Measurement of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>12</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(π,2π) reactions and possible evidence of a double-Δ excitation

Rahav, A.; Alster, J.; Ashery, D.; Lichtenstadt, J.; Navon, I. M.; Piasetzky, E.; Amaudruz, P.; Botje, M.; Burger, W. J.; Ingram, C.H.Q.; Schumacher, R. A.; Sennhauser, U.; Wood, S. A.

doi:10.1103/physrevlett.66.1279

Cited by 24 publications

(13 citation statements)

References 18 publications

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“…They found that the cross section for this process increases rapidly with incident pion energy, from about 15%%uo of the DCX cross section at 240 MeV to one-third to one-half of the DCX cross section at 270 MeV. This prediction, 1.96 mb for ' 0 at E;", =270 MeV, is consistent with the experimental result of Grion et al [46], but exceeds that of Rahav et al [47] by about a factor of 3. Some of these theoretical results are compared with the present data in Figs.…”

Section: -supporting

confidence: 73%

“…Inclusion of production does allow the theoretical cross sections to agree with those measured at 270 MeV. However, as mentioned previously, the present data for the doubly differential cross sections at this incident energy, which the calculation exceeds in the region of the spectrum in which pion production is kinematically allowed, as well as the (n, 2m') measurements of Rahav et al [47,48], indicate that this effect may have been overestimated by the authors of Ref. [30].…”

Section: -supporting

confidence: 51%

“…At PSI, Rahav et al [47] ob-. served the isospin-symmetric reaction (n, rr mr+ ) on ' C at 292 MeV and obtained an integrated cross section of 978+109 pb.…”

Section: Background Reactionsmentioning

confidence: 99%

“…[46] and 0.64+0.07 mb from that of Rahav et al. [47,48]. If one simply takes the free-nucleon cross section [36] and multiplies it by N, z, one obtains [27] 1.1 mb.…”

Section: Background Reactionsmentioning

confidence: 99%

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

et al. 1992

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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,

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Section: -supporting

confidence: 73%

Section: -supporting

confidence: 51%

“…At PSI, Rahav et al [47] ob-. served the isospin-symmetric reaction (n, rr mr+ ) on ' C at 292 MeV and obtained an integrated cross section of 978+109 pb.…”

Section: Background Reactionsmentioning

confidence: 99%

“…[46] and 0.64+0.07 mb from that of Rahav et al. [47,48]. If one simply takes the free-nucleon cross section [36] and multiplies it by N, z, one obtains [27] 1.1 mb.…”

Section: Background Reactionsmentioning

confidence: 99%

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

et al. 1992

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“…Most other π2π measurements deal only with total cross sections. These include old data taken with emulsion techniques [20], and more recently, with a magnetic spectrometer similar to CHAOS [21]. Since π2π total cross sections are not part of the present discussion, these data will not be considered in this work.…”

Section: Introductionmentioning

confidence: 99%

The ππ interaction in nuclear matter from a study of the πA→ππA′ reactions

et al. 2000

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The pion-production reactions π + A → π + π ± A ′ were studied on 2 H, 12 C, 40 Ca, and 208 P b nuclei at an incident pion energy of T π + =283 MeV. Pions were detected in coincidence using the CHAOS spectrometer. The experimental results are reduced to differential cross sections and compared to both theoretical predictions and the reaction phase space. The composite ratio C A ππ between the π + π ± invariant masses on nuclei and on the nucleon is also presented. Near the 2m π threshold pion pairs couple to (ππ) I=J=0 when produced in the π + → π + π − reaction channel. There is a marked near-threshold enhancement of C A π + π − which is consistent with theoretical predictions addressing the partial restoration of chiral symmetry in nuclear matter. Furthermore, the behaviour of C A π + π − is well described when the restoration of chiral symmetry is combined with standard Pwave renormalization of pions in nuclear matter. On the other hand, nuclear matter only weakly influences C A π + π + , which displays a flat behaviour throughout the energy range regardless of A.

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The reaction ? +d ? ?+ + ?? +p + n between 570 and 850 MeV and? ++ ? ? production

Asai

Endo

Harada

et al. 1992

Z. Physik A - Hadrons and Nuclei

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The reaction 7+d---~ + +~ +p+n has been measured in a kinematically complete way at incident photon energies from 570 to 850 MeV in steps of 40 MeV. From detailed comparison of measured data with results of event simulations, it is concluded that three different mechanisms, the quasi-free, double-delta and phase space productions, contribute to the reaction. Each of the cross sections corresponding to these mechanisms is determined separately.

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Measurement of theC12(π,2π) reactions and possible evidence of a double-Δ excitation

Cited by 24 publications

References 18 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

The ππ interaction in nuclear matter from a study of the πA→ππA′ reactions

The reaction ? +d ? ?+ + ?? +p + n between 570 and 850 MeV and? ++ ? ? production

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