Dominance of Tensor Correlations in High-Momentum Nucleon Pairs Studied by 
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 Reaction

Terashima, S.; Yu, Liting; Ong, H. J.; Tanihata, I.; Adachi, Satoshi; Aoi, N.; Chan, P.; Fujioka, Hiroyuki; Fukuda, M.; Geißel, H.; Gey, G.; Golak, J.; Haettner, E.; Iwamoto, Chihiro; Kawabata, T.; Kamada, H.; Le, Xinyi; Sakaguchi, H.; Sakaue, A.; Scheidenberger, C.; Skibiński, R.; Sun, B.; Tamii, A.; Tang, T. L.; Tran, D. T.; Topolnicki, K.; Wang, T. F.; Watanabe, Yoshiki; Weick, H.; Witała, H.; Zhang, G. X.; Zhu, Lihua

doi:10.1103/physrevlett.121.242501

Cited by 28 publications

(13 citation statements)

References 34 publications

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“…This was understood in terms of underlying quasi-deuteron degrees of freedom inside nuclei by Sutter et al [18]. These observations have been confirmed by recent experiments where the coincidence measurement of elastically scattered protons and deuterons are used to investigate the spin-isospin character of SRCs at Osaka [19]. The unexpectedly high deuteron production, observed in numerous experiments using collisions of multi-GeV relativistic protons (for example, the early work of Cocconi et al [20]), may be seen as extension of Azhgirei and Sutter's quasi-deuteron propositions.…”

Section: Introductionmentioning

confidence: 68%

Nucleon-nucleon correlations inside atomic nuclei: synergies, observations and theoretical models

Dalal¹,

MacGregor²

2022

Preprint

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While the main features of atomic nuclei are well described by nuclear mean-field models, there is a large and growing body of evidence which indicates an important additional role played by spatially-correlated nucleon-nucleon structures. The role of nucleonic structures was first suggested by Heidmann in 1950 to explain pick-up reactions of energetic nucleons. Since then a steady flux of new experimental evidence has confirmed the presence of similar structures inside atomic nuclei, dominated by correlations between pairs of nucleons. The role of these internal nucleon-nucleon correlations has been established using various energetic probes like photons, pions, leptons and hadrons. These correlated structures are essential for understanding the interaction of particles with nuclei and their presence provides an explanation of many specific nuclear phenomena including backscattered protons, copious deuteron production, sub-threshold particle production, neutrino interactions with nuclei and the EMC effect. On the theoretical side, these measurements have stimulated a large number of phenomenological models specifically devised to address these enigmatic observations. While reviews exist for specific interactions, there is currently no published commentary which systematically encompasses the wide range of experimental signatures and theoretical frameworks developed thus far. The present review draws together the synergies between a wide range of different experimental and theoretical studies, summarises progress in this area and highlights outstanding issues for further study.

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Section: Introductionmentioning

confidence: 68%

Nucleon-nucleon correlations inside atomic nuclei: synergies, observations and theoretical models

Dalal¹,

MacGregor²

2022

Preprint

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“…It would be interesting to see how Δ spin values are predicated by ab initio calculations (Gysbers et al, 2019) that reproduce the GT transition strengths studied by beta-decay without a quenching factor by introducing the contribution from the two-body current and many-body correlations. The finding would have relevance to the observed np pair dominance in the correlated NN pairs with high relative momentum in nuclei observed by electron scattering (Subedi et al, 2008;Hen et al, 2014;Hen et al, 2017) or by 16 O(p, d) reactions (Ong et al, 2013;Terashima et al, 2018). The electron scattering data probe all the components of the correlated NN pairs due to the high incident energy of the electrons without limitation placed on the excitation energy of the residual nucleus after knockout of a correlated NN pair.…”

Section: Proton-neutron Spin-spin Correlation In the Ground Statementioning

confidence: 78%

“…The short range correlation as well as the tensor correlation are considered to be the origin of the neutron-proton correlation and are relevant to the IS spin-triplet n-p pairing. The high-momentum nature of the correlation has been studied by the knockout reaction by electron scattering (Subedi et al, 2008;Hen et al, 2014;Hen et al, 2017) or by high-momentum transfer reaction by using (p, d) scattering (Ong et al, 2013;Terashima et al, 2018). In both cases, dominant contribution of the n-p pairs is reported rather than the identical pairs, n-n or p-p, to the high-momentum component in the ground state.…”

Section: Introductionmentioning

confidence: 99%

Quenching of Isovector and Isoscalar Spin-M1 Excitation Strengths in N = Z Nuclei

Matsubara

Tamii

2021

Front. Astron. Space Sci.

