Search for supernarrow dibaryons in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>pd</mml:mi></mml:math>interactions

Filʼkov, L.V.; Kashevarov, V. L.; Konobeevski, E. S.; Mordovskoy, M. V.; Potashev, S. I.; Skorkin, V. M.

doi:10.1103/physrevc.61.044004

Cited by 16 publications

(35 citation statements)

References 16 publications

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“…The first two of them confirmed the values of the dibaryon mass obtained by us earlier [1][2][3] and the resonance at 1942 MeV is a new one. It is expected [3,6] that isoscalar SNDs contribute mainly into γd channel and isovector SNDs do into γNN one. As the main decay of the found dibaryons is observed into pX 1 channel, it is possible to assume that X 1 = γ + n and all these states are isovector SNDs.…”

supporting

confidence: 76%

“…As was shown in Ref. [2,3], the nucleons and the deuteron from the decay of SND into γNN and γd have to be emitted in a narrow angle cone with respect to the direction of motion of the dibaryon. On the other hand, if a dibaryon decays mainly into two nucleons, then the expected angular cone of emitted nucleons must be more than 50 • .…”

mentioning

confidence: 99%

“…Experiment was performed using the spectrometer TAMS, the properties of which were described elsewhere [3]. CD 2 and C 12 were used as targets.…”

mentioning

confidence: 99%

“…[1][2][3] the study of the reaction pd → pX was performed with the aim of searching for supernarrow dibaryons (SND), the decay of which into two nucleons is forbidden by the Pauli exclusion principle [4][5][6]. Such dibaryons with the mass M < 2m N + m π can decay into two nucleons, mainly emitting a photon.…”

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confidence: 99%

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Fishing for narrow dibaryons in pd→pX reaction

Filʼkov¹,

Kashevarov²,

Konobeevski³

et al. 2000

AIP Conference Proceedings

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Abstract. An analysis of new experimental data, obtained at Linear Accelerator of INR, is carried out with the aim of searching for supernarrow dibaryons in the reactions pd → p + X and pd → p + pX 1 . Dibaryons with masses 1904±2, 1926±2, and 1942±2 MeV have been observed in missing mass M X spectra. In missing mass M X1 spectra, the resonancelike states X 1 = γ + n at M X1 = 966 ± 2, 986±2, and 1003±2 MeV have been found. The analysis of the data obtained leads to the conclusion that the observed dibaryons are supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle.In Ref. [1][2][3] the study of the reaction pd → pX was performed with the aim of searching for supernarrow dibaryons (SND), the decay of which into two nucleons is forbidden by the Pauli exclusion principle [4][5][6]. Such dibaryons with the mass M < 2m N + m π can decay into two nucleons, mainly emitting a photon. The experiment was carried out at 305 MeV using the two-arm spectrometer TAMS. As was shown in Ref. [2,3], the nucleons and the deuteron from the decay of SND into γNN and γd have to be emitted in a narrow angle cone with respect to the direction of motion of the dibaryon. On the other hand, if a dibaryon decays mainly into two nucleons, then the expected angular cone of emitted nucleons must be more than 50 • . Therefore, a detection of the scattered proton in coincidence with the proton (or the deuteron) from the decay of particle X at correlated angles allowed to suppress essentially the contribution of the background processes and to increase the relative contribution of a possible SND production. As a result, two narrow peaks in missing mass spectra have been observed at M =1905 and 1924 MeV. The analysis of the angular distributions of the protons from the decay of particle X showed that the peak found at 1905 MeV most likely corresponds to a SND with isotopic spin equal to 1. In Ref.[3] arguments were presented for the resonance at M =1924 MeV is a SND, too.In the present paper we give the results of an analysis of new experimental data

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supporting

confidence: 76%

mentioning

confidence: 99%

“…Experiment was performed using the spectrometer TAMS, the properties of which were described elsewhere [3]. CD 2 and C 12 were used as targets.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Fishing for narrow dibaryons in pd→pX reaction

Filʼkov¹,

Kashevarov²,

Konobeevski³

et al. 2000

AIP Conference Proceedings

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“…The nonstrange NN-decoupled dibaryons with small widths could be the most promising and easy for experimental searches. Among available candidates to be confirmed (or rejected) in future dedicated and, hopefully, more sensitive experiments we wish to mention the earlier claimed indication of the existence of a narrow d' dibaryon slightly above the 7rNN threshold, coming from the data on pion double charge exchange on nuclei [2], d~-enhancement below the ~rNN-threshold, seen in the data on the proton-proton double bremsstrahlung at about 200 MeV [3,4] and several peaks observed in the reaction pd ~ pX and interpreted as the excitation of dibaryon resonances with masses around 1903, 1920, and 1940 MeV [5].…”

Section: Introductionmentioning

confidence: 96%

Possible exotic resonance effects in two-photon—two-nucleon processes

Gerasimov

2001

Czech J Phys

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The discussion is given of a structure in the cross section of double-photon production pp --~ 2~/X below the pion threshold, observed recently by the Dib27 Collaboration (JINR) and interpreted as a positive indication of the excitation of an exotic NN-decoupled resonance in this reaction, as well as of the related questions on possible exotic resonance effects in elastic Compton scattering on the deuteron and radiative pion capture in the pionic deuterium.

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New evidence for supernarrow dibaryons production in pd interactions

et al. 2001

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The reaction pd → pX at 305 MeV is studied with the aim to search for supernarrow dibaryons, the decay of which into two nucleons is forbidden by the Pauli exclusion principle. The experiment was carried out at the Moscow Meson Factory using the spectrometer TAMS, which detected the scattered proton and another charged particle (either p or d) from the decay of X. Narrow peaks in missing mass spectra have been observed at 1905 and 1924 MeV. Comparison of the obtained data with theoretical predictions leads to the conclusion that the peak found at 1905 MeV most likely corresponds to a supernarrow dibaryon with the isotopic spin equal to 1. The possible origin of the peak at 1924 MeV is also discussed.

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Search for supernarrow dibaryons inpdinteractions

Cited by 16 publications

References 16 publications

Fishing for narrow dibaryons in pd→pX reaction

Fishing for narrow dibaryons in pd→pX reaction

Possible exotic resonance effects in two-photon—two-nucleon processes

New evidence for supernarrow dibaryons production in pd interactions

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