The two-pion exchange NN potential in nuclear matter and nuclear stability |
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| Institution: | 1. Institüt für Kernphysik, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany;2. Department of Physics, SUNY at Stony Brook, Stony Brook, NY 11794-3800, USA;3. Physics Department, Mount Holyoke College, South Hadley, MA 01075, USA;4. Institüt für Kernphysik, Schloßgartenstr. 9, TH-Darmstadt, D-64289 Darmstadt, Germany;1. International Institute of Finance, School of Management, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, China;2. School of Management, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui, China;1. Metabolic Disease Research Center, Zhengzhou University Affiliated Zhengzhou Central Hospital, Zhengzhou, 450007, China;2. Research Center for Basic Medicine, Academy of Medical Sciences, Zhengzhou University, Zhengzhou, 450052, China;3. Key laboratory of Zhengzhou Obesity and Metabolic Diseases, Zhengzhou, Zhengzhou, 450007, China;1. ESIC Business & Marketing School, Barcelona, Spain;2. ESIC Business & Marketing School, ESIC University, Barcelona, Spain;1. College of Education, Health and Human Performance, Fairmont State University, Fairmont, WV, USA;2. College of Applied Human Science, West Virginia University, Morgantown, WV, USA;3. Programa de Pós-graduação em Ciências Aplicadas à Saúde, Universidade Federal de Jataí, Jataí, Brazil;4. College of Liberal Arts, Community Health Fairmont State University, Fairmont, WV, USA;5. Department of Health Promotion and Development, School of Nursing, University of Pittsburgh, Pittsburgh, PA, USA |
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| Abstract: | A meson exchange model of the ππ interaction which fits free ππ scattering data is used to calculate the interactions of pions in nuclear matter as a function of nuclear density. Polarization of the nuclear medium by the pions results in a marked increase in the s-wave ππ attraction at low energy. The influence of this effect on the nucleon-nucleon interaction is a corresponding increase with density of the NN central potential due to the exchange of two correlated pions, resulting in an NN interaction which fails to saturate. A possible mechanism for restoring the theoretical stability of nuclear matter is explored and found to be effective. |
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