Isovector soft dipole mode in Be-6
Journal article, 2012

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.

Two-proton decay

resonance

Hyperspherical

decays

neutron-rich nuclei

charge-exchange scattering

light-nuclei

spectra

Three-body Coulomb problem

harmonics method

excitations

he-6

isotopes

Kinematically complete measurements

Be-6

halo

Author

A. S. Fomichev

Joint Institute for Nuclear Research (JINR)

V. Chudoba

Joint Institute for Nuclear Research (JINR)

Slezska univerzita v Opave

I. A. Egorova

Joint Institute for Nuclear Research (JINR)

S. N. Ershov

Joint Institute for Nuclear Research (JINR)

M. S. Golovkov

Joint Institute for Nuclear Research (JINR)

A. V. Gorshkov

Joint Institute for Nuclear Research (JINR)

V. A. Gorshkov

Joint Institute for Nuclear Research (JINR)

L. V. Grigorenko

Joint Institute for Nuclear Research (JINR)

National Research Centre "Kurchatov Institute"

Helmholtz

G. Kaminski

Joint Institute for Nuclear Research (JINR)

Polish Academy of Sciences

S. A. Krupko

Joint Institute for Nuclear Research (JINR)

I. G. Mukha

Helmholtz

Y. L. Parfenova

Moscow State University

Joint Institute for Nuclear Research (JINR)

S. I. Sidorchuk

Joint Institute for Nuclear Research (JINR)

R. S. Slepnev

Joint Institute for Nuclear Research (JINR)

Ł. Standyło

Joint Institute for Nuclear Research (JINR)

Instytut Problemow Jadrowyc

S. V. Stepantsov

Joint Institute for Nuclear Research (JINR)

G. M. Ter-Akopian

Joint Institute for Nuclear Research (JINR)

R. Wolski

Polish Academy of Sciences

Joint Institute for Nuclear Research (JINR)

Mikhail Zhukov

Chalmers, Applied Physics, Subatomic Physics

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

0370-2693 (ISSN)

Vol. 708 1-2 6-13

Subject Categories

Physical Sciences

DOI

10.1016/j.physletb.2012.01.004

More information

Latest update

3/22/2023