Two new low-lying 6He levels at excitation energies of about 2.4 MeV and 2.9 MeV were observed in the experimental investigation of the p-α coincidence spectra obtained by the 3H(4He, pα)2n four-body reaction at E4He beam energy of 27.2 MeV. The relevant E∗ peak energy and Γ energy width spectroscopic parameters for such 6He∗ excited states decaying into the α + n + n channel were obtained by analyzing the bidimensional (Ep, Eα) energy spectra. The present new result of two low-lying 6He∗ excited states above the 4He + 2n threshold energy of 0.974 MeV is important for the investigation of the nuclear structure of neutron-rich light nuclei and also as a basic test for theoretical models in the study of the three-cluster resonance feature of 6He.
First measurement of the 2.4 MeV and 2.9 MeV6He three-cluster resonant states via the3H(4He, pα)2n four-body reaction
MANDAGLIO, GIUSEPPE
Primo
Writing – Original Draft Preparation
;ANASTASI, ANTONIO;CURCIARELLO, FRANCESCA;DE LEO, VERONICA;FAZIO, Giovanni;GIARDINA, Giorgio 42
2014-01-01
Abstract
Two new low-lying 6He levels at excitation energies of about 2.4 MeV and 2.9 MeV were observed in the experimental investigation of the p-α coincidence spectra obtained by the 3H(4He, pα)2n four-body reaction at E4He beam energy of 27.2 MeV. The relevant E∗ peak energy and Γ energy width spectroscopic parameters for such 6He∗ excited states decaying into the α + n + n channel were obtained by analyzing the bidimensional (Ep, Eα) energy spectra. The present new result of two low-lying 6He∗ excited states above the 4He + 2n threshold energy of 0.974 MeV is important for the investigation of the nuclear structure of neutron-rich light nuclei and also as a basic test for theoretical models in the study of the three-cluster resonance feature of 6He.Pubblicazioni consigliate
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