Pion electroproduction in the 3He(e,e′π+)3H reaction at intermediate energies

K. I. Blomqvist; W. U. Boeglin; R. Böhm; M. Distler; R. Edelhoff; J. Friedrich; R. Geiges; M. Kahrau; S. Kamalov; M. Kirchbach; M. Kohl; M. Korn; H. Kramer; K. W. Krygier; V. Kunde; M. Kuss; J. M. Laget; A. Liesenfeld; K. Merle; R. Neuhausen; E. A.J.M. Offermann; Th Pospischil; M. Potokar; C. Rangacharyulu; A. Richter; A. W. Richter; A. Rokavec; G. Rosner; P. Sauer; St Schardt; G. Schrieder; T. Suda; L. Tiator; B. Vodenik; A. Wagner; Th Walcher; St Wolf

doi:10.1016/S0375-9474(97)00463-6

Pion electroproduction in the ³He(e,e′π⁺)³H reaction at intermediate energies

K. I. Blomqvist, W. U. Boeglin, R. Böhm, M. Distler, R. Edelhoff, J. Friedrich, R. Geiges, M. Kahrau, S. Kamalov, M. Kirchbach, M. Kohl, M. Korn, H. Kramer, K. W. Krygier, V. Kunde, M. Kuss, J. M. Laget, A. Liesenfeld, K. Merle, R. NeuhausenE. A.J.M. Offermann, Th Pospischil, M. Potokar, C. Rangacharyulu, A. Richter, A. W. Richter, A. Rokavec, G. Rosner, P. Sauer, St Schardt, G. Schrieder, T. Suda, L. Tiator, B. Vodenik, A. Wagner, Th Walcher, St Wolf

Research Center for Electron Photon Science (ELPH)

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

The differential coincident pion electroproduction cross section in the ³He(e,e′π⁺)³H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies E₀ = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q² = 0.045 GeV², with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Three-body Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included.

Original language	English
Pages (from-to)	871-885
Number of pages	15
Journal	Nuclear Physics A
Volume	626
Issue number	4
DOIs	https://doi.org/10.1016/S0375-9474(97)00463-6
Publication status	Published - 1997 Dec 1

Keywords

Coherent pion electroproduction
Delta resonance region
Longitudinal-transverse separation
Medium effects
he

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/S0375-9474(97)00463-6

Cite this

Blomqvist, K. I., Boeglin, W. U., Böhm, R., Distler, M., Edelhoff, R., Friedrich, J., Geiges, R., Kahrau, M., Kamalov, S., Kirchbach, M., Kohl, M., Korn, M., Kramer, H., Krygier, K. W., Kunde, V., Kuss, M., Laget, J. M., Liesenfeld, A., Merle, K., ... Wolf, S. (1997). Pion electroproduction in the ³He(e,e′π⁺)³H reaction at intermediate energies. Nuclear Physics A, 626(4), 871-885. https://doi.org/10.1016/S0375-9474(97)00463-6

Blomqvist, KI, Boeglin, WU, Böhm, R, Distler, M, Edelhoff, R, Friedrich, J, Geiges, R, Kahrau, M, Kamalov, S, Kirchbach, M, Kohl, M, Korn, M, Kramer, H, Krygier, KW, Kunde, V, Kuss, M, Laget, JM, Liesenfeld, A, Merle, K, Neuhausen, R, Offermann, EAJM, Pospischil, T, Potokar, M, Rangacharyulu, C, Richter, A, Richter, AW, Rokavec, A, Rosner, G, Sauer, P, Schardt, S, Schrieder, G, Suda, T, Tiator, L, Vodenik, B, Wagner, A, Walcher, T & Wolf, S 1997, 'Pion electroproduction in the ³He(e,e′π⁺)³H reaction at intermediate energies', Nuclear Physics A, vol. 626, no. 4, pp. 871-885. https://doi.org/10.1016/S0375-9474(97)00463-6

