Summary
Extensive-air-shower subcores were observed by the 54 m2 spark chamber array at Mt. Norikura. The only subcores whose axes did not hit iron beams of the roof covering the array—34.6% of all the subcores we picked up—were analysed for estimation of P T against the EAS axis by comparing their lateral structures with Nishimura-Kidd's curves of electromagnetic-cascade showers induced by pair photons. The P T spectrum agrees with calculations applying QCD to large-P T jets in the collision energy at several hundred TeV. The ratio of the cross-section with P T≥15 GeV/c against the total inelastic one is 0.002.
Riassunto
Sono stati osservati subnoccioli di sciami cosmici dell'aria mediante il sistema di camere a scintille di 54 m2 al Mt. Norikura. Solo i sottonoccioli i cui assi non colpirono le travi di ferro del tetto che ricopre il sistema—il 34.6% di tutti i sottonoccioli raccolti —sono stati analizzati per stimare P T rispetto all'asse dell'EAS confrontando le loro strutture laterali con le curve di Nishimura-Kidd degli sciami di cascate elettromagnetiche indotti da fotoni in coppia. Lo spettro di P T è in accordo con calcoli che applicano la QCD a getti con grande P T ad un'energia di collisione di alcune centinaia di TeV. Il rapporto tra la sezione d'urto con P T≥15 GeV/c e quella inelastica totale è 0.002.
Резюме
Широкие атмосферные ливни наблюдались на вершине Норикура с помощью системы искровых камер с площадью 54 m2. Проведен анализ 34.6% из всех щироких атмосферных ливней для оценки поперечных импульсов по отношению к оси широкого ливня. Их поперечная структура сравнивается с кривыми Нищимура-Кидда для электромагнитных каскадных ливней, образованными парными фотонами. Спектр поперечных импульсов согласуется с вычислениями с применением квантовой хромодинамики к струям с болышими поперечными импульсами при энергии соударения в несколько сотен ТзВ. Отнощение поперечного сечения с P T≥15 ГзВ/с к полному неупрутому поперечному сечению составляет 0.002.
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Nakatsuka, T., Nishikawa, K., Sakata, M. et al. Large-P T spectrum of EAS subcores observed by the 54 m2 spark chamber array at Mt. Norikura. Il Nuovo Cimento A (1971-1996) 78, 205–220 (1983). https://doi.org/10.1007/BF02778183
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DOI: https://doi.org/10.1007/BF02778183