions

2016

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Background: Exclusive two-nucleon knockout after electroexcitation of nuclei (A(e, e N N ) in brief) is considered to be a primary source of information about short-range correlations (SRC) in nuclei. For a proper interpretation of the data, final-state interactions (FSI) need to be theoretically controlled.Purpose: Our goal is to quantify the role of FSI effects in exclusive A(e, e pN ) reactions for four target nuclei representative for the whole mass region. Our focus is on processes that are SRC driven. We investigate the role of FSI for two characteristic detector setups corresponding with a "small" and "large" coverage of the available phase space.Method: Use is made of a factorized expression for the A(e, e pN ) cross section that is proportional to the two-body center-of-mass (c.m.) momentum distribution of close-proximity pairs. The A(e, e pp) and A(e, e pn) reactions for the target nuclei 12 C, 27 Al, 56 Fe and 208 Pb are investigated. The elastic attenuation mechanisms in the FSI are included using the relativistic multiple-scattering Glauber approximation (RMSGA). Single-charge exchange (SCX) reactions are also included. We introduce the nuclear transparency T pN A , defined as the ratio of exclusive (e, e pN ) cross sections on nuclei to those on "free" nucleon pairs, as a measure for the aggregated Conclusion:The SCX mechanisms represent a relatively small (order of a few percent) contribution of SRCdriven A(e, e pN ) processes. The mass dependence of FSI effects in exclusive A(e, e pN ) can be captured in a robust power law and is in agreement with the predictions obtained in a toy model.

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Investigation of short-range nucleon-nucleon correlations using the reaction in close to 4π geometry

Cited by 44 publications

References 32 publications

Factorization of exclusive electron-induced two-nucleon knockout

Factorization of exclusive electron-induced two-nucleon knockout

Counting the number of correlated pairs in a nucleus

Final-state interactions in two-nucleon knockout reactions

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