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References
incident π−:W. D. Walker, R. Hushfar andW. D. Shephard:Phys. Rev.,104, 526 (1956);E. Eisberg et al.:Phys. Rev.,97, 797 (1955);W. D. Walker andJ. Crussard:Phys. Rev.,98, 1416 (1955). The Fig. 20 in this paper contains one of the distributions which we shall discuss below. It is the only example we know.
incident p:T. W. Morris et al.:Phys. Rev.,103, 1472 (1956);W. B. Fowler et al.: Phys. Rev.,103, 1479 (1956);W. B. Fowler et al.: Phys. Rev.,103, 1489 (1956);M. M. Block et al.: Phys. Rev.,103, 1484 (1956).
J. Sellen, G. Cocconi, V. T. Cocconi andE. Hart:Phys. Rev.,110, 779 (1958).
For a discussion of the isobaric model compare:S. J. Lindenbaum andR. M. Sternheimer:Phys. Rev.,109, 1722 (1958) for the case of reaction (1) andPhys. Rev.,105, 1874 (1957) for the case of the reaction N+N→→N+N+π. Our point of view is however somewhat different from that expressed in the above mentioned papers; our question is simply to know whether considering only that subclass of events, which, kinematically could be compatible with the isobaric model, the relative angular momentum of the pion and nucleon from the « decay » of the isobaric state is 3/2 as it should be; of course it is to be hoped that the subclass of events in question is an appreciable fraction of the total number of the events; it is however difficult to say at present how appreciable it is and the experimental data do not furnish a clear picture.
CompareD. H. Wilkinson:Phys. Rev.,109, 1603, 1610, 1613 (1958) and the references quoted there.
G. Morpurgo:Nuovo Cimento,4, 1222 (1956);5, 1787 (1957); also the chap. 15 in:C. Franzinetti andG. Morpurgo:Suppl. Nuovo Cimento,6, 469 (1957).
R. K. Adair:Phys. Rev.,109, 1540 (1955).
We are well aware (G. Morpurgo andB. F. Touschek: circulated report, June 1957) of the fact that to a γ3 charge independent strong interaction between pions and nucleons it is not possible to add a parity non conserving term simultaneously maintaining the invariance under time reversal, which of course we want to preserve (electric dipole moments). However a strong parity non conserving process between pions and nucleons might be obtained for instance, without violating time reversal and charge independence, through the intermediary of strong parity non conserving interactions involving hyperons and heavy mesons.
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Morpurgo, G. A discussion of some angular distributions in the reactions π+N→π+π+N, N+N→2N+π, γ+N→π+π+N. Nuovo Cim 9, 564–567 (1958). https://doi.org/10.1007/BF02725116
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DOI: https://doi.org/10.1007/BF02725116