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Studies of Spin Excitations with Electromagnetic and Hadronic Probes

  • Richard A. Lindgren
  • Fred Petrovich

Abstract

Excitation of unnatural parity states, predominantly of high spin, using electromagnetic and hadronic probes, is discussed. Spectroscopic strengths are deduced from studies of (e,e’), (p,p’), (π,π’), and (p,n) for states whose “doorway” is the “stretched” particle-hole configuration. These levels are excited primarily through the isovector electromagnetic-nucleon magnetization coupling, nucleon-nucleon tensor coupling, and pion-nucleon spin-orbit coupling. The extracted isovector spectroscopic strength is typically 38% of the extreme single particle-hole model and about 66% of that predicted by more realistic nuclear structure calculations. The observed isoscalar strength is only about one half of the isovector strength. The results obtained with the three different probes are quite consistent. The primary conclusion is that the “missing strength” for these high spin excitations is at least as large as for the low spin Ml and GT excitations. This implies the existence of other important “quenching” mechanisms since the Δ-N-1 mechanism involved in the discussion of the low spin excitation affects only the isovector transitions and contributes little to high spin excitations. This implies the existence of other important “quenching” mechanisms since the Δ-N-1 mechanism involved in the discussion of the low spin excitation affects only the isovector transitions and contributes to high spin excitations. A method for using (e, e’) and π+- cross section ratios to separate and determine the absolute isoscalar and isovector spin densities for TO to TO transitions in N≠Z nuclei is also discussed and some comments on extracting information from (e,e’) and (p,p’) studies at high q on low spin 1+ and 2- levels are presented.

