Giant resonance decays in 20Ne, 22Ne and interference effects with quasifree scattering processes |
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| Institution: | 1. Department of Urology, School of Medicine, Stanford University, Stanford, California;2. Department of Maternal-Infant and Urological Sciences, “Sapienza” Rome University, Policlinico Umberto I Hospital, Rome, Italy;3. Department of Obstetrics and Gynecology, School of Medicine, Stanford University, Stanford, California;1. College of Life Sciences, Zhejiang University, Hangzhou 310058, China;2. Department of Environment and Agriculture, Curtin University, Kings Park, Perth, Australia;3. State Key Laboratory of Subtropical Silviculture, Zhejiang A & F University, Lin''an 311300, China;1. Laboratory of Social Evolution and Behavior, The Rockefeller University, New York, NY 10065, USA;2. Laboratory of Neurogenetics and Behavior, The Rockefeller University, New York, NY 10065, USA;3. Howard Hughes Medical Institute, Chevy Chase, MD 23930, USA;1. Freie Universität Berlin, Institute of Chemistry and Biochemistry, Takustr. 3, 14195 Berlin, Germany;2. McGill University, Department of Pharmacology & Therapeutics, Faculty of Medicine, 3655 Promenade Sir-William-Osler, H3G 0B1 Montréal, QC, Canada |
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| Abstract: | The charged particle (c) decay from excited states up to the giant quadrupole resonance (GQR) in 20Ne has been studied in a kinematically complete 20Ne(α, α′ c) coincident experiment at Eα = 155 MeV. Angular correlation functions and branching ratios are extracted for the α0, α1 and p0 decay channels. The (α, α′ α0) angular correlation functions are analysed in PWBA in terms of coherent interference with the quasifree scattering process leading to the same final states. Good fits to the data are achieved over a large range of excitation energies. Branching ratios have been extracted and compared to results of Hauser-Feshbach calculations. Above Ex = 12.5 MeV excitation energy a discrepancy was found between the experimentally observed α0 branching ratios and the HF predictions. These results yield evidence for a direct α0 decay mechanism of the split isoscalar giant quadrupole resonance in 20Ne. Some results are presented also for a 22Ne(α, α′ c) coincidence experiment. Qualitative comparison has been made between the general decay behaviour of the two Ne isotopes. |
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