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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.15: Poster

Dienstag, 12. März 2002, 10:30–12:45, Foyer Chemie

Investigation of the ¹S₀ n-n FSI using the d(d,²He)²n reaction - a technique to measure the n-n scattering length — •C. Bäumer¹, A.M. van den Berg², N. Blasi³, B. Davids², D. Frekers¹, D. De Frenne⁴, E. Grewe¹, M. Hunyadi², M.A. de Huu², E. Jacobs⁴, B. Junk¹, A. Negret⁴, S. Rakers¹, R. Schmidt¹, and H.J. Wörtche² — ¹Westfälische Wilhelms-Universität Münster, Germany — ²Kernfysisch Versneller Instituut, Groningen, The Netherlands — ³INFN Milano, Italy — ⁴Universiteit Gent, Belgium

The cross section for the d(d,²He)²n reaction at E_d=170 MeV and small momentum transfer has been measured. The experiment was carried out at the AGOR facility of the KVI (Groningen/NL). The two correlated protons of the ²He were momentum analyzed with the BBS magnetic spectrometer and detected in coincidence by the ESN-detector. An energy resolution of 140 keV was achieved.

The (d,²He) reaction is used to map out the ²n system with high precision. In the region of lowest momentum transfer the reaction is mediated by the Gamow-Teller transition operator which excites the di-neutron system predominantly into the ¹S₀ state. In the region of low internal momentum of the ²n system the shape of the ¹S₀ final-state interaction gives quantitative information about the neutron-neutron scattering length a_nn.

In this talk preliminary results are presented and the advantages of the d(d,²He)²n reaction over similiar approaches to extract a_nn are discussed.