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DELTA-NUCLEUS DYNAMICS May 2-3, 1983 at Argonne National Laboratory

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DELTA-NUCLEUS DYNAMICS May 2-3, 1983 at Argonne National Laboratory Distribution Category: Physics—lh»cl«*r (UC-34C) AHL-PHY-83-1 M84003655 C0MF-830S88 MJL-PHY—-83-1 DB84 003655 PROCEEDINGS OF THE SYMPOSIUM ON DELTA-NUCLEUS DYNAMICS May 2-3, 1983 at Argonne National Laboratory Edited by T.-S. H. Lee D. F. Geesaman J. P. Schiffer Organizing Committee Scientific Advisory Conaittee D. F. Geesaman 6. E. Brown (SUNY) T.-S. H. Lee C. H. Q. Ingram (SIN) J. P. Schiffer E. J. Moniz (MIT) E. Vogt (TRIDMF) J. D. Walecka (Stanford) Jointly sponsored by Physics Division, Argonne National Laboratory and The University of Chicago October 1983 mm EOTICE PORTIONS OF THIS REPORT ARC JLLEHll^. A limited nwiber of oopiea of this report ore available for general It he* been reprocmcei from tho distribution. For Ji&ther copies, evaflaMt copy to permit Dm contact T.-S. H. Lee, Physics Div.t Argonne National laboratory, Argonnej Illinois, 60439. f: OF THIS DOCUMENT IS f i ii Introduction The appreciation of the role in nuclear physics of the first excited state of the nucleon, the delta A(1232), has grown rapidly in the past decade. The delta resonance dominates nuclear reaction* induced by intermediate energy pious, nucleons, and electromagnetic probes. It is also the most important non-nucleonic degree of freedom needed to resolve many fundamental problems encountered in the study of iov-enurgy nuclear phenomena. Clearly, a new phase of nuclear physics has emerged and conventional thinking must be extended to account for this new dimension of nuclear dynamics. The most challenging problem we are facing is how a unified theory can be developed to describe A-nucleus dynamics at all energies. In exploring this new direction, it is important to have direct discussions among researchers with different viewpoints. The purpose of this symposium was to draw together physicists in diverse areas of photon-nucleus, pion-nucleus, and proton-nucleus interactions, and nuclear structure studies. The format of the meeting was designed to allow the 142 participants to engage in vigorous and stimulating discussion following each of the invited talks. The outcome was a significant cross fertilization of ideas from all avenues of research. The success of the symposium was a direct result of the enthusiasm and cooperation of the participants. The organizers would like to thank each of them for their contributions. We would also like to thank Miriam Holden and her staff of the Argonne Conference Service for their excellent arrangements for the meeting, and Nancy Williams for her assistance with preparing the contributed papers for the publication as an Argonne Report. Finally, we wish to acknowledge the University of Chicago anci the Argorrae Physics Division for their financial support to the Symposium, and to thank G. E. Brown, C. H. Q. Ingram, E. J. Moniz, E. Vogt, and J« D» Walecka for their advice and help in organizing the program. D. F. Geesaaan T.-S. H. Lee J,, P. Schiffer TABLE OF CONTENTS Invited Paper* Morning Session - Monday, May 2 - D« E. Nagle, Chairan The (y ,*) and (Y,p) reactions in the resonance region J. Arends (Bonn) . 1 Experimental studios of the AN interaction D. Ashery (Tel Aviv) 23 A excitation in nuclei by hadronic and electromagnetic probes E. J. Moniz (MIT) (Manuscript is not available) Afternoon Sea9Ion - Monday, May 2 - H. McManus, Chairman Experimental features of inclusive (*,*') and (w,ir'p) reactions C. H. Q. Ingram (SIN) 55 High resolution studies of pion-nucleus reaction mechanisms C. L. Morris (LANL) 101 Isobar-hole approach to pion-nucleus inelastic scattering M. Thies (Urije University) 115 The A resonance in pion elastic, single and double charge exchange scattering M. Johnson (LANL). 153 Morning Session - Tuesday, May 3 - J. L. Matthews, Chairman The NN, NA, and AA interactions G. E. Brown (SUNY) . 161 Meson-exchange Hamiltonian for NN scattering up to 2 Gev and isobar-nucleus dynamics T.-S. H. Lee (ANL) 199 Proton excitation of the A region C. Glashausser (Rutgers) ..... 219 Afternoon Session - Tuesday, May 3 - E. Lomon, Chairman Photonuclear reactions in the A-hole model J. Koch (NIKHEF) 267 Pion absorption in the A-hole model K. Yozaki (Tokyo) 297 Double A excitation in picn x^sorption A. Wirzba (SUNY) 317 Morning Session - Wednesday, Nay 4 - F. Tabakln, Chairman Pion photo- and electroproduction on light nuclei J. M. Laget (Saclay) 329 Faddcev calculations of three nucleon bound states including the A P. Sauer (Hanover) 355 Three nucleon interaction and nuclear composition V. R. Pandharipande (Illinois) 379 Afternoon Session - Wednesday, Hay 4 - D. Kurath, Chairman A's in nuclei studied with the (3He,t) reaction C. Caarde (Niels Bohr Institute) 395 The effects of the A on nuclear, electromagnetic and weak transitions A. Arima (Tokyo) 419 Contributed Papers o Pion Absorption in He G. Backenstoss, et al «... 