@article{c6bf7830ddba4f9a97144dbb7a8fc364,
title = "σ-nucleus potential studied with the (π-,K +) reaction on medium-to-heavy nuclear targets",
abstract = "In order to study the σ-nucleus optical potential, we measured inclusive (π- ,K+) spectra on medium-to-heavy nuclear targets CH2, Si, Ni, In, and Bi. The CH2 target was used to calibrate the excitation energy scale by using the elementary process p + π- → K- + σ-, where the C spectrum was also extracted, The calibration was done with ±0.1 MeV precision. The angular distribution of the elementary cross section was measured and agreed well with the previous bubble chamber data, but with better statistics, and the magnitudes of the cross sections of the measured inclusive (π- ,K+) spectra were also well calibrated. All of the inclusive spectra were found to be similar in shape at a region near to the σ- binding energy threshold, showing a weak mass-number dependence on the magnitude of the cross section. The measured spectra were compared with a theoretical calculation performed within the framework of the distorted-wave impulse approximation. It has been demonstrated that a strongly repulsive σ-nucleus potential with a nonzero size of the imaginary part is required to reproduce the shape of the measured spectra.",
author = "Saha, {P. K.} and H. Noumi and D. Abe and S. Ajimura and K. Aoki and Bhang, {H. C.} and K. Dobashi and T. Endo and Y. Fujii and T. Fukuda and Guo, {H. C.} and O. Hashimoto and H. Hotchi and K. Imai and Kim, {E. H.} and Kim, {J. H.} and T. Kishimoto and A. Krutenkova and K. Maeda and T. Nagae and M. Nakamura and H. Outa and T. Saito and A. Sakaguchi and Y. Sato and R. Sawafta and M. Sekimoto and Y. Shimizu and T. Takahashi and H. Tamura and L. Tang and K. Tanida and T. Watanabe and Xia, {H. H.} and Zhou, {S. H.} and Zhu, {X. F.} and Zhu, {L. H.}",
note = "Funding Information: The authors are grateful to Professor Y. Akaishi, Professor T. Harada, and Dr. T. Koike for many invaluable discussions and inspiring comments in the analysis stage of the present experiment. They also thank Dr. R. E. Chrien for proofreading this article. They would like to express their sincere gratitude to Professor K. Nakamura, the head of KEK Physics division III, and Professor Yoshimura, former coordinator of EPPC (Experimental planning and Program Coordination), for their encouragement and extended helping hands to perform the present experiment. They greatly thank to all staff members of KEK-PS as well as the accelerator and the beam channel group members for delivering a stable proton beam. A stable operation of the SKS system by Y. Kakiguchi is also highly appreciated. Indispensable support from the Counter-Experimental Hall group, Online/Electronics, and Cryogenics groups is also greatly appreciated. One of the authors, P.K.S., was supported by the JSPS (Japan Society for the Promotion of Science) (Grant No. P01186).",
year = "2004",
month = oct,
doi = "10.1103/PhysRevC.70.044613",
language = "English",
volume = "70",
pages = "044613--1--044613--20",
journal = "Physical Review C - Nuclear Physics",
issn = "0556-2813",
publisher = "American Physical Society",
number = "4",
}