A coupled-channels treatment of the positive-parity resonances in4He |
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| Authors: | S Ramavataram G Do Dang |
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| Institution: | 1. Oak Ridge National Laboratory, Oak Ridge, Tennessee, USA
2. Laboratoire de Physique Théorique et Hautes Energies, Laboratoire associé au Centre National de la Recherche Scientifique, Université de Paris-Sud, Orsay, France
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| Abstract: | The coupled-channels formalism, which has been previously applied successfully to interpret the negative-parity resonances in4He, has now been extended to the positiveparity 2?ω resonances in this system. The 1p-1h approach has been modified to include coupling to the 2p-2h configurations, which also belong to 2?ω excitations, by using the effective operator formalism. The effect of the Pauli term in thes-wave channel is examined and is found to be important in reproducing the 0+,T=0 resonance energy and width. Resonances with spins up toJ π=3+ have been studied, and the agreement with available data is satisfactory. In particular, from the good fit to the asymmetry coefficientβ(E), one establishes the presence of a 2+,T=0 resonance around 35-MeV excitation in the system. |
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