Isoscalar quadrupole strength in 40Ca from the (p,p′α0) reaction at Ep = 100 MeV

✍ Scribed by J. Carter; A.A. Cowley; H. Diesener; R.W. Fearick; S.V. Förtsch; M.N. Harakeh; J.J. Lawrie; S.J. Mills; P. von Neumann-Cosel; R.T. Newman; J.V. Pilcher; A. Richter; K. Schweda; F.D. Smit; G.F. Steyn; S. Strauch; D.M. Whittal

• Book ID: 104337170
• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 628 KB
• Volume: 630
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(98)00656-3

✦ Synopsis

The 4°Ca(p,p'a) reaction has been studied at an incident proton energy E o = 99.5 MeV for proton laboratory scattering angles ro lab = 17 °, 23 ° and 27 °. Emission of a particles coincident vp with the scattered proton has been measured for an angular range O4 -----0°-180 ° relative to the recoil axis. A multipole decomposition for the ao-decay channel to the 36Ar ground state has been performed from the angular-correlation functions. The energy distribution of the dominating E2 strength deduced in the excitation energy range Ex = 11-21 MeV agrees reasonably well with the results from electron and a-induced a0-decay investigations. The exhaustion of the E2 energyweighted sum rule in this channel up to an energy of 17 MeV is 16.1(4.0)%, in accord with the study of the (a, dao) reaction. However, this value is twice what is found in the (e,e'ao) experiment in the same energy region. Thus, the puzzling discrepancy in the E2 strengths derived from electromagnetic and hadronic probes remains unsolved. (~) 1998 Elsevier Science B.V.