Summary
The concept of « target mass » and « effective target mass » is discussed. Evidence is presented which questions the validity of attempting to relate the « effective target mass » to the concept of a virtual pion surrounding the nucleon. Eelations between the 4-momentum transfer, the quantity (E — P cos θ) of the recoil nucleon and the « effective target mass » are derived which show in conjunction with experimental data that the « effective target mass » of the order of a pion mass occurs accidentally.
Riassunto
Si discutono i concetti di « massa del bersaglio » e « massa eflettiva del bersaglio ». Si presentano argomenti che mettono in dubbio la validità del tentativo di mettere in relazione la « massa effettiva del bersaglio » col concetto di un pione virtuale che circondi il nucleone. Si deducono relazioni fra il quadrimomento trasferito, la quantità (E — P cos θ) del nucleone di rinculo e la «massa eflettiva del bersaglio», le quali, in unione ai dati sperimentali, mostrano che una « massa eflettiva del bersaglio » dell’ordino délia massa del pione si ha accidentalmente.
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This research was supported in part by the U. S. Air Force Office of Scientific Research under Grant no. AF-AFOSR-439-63 and by the Atomic Energy Commission under contract number AT(30-l)-875.
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Kaplon, M.F., Shen, M.L. «Target mass» and «effective target mass». Nuovo Cim 37, 423–429 (1965). https://doi.org/10.1007/BF02749844
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DOI: https://doi.org/10.1007/BF02749844