Pion Charge Exchange on Tritium

Glodis, P.F.; Brändle, H.; Haddock, R. P.; Kostoulas, I.; Matz, N.; Nefkens, B. M. K.; Plumlee, W.; Sander, O.R.; Pratt, J.C.; Sherman, R.H.; Shively, F.; Spencer, J.E.

doi:10.1103/physrevlett.44.234

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…Experimental data at backward angles obtained in Ref. [53] by detecting the recoiling 3 He are in excellent agreement with our calculations performed in the framework of the three-body model. Similar results have been obtained by Landau [4,6] with phenomenological nuclear form factors.…”

Section: Pion Single Charge Exchangesupporting

confidence: 89%

“…Experimental data for the (m+, vr ) reaction are from Ref. [53], data for the (vr, vr ) reaction are from Ref. [54] (~) and Ref.…”

Section: Pion Single Charge Exchangementioning

confidence: 99%

“…spectively. Experimental data are from [53] for SCE and [41] for elastic scattering. For the elementary xN -+ AN process the experimental data is much less complete and accurate in contrast to~¹cattering data.…”

Section: Pion Single Charge Exchangementioning

confidence: 99%

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Pion interaction with the trinucleon up to the eta production threshold

1993

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Pion elastic, charge exchange scattering and induced eta production on the trinucleon systems are investigated in a coupled-channels approach in momentum space with Fadeev wave functions. The channel $\pi N \rightarrow \eta N$ is included using an isobar model with S-, P-, and D-wave resonances. While the coherent reactions like $^3$He($\pi,\pi)^3$He can be reasonably well reproduced up to $T_{\pi}$=500 MeV, large discrepancies appear for the incoherent processes, $^3$He($\pi^-,\pi^0)^3$H and $^3$He($\pi^-,\eta)^3$H at backward angles and energies above $\Delta$-resonance. In the forward direction the $(\pi,\eta)$ calculations underestimate the experimental measurements very close to threshold but agreement with the data improves with increasing pion energy. Predictions are made for the asymmetries of the various reactions on polarized $^3$He.Comment: 40 pages, 12 figures (available from the authors), Mainz preprint MKPH-T-92-1

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Section: Pion Single Charge Exchangesupporting

confidence: 89%

“…Experimental data for the (m+, vr ) reaction are from Ref. [53], data for the (vr, vr ) reaction are from Ref. [54] (~) and Ref.…”

Section: Pion Single Charge Exchangementioning

confidence: 99%

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Pion interaction with the trinucleon up to the eta production threshold

1993

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“…The yield was estimated with the help of a Monte Carlo simulation [18] that included the magnetic transport properties of the spectrometer, the momentum spread of the incident beam, energy loss in the targets, and the response of its focal plane detectors to predict the shape of the momentum spectrum for a given reaction. [20) at 148 MeV. The solid curve represents a mN T-matrix calculation by Gibbs [8]; the dashed and dotted curves are the non-spin-Hip and spin-Qip contributions, respectively.…”

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confidence: 99%

Measurement of theH3(π+

et al. 1995

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Measurements of the di8'erential cross section for the pion-induced isobaric analog transition in the A=3 system are presented. This measurement, in which low energy recoiling nuclei were detected, is the first at forward pion angles and incident energies where the spin Hip (AS = 1) contribution to the di8'erential cross section is predicted to have its strongest infiuence. Although the data are not suKciently accurate to support a definitive conclusion, they agree best with a calculation that includes this contribution. PACS number(s): 25.80. Dj, 25.80.Gn, 27.10.+hThe excitation of an isobaric analog state through pion charge exchange is an important reaction channel in pionnucleus interactions. This reaction is often referred to as elastic charge exchange since the initial and final nuclear states are identical except for the third component of isospin. The three-nucleon system is the simplest system in which an isobaric analog transition may be observed, i.e. , H(sr+, ao)sHe or He(n, vr ) H.In 1975, Sparrow [1] predicted that the spin-flip (AS = 1) contribution to the elastic charge exchange reaction should be quite large in the three-nucleon system at incident pion energies between 100 and 200 MeV, viz. , a factor of up to 5 enhancement in the diAerential cross ection in the region of the non-spin-flip (ES = 0) minimum. Subsequently, several authors [2 -11] have calculated cross sections for elastic scattering and single charge exchange. The important features of these charge exchange calculations are a strongly forward-peaked angular dependence and a nearly Qat energy dependence for the total cross section in the 4-resonance region. This energy dependence is perhaps surprising when compared to the strongly peaked energy dependence for charge exchange on a free nucleon and for pion elastic scattering on A = 3 nuclei.The pion-induced isobaric analog transition between He and H may be observed in four diferent ways. Either the He(vr, vr ) H or H(sr+, 7r ) He reaction may be observed by detecting either a neutral pion or a recoil nucleus. As the diAerential cross section decreases by roughly two orders of magnitude from forward to backward a angles, the peak in the vr spectrum associated with this transition becomes quite small compared with the yield from quasifree charge exchange. In the only previous measurement at forward angles, in which the vr was detected, the isobaric analog peak became indistin-0556-2813

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Pion interaction withA > 2 nuclei

Mach¹

1982

Czech J Phys

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Pion Charge Exchange on Tritium

Cited by 6 publications

References 9 publications

Pion interaction with the trinucleon up to the eta production threshold

Pion interaction with the trinucleon up to the eta production threshold

Measurement of theH3(π+

Pion interaction withA > 2 nuclei

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