Fission of heavy hypernuclei formed in antiproton annihilation

Journal Article · Sat May 01 04:00:00 EDT 1993 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.47.1957· OSTI ID:6651269

Armstrong, T A; Bocquet, J P; Ericsson, G; Johansson, T; Krogulski, T; Lewis, R A; Malek, F; Maurel, M; Monnand, E; Mougey, J; Nifenecker, H; Passaneau, J; Perrin, P; Polikanov, S M; Rey-Campagnolle, M; Ristori, C; Smith, G A; Tibell, G ^[1]

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1. Pennsylvania State University; University Park; Pennsylvania 16802 (United States) Institut des Sciences Nucleaires; Institut National de Physique Nucleaire et de Physique des Particles; Centre National de la Recherche Scientifique and University of Grenoble; Grenoble; CEDEX (France) Department of Radiation Sciences; Uppsala University; P. O. Box 535; S-75121 Uppsala (Sweden) Warsaw University; Bialystok Branch; PL-15-424 Bialystok (Poland) DRFMC; Centre d'Etudes Nucleaires de Grenoble; Boite Postale 85X; 3804 1 Grenoble (France) Continuous Electron Beam Accelerator Facility; Newport News; Virginia 23606 (United States) Gesellschaft fuer Schwerionenforschumg Darmstadt; Postfach 110541; D-6100 Darmstadt (Germany) Centre de Spectrometr

Heavy hypernuclei are produced in the annihilation of antiprotons in [sup 238]U. The delayed fission of heavy hypernuclei and hypernuclei of fission fragments are observed by using the recoil-distance method in combination with measurement of secondary electron multiplicity. The lifetime of hypernuclei in the region of uranium is found to be (1.25[plus minus]0.15)[times]10[sup [minus]10] sec. It is observed that [Lambda] hyperons predominantly stick to the heavier fission fragments. The yield of hypernuclei is found to be (7.4[plus minus]1.7)[times]10[sup [minus]3] per stopped antiproton. No coincidences with [ital K][sup +] were found. Statistical and systematic errors on the number of events expected do not rule out this possibility.

• OSTI ID: 6651269
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 47:5; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

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663430 -- Nucleon-Induced Reactions & Scattering-- (1992-)
663590 -- Nuclear Mass Ranges-- A=220 & Above-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANNIHILATION
ANTINUCLEON REACTIONS
ANTIPROTON REACTIONS
BARYON REACTIONS
BARYONS
BASIC INTERACTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON EMISSION
ELEMENTARY PARTICLES
EMISSION
FERMIONS
FISSION
HADRON REACTIONS
HADRONS
HYPERNUCLEI
HYPERONS
INTERACTIONS
LAMBDA BARYONS
LIFETIME
MULTIPLICITY
NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
PARTICLE INTERACTIONS
RECOILS
STRANGE PARTICLES
TARGETS
URANIUM 238 TARGET