Proton momentum spectra in high-energy reactions of 9Be and 12C with quasimonochromatic photons

K, Baba; Endo, I.; Fukuma, H.; Inoue, K.; Kawamoto, T.; Ohsugi, T.; Sumi, Y.; Takeshita, T.; Uehara, S.; Yano, Y.; Mäki, T.

doi:10.1016/0375-9474(84)90313-0

Cited by 12 publications

(9 citation statements)

References 25 publications

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“…Pion absorption reactions [2] have led to copious deuteron ejection (up to 25% compared to the yield of ejected protons or neutrons) from nuclei. Similar observations were reported by Baba et al in 1984 for photons of multi-hundred MeV energies [15]. A significant fraction of energetic photon and pion absorption events result in either the predominant and simultaneous ejection of kinematically correlated proton-neutron pairs, or the emission of deuterons.…”

Section: Introductionsupporting

confidence: 86%

“…The differential cross-section vs momentum spectra of protons for targets 2 H, 4 He, 9 Be, 12 C at E γ = 357±10 MeV and observation angle 30 • ±4 • are shown in figure 5. The striking similarity of momenta curves for different light nuclei demonstrates that the leading proton production mechanisms in these nuclei are same as those of 2 H. Baba et al [40] extended the validity of these conclusions for 9 Be and 12 C up to 620 MeV photon energy. The explicit nature of the proton origin from these two mechanisms has been established using coincidence measurements of protons with outgoing pions/nucleons [41,42].…”

Section: Interaction Of Energetic Photons (E γ > 40 Mev) With Nucleimentioning

confidence: 71%

“…At higher energies, systematic investigations of the photo-disintegration of light nuclei above the pion emission threshold have now been carried out at a range of tagged photon facilities [39,40,41,42]. Using photons of energy 180-420 MeV, Homma et al [39] showed that energetic protons are emitted by two main mechanisms: (a) Pion photo-production from a quasi-free nucleon (γ + N → p + π) and (b) Photodisintegration of a quasi-free two-nucleon system (γ + pN → p + N ).…”

Section: Interaction Of Energetic Photons (E γ > 40 Mev) With Nucleimentioning

confidence: 99%

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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: Introductionsupporting

confidence: 86%

Section: Interaction Of Energetic Photons (E γ > 40 Mev) With Nucleimentioning

confidence: 71%

Section: Interaction Of Energetic Photons (E γ > 40 Mev) With Nucleimentioning

confidence: 99%

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

Dalal¹,

MacGregor²

2022

Preprint

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“…However, the kinematical condition of the (γ,p) reaction in Ref. [51] is different from that of the η-nucleus system formation reaction in Section 4.1. Hence, we need to use theoretical models and/or more appropriate experimental data to improve the background estimation.…”

Section: Background Considerationmentioning

confidence: 99%

“…4.1. On the other hand, experimental data [51] showed that the differential cross section of the inclusive 12 C(γ,p) reaction is d 2 σ/dΩdp < ∼ 0.9 [µb/(sr MeV/c)]…”

Section: Background Considerationmentioning

confidence: 99%

Formation of mesic nuclei by reactions

Nagahiro¹,

Jido²,

Hirenzaki³

2005

Nuclear Physics A

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We present a theoretical study on formation rates of η and ω meson-nucleus systems induced by (γ, p) reactions on nuclear targets at ideal recoilless condition. We find that the smaller distortion effect in the (γ, p) reaction enables us to investigate properties of the mesons created deeply inside nucleus more clearly. We also consider excitation of scalar-isoscalar (σ) mode in nucleus in order to investigate spectral enhancement around two-pion threshold caused by partial restoration of chiral symmetry. We conclude that valuable information of meson-nucleus interactions can be extracted from global structure of the missing mass spectra in the (γ, p) reaction.

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