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title = "Pion electroproduction in the 3He(e,e′π+)3H reaction at intermediate energies",

abstract = "The differential coincident pion electroproduction cross section in the 3He(e,e′π+)3H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies E0 = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q2 = 0.045 GeV2, with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Three-body Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included.",

keywords = "Coherent pion electroproduction, Delta resonance region, Longitudinal-transverse separation, Medium effects, he",

author = "Blomqvist, {K. I.} and Boeglin, {W. U.} and R. B{\"o}hm and M. Distler and R. Edelhoff and J. Friedrich and R. Geiges and M. Kahrau and S. Kamalov and M. Kirchbach and M. Kohl and M. Korn and H. Kramer and Krygier, {K. W.} and V. Kunde and M. Kuss and Laget, {J. M.} and A. Liesenfeld and K. Merle and R. Neuhausen and Offermann, {E. A.J.M.} and Th Pospischil and M. Potokar and C. Rangacharyulu and A. Richter and Richter, {A. W.} and A. Rokavec and G. Rosner and P. Sauer and St Schardt and G. Schrieder and T. Suda and L. Tiator and B. Vodenik and A. Wagner and Th Walcher and St Wolf",

note = "Funding Information: We are grateful to Philip Leconte from DAPNIA, CEA, for his help with the cryogenic target. This work has been supported by the Sonderforschungsbereich 201 of the Deutsche Forschungsgemeinschaft and by the BMBF under Contract Number 06DA665I. One of us (T.S.) acknowledges a grant from the Alexander-von-Humboldt Foundation.",

year = "1997",

month = dec,

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doi = "10.1016/S0375-9474(97)00463-6",

language = "English",

volume = "626",

pages = "871--885",

journal = "Nuclear Physics A",

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TY - JOUR

T1 - Pion electroproduction in the 3He(e,e′π+)3H reaction at intermediate energies

AU - Blomqvist, K. I.

AU - Boeglin, W. U.

AU - Böhm, R.

AU - Distler, M.

AU - Edelhoff, R.

AU - Friedrich, J.

AU - Geiges, R.

AU - Kahrau, M.

AU - Kamalov, S.

AU - Kirchbach, M.

AU - Kohl, M.

AU - Korn, M.

AU - Kramer, H.

AU - Krygier, K. W.

AU - Kunde, V.

AU - Kuss, M.

AU - Laget, J. M.

AU - Liesenfeld, A.

AU - Merle, K.

AU - Neuhausen, R.

AU - Offermann, E. A.J.M.

AU - Pospischil, Th

AU - Potokar, M.

AU - Rangacharyulu, C.

AU - Richter, A.

AU - Richter, A. W.

AU - Rokavec, A.

AU - Rosner, G.

AU - Sauer, P.

AU - Schardt, St

AU - Schrieder, G.

AU - Suda, T.

AU - Tiator, L.

AU - Vodenik, B.

AU - Wagner, A.

AU - Walcher, Th

AU - Wolf, St

N1 - Funding Information: We are grateful to Philip Leconte from DAPNIA, CEA, for his help with the cryogenic target. This work has been supported by the Sonderforschungsbereich 201 of the Deutsche Forschungsgemeinschaft and by the BMBF under Contract Number 06DA665I. One of us (T.S.) acknowledges a grant from the Alexander-von-Humboldt Foundation.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - The differential coincident pion electroproduction cross section in the 3He(e,e′π+)3H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies E0 = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q2 = 0.045 GeV2, with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Three-body Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included.

AB - The differential coincident pion electroproduction cross section in the 3He(e,e′π+)3H reaction has been measured with high resolution with the three-spectrometer set-up at the Mainz Microtron (MAMI) electron accelerator. Measurements were performed at the four incident energies E0 = 855, 675, 600, and 555 MeV at fixed four-momentum transfer Q2 = 0.045 GeV2, with the pions detected in parallel kinematics. This enables a separation of the measured cross section into the transverse and longitudinal structure functions by means of the Rosenbluth method. The experimental data are compared to model calculations, in which the elementary pion production amplitude includes the standard Born-amplitudes and also delta and higher resonance terms. Three-body Fadeev wave functions are used and the final state interaction of the outgoing pion is taken into account. The calculation describes the data only after medium modifications of the delta and of the pion are included.

KW - Coherent pion electroproduction

KW - Delta resonance region

KW - Longitudinal-transverse separation

KW - Medium effects

KW - he

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U2 - 10.1016/S0375-9474(97)00463-6

DO - 10.1016/S0375-9474(97)00463-6

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SN - 0375-9474

VL - 626

SP - 871

EP - 885

JO - Nuclear Physics A

JF - Nuclear Physics A

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