Summary
An analysis of the existing experimental data on the elastic scattering of photons by deuterons, is carried out in the framework of the impulse approximation. Nevertheless, it also attempts to take into account certain effects which are not given by the impulse approximation. Including these effects, we have been able to improve the prediction of the theory on the deuteron Compton effect. Based on this analysis we make an estimation of the neutron electric polarizability. We found it ∼1.2·10−42 cm3. In addition we discuss experiments in proton, deuteron and4He Compton effect with polarized γ’s, for a better specification of the polarizabilities of the proton and neutron as well.
Riassunto
Si esegue una analisi dei dati sperimentali esistenti sulla diffusione elastica di fotoni su deutoni nell’ambito dell’approssimazione dell’impulso. Nondimeno, si tenta di tener conto di taluni effetti che non sono presi in considerazione nell’approssimazione dell’impulso. Includendo questi effetti si riesce a migliorare le predizioni della teoria sull’effetto Compton su deuterio. Basandosi su questa analisi si dà una stima della polarizzabilità elettrica del neutrone. Si è ottenuto un valore di ∼1.2·10−42 cm3. In aggiunta si discutono esperimenti di effetto Compton su protone, deuterio ed4He con γ polarizzati, per una migliore determinazione della polarizzabilità tanto del protone che del neutrone.
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Literatur
S. D. Drell andF. Zachariasen:Electromagnetic Structure of Nucleons (New York, 1961).
V. S. Barashenkov andH. J. Kaiser:Fortschritte der Physik,10, 33 (1962);V. S. Barashenkov:Proceedings of the International Conference on Nucleon Structure at Stanford University (1963), edited byR. Hofstadter andL. I. Schiff (Stanford, Calif.).
A. M. Baldin:Nucl. Phys.,18, 310 (1960).
V. I. Gol’danskii, O. A. Karpukhin, A. V. Kutsenko andV. V. Pavlovskaya:Żurn. Ěksp. Teor. Fiz.,38, 1695 (1960);Soviet Phys. JETP,11, 1223 (1960).
R. M. Thaler:Phys. Rev.,114, 827 (1959).
G. Breit andM. L. Rustgi:Phys. Rev.,114, 830 (1959).
L. I. Lapidus:Żurn. Ěksp. Teor. Fiz.,43, 1358 (1962);Soviet Phys. JETP,16, 964 (1963).
V. K. Fedyanin:Żurn. Ěksp. Teor. Fiz.,42, 1038 (1962);Soviet Phys. JETP,15, 720 (1962).
J. L. Powell:Phys. Rev.,75, 32 (1949).
L. G. Hyman, E. Ely, D. H. Frisch andM. A. Wahlig:Phys. Rev. Lett.,3, 93 (1959).
See ref. (2) of ref. (13).
A. Langsdorf, R. O. Lane andJ. E. Monahan:Phys. Rev.,107, 1077 (1957).
R. S. Jones, H. J. Gerber, A. O. Hanson andA. Wattenberg:Phys. Rev. 128, 1357 (1962).
J. Fox, L. Criegee, H. J. Gerber, A. O. Hanson andR. S. Jones:Bull. Am. Phys. Soc.,9, 69 (1964).
R. H. Capps:Phys. Rev.,106, 1030 (1957);108, 1032 (1957). Several references on the impulse approximation are given in these papers.
L. I. Lapidus andChou Kuang-chao:Żurn. Ěksp. Teor. Fiz.,37, 1714 (1959);Soviet Phys. JETP,10, 1213 (1960).
J. A. McIntyre andG. R. Burleson:Phys. Rev.,112, 2077 (1958).
For a complete list of references seeD. Holliday:Ann. Phys.,24, 319 (1963).
A. P. Contogouris andA. Verganelakis:Phys. Lett.,6, 103 (1963).
J. Mathews:Ph. D. thesis, California Institute of Technology (1957) (unpublished).
A. C. Hearn andE. Leader:Phys. Rev.,126, 789 (1962).
A. P. Contogouris:Nuovo Cimento,25, 104 (1962).
L. I. Lapidus andChou Kuang-chao:Żurn. Ěksp. Teor. Fiz.,41, 491 (1961);Soviet Phys. JETP,14, 352 (1962).
M. Jacob andJ. Mathews:Phys. Rev.,117, 854 (1960).
In the unitary-symmetry scheme, this coupling is critical to the ratioD/F as we may see from the formula (25)
R. F. Dashen:Nuovo Cimento,32, 469 (1964).
In ref. (19) an experiment was proposed that is now in progress at Frascati (26), and which may assist us to understand the above uncertainties.
G. Barbiellini, G. Bologna, G. Diambrini andG. P. Murtas: (private communication).
G. Bernardini: 9th International Annual Conference on High-Energy Physics (Kiev, 1959), p. 36.
R. L. Schult andR. H. Capps:Phys. Rev.,119, 377 (1960).
L. I. Lapidus andChou Kuang-chao:Żurn. Ěksp. Teor. Fiz.,39, 1286 (1960);Soviet Phys. JETP,12, 898 (1961).
D. B. Fossan andM. Walt:Phys. Rev. Lett.,12, 672 (1964).
It is interesting to notice that with the help of polarized γ’s obtained by using crystals (31), we also simplify the experimental procedure in the case of Compton scattering. This is because the bremsstrahlung spectrum in crystals gives a peak at a certain energy value, which we may exploit; consequently we arrange our apparatus in such a way that, although we remain with a reasonable count rate, we may reduce considerably (sometimes ∼100 times) the contamination of our data from the γ’s coming from the π0 which are photoproduced at the same time (32).
G. Barbiellini, G. Bologna, G. Diambrini andG. P. Murtas:Phys. Rev. Lett.,9, 396 (1962);N. Cabibbo, G. Da Prato, G. De Franceschi andU. Mosco:Phys. Rev. Lett.,9, 270 (1962).
A. Verganelakis:Progetto di una esperienza per lo studio dell’effetto Compton su protoni con γ polarizzati intorno alla seconda risonanza (unpublished).
B. De Tollis andA. Verganelakis:Effetti dell’interazione pione-pione sulla fotoproduzione coerente di π0 su deuterio. Nota interna n. 23, University of Rome (unpublished).
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Submitted by one of us (A.T.) in partial fulfilment of the degree ofLaurea in Fisica at the University of Rome, July 1964.
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Tenore, A., Verganelakis, A. Elastic photon-deuteron scattering and the nucleon polarizability. Nuovo Cim 35, 261–278 (1965). https://doi.org/10.1007/BF02734837
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DOI: https://doi.org/10.1007/BF02734837