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| VOLUME 110 (2019) | ISSUE 2 | PAGE 83 |
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The neutron structure of the ground state of 7He
B. A. Chernyshev+, A. S. Demyanova*, S. A. Goncharov×, Yu. B. Gurov+, S. V. Lapushkin+, A. A. Ogloblin*, V. G. Sandukovsky°, W. H. Trzaska∇
+National Research Nuclear University MEPhI, 115409 Moscow, Russia *National Research Center "Kurchatov Instirtute", 123182 Moscow, Russia ×Faculty of Physics, M. V. Lomonosov Moscow State University, 119991 Moscow, Russia °Joint Institute for Nuclear Research, 141980 Dubna, Russia ∇Department of Physics, University of Jyvaskyla, FIN-40014 Jyvaskyla, Finland
Abstract
A study of the neutron structure of the ground state of 7He has been performed by means of registration and analysis of the decay channels of the residual nuclei following absorption of stopped pions. In particular, the reactions 9Be( π-,d)X and 11B(π-,dd)X have been investigated where X denotes any system with five neutrons and two protons - the constituencies of a 7He nucleus. The results point out to the existence of a halo-like configuration of the ground state of 7He with all three neutrons outside of the alpha particle core. The structure of this complicated halo-like state is determined by the correlations of neutrons in the p3/2 and p1/2 shells. The result would be in agreement with the previous works pointing out to a considerable mixing of configurations containing neutrons in the p3/2 and p1/2 states. |