Keywords

High Spin High Spin State Spin Excitation Proton Angular Distribution Unnatural Parity State 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    T.W. Donnelly and G.E. Walker, Annals of Physics 60, 209 (1970).ADSCrossRefGoogle Scholar
  2. 2.
    P.J. Moffa and G.E. Walker, Nucl. Phys. A222, 140 (1974).ADSGoogle Scholar
  3. 3.
    R.A. Lindgren, W.J. Gerace, A.D. Bacher, W.G. Love, and F. Petrovich, Phys. Rev. Lett. 42, 1524 (1979).ADSCrossRefGoogle Scholar
  4. 3a.
    F. Petrovich and W.G. Love, Proc. LAMPF Workshop on Pion Single Charge Exchange, Los Alamos, New Mexico, (LA-7892C) 1979.Google Scholar
  5. 4.
    G.E. Brown, J. Speth, and J. Wambach, Phys. Rev. Lett. 46, 1057 (1981).ADSCrossRefGoogle Scholar
  6. 5.
    F. Petrovich and W.G. Love, Nucl. Phys. A354, 499c (1981).ADSGoogle Scholar
  7. 6.
    T. DeForest and J.D. Walecka, Ad. Phys. 15, 1 (1966).ADSCrossRefGoogle Scholar
  8. 7.
    F. Petrovich, R.H. Howell, C.H. Poppe, S.M. Austin, and G.M. Crawley, Nucl. Phys. A383, 355 (1982).ADSGoogle Scholar
  9. 8.
    W.G. Love and M.A. Franey, Phys. Rev. C24, 1073 (1981).ADSGoogle Scholar
  10. 9.
    F. Petrovich, J.A. Carr, D. Halderson, W.G. Love, and J.J. Kelly, to be published.Google Scholar
  11. 10.
    W.G. Love, M.A. Franey, and F. Petrovich, these proceedings.Google Scholar
  12. 11.
    J.A. Carr, Proceedings of the Second LAMPF II Workshop, Los Alamos, New Mexico (LA-9572C) 1982.Google Scholar
  13. 12.
    J.A. Carr, F. Petrovich, D. Halderson, D.B. Holtkamp, and W.B. Cottingame, Phys. Rev. C27, 1636 (1983).ADSGoogle Scholar
  14. 13.
    C. Wilkin, Nucl. Phys. A220, 621 (1974).ADSGoogle Scholar
  15. 14.
    E.R. Sicilano and G.E. Walker, Phys. Rev. C23, 2661 (1981).ADSGoogle Scholar
  16. 15.
    F. Lenz, these proceedings.Google Scholar
  17. 16.
    G.E. Walker, these proceedings.Google Scholar
  18. 17.
    T.W. Donnelly, J.D. Walecka, I. Sick, and E.B. Hughes, Phys. Rev. Lett. 21, 1196 (1968).ADSCrossRefGoogle Scholar
  19. 18.
    I. Sick, E.B. Hughes, T.W. Donnelly, J.D. Walecka, and G.E. Walker, Phys. Rev. Lett. 23, 1117 (1969).ADSCrossRefGoogle Scholar
  20. 19.
    T.W. Donnelly, J.D. Walecka, G.E. Walker and I. Sick, Phys. Lett. 328B, 545(1970).ADSGoogle Scholar
  21. 20.
    R.S. Hicks, J.B. Flanz, R.A. Lindgren, G.A. Peterson, L.W. Fagg, and J. Millener, to be published.Google Scholar
  22. 21.
    C. Hyde, W. Bertozzi, T. Buti, M. Deady, W. Hersman, J. Kelly, S. Kowalski, R. Lourie, B. Pugh, C.P. Sargent, W. Turchinetz, B. Norum, B.L. Berman, M.V. Hynes, J. Lichtenstadt, F. Petrovich, D. Halderson, J.A. Carr, and W.G. Love, Bull Am. Phys. Soc. 26, 27 (1981) and to be published.Google Scholar
  23. 22.
    S. Yen, R. Sobie, H. Zarek, B.O. Pich, T.E. Drake, C.F. Williamson, S. Kowalski, and C.P. Sargent, Phys. Lett. 43B, 250 (1980)ADSGoogle Scholar
  24. 22a.
    S. Yen, R. Sobie, H. Zarek, B.O. Pich, T.E. Drake, C.F. Williamson, S. Kowalski, and C.P. Sargent, Phys. Rev. C27, 1934 (1983).ADSGoogle Scholar
  25. 23.
    M.A. Plum, R.A. Lindgren, J. Dubach, R.S. Hicks, R.L. Huffman, B. Parker, G.A. Peterson, J. Alster, J. Lichtenstadt, and M.A. Moinster, to be published.Google Scholar
  26. 24.
    H. Zarek, B.O. Pich, T.E. Drake, D.J. Rowe, W. Bertozzi, C. Creswell, A. Hirsch, M.V. Hynes, S. Kowalski, B. Norum, F.N. Pad, C.P. Sargent, C.F. Williamson, and R.A. Lindgren, Phys. Rev. Lett, 38 750 (1977).ADSCrossRefGoogle Scholar
  27. 25.
