K-series X-ray yield measurement of kaonic hydrogen atoms in a gaseous target

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• 作者：M. Bazzi^a ; G. Beer^b ; G. Bellotti^c ; ^d ; C. Berucci^e ; ^a ; A.M. Bragadireanu^f ; ^a ; D. Bosnar^g ; M. Cargnelli^e ; C. Curceanu^a ; A.D. Butt^c ; ^d ; A. d'Uffizi^a ; C. Fiorini^c ; ^d ; F. Ghio^h ; C. Guaraldo^a ; R.S. Hayanoⁱ ; M. Iliescu^a ; T. Ishiwatari^e ; M. Iwasaki^j ; P. Levi Sandri^a ; J. Marton^e ; S. Okada^j ; D. Pietreanu^f ; ^a ; K. Piscicchia^a ; ^k ; A. Romero Vidal^l ; E. Sbardella^a ; A. Scordo^a ; H. Shi^a ; ^{hexishi@lnf.infn.it" class="auth_mail" title="E-mail the corresponding author} ; ; D.L. Sirghi^a ; ^f ; F. Sirghi^a ; ^f ; H. Tatsuno^m ; ⁿ ; O. Vazquez Doce^o ; E. Widmann^e ; J. Zmeskal^e
• 关键词：Kaonic atom ; Kaonic hydrogen ; Atomic cascade ; X-ray spectroscopy
• 刊名：Nuclear Physics A
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：954
• 期：Complete
• 页码：7-16
• 全文大小：496 K

文摘

We measured the K  -series X-rays of the K⁻p$K^{-}p$ exotic atom in the SIDDHARTA experiment with a gaseous hydrogen target of 1.3 g/l$1.3\text{g}/\text{l}$, which is about 15 times the ρ_STP${\rho }_{\mathrm{STP}}$ of hydrogen gas. At this density, the absolute yields of kaonic X-rays, when a negatively charged kaon stopped inside the target, were determined to be ${0.012}_{-0.003}^{+0.004}$ for K_α$K_{\alpha }$ and ${0.043}_{-0.011}^{+0.012}$ for all the K  -series transitions K_tot$K_{\mathit{tot}}$. These results, together with the KEK E228 experiment results, confirm for the first time a target density dependence of the yield predicted by the cascade models, and provide valuable information to refine the parameters used in the cascade models for the kaonic atoms.