Determination of the Lifetime of Heavy {Lambda}-Hypernuclei at COSY Juelich
Conference
·
OSTI ID:784267
The lifetime of heavy hypernuclei has been determined at COSY Juelich, making use of the (p,K) reaction and the recoil-shadow technique based on the detection of fragments from the {Lambda}-decay induced fission. Hypernuclei were produced by bombarding extremely thin U and Bi targets with protons of 1.5 GeV and 1.9 GeV kinetic energy. High luminosity was achieved due to the multipass technique with the target being exposed to the internal beam of COSY. Position-sensitive low-pressure MWPCs permitted clear identification of fission fragments based on energy loss and TOF information. The lifetime of hypernuclei was deduced from the position distributions of fission events in the shadow region and from the recoil momentum calculated within the BUU model. Values of 240{+-}60 ps and 161{+-}14(syst.) ps were found with U and Bi targets, respectively. The deduced production cross sections for hot hypernuclei prior to the evaporation process of {sigma}=150{sub {minus}80}{sup +150} {mu}b for U and 350{+-}140 {mu}b for Bi are in agreement with the theoretical predictions.
- Research Organization:
- Institut fuer Kernphysik, Forschungszentrum Juelich, Juelich (DE); Institut fuer Theoretische Physik, Universitaet Giessen, Giessen (DE); M. Smoluchowski Institute of Physics, Jagellonian University, Cracow (PL); Technologielaboratorium, LMU Muenchen, Garching (DE); Department of Nuclear Engineering, Kyushu University, Fukuoka (JP); H. Niewodniczanski Institute of Nuclear Physics, Cracow (PL); The Andrzej Soltan Institute for Nuclear Studies, Swierk (PL)
- Sponsoring Organization:
- German DLR International Bureau of the BMBF; Polish Committee for Scientific Research (US)
- OSTI ID:
- 784267
- Report Number(s):
- NONE; ISBN 1-56396-928-9; ISSN 0094-243X; CODEN APCPCS; ISBN 1-56396-928-9; ISSN 0094-243X; CODEN APCPCS
- Country of Publication:
- United States
- Language:
- English
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