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Isovector soft dipole mode in Be-6

A. S. Fomichev ; V. Chudoba ; I. A. Egorova ; S. N. Ershov ; M. S. Golovkov ; A. V. Gorshkov ; V. A. Gorshkov ; L. V. Grigorenko ; G. Kaminski ; S. A. Krupko ; I. G. Mukha ; Y. L. Parfenova ; S. I. Sidorchuk ; R. S. Slepnev ; L. Standylo ; S. V. Stepantsov ; G. M. Ter-Akopian ; R. Wolski ; Mikhail V. Zhukov (Institutionen för fundamental fysik, Subatomär fysik)
Physics Letters B (0370-2693). Vol. 708 (2012), 1-2, p. 6-13.
[Artikel, refereegranskad vetenskaplig]

By using the H-1(Li-6,Be-6)n charge-exchange reaction, population of continuum states in Be-6 was observed up to E-T = 16 MeV, E-T being the Be-6 energy above its three-body decay threshold. In kinematically complete measurements performed by detecting alpha + p + p coincidences, an E-T spectrum of high statistics was obtained, containing approximately similar to 5 x 10(6) events. The spectrum provides detailed correlation information about the well-known 0(+) ground state of Be-6 at E-T = 1.37 MeV and its 2(+) state at E-T = 3.05 MeV. Moreover, a broad structure extending from 4 to 16 MeV was observed. It contains negative parity states populated by Delta L = 1 angular momentum transfer without other significant contributions. This structure can be interpreted as a novel phenomenon, i.e. the isovector soft dipole mode associated with the Li-6 ground state. The population of this mode in the charge-exchange reaction is a dominant phenomenon for this reaction, being responsible for about 60% of the cross-section obtained in the measured energy range.

Nyckelord: Be-6, Two-proton decay, Three-body Coulomb problem, Hyperspherical, harmonics method, Kinematically complete measurements, charge-exchange scattering, neutron-rich nuclei, light-nuclei, he-6, halo, excitations, resonance, isotopes, spectra, decays

Denna post skapades 2012-05-16.
CPL Pubid: 157644


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Institutionen för fundamental fysik, Subatomär fysik (2005-2013)



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