455 Multiple A(1236) - Rescattering In Nuclear Pion Absorption M. Dillig, V. E. Herscovitz and M» R. Teodoro 463 Contributions of Double-A and Other Two-Nucleon Mechanisms to Pionic Pion Production on the Deutron L.-C. Liu, R. S. Bhalerao and E. Piasetzky . „ 465 Isospin Dependence of Pion Absorption by Nucleon Pairs H. Toki find H. Sarafian 473 Isobar-Doorway Model of the 160(*+,pp)14N Reaction ; W. R. Wharton and B. D. Keister 475 Pion-Induced Non-Analog Double Charge Excharge L. C. Bland, et al 483 Effects of Effective Delta-Nucleon and Particle-hole Interactions on the 13C(*+,ir0)13N Charge Exchange Scattering M. HIrata and K. Sakamoto 491 Effect of Effective Delta-Nucleon Interaction on the Ratio of the Isoscalar and Isovector Excitation Cross Section in the C(ir ,w') Reaction M. Hirata and K. Sakamoto 497 Measurement of 16O(ir*,**p)15N Near the 3-3 Resonance G. S. Kyle, et al 505 Theory of Coulomb Interactions in the Intermediate States of Pion-Mucleus Scattering R. Seki. 519 Experimental Features of Inclusive Pion Double Charge Exchange on Oxygen and Calcium S. A. Wood, et al , 521 1 9 A Study of Neutral Pion Photoproduction of C G. H. Epstein 529 Effect of Quark-Quark Tensor Force on the Radiative Decay of A-Isobar to Nucleon J. Dey and M. Dey * 531 Comparison of Inclusive (Y,p) and (ir,p) Reactions in the A(1232) Resonance Region J. L. Matthews, R. A. Schumacher and R. P. Redwine 539 Pion Radiative Capture and Charge Exchange in the A Resonance D. F. Measday, etal 547 Does the A(1232) Play an Important Role in Y+3He+p+d? B. M. Nefkens 557 Propagator Nonlocalities in Nuclear Photopion Reactions G. Toker and F. Tabakin 565 Effective pp+nA++ Coupling Potential B. K. Jain 566 Quasi-Free A Isobar Production in the 13C(p,d)*2C* Reaction H. Toki 567 Study of Low Lying A(1236) -N States in 12C M. Dillig, V. E. Heracovitz and M. R. Teodoro 568 An Explicit Model for the Two- and Three-Pion Exchange Contribution to the NN Interaction K. Holinde and R. Machleidt 569 AN-Dibaryon Resonances in the D -Model H. G. Hopf, M. Dillig and M. G. Huber 577 Restrictions an Quark Dynamics from Present and Future Hadron-Hadron Scattering E. L. Lomon. 578 Deutron Properties of the Coupled NN, AA and NN System E. L. Lomon 579 Possible Quark Manifestation in wd+nd Observables A. S. Rinat 581 vi Realistic Nucleon-Nucleon Potentials with and Without A(1232) Degrees of Freedom R. B. Wiringa, R. A. Smith and T. Ainsworth 584 Corrections to Ml and Gamow-Teller Operators Deduced from an Analysis of Magnetic Moments and Beta Decays of sd-Shell Nuclei B. A. Brown and B. H. Wildenthal 585 Ml Transitions and Magnetic Moments in the Pb-Region and the Role of the A F. C. Khanna, I. S. Towner and 0. H'iusser, 587 Density Dependence and Tensor Part of the A-Self Energy in a Nuclear Medium E. Oset and L. L. Salcedo 595 Microscopic Background Calculations for Gamow-Teller Resonances F. Osterfeld 605 Microscopic Deviation of the Spin-Isospin Landau Parameter g' for Nucleons and A-Isobars H. Toki 606 Nuclear Matter with Semiphenomenological Meson Exchange Interaction S. A. Moszkowski 60? List of Participants 609 (K-fP)- and (»,f)-Reactions in the Resonance Region J. Arends Physikalisches Institut, Oniversitat Bonn Introduction The main subject of medium energy nuclear physics is to investigate the influence of the nucleon isobars on the properties of nuclear states and nuclear reactions. Energy and momentum can be transferred to the nucleus by different probes. Real and virtual photons, pions and nucleons are the most important ones. Pions offer the advantage of a large cross section for the ?N-A transition, a simple spin structure and a selective excitation of different isospin states. However, the interpretation of the results is complicated because of the strong pion interaction. Photons are considered to be a clean probe due to their large mean free path in nuclear matter and the well known interaction described by QED. Also, one of the basic ingredients of photonuclear physics, the elementary j.N-»S"N process, has been studied extensively for many years. There have been excellent reviews of the status of photonuclear physics at recent conferences (1-8). In this talk, only a few selected topics can be discussed: total hadronic cross sections, the emission of protons and the production of charged and neutral pions. Photoreactions on light nuclei will be covered by different contributions to this conference. Photon beams Although in principle the photon is an ideal probe for the investigation of nuclei, photonuclear experiments are In practice hampered by the lack of high quality monochromatic photon beams. The highest: photon beam intensities are presently reached by bremsstrahlung of electrons.
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