Nuclear structure studies of bound and unbound states in drip-line nuclei

Bohlen, HG von Oertzen, W Kalpakchieva, R Blazevic, A Gebauer, B Grimes, SM Lepine-Szily, A Massey, TN Mittig, W Ostrowski, AN Oliveira, JM Roussel-Chomaz, P Thummerer, S Wilpert, M

Hg. Bohlen et al., Nuclear structure studies of bound and unbound states in drip-line nuclei, NUOV CIM A, 111(6-7), 1998, pp. 841-846

8

INGLESE

Article

Physics

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS

1124-1861 → ACNP

111

6-7

1998

841 - 846

ISI

1124-1861(199806/07)111:6-7<841:NSSOBA>2.0.ZU;2-V

The structure of the neutron-rich isotopes He-7, Li-10 and Be-11 has been s tudied in detail using multi-nucleon transfer reactions. New results have b een obtained for He-7, where we have evidence for the observation of the fi rst excited state, i.e. the 1/2(-)-resonance, which is of interest for the spin-orbit splitting in these light neutron-rich nuclei. Reactions of disti nct selectivity have been chosen to study the states of Li-10, which are al l unbound. The structure of the eight states found in these reactions is di scussed, and the relevance for the decay of Li-11 resonances is shown. The isotopes Be-10 and Be-11 have been investigated to study the alpha-cluster structure and high-lying states. Nine states of the observed Be-11-resonanc es form a molecular rotational band. The multi-nucleon transfer mechanism h as also been applied to study the unbound proton-rich isotope N-11, the mir ror nucleus of Be-11. In this case the C-12(N-14,C-15)N-11-reaction has bee n used. Five resonances have been observed, and the lowest two can be ident ified as 1/2(-)- and 5/2(+)-states.