Isoscalar quadrupole strength in Ca from the (p,p′α0) reaction at Ep = 100 MeV |
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Authors: | J Carter A A Cowley H Diesener R W Fearick S V Frtsch M N Harakeh J J Lawrie S J Mills P von Neumann-Cosel R T Newman J V Pilcher A Richter K Schweda F D Smit G F Steyn S Strauch D M Whittal |
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Institution: | J. Carter, A. A. Cowley, H. Diesener, R. W. Fearick, S. V. Förtsch, M. N. Harakeh, J. J. Lawrie, S. J. Mills, P. von Neumann-Cosel, R. T. Newman, J. V. Pilcher, A. Richter, K. Schweda, F. D. Smit, G. F. Steyn, S. Strauch,D. M. Whittal |
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Abstract: | The 40Ca(p,p′ α) reaction has been studied at an incident proton energy Ep = 99.5 MeV for proton laboratory scattering angles Θplab = 17°, 23° and 27°. Emission of α particles coincident with the scattered proton has been measured for an angular range Θα 0° − 180° relative to the recoil axis. A multipole decomposition for the α0-decay channel to the 36Ar ground state has been performed from the angular-correlation functions. The energy distribution of the dominating E2 strength deduced in the excitation energy range Ex = 11–21 MeV agrees reasonably well with the results from electron and α-induced α0-decay investigations. The exhaustion of the E2 energy-weighted sum rule in this channel up to an energy of 17 MeV is 16.1(4.0)%, in accord with the study of the (α, α′ α0) reaction. However, this value is twice what is found in the (e,e′ α0) experiment in the same energy region. Thus, the puzzling discrepancy in the E2 strengths derived from electromagnetic and hadronic probes remains unsolved. |
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Keywords: | Nuclear reaction |
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