ELSEVIER Nuclear Physics A731 (2004) 121~-128 www.elsevier.com/locate/npe Excitation and decay of the isovector spin-flip giant monopole resonance via the 208Pb(3He,tp) reaction at 410 MeV. R.G.T. Zegers a*, H. Abend ‘I, H. Akimune ‘, A.M. van den Berg ‘l, H. Fujimura e, H. Fujita , r Y. Fujita r, M. Fujiwara e, g, S. Gales h, K. Hara ‘, M.N. Harakeh d, T. Ishikawa i, T. Kawabata i, K. Kawase e, T. Mibe e, K. Nakanishi ‘, S. Nakayama j, H. Toyokawa k, M. Uchida i, T. Yamagata ‘, K. Yamasaki ’ and M. Yosoi i “National Superconducting Cyclotron Facility, Michigan State University, East Lansing, MI 48824, USA “College of Arts and Science, New York University, New York 10003, USA “Department of Physics, Konan University, 8-9-l Okamoto Higashinda, Kobe, Hyogo, 658-8501, Japan dKernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands “Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan ‘Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan “Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan i’Institute de Physique NuclCaire, IN2P3/CNRS, Universite de Paris-&id, 91406, Orsay Cedex, France ‘Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan jTokushima University, Tokushima, 770-8502 Tokushima, Japan kJapan Synchrotron Radiation Research Institute, Spring-8, Sayo, Hyogo 679-5198, Japan The excitation and subsequent decay by proton emission of the isovector spin-flip giant monopole resonance are studied via the 208Pb(3He, t) reaction at 410 MeV. In the triton- singles spectrum 60 & 5% of the non-energy-weighted sum-rule strength for this 2fiw resonance is found in the region 29 < E,(208Bi) < 51 MeV. The central excitation energy and width of the IVSGMR are determined to be 37f 1 MeV and 14f 3 MeV, respectively. -‘The authors wish to thank the technical staff at RCNP for their support. This work was supported in part by the French-Japan Cooperative Science Program, the STA fellowship program of JST and the “Stichting voor Fundamenteel Onderzoek der Materiel’ (FOM) with financial support from the “Nederlandse Organisatie voor Wetenschappelijk Onderzoek” (NWO). 03759474/$ - see front matter 0 2004 Elsevier B.V All rights reserved. doi:10.1016/j.nuclphysa.2OO3.11.024