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

Three-body Coulomb problem

Kinematically complete measurements

neutron-rich nuclei

he-6

decays

harmonics method

charge-exchange scattering

isotopes

light-nuclei

halo

Two-proton decay

spectra

Hyperspherical

excitations

Be-6

Författare

A. S. Fomichev

Joint Institute for Nuclear Research (JINR)

V. Chudoba

Slezska univerzita v Opave

Joint Institute for Nuclear Research (JINR)

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

Helmholtz

National Research Centre "Kurchatov Institute"

Joint Institute for Nuclear Research (JINR)

G. Kaminski

Polish Academy of Sciences

Joint Institute for Nuclear Research (JINR)

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

Joint Institute for Nuclear Research (JINR)

Polish Academy of Sciences

Mikhail Zhukov

Chalmers, Teknisk fysik, Subatomär fysik

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

0370-2693 (ISSN)

Vol. 708 1-2 6-13

Ämneskategorier

Fysik

DOI

10.1016/j.physletb.2012.01.004

Mer information

Senast uppdaterat

2020-09-15