Elsevier

Physics Letters B

Volume 506, Issues 3–4, 10 May 2001, Pages 247-253
Physics Letters B

Low-energy isoscalar quadrupole strength in 40Ca and 48Ca from (p,p′x) reactions

https://doi.org/10.1016/S0370-2693(01)00230-1Get rights and content

Abstract

A decomposition of giant multipole strength in 40Ca and 48Ca is performed from angular correlations and emission angle-integrated angular distributions of the reactions 40Ca(p, p′α0)36Ar, 40Ca(p, p′p0)39K and 48Ca(p,pn0)47Ca. The deduced B(E2) strength distributions agree reasonably well in shape and magnitude with the results of electron-induced experiments. Previous suggestions of a systematic discrepancy of the total E2 strengths in the α0 channel derived from hadronic and electromagnetic probes are shown to be unfounded. In 48Ca, for the first time evidence for sizable isoscalar E2 strength at low excitation energies, similar to 40Ca, could be established.

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Acknowledgements

The Darmstadt group (H.D., P.v.N.-C., A.R., K.S. and S.S.) would like to express its gratitude to the Director J. Sharpey-Schafer and his staff for the generous hospitality experienced during extensive visits to the NAC. Y. Fujita, M.N. Harakeh, H. Lenske, and A. van der Woude are thanked for useful discussions, and D. Frekers for the loan of the precious 48Ca target. We are particularly grateful to M.N. Harakeh for generously providing us with the various codes applied in the ACF analysis.

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      The GQR in 40Ca is fragmented in at least two components, one centered at around 14.0 MeV and the other around 17.8 MeV, each exhausting around 40% of the EWSR [1]. Its decay by alpha-particles has already been studied with different probes: alpha-particle inelastic scattering [8–10], proton inelastic scattering [11] and electron inelastic scattering [12–14]. These previous data did not indicate a significant deviation from what is expected from statistical decay.

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    Supported by the NRF (South Africa) and by the DFG under contract FOR 272/2-1.

    1

    Present address: Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

    2

    Present address: EDS, D-63067 Offenbach, Germany.

    3

    Present address: Rutgers University, Department of Physics and Astronomy, Piscataway, NJ 08854, USA.

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