Nucleon-nucleon resonances

Auer, I.P.

doi:10.1016/0375-9474(80)90176-1

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…1 So far, the only available data which might show some evidence for such states come from N-N scattering experiments. 2 We report in this paper two experiments that have looked for dibaryon resonances in the JViV7r channel. They were performed with use of the bremsstrahlung photon beam of the linac at Saclay.…”

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confidence: 99%

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
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The measured d(y 9 p)X cross section shows a rapid variation around a photon energy k = 390 MeV, not explained up to now by pion or nucleon rescattering processes. It is suggested that this and other related results could be explained by the existence of a dibaryonic resonance at a mass of 2.23 GeV/c 2 . 13.60.Rj, 25.20.+y One of the unanswered questions at the frontier between nuclear and particle physics is related to the possible existence of nonstrange dibaryon resonances. Such resonances are predicted by the existing models of strong interactions. 1 So far, the only available data which might show some evidence for such states come from N-N scattering experiments. 2 We report in this paper two experiments that have looked for dibaryon resonances in the JViV7r channel. They were performed with use of the bremsstrahlung photon beam of the linac at Saclay. In the first experiment, the reaction d(y,pif)p was investigated by detecting the emitted pion in coincidence with one of the two protons. The momenta of the particles were also measured so as to determine completely the kinematics of the reaction. The great advantage of this method lies in the possibility of reducing the contribution of the dominant process, namely the quasifree photoproduction, by considering different momenta P R of the recoiling system. Similarly to previous works, 3 we detected the pion with the "400"-MeV/ c magnetic spectrometer, but in order to achieve good resolution for P R (AP R ^ 10 MeV/c) and also to eliminate the large corrections brought in by the use of a range telescope, we detected the proton with the "700"-MeV/c magnetic spectrometer. 4 We kept constant the momentum P R of the undetected proton (P R = 150 MeV/c), the invariant mass Q of the pion-nucleon system (Q = 1245 MeV/c 2 ) and the angle co of the pion relative to the incident photon in the pion-nucleon rest frame (co = 105°). We varied only the angle 6 R of the recoiling proton and hence the photon energy k, since these are kinematically related. In order to compare our new data with the previous results 3 obtained for various kinematical conditions (1225<105°), we have plotted on the same figure (Fig. 1) and as a function of k the measured counting rates divided by the predic-tion of the first-order quasifree model (impulse approximation). The new set of data thus confirms the rapid variation of the cross section around k = 400 MeV.The results of a calculation 5 that takes into account the quasifree photoproduction process and the pion and proton rescattering up to the second order are also shown in Fig. 1. Although this model can successfully account for previous experimental results, 4 it fails to reproduce the observed bump (x 2 = 43 for y = 11 degrees of freedom). At the present time this discrepancy is very difficult to explain in terms of contributions from rescattering processes, such as the A-JV scattering. 6 It should be pointed out here that this peculiar behavior of the energy distribution 1. 5 L .0.5 Yd-ppTT ...

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mentioning

confidence: 99%

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
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“…3 ) Arndt has recently extended his phase-shift analysis and confirmed these results. 4 Dinucleon Resonances and 7r-Deuperon Elastic Scattering Amplitudes constituents of nuclei. The small elasticities of 1 D2 and 3 F3 might suggest that these dibaryons are composed of two nucleons and pion(s), if we consider them in terms of the nuclear theory.…”

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confidence: 99%

Dinucleon Resonances and -Deuteron Elastic Scattering Amplitudes

Kanai

Minaka

Nakamura

et al. 1981

Progress of Theoretical Physics

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The effects of dinucleon resonances in x-deuteron elastic process are discussed. We first construct the background amplitudes using the Glauber model and investigate them in detail. A dinucleon formation term is superimposed on the background part. We examine all the world data of x-deuteron elastic scattering around dinucleon energy regions and have found that, except around 600 Me V / c, they can be well explained by introducing the dinucleon resonances which are suggested in pp scattering. § 1. Introduction ) The existence of these two dibaryon resonances in proton-proton (p-p) channel is now beyond doubt.Study of dibaryon resonances will be an important area in nuclear and/ or elementary particle physics .. It is very difficult to produce resonance states of two protons using usual nuclear potential. If we want to interpret the dibaryon state as a new type of nucleus, we will have to introduce a new degree of freedom into the conventional nuclear theory where only nucleons are considered as

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Pion production off light nuclei

Laget

From Collective States to Quarks in Nuclei

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Nucleon-nucleon resonances

Abstract: Recent measurements of pp (and pd) total cross section with Polarized beams and target have revealed unexpected structure.!'-One interpretation of the Structure requires the existence of nucleon-nucleon resonances. 3 brail recn on of brail and

Cited by 9 publications

References 15 publications

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
View full text Add to dashboard Cite

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
View full text Add to dashboard Cite

Dinucleon Resonances and -Deuteron Elastic Scattering Amplitudes

Pion production off light nuclei

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Nucleon-nucleon resonances

Abstract: Recent measurements of pp (and pd) total cross section with Polarized beams and target have revealed unexpected structure.!'-One interpretation of the Structure requires the existence of nucleon-nucleon resonances. 3 brail recn on of brail and

Cited by 9 publications

References 15 publications

Possible Dibaryon Resonance around 2.23GeV/c2ind(Argan1, Audit2, Botton3 et al. 1981Phys. Rev. Lett.26020View full textAdd to dashboardCite

Possible Dibaryon Resonance around 2.23GeV/c2ind(Argan1, Audit2, Botton3 et al. 1981Phys. Rev. Lett.26020View full textAdd to dashboardCite

Dinucleon Resonances and -Deuteron Elastic Scattering Amplitudes

Pion production off light nuclei

Contact Info

Product

Resources

About

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
View full text Add to dashboard Cite

Possible Dibaryon Resonance around 2.23GeV/c2ind(
Argan¹,
Audit²,
Botton³
et al. 1981
Phys. Rev. Lett.
26
0
2
0
View full text Add to dashboard Cite