An eight-litre hydrogen—deuterium bubble chamber in a magnetic field

Blokhintseva, T.D.; Василенко, А. Т.; Grebinnik, V. G.; Жуков, В. А.; Libman, G.; Nemenov, L.L.; Selivanov, G.I.; Fang, Huang

doi:10.1016/0011-2275(64)90032-3

Cited by 4 publications

(7 citation statements)

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“…energy for the neutron. This same effect was observed by Kirz et a/., 9 Barish et al20 and Blokhintseva et al26 These low-neutron energies correspond to a dipion effective mass in the range (near w gnr = s 400 MeV) where several authors report 7 -0 two-pion resonances 27. ""29 …”

supporting

confidence: 68%

Angular Distribution of Charge Exchange and Inelastic Neutrons inπ−−pInteractions at 313 and 371 MeV

et al. 1965

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Neutron angular distributions from the charge-exchange (71%) and inelastic modes (7r 0 ir°n, Tr + ir~n) of the ir~~-p interaction have been investigated at 313 and 371 MeV incident-pion kinetic energy. The data were obtained with an electronic counter system. Elastic and inelastic neutrons were separated in the all-neutral final states by time of flight. At both energies the charge-exchange differential cross section at the forward neutron angles differs from that determined by Caris et al. from measurements of the 7r°-decay gamma distributions, but generally agrees with the phase-shift-analysis calculations of Roper. The distribution of inelastic neutrons from both modes shows a strong preference for low center-of-mass neutron energies. The distribution of these neutrons does not correspond to that expected from the 1 = 0, W-TT interaction (ABC effect) suggested to account for the anomaly in p-d collisions observed by Abashian et aL Finally, all available charge-exchange differential-cross-section data from this and other experiments were combined by a least-squares fit to a Legendre expansion of the form

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supporting

confidence: 68%

Angular Distribution of Charge Exchange and Inelastic Neutrons inπ−−pInteractions at 313 and 371 MeV

et al. 1965

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“…The data from Refs. [24,25,26] for π + p → π + π + n, [27,28,29,30,31,32,33,34,35,36] for π − p → π + π − n, and [37,38,39,40,41] for π − p → π 0 π 0 n. section indicates the increase by about 25 % with R N ∆ = 0.4 and 65 % with R N ∆ = 0.8 around T π = 300 MeV. These two channels exhibit large influence of the π∆∆ interaction on the total cross section.…”

Section: Resultsmentioning

confidence: 99%

Δ(1232)inπN→ππNreaction

Kammano

Masaki

2004

Phys. Rev. C

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The contribution of ∆(1232) to the πN → ππN reaction is examined by making use of the chiral reduction formula developed by Yamagishi and Zahed. The influence of the π∆∆ and ρN ∆ interactions on this reaction, which has not been regarded as important so far, is considered for all channels with the initial π ± p states. The total cross sections are calculated to tree level for the energy up to T π = 400 MeV. Although the π∆∆ and ρN ∆ interactions give a small effect on the π + p → π + π + n, π − p → π + π − n, and π − p → π 0 π 0 n channels, the π ± p → π ± π 0 p channels are found to be sensitive to these interactions.

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“…We are using the total cross sections data [3], [4], [5], [6], [7], [9], [15], [16], [17], [18], [25], [26], [28], [38], [41], [42], [43], [45], [46], [48], [49], [53], [64], [66], [71], [72], [76]. 94 points were selected on the grounds of the compatibility analysis of the paper [80] from the total list of 105 experimental points.…”

Section: Experimental Basementioning

confidence: 99%

“…3. consists of the experimental total cross sections and 1-dimensional distributions. The full-kinematics data of the work [17] also had been presented in the same form. This needs some comments.…”

Section: Datamentioning

confidence: 99%

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Phenomenological πN→ππN amplitude and analysis of low energy data on total cross sections and 1--D distributions

Bolokhov

Polyakov²,

Sherman³

1998

EPJ A

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We develop the phenomenological amplitude of the πN → ππN reaction describing the exchanges of ∆ and N * along with the OPE mechanism. The contribution of the latter contains 4 independent low energy parameters (up to O(k 4 ) order). The terms of the polynomial background are added to stand for far resonances and for contact terms originating from the off-mass-shell interactions. These terms are introduced with the account of isotopic, crossing, C, P and T symmetries of strong interactions.The data consisting of total cross sections in the energy region 0.300 ≤ P Lab ≤ 500 MeV/c and 1D distributions from the bubble-chamber experiments for three reaction channels were undergoing fittings to determine free parameters of the amplitude. The best solutions are characterized by χ 2 DF = 1.16. At the considered energies the isobar exchanges are found to be more important than OPE. The obtained solutions reveal the need in more precise data and/or in polarization measurements because of large correlations of isobar parameters with the OPE ones.The theoretical solutions were used for modeling the Chew-Low extrapolation and the Olsson-Turner threshold approach. It is shown that the noncritical application of the former results in 100% theoretical errors, the extracted values being in fact the random numbers. The results of the Olsson-Turner method are characterized by significant systematic errors coming from unknown details of isobar physics. Sankt-Petersburg 1997

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An eight-litre hydrogen—deuterium bubble chamber in a magnetic field

Cited by 4 publications

References 1 publication

Angular Distribution of Charge Exchange and Inelastic Neutrons inπ−−pInteractions at 313 and 371 MeV

Angular Distribution of Charge Exchange and Inelastic Neutrons inπ−−pInteractions at 313 and 371 MeV

Δ(1232)inπN→ππNreaction

Phenomenological πN→ππN amplitude and analysis of low energy data on total cross sections and 1--D distributions

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