Measurement of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow><mml:mi>n</mml:mi></mml:mat

Bjork, C. W.; Jones, Steven E.; King, Thomas; Manley, D. M.; Oyer, A. T.; Rebka, G. A.; Walter, John B.; Carawon, R.; Gram, P. A. M.; Shively, F.; Bordner, C. A.; Lomon, Earle L.

doi:10.1103/physrevlett.44.62

Cited by 71 publications

(12 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…served the isospin-symmetric reaction (n, rr mr+ ) on ' C at 292 MeV and obtained an integrated cross section of 978+109 pb. If one assumes that the (vr, 2m } cross section in nuclei has the same energy dependence as that for the p (m, m m+ )n process [36,45] and that it scales approximately with an effective number of nucleons (N,ft), [44] then one can estimate from these measurements the contribution of the (m, 2m) process to the DCX cross sections measured in the present experiment. Unfortunately, the TRIUMF and PSI results are not mutually consistent.…”

Section: Background Reactionsmentioning

confidence: 96%

“…For the reaction (m, n. +) on ' 0, pion-induced pion production on the hydrogen in the water target contributed to the apparent DCX yield. At 240 MeV the integrated cross section for the n +p~m ++ vr +n reaction [36,45] is about 100 pb, which increased the apparent DCX yield by 3.5%. At lower energies this background reaction becomes insignificant (the threshold energy is 172 MeV).…”

Section: Background Reactionsmentioning

confidence: 99%

See 1 more Smart Citation

Systematics of inclusive pion double charge exchange in the delta resonance region

et al. 1992

Self Cite

View full text Add to dashboard Cite

A systematic study of inclusive pion double charge exchange is reported for nuclei between A = 16 and A =208. The doubly differential cross sections for the A(m. +,~) and A(m, m+) reactions in ' 0, Ca, ' Rh, and 'Pb were measured at incident energies between 120 and 270 MeV at three to five outgoing pion angles. Pion spectra were measured over the energy range from 10 MeV to the kinematic limit for double charge exchange. Integrating these spectra over outgoing pion energy generated angular distributions, and subsequently integrating these angular distributions generated total reaction cross sections. The shapes of the measured spectra are compared with those determined by the distribution of events in four-body phase space and with those predicted by a model in which the pion undergoes two sequential single charge exchanges on nucleons in a Fermi gas. The cross sections are compared with predictions of cascade calculations in which more than two interactions, including pion absorption and scattering without charge exchange, may occur. PACS number(s): 25.80.Gn, 25.80. Hp, 25.80.Ls major objective was to satisfy persistent curiosity about 'Present address: Continuous Beam Electron Accelerator Facility,

show abstract

Section: Background Reactionsmentioning

confidence: 96%

Section: Background Reactionsmentioning

confidence: 99%

Systematics of inclusive pion double charge exchange in the delta resonance region

et al. 1992

Self Cite

View full text Add to dashboard Cite

show abstract

“…π − p → π + π − n; Experimental points from refs. [26,27]. Middle box:π − p → π 0 π 0 n; Data from refs.…”

Section: Roper Resonancementioning

confidence: 99%

Scalar isoscalar pion pairs in nuclei and theA(π,ππ)Xreaction

Vacas

Oset

1999

Phys. Rev. C

View full text Add to dashboard Cite

The reaction A(π, ππ)X has been studied at low energies, paying particular attention to the interaction of the two final pions in the scalar isoscalar (I=J=0) channel. We have developed a microscopic model for the pion production, and then implemented the two pion final state interaction by using the results of a non-perturbative unitary coupled-channels method based in the standard chiral Lagrangians. The resulting model, describes well the reaction on the nucleon for all different isospin channels. Finally, we have considered the reaction in nuclei. Our calculation takes into account Fermi motion, Pauli blocking, pion absorption, and also the strong modification of the ππ interaction in the nuclear medium.13.60. Le,13.75.Lb,13.75.Gx,21.65+f,25.80.Hp

show abstract

“…Then the absolute values of the threshold amplitudes M 0 X might be expressed in terms of threshold limits of the experimental quasi-amplitudes (15):…”

Section: Threshold Propertiesmentioning

confidence: 99%

“…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%

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

Bolokhov

Polyakov²,

Sherman³

1998

EPJ A

View full text Add to dashboard Cite

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

show abstract

Measurement ofπ−p→π−π+n

Cited by 71 publications

References 27 publications

Systematics of inclusive pion double charge exchange in the delta resonance region

Systematics of inclusive pion double charge exchange in the delta resonance region

Scalar isoscalar pion pairs in nuclei and theA(π,ππ)Xreaction

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

Contact Info

Product

Resources

About