Summary
A search has been made for a neutral meson of zero I-spin by means of the reaction d+d→4He+π 00 . No evidence was found for the existence of the π 00 in the mass range zero to 1.8 times the π± mass. The upper limit of the cross section was 7·10−32 cm2 for π 00 ⋍π± mass. The reaction was studied by using 460 MeV deuterons from the Berkeley 184 in. cyclotron and a liquid deuterium target.α-particles produced at 0° in the laboratory system were selected by momentum analysis and by a counter telescope which measured time of flight, dE/dx, and differential range. The experiment may also set a limit on the validity of charge independence.
Riassunto
Si è ricercato il mesone di spin isotopico zero per mezzo della reazione d+d→4He+π 00 . Non si è trovata alcuna prova dell’esistenza del π 00 per una massa compresa nell’intervallo fra zero ed 1.8 volte la massa del π±. Il limite superiore della sezione d’urto era 7·10−32 cm2 per la massa del π 00 ≪π±. La reazione fu studiata servendosi di deutoni di 460 MeV del ciclotrone da 184 in. di Berkeley e di una targhetta di deuterio liquido. Le particelleα emesse a 0° nel sistema del laboratorio furono selezionate con l’analisi degli impulsi e con un contatore telescopico che misurava la durata di volo, dE/dx ed il range differenziale. L’esperimento può anche stabilire un limite alla validità della indipendenza della carica.
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Work done under the auspices of the U. S. Atomic Energy Commission.
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Booth, N.E., Chamberlain, O. & Rogers, E.H. Search for a neutral meson of zero I-spin. Nuovo Cim 19, 853–863 (1961). https://doi.org/10.1007/BF02731230
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DOI: https://doi.org/10.1007/BF02731230