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Phys. Rev. Lett. 90, 202501 (2003) [4 pages]

Excitation and Decay of the Isovector Giant Monopole Resonances via the 208Pb(3He,tp) Reaction at 410 MeV

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R. G. T. Zegers1,2, H. Abend3, H. Akimune4, A. M. van den Berg5, H. Fujimura1, H. Fujita6, Y. Fujita6, M. Fujiwara1,2, S. Galès7, K. Hara1, M. N. Harakeh5, T. Ishikawa8, T. Kawabata8, K. Kawase1, T. Mibe1, K. Nakanishi1, S. Nakayama9, H. Toyokawa10, M. Uchida8, T. Yamagata4, K. Yamasaki4, and M. Yosoi8
1Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
2Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
3College of Arts and Science, New York University, New York 10003
4Department of Physics, Konan University, 8-9-1 Okamoto Higashinda, Kobe, Hyogo, 658-8501, Japan
5Kernfysisch Versneller Instituut, Zernikelaan 25, 9747 AA Groningen, The Netherlands
6Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan
7Institute de Physique Nucléaire, IN2P3/CNRS, Université de Paris-Sud, 91406, Orsay Cedex, France
8Department of Physics, Kyoto University, Kyoto, Kyoto 606-8502, Japan
9Tokushima University, Tokushima, 770-8502 Tokushima, Japan
10Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan

Received 18 August 2002; published 20 May 2003

The excitation and subsequent proton decay of the isovector spin-flip giant monopole resonance (IVSGMR) is studied via the 208Pb(3He,t) reaction at 410 MeV. In the inclusive spectrum (60±5)% of the non-energy-weighted sum-rule strength for this 2ℏω resonance was found in the region 29<Ex(208Bi)<51   MeV. The central excitation energy and width of the IVSGMR are 37±1   MeV and 14±3   MeV, respectively. It is found that the branching ratio for proton decay is (52±12)% and that the deep neutron-hole states in 207Pb are strongly fed.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.202501
DOI:
10.1103/PhysRevLett.90.202501
PACS:
24.30.Cz, 25.55.Kr, 27.80.+w
 
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