2004/05/27 by Pranab Saha, P. K. Saha, H. Noumi +46 · 1 citation
Chemistry · Physics and Astronomy · #Advanced NMR Techniques and Applications #Nuclear physics research studies #Quantum Chromodynamics and Particle Interactions #nucl-ex
paper · pdf · doi:10.1103/physrevc.70.044613
published as Phys.Rev. C70 (2004) 044613 · 21 pages, 24 figures, submitted to PRC
arxiv created 2004/05/27 · openalex publication_date 2004/10/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In order to study the \ensuremathΣ-nucleus optical potential, we measured inclusive (\ensuremathπ^\ensuremath-,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+\ensuremathπ^\ensuremath-\ensuremath→K++\ensuremathΣ^\ensuremath-, where the C spectrum was also extracted. The calibration was done with \ifmmode±\else\textpm\fi0.1\phantom\rule0.3em0exMeV 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 (\ensuremathπ^\ensuremath-,K+) spectra were also well calibrated. All of the inclusive spectra were found to be similar in shape at a region near to the \ensuremathΣ^\ensuremath- 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 \ensuremathΣ-nucleus potential with a nonzero size of the imaginary part is required to reproduce the shape of the measured spectra.