Summary
A total of 3 480 K−-mesons has been observed. Of these 445 interact in flight, at a mean energy of 40 MeV and only their general characteristics have been studied. Little difference has been observed between the number of unstable charged particles (Σ±-hypersons and π±-mesons) in these interactions and those in the 3 035 interactions at rest. The 3 035 K−-interactions at rest have been studied in detail. In this paper (Part I) are given the results on those interactions in which π-mesons are emitted. An estimate of the Σ-hyperon nuclear potential is based on the energy spectrum of π-mesons emitted in the K−-interactions in which the only charged particles emitted are a π-meson and a Σ-hyperon. A detailed examination of the angular distribution of 2-pronged events, and of the sign ratio of the π-mesons, the prong distribution and energy release in all events has led to an estimate of the probabilities of absorption of positive and negative Σ-hyperons in the parent nucleus, and to a partition of the events between the various primary reactions.
Riassunto
È stato esaminato un totale di 3 480 mesoni K−. Di essi 3 035 interagiscono a riposo, 445 interagiscono in volo con un’energia media di 40 MeV. Delle interazioni in volo sono state studiate solo le caratteristiche generali. Si osserva poca differenza nel numero di particelle instabili (iperoni Σ e mesoni π) emesse nelle interazioni in volo e nelle interazioni a riposo. Le 3 035 interazioni a riposo sono state studiate particolareggiatamente. In questo lavoro (Parte I) sono presentati i risultati relativi alle interazioni nelle quali sono emessi mesoni π carichi. Dallo spettro di energia dei mesoni π emessi nelle interazioni in cui le sole particelle cariche emesse sono un mesone π e un iperone Σ è stata ricavata una stima del potenziale nucleare degli iperoni Σ. Un’analisi particolareggiata della distribuzione angolare delle stelle a due rami, del rapporto dei segni dei mesoni π, della distribuzione del numero di rami delle stelle e dell’energia totale visibile ha condotto a una stima della probabilità di assorbimento degli iperoni Σ positivi e negativi nel nucleo di origine, e a una ripartizione degli eventi tra le varie reazioni primarie.
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References
K. H. Barker:Proceedings of the Duke Conference (1953), p. 11–18;D. Lal, Y. Pal andB. Peters:Proc. Ind. Acad, Sci.,38, 398 (1953);Report of the Committee on K-particles, Padua-Conference, inSuppl. Nuovo Cimento.12, 433 (1954).
A. Pais:Phys. Rev.,86, 663 (1952).
M. Gell-mann:Phys. Rev.,92, 833 (1953);M. Gell-mann andA. Pais:Proc. Glasgow Conference (1954).
K. Nishijima:Proc. Theor. Phys.,10, 581 (1953);12, 107 (1954).
R. Armenteros, B. Gregory, A. Lagarrigue, L. Leprince-Ringuet, F. Muller andCh. Peyrou:Suppl. Nuovo Cimento,12, 324 (1954).
M. Di Corato, B. Locatelli, G. Mignone andG. Tomasini:Suppl. Nuovo Cimento,12, 270 (1954);M. F. Friedlander, Y. Fujimoto, D. Keefe andM. G. K. Menon:Nuovo Cimento,2, 90 (1955).
W. Chupp, G. Goldhaber, S. Goldhaber andF. H. Webb:Phys. Rev.,100, 959 (1955);W. F. Fry, J. Schnepps, G. A. Snow andM. S. Swami:Phys. Rev.,100, 950 (1955);E. P. George, A. J. Herz, J. H. Noon andN. Solnsteff:Nuovo Cimento,3, 94 (1956);J. Hornbostel andE. O. Salant:Phys. Rev.,102, 502 (1956);D. M. Fournet andM. Widgoff:Phys. Rev.,102, 929 (1956);D. M. Haskin, T. Bowen andM. Schein:Phys. Rev.,103, 1512 (1956).
L. W. Alvarez:Berkeley Bubble Chamber, (1956),CERN Symposium.
S. Goldhaber:Report at Rochester Conference (1956).
F. C. Gilbert, C. E. Violet andR. S. White:Phys. Rev.,103, 1825 (1956).
L. W. Alvarez, H. Bradner, P. Falk-Vairant, J. D. Gow, A. H. Rosenfeld, F. T. Solmitz andR. D. Tripp:Nuovo Cimento,5, 1026 (1957).
F. C. Gilbert, C. E. Violet andR. S. White:Phys. Rev.,107, 228 (1957).
W. Barkas:Report at 7-th Rochester Conference (1957).
G. Occhialini:Premier Colloque de Photographie Corpusculaire, Strasbourg (1957).B. Bhowmik, J. H. Davis, D. Evans andD. J. Prowse:Nuovo Cimento,7, 712 (1958).
W. Barkas, P. H. Barret, P. Cüer, H. H. Heckman, F. M. Smith andH. K. Ticho:Phys. Rev.,102, 583 (1956).
G. Alexander andR. H. W. Johnston:Nuovo Cimento,5, 363 (1957).
Note added in proof. — That this is so has been shown in a successive study of K−-stars in a more favourable stack (M. C. Amerighi, F. Baldassare, M. Beniston, A. Bonetti, D. H. Davis, M. Di Corato, C. Dilworth, E. Ferreira, E. Frota-Pessoa, W. B. Lasich, N. Raina, M. René, J. Sacton andA. C. Sichirollo:Nuovo Cimento,12, 91 (1959).)
Y. Eisenberg, W. Koch, E. Lohrmann, M. Nikolic, M. Schneeberger andH. Winzeler:Nuovo Cimento,9, 745 (1958).
M. Ceccarelli:Report at the 7-th Rochester Conference (1957).
W. Alles, N. N. Biswas, M. Ceccarelli andJ. Crussard:Nuovo Cimento,6, 571 (1957).
See contribution to Kaplon Report:Geneva Conference (1958).
C. Dilworth:Report at 7-th Rochester Conference (1957). Also contribution to Kaplon Report:Geneva Conference (1958).
R. H. Capps:Phys. Rev.,107, 239 (1957).
We are indebted to Dr.Dell’Antonio, Dr.Parolini and Mr.Underhill for calculating these distributions.
Y. Eisenberg, W. Koch, M. Nikolić, M. Schneeberger andH. Winzeler:Nuovo Cimento,11, 351 (1959).
M. Baldo-Ceolin, C. Dilworth, W. F. Fry, W. D. B. Greening, H. Huzita, S. Limentani andA. E. Sichirollo:Nuovo Cimento,7, 328 (1958).
F. C. Gilbert andR. S. White:Phys. Rev.,107, 1770 (1957).
See note in proof, Sect. 3.5.
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Bhowmik, B., Evans, D., Falla, D. et al. The interaction and decay of K− mesons in photographic emulsion. Nuovo Cim 13, 690–729 (1959). https://doi.org/10.1007/BF02726361
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DOI: https://doi.org/10.1007/BF02726361