Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 10: Poster Session: Nuclear Physics/Spectroscopy

HK 10.16: Poster

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

Measurement of the M1 and M2 spin-flip strength distribution in ⁴⁸Ca — •N. Blasi¹, C. Bäumer², A.M. van den Berg³, R. Bieber³, D. Frekers², M. Hagemann⁴, V.M. Hannen³, M.N. Harakeh³, J. Heyse⁴, F. Hofmann⁵, M.A. de Huu³, E. Jacobs⁴, Y. Kalmykov⁵, B.A.M. Krüsemann³, P. von Neumann-Cosel⁵, S. Rakers², B. Reitz⁵, A. Richter⁵, R. Schmidt², K. Schweda⁵, A. Shevchenko⁵, and H.J. Wörtche³ — ¹INFN, Milano (It) — ²IKP, Münster (De) — ³KVI, Groningen (Nl) — ⁴Universiteit Gent (B) — ⁵IKP, Darmstadt (De)

Polarization transfer observables in intermediate energy proton-nucleus scattering carry important information about details of the nuclear structure, which in many cases are difficult to extract otherwise. We have started to measure the transverse spin-flip probability S_nn with highest precision and statistics in ⁴⁸Ca scattering in order to disentangle the isovector spin-M1 and spin-M2 resonances. Of course, for further elucidation of the dynamics of spin magnetization, (e,e^′)-measurements are also required to provide additional clues for a consistent interpretation. Our first measurements were done on ⁴⁸Ca at the focal-plane polarimeter set-up of the AGOR BBS magnetic spectrometer at the KVI using polarized protons at 174 MeV. Spectral resolution of order 100 keV was achieved, and S_nn spectral functions of 250 keV bin size allow a first insight into details of the nuclear response. The poster will describe the novel techniques of the measurement and present various results. It will also describe some of the potentials for future measurements of spin observables at intermediate energies using the present facility.