Isovector soft dipole mode in Be-6
Artikel i vetenskaplig tidskrift, 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.

resonance

excitations

Be-6

Three-body Coulomb problem

isotopes

spectra

neutron-rich nuclei

Two-proton decay

decays

he-6

halo

Hyperspherical

light-nuclei

Kinematically complete measurements

harmonics method

charge-exchange scattering

Författare

A. S. Fomichev

Joint Institute for Nuclear Research

V. Chudoba

Joint Institute for Nuclear Research

Slezska univerzita v Opave

I. A. Egorova

Joint Institute for Nuclear Research

S. N. Ershov

Joint Institute for Nuclear Research

M. S. Golovkov

Joint Institute for Nuclear Research

A. V. Gorshkov

Joint Institute for Nuclear Research

V. A. Gorshkov

Joint Institute for Nuclear Research

L. V. Grigorenko

GSI Helmholtzzentrum für Schwerionenforschung

Joint Institute for Nuclear Research

National Research Centre "Kurchatov Institute"

G. Kaminski

Joint Institute for Nuclear Research

Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences

S. A. Krupko

Joint Institute for Nuclear Research

I. G. Mukha

GSI Helmholtzzentrum für Schwerionenforschung

Y. L. Parfenova

Joint Institute for Nuclear Research

Moscow State University

S. I. Sidorchuk

Joint Institute for Nuclear Research

R. S. Slepnev

Joint Institute for Nuclear Research

Ł. Standyło

Joint Institute for Nuclear Research

Instytut Problemow Jadrowyc

S. V. Stepantsov

Joint Institute for Nuclear Research

G. M. Ter-Akopian

Joint Institute for Nuclear Research

R. Wolski

Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences

Joint Institute for Nuclear Research

Mikhail Zhukov

Chalmers, Teknisk fysik, Subatomär fysik

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

0370-2693 (ISSN)

Vol. 708 6-13

Ämneskategorier

Fysik

DOI

10.1016/j.physletb.2012.01.004