Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 22: Postersitzung

HK 22.23: Poster

Monday, March 7, 2005, 16:30–18:00, TU MA141

Low-energy transfer reactions with a ⁹Li beam^* — •Thomas Nilsson — Institut für Kernphysik, Technische Universität Darmstadt

The recently commissioned post-accelerator for radioactive beams REX-ISOLDE enables the majority of the ∼700 nuclides available at CERN-ISOLDE to be post-accelerated to 0.3-3.1 MeV/u[1]. This permits an unprecedented range of exotic nuclei to be experimentally investigated through low-energy reactions.

The first experimental results of transfer reactions following ⁹Li incident on a deuterated polypropylene target at 2.36 MeV/u are presented. ⁹Li constitutes the core of the emblematic two-neutron halo nucleus ¹¹Li and its unbound two-body subsystem ⁹Li + n can be studied through ²H(⁹Li,p) reactions. In addition, several further reaction products were observed, d, t, ⁴He and ⁶He[2]. The ²H(⁹Li,t)⁸Li^* channel is of special interest in conjunction with new ab-initio[3] and shell-model[4] calculations, both predicting hitherto unobserved excited states in ⁸Li. The experimental data are generally well described by population of the ground state and the three first excited states, however, a small discrepancy at ∼4 MeV could offer a first glimpse of additional states.

^*This work was supported by the BMBF under the contract 06DA115.

[1] D. Habs et al., Hyp. Int. 129 (2000) 43

[2] H.B. Jeppesen et al., submitted to Nucl. Phys. A

[3] S.C. Pieper and R.B. Wiringa, Annu. Rev. Nucl. Part. Sci. 51 (2001) 53

[4] D. Kurath, Private communication to A. Richter