Role of {sup 8}Be {yields} 2 {alpha} intermediate nuclei in the fragmentation of {sup 16}O relativistic nuclei in nuclear track emulsions

In searches along a track in the chamber irradiated at the Laboratory of High Energies at the Joint Institute for Nuclear Research (JINR, Dubna) with oxygen ions accelerated to a momentum of 4.5 GeV/c per nucleon, 215 events containing two or more doubly charged fragments of the primary nucleus were...

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Bibliographic Details
Published in:Physics of atomic nuclei 2012-08, Vol.75 (8)
Main Authors: Lepekhin, F. G., Tkach, L. N.
Format: Article
Language:English
Subjects:
ALPHA DECAY
ALPHA PARTICLES
BERYLLIUM 8
EXCITED STATES
GEV RANGE
GROUND STATES
NUCLEAR EMULSIONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
OXYGEN 16
OXYGEN 16 BEAMS
PARITY
PARTICLE TRACKS
RELATIVISTIC RANGE
SPIN
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Summary:In searches along a track in the chamber irradiated at the Laboratory of High Energies at the Joint Institute for Nuclear Research (JINR, Dubna) with oxygen ions accelerated to a momentum of 4.5 GeV/c per nucleon, 215 events containing two or more doubly charged fragments of the primary nucleus were found. Emission angles in the track-emulsion plane were measured in these events. Their distribution is consistent with that which alpha particles are expected to have in an oxygen nucleus prior to its interaction with a track-emulsion nucleus. Events of the {sup 16}O {yields} 2{sup 8}Be {yields} 4{alpha} type were discovered for the first time. They are treated as events of the coherent electromagnetic dissociation of an oxygen nucleus. Among all events, about 14% of the {sup 8}Be {yields} 2{alpha} decays proceed through the ground state of spin-parity 0{sup +}; an approximately the same fraction of such decays proceed through the first excited state of spin-parity 2{sup +}.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778812040102