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Spin-M1 excitations of nuclei are important for describing neutrino reactions in supernovae or in neutrino detectors since they are allowed transitions mediated by neutral current neutrino interactions. The spin-M1 excitation strength distributions in self-conjugate N=Z nuclei were studied by proton inelastic scattering at forward angles for each of isovector and isoscalar excitations as reported in H. Matsubara et al., Phys. Rev. Lett. 115, 102501 (2015). The experiment was carried out at the Research Center for Nuclear Physics, Osaka University, employing a proton beam at 295 MeV and the high-resolution spectrometer Grand Raiden. The measured cross-section of each excited state was converted to the squared nuclear matrix elements of spin-M1 transitions by applying a unit cross-section method. Comparison with predictions by a shell-model has revealed that isoscalar spin-M1 strengths are not quenched from the prediction although isovector spin-M1 strengths are quenched similarly with Gamow-Teller strengths in charged-current reactions. This finding hints at an important origin of the quenching of the strength relevant to neutrino scattering, that is, the proton-neutron spin-spin correlation in the ground state of the target nucleus. In this manuscript we present the details of the unit cross-section method used in the data analysis and discuss the consistency between the quenching of the isoscalar magnetic moments and that of the isoscalar spin-M1 strengths.

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“…However, it is beyond the scope of this article because the kinematics employed in Ref. [33] are completely different from those discussed in this study, in which the proton is emitted to forward angles.…”

Section: Resultsmentioning

confidence: 93%

“…The pn potential (28) cannot generate such a high-momentum component, which is expected to be the reason for the undershooting of the data at backward angles at 250 MeV. Further improvement of this approach will be needed to be applied to the study of the (p, pd) reaction with the backward emission of the proton [33]; the use of a realistic pn interaction will be necessary. However, it is beyond the scope of this article because the kinematics employed in Ref.…”

Section: Resultsmentioning

confidence: 99%

Importance of the deuteron breakup in the deuteron knockout reaction

Chazono¹,

Yoshida²,

Ogata³

2022

Preprint

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Background: An isoscalar pn pair is expected to emerge in nuclei that have similar proton and neutron numbers and it may be a candidate for a deuteron "cluster." There is, however, no experimental evidence for it. Purpose: The purpose of this paper is to construct a new reaction model for the (p, pd) reaction including the deuteron breakup in the elementary process and the deuteron reformation by the final-state interactions (FSIs). How these processes contribute to the observables of the reaction is investigated. Methods: The distorted wave impulse approximation is extended in twofold. The elementary processes of the (p, pd), i.e., the p-d elastic scattering and d(p, p)pn reaction, are described with an impulse picture employing a nucleon-nucleon effective interaction. The three-body scattering waves in the final state of the (p, pd) reaction are calculated with the continuum-discretized coupledchannels method. The triple differential cross section (TDX) of the (p, pd) reaction is calculated with the new model. Results: The elementary processes are described reasonably well with the present model. As for the (p, pd) reaction, the deuteron reformation can either increase or decrease the TDX height depending on the interference between the elastic and breakup channel of deuteron, while the back-coupling effect always decreases it. Conclusions: It is shown that the deuteron reformation significantly changes the TDX of the (p, pd) reaction through the interference. It is important to include this process to quantitatively discuss the (p, pd) cross sections in view of the deuteron formation in nuclei. For more quantitative discussion regarding the experimental data, further improvement will be necessary.

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Dominance of Tensor Correlations in High-Momentum Nucleon Pairs Studied by (p,pd) Reaction

Cited by 28 publications

References 34 publications

Nucleon-nucleon correlations inside atomic nuclei: synergies, observations and theoretical models

Nucleon-nucleon correlations inside atomic nuclei: synergies, observations and theoretical models

Quenching of Isovector and Isoscalar Spin-M1 Excitation Strengths in N = Z Nuclei

Importance of the deuteron breakup in the deuteron knockout reaction

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