    R. A. Lindgren, C.F. Williamson, and S. Kowalski, Phys. Rev. Lett. 40, 504 (1978).ADSCrossRefGoogle Scholar
  28. 26.
    R. A. Lindgren, J.R. Flanz, R.S. Hicks, B. Parker, G.A. Peterson, R.D. Lawson, W. Teeters, C.F. Williamson, S. Kowalski, X.K. Maruyama, Phys. Rev. Lett. 46, 706 (1981).ADSCrossRefGoogle Scholar
  29. 27.
    R.A. Lindgren, M.A. Plum, R.S. Hicks, B. Parker, G.A. Peterson, R. Singhal, C.F. Williamson, and X.K. Maruyama, Phys. Rev. Lett. 47, 1266 (1981).ADSCrossRefGoogle Scholar
  30. 28.
    J. Heisenberg, to be published.Google Scholar
  31. 29.
    J. Lichtenstadt, C.N. Papanicolas, C.P. Sargent, J. Heisenberg, and J.S. McCarthy, Phys. Rev. Lett. 44, 858 (1980).ADSCrossRefGoogle Scholar
  32. 30.
    J. Millener and D. Kurath, Nucl. Phys. A255, 315 (1975); D.J. Millener, private communication.ADSGoogle Scholar
  33. 31.
    E.R. Siciliano and D.L. Weiss, Phys. Lett. 93B, 371 (1980).ADSGoogle Scholar
  34. 32.
    D. Halderson, R.J. Philpott, J.A. Carr, and F. Petrovich, Phys. Rev. C24, 1095 (1981).ADSGoogle Scholar
  35. 33.
    HEIMAG, distorted wave code for magnetic states including high spin, obtained from J. Heisenberg. Modified by R.A. Lindgren to include HOWF.Google Scholar
  36. 34.
    D.J. Rowe, S.S.M. Wong and H. Chow, Nucl. Phys. A298, 21 (1978).ADSGoogle Scholar
  37. 35.
    A. Amusa and R.D. Lawson, Phys. Rev. Lett. 51, 103 (1983).ADSCrossRefGoogle Scholar
  38. 36.
    B.C. Metsch, Ph.D. thesis, Utrecht.Google Scholar
  39. 37.
    J. Dubach, Nucl. Phys. A340, 271 (1980).ADSGoogle Scholar
  40. 38.
    T. Suzuki, S. Krewald, and J. Speth, Phys. Rev. Lett. 107B, 9 (1981).ADSGoogle Scholar
  41. 39.
    I. Hammamoto, J. Lichtenstadt, and G.F. Bertsch, Phys. Lett. 96B, 249 (1980).ADSGoogle Scholar
  42. 40.
    F. Petrovich, unpublished.Google Scholar
  43. 41.
    S. Krewald and J. Speth, Phys. Rev. Lett. 45, 417 (1980).ADSCrossRefGoogle Scholar
  44. 42.
    G. Emery, these proceedings.Google Scholar
  45. 43.
    B.D. Anderson, these proceedings.Google Scholar
  46. 44.
    S. Joyce-Seestrom Morris, these proceedings.Google Scholar
  47. 45.
    J.R. Comfort, G.L. Moake, C.C. Foster, P. Schwandt, and W.G. Love, Phys. Rev. C26, 1800 (1982).ADSGoogle Scholar
  48. 46.
    G.S. Adams, A.D. Bacher, G.T. Emery, W.P. Jones, R.S. Kouzes, D.W. Miller, A. Picklesimer, and G.E. Walker, Phys. Rev. Lett. 38, 1387 (1977).ADSCrossRefGoogle Scholar
  49. 47.
    B. Anderson, A. Fazely, C. Lebo, J.W. Watson, and R. Madey, Phys. Rev. 25, 1715 (1982).Google Scholar
  50. 48.
    C. Olmer, B. Zeidman, D.F. Geesaman, T.S.H. Lee, R.E. Segal L.W. Swenson, R.L. Boudrie, G.S. Blanpied, H.A. Thiessen, C.L. Morris, and R.E. Anderson, Phys. Rev. Lett. 43, 612 (1979).ADSCrossRefGoogle Scholar
  51. 49.
    C. Olmer, private communication.Google Scholar
  52. 50.
    F. Petrovich, W.G. Love, A. Picklesimer, G.E. Walker, and E.R. Siciliano, Phys. Lett. 95B, 166 (1980).ADSGoogle Scholar
  53. 51.
    S. Yen, R.J. Sobie, T.E. Drake, A.D. Bacher, G.T. Emery, W.P. Jones, D.W. Miller, C. Olmer, P. Schwandt, W.G. Love, and F. Petrovich, Phys. Lett. 105B, 421 (1981).ADSGoogle Scholar
  54. 52.
    W.G. Love, A. Scott, F.T. Baker, W.P. Jones, and J.P. Wiggins, Jr., Phys. Lett. 73B, 277 (1978)ADSGoogle Scholar
  55. 52a.
    G. Bertsch, J. Borysowicz, H. McManus, and W.G. Love, Nucl. Phys. A284, 399 (1977).ADSGoogle Scholar
  56. 53.
    M. Gazzaly, M.A. Franey, and N. Hintz, private communication.Google Scholar
