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Il Nuovo Cimento (1955-1965)

, Volume 21, Issue 4, pp 581–592 | Cite as

Isotopic spin dependence of nucleon-nucleon gross-sections between 600 and 1000 MeV

  • G. Martelli
  • H. B. van der Raay
  • R. Rubinstein
  • K. R. Chapman
  • J. D. Dowell
  • W. R. Frisken
  • B. Musgrave
  • D. H. Reading
Article

Summary

The ratio of the differential cross-seel ion for p-p and p-n scattering at 90° in the c.m.s. has been measured at three different energies, between 600 MeV and 1000 MeV, using fast scintillation counters in conjunction with magnetic momentum analysis. The value of this ratio decreases markedly with increasing energy, from 3.04 ± .056 at 595 MeV, to 1.00 ± 0.18 at 775 MeV and to 0.683 ± 0.097 at 1.010 MeV, showing an enhancement of the scattering amplitude in theT = 0 state above 600 MeV. It is shown how this behaviour may be related to the second resonance in π-p scattering.

Riassunto

Si è misurato il rapporto fra le sezioni d’urto differenziali per scattering p-p e p-n a 90° nel centro di massa a tre differenti energie, fra 600 MeV e 1000 MeV, mediante l’uso di contatori a scintillazione e analisi magnetica. Il valore di questo rapporto diminuisce notevolmente col crescere dell’energia, da 3.04 ± 0.56 a 595 MeV, a 1.00 ± 0.18 a 775 MeV e a 0.683 ± 0.097 a 1000 MeV, e questo indica un aumento della ampiezza di scattering nello statoT = 0 al di sopra di 600 MeV. Questo risultato è posto in relazione con la seconda risonanza nello scattering π-p.

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Copyright information

© Società Italiana di Fisica 1961

Authors and Affiliations

  • G. Martelli
    • 1
  • H. B. van der Raay
    • 1
  • R. Rubinstein
    • 1
  • K. R. Chapman
    • 1
  • J. D. Dowell
    • 1
  • W. R. Frisken
    • 1
  • B. Musgrave
    • 1
  • D. H. Reading
    • 1
  1. 1.Physics DepartmentThe University of BirminghamBirmingham

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