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Prog. Theor. Phys. Vol. 27 No. 2 (1962) pp. 404-421

[ Full Text PDF : FREE ACCESS (1263K) ]

The Spin-Flip Scattering of High Energy Protons by Light Nuclei

Mitsuji Kawai, Tokuo Terasawa*, and Kouichi Izumo**

Department of Physics, Tokyo Institute of Technology, Tokyo
*Department of Physics, Tokyo University of Education, Tokyo
**Institute of Physical and Chemical Research, Tokyo

(Received October 11, 1961)

Abstract:

The spin-flip inelastic scattering of high energy protons is investigated for the 15.1 Mev excitation of C12 and the 9.2 Mev excitation of N14. The electromagnetic interaction is found to be far too weak to account for the observed cross sections. The spin-flip cross sections due to the (σ1 ·σ2)(τ1 ·τ2) part of the nuclear interaction are calculated by means of the impulse approximation. In the case of C12 the cross section can be calculated without referring to any special nuclear model from the ft-value of the β-decay of B12 or N12 to the ground state of C12. The result agrees very well with the experimental cross section showing the validity of the assumptions involved in the calculation. It is also shown that the spin-flip scattering is the only process which shows the angular distribution with maximum at 0° leaving the residual nucleus in a discrete low-lying excited state. The nuclear matrix element of the transition estimated conversely from the observed cross section may be used as a datum for the relevant nuclear states. In particular the separate contributions of the spin and the orbital angular momenta to the M1 γ-transition between the relevant states can be estimated and are found to be of the ratio 1 to 0.3 both for C12 and N14. Discussions are given on the approximations used in the calculations as well as on the nuclear states relevant to the excitations.


URL : http://ptp.ipap.jp/link?PTP/27/404/
DOI : 10.1143/PTP.27.404

[ Full Text PDF : FREE ACCESS (1263K) ] Citation:

References:

  1. H. Tyrén and Th. A. Maris, Nucl. Phys. 3 (1957), 52[CrossRef]; ibid. 4 (1957), 277[CrossRef]; ibid. 4 (1957), 637[CrossRef]; ibid. 6 (1958), 446[CrossRef]; ibid. 7 (1958), 24[CrossRef]; ibid. 7 (1958), 281[CrossRef].
  2. Garron, Jacmart, Massonnet, Riou and Ruhla, J. Phys. et Rad. 21 (1960), 317.
  3. H. Tyrén and Th. A. Maris, Nucl. Phys. 3 (1957), 35[CrossRef]; ibid. 4 (1957), 662[CrossRef].
  4. M. Kawai and T. Terasawa, Prog. Theor. Phys. 22 (1959), 513[PTP].
  5. Y. Sakamoto, Prog. Theor. Phys. 24 (1960), 81[PTP].
  6. A. K. Kerman, H. McManus and R. M. Thaler, Ann. of Phys. 8 (1959), 551[CrossRef].
  7. R. H. Dalitz and D. R. Yennie, Phys. Rev. 105 (1957), 1598[APS].
  8. E. L. Garwin, Phys. Rev. 114 (1959), 143[APS].
  9. D. Kurath, private communication.
  10. L. Wolfenstein, Annual Review of Nuclear Science, Vol. 6, Stanford, 1956.
  11. R. Hofstadter, Rev. Mod. Phys. 28 (1956), 214[APS].
    D. C. Ravenhall, Rev. Mod. Phys. 30 (1958), 430[APS].
  12. H. J. Rose, Nucl. Phys. 19 (1960), 113[CrossRef].
    Rose, Trost and Riess, Nucl. Phys. 12 (1959), 510[CrossRef].
  13. F. Ajzenberg-Selove and T. Lauritsen, Nucl. Phys. 11 (1959), 1[CrossRef].
  14. Y. Sakamoto, Nucl. Phys. 25 (1961), 687[CrossRef].
  15. S. S. Hanna and L. Meyer-Schützmeister, Phys. Rev. 115 (1959), 986[APS].
  16. J. M. Blatt and V. F. Weisskopf, Theoretical Nuclear Physics (John Wiley and Sons, New York, 1952).
  17. D. Kurath, Phys. Rev. 101 (1956), 216[APS]; ibid. 106 (1957), 975[APS].
  18. G. Flammand and K. W. Ford, Phys. Rev. 116 (1959), 1591[APS].
  19. J. P. Elliott, Phil. Mag. Ser. VIII, 1 (1956), 503.
    B. Jancovici and I. Talmi, Phys. Rev. 95 (1954), 289[APS].
    W. M. Visscher and R. A. Ferrell, Phys. Rev. 99 (1955), 649[APS].
    K. Ott, Z. Naturforsch. A 14 (1959), 769.
  20. E. K. Warburton and W. T. Pinkston, Phys. Rev. 118 (1960), 733[APS].

Citing Article(s) :

  1. Progress of Theoretical Physics Vol. 28 No. 3 (1962) pp. 564-566 :
    Inelastic Scattering of High Energy Nucleons by Nuclei and Impulse Approximation
    Yoshihiko Nishida
  2. Progress of Theoretical Physics Vol. 43 No. 5 (1970) pp. 1231-1243 :
    Analysis of the 58Ni(n, p)58Co Reactions Leading to Parent Analogues of Collective States
    Mitsuaki Obu and Tokuo Terasawa
  3. Progress of Theoretical Physics Vol. 48 No. 5 (1972) pp. 1563-1568 :
    Spin-Flip Scattering of Pions by Nuclei
    Yasuhiko Futami and Toshitake Kohmura

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