Probing the Li-11 halo structure through beta-decay into the Be-11(*) (18 MeV) state

• An experimental study of beta-delayed charged particles (H, He, Be) from Li-11 shows a beta-feeding to an excited state at 18.15(15) MeV in Be-11 with a large Gamow-Teller strength, B-GT greater than or equal to 1.6. Branching ratios and reduced widths of 2-, 3- and 5- particle decay channels of this state are extracted, A strong suppression of the neutron branch from the 18 MeV state to the Be-10(g.s.) is observed, We suggest that the measured partial width may be sensitive to the (p(1/2))(2) component in the Li-11 halo, A rough estimate indicates that the (p(1/2))(2) component is not the dominant one in the halo wave-function.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

RADIOACTIVITY Li-11(beta(-))

He

DEUTERON

Delta E-E

[Ta+p] reaction

Be spectra

telescope

branching ratios

deduced Garnow-Teller strength and

measured beta-delayed H

on-line mass separation

energy level at 18.15 MeV in Be-11

BE-11

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