<p>The structure of the halo nucleus<sup> 6</sup>He has been investigated in a pionic fusion experiment at the CELSIUS storage ring facility in Uppsala. The <sup>4</sup>He(d, <sup>6</sup>He)π<sup>+</sup> reaction was studied 0.6 - 5.0 MeV above threshold in the centre-of-mass frame with a deuteron beam incident on a <sup>4</sup>He gas target. The <sup>6</sup>He ions were detected in a ΔE - E solid-state detector telescope inserted into the CELSIUS ring. The results for the total and differential cross section are presented and compared to results for the analogue reaction producing the 3.56 MeV analogue state in <sup>6</sup>Li. A simple model of the reaction gives results consistent with earlier findings of <sup>6</sup>He as having a spatial extent considerably exceeding that of the alpha particle. It is also shown that information about the high momentum part of the halo wave function can be extracted from the results of this pionic fusion measurement.</p>
| Identifer | oai:union.ndltd.org:UPSALLA/oai:DiVA.org:su-1356 |
| Date | January 2006 |
| Creators | Gerén, Linda |
| Publisher | Stockholm University, Department of Physics, Stockholm : Fysikum |
| Source Sets | DiVA Archive at Upsalla University |
| Language | English |
| Detected Language | English |
| Type | Doctoral thesis, comprehensive summary, text |
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