  57. 54.
    R.S. Henderson, B.M. Spicer, J.D. Svalbe, V.C. Officer, G.G. Shute, D.W. Divine, D.L. Friesel, W.P. Jones, and A.C. Attard, Aust. J. Phys. 32, 411 (1979).ADSGoogle Scholar
  58. 55.
    D.B. Holtkamp, W.J. Braithwaite, W. Cottingame, S.J. Greene, R.J. Joseph, C.F. Moore, C.L. Morris, J. Piffaretti, E.R. Sicilano, and H.A. Thiessen, Phys. Rev. Lett. 45, 420 (1980).ADSCrossRefGoogle Scholar
  59. 56.
    W.G. Love, private communication.Google Scholar
  60. 57.
    C.L. Morris, Workshop on Nuclear structure with Intermediate Energy Probes, Los Alamos, Ne Mexico (LA-8303C) 1980.Google Scholar
  61. 58.
    W. Bertozzi, Nucl. Phys. A374, 109c (1982).Google Scholar
  62. 59.
    C. Olmer, et al., to be published.Google Scholar
  63. 60.
    G.S. Adams, A.D. Bacher, G.T. Emery, W.P. Jones, D.W. Miller, W.G. Love, and F. Petrovich, Phys. Lett. 91B, 23 (1980).ADSGoogle Scholar
  64. 61.
    J.A. Carr and F. Petrovich, unpublished.Google Scholar
  65. 62.
    D.B. Holtkamp, S.J. Seestrom-Morris, S. Chakravarti, D. Dehnhard, H.W. Baer, C.L. Morris, S.J. Greene and C.J. Harvey, Phys. Rev. Lett. 47, 216 (1981).ADSCrossRefGoogle Scholar
  66. 63.
    D.B. Holtkamp, S.J. Seestrom-Morris, D. Dehnhard, H.W. Baer, C.L. Morris, S.J. Greene, C.J. Harvey, D. Kurath, and J.A. Carr, to be published.Google Scholar
  67. 64.
    D.F. Geesaman, et al., to be published.Google Scholar
  68. 65.
    C. Olmer, Conference Proceedings, McCormicks Creek State Park, 1982.Google Scholar
  69. 66.
    J.J. Kelly and J.A. Carr, these proceedings.Google Scholar
  70. 67.
    C.D. Goodman, C.A. Goulding, M.B. Greenfield, J. Rapaport, D.E. Bainum, C.C. Foster, W.G. Love, and F. Petrovich, Phys. Rev. Lett. 44, 1755 (1980).ADSCrossRefGoogle Scholar
  71. 68.
    C. Gaarde, these proceedings.Google Scholar
  72. 69.
    C.M. Crawley, these proceedings.Google Scholar
  73. 70.
    F. Petrovich, W.G. Love, and R.J. McCarthy, Phys. Rev. C21 1718 (1980).ADSGoogle Scholar
  74. 71.
    R.S. Hicks, these proceedings.Google Scholar
  75. 72.
    B.D. Anderson, R.J. McCarthy, M. Ahmad, A. Fazely, A.M. Kalenda, J. N. Knudson, J.W. Watson, R. Madey, and C.C. Foster, Phys. Rev. C26, 8 (1982).ADSGoogle Scholar
  76. 73.
    S. Cohen and D. Kurath, Nucl. Phys. 73, 1 (1965)CrossRefGoogle Scholar
  77. 73a.
    S. Cohen and D. Kurath, Nucl. Phys. A101, 1 (1967).ADSGoogle Scholar
  78. 74.
    P.A.M. Guichon and C. Samour, Nucl. Phys. A382, 461 (1982).ADSGoogle Scholar
  79. 75.
    J.R. Comfort, G.L. Moake, C.C. Foster, P. Schwandt, C.D. Goodman, J. Rapaport and W.G. Love, Phys. Rev. C24, 1834 (1981).ADSGoogle Scholar
  80. 76.
    J.B. Flanz, R.S. Hicks, R.A. Lindgren, G.A. Peterson, A. Hotta, B. Parker, and R.C York, Phys. Rev. Lett. 41, 1642 (1978).ADSCrossRefGoogle Scholar
  81. 77.
    J.B. Flanz, R.S. Hicks, R.A. Lindgren, G.A. Peterson, J. Dubach, and W.C Haxton, Phys. Rev. Lett. 43, 1922 (1979).ADSCrossRefGoogle Scholar
  82. 78.
    J.B. Flanz, Ph.D. thesis, University of Massachusetts (University Microfilms, Ann Arbor, 1979).Google Scholar

Copyright information

© Plenum Press, New York 1984

Authors and Affiliations

  • Richard A. Lindgren
    • 1
  • Fred Petrovich
    • 2
  1. 1.Department of Physics and AstronomyUniversity of MassachusettsAmherstUSA
  2. 2.Department of PhysicsFlorida State UniversityTallahasseeUSA

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