EPJ

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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 13, 33-37 (2002)

Low-lying states of $\chem{^6He}$ studied via the $\chem{^6Li(t,\,^3He)^6He}$ reaction

T. Nakamura

Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-okayama, Meguro, Tokyo 152-8551, Japan

nakamura@ap.titech.ac.jp

(Received: 1 May 2001 / Revised version: 31 August 2001)

Abstract
We present the recent experimental results on the 6He structure studied by the 6Li(t, 3He) 6He reaction at 336 MeV. Above the conspicuous peaks for ground and first excited states for 6He, we have observed a broad structures at $E_{\rm x}\sim5$ MeV, and $E_{\rm x}\sim15$ MeV. The angular distribution of this structure exhibits the dominance of a $\Delta L=1$ transition, indicating the existence of intruder dipole states at low excitation energies in 6He. A slight admixture of positive-parity states in this structure has been indicated as well.

PACS
25.60.Lg - Charge-exchange reactions.
21.10.Pc - Single-particle levels and strength functions.
27.20.+n - $6 \leq A \leq 19$ .

© Società Italiana di Fisica, Springer-Verlag 2002

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