Münster 2002 – scientific programme
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HK: Physik der Hadronen und Kerne
HK 10: Poster Session: Nuclear Physics/Spectroscopy
HK 10.15: Poster
Tuesday, March 12, 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 Ed=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 ann.
In this talk preliminary results are presented and the advantages of the d(d,2He)2n reaction over similiar approaches to extract ann are discussed.