Electromagnetic dissociation of relativistic [sup 28]Si by nucleon emission

Thesis/Dissertation · Wed Jan 01 04:00:00 EST 1992

OSTI ID:6923874

Sonnadara, U J

A detailed study of the electromagnetic dissociation of [sup 28]Si by nucleon emission at E[sub lab]/A = 14.6 GeV/nucleon was carried out with [sup 28]Si measurements were made in the fixed target relativistic heavy ion experiment E814 operating at the Brookhaven National Laboratory. The E814 apparatus consists of detectors in the target area which measure the energy and charged multiplicity, and a forward spectrometer which measures the position, momentum and energy of the reaction fragments. The exclusive electromagnetic dissociation cross sections for decay channels having multiple nucleons in the final state have been measured with the aid of the E814 apparatus which enables the selection of events produced in pure electromagnetic interactions. The measured cross sections agree well with previous measurements obtained for the removal of a few nucleons with the E814 apparatus as well as with measurements on total charge removal cross section on the target charge Z[sub T] and the target mass A[sub T] confirms that for higher Z targets the excitation is largely electromagnetic. Direct measurements of the excitation energy for the electromagnetic dissociation of [sup 28]Si [r arrow] p + [sup 27]Al and [sup 28]Si [r arrow] n +[sup 27]Si have been obtained through a calculation of the invariant mass in kinematically reconstructed events. The excitation energy spectrum for all targets peak near the isovector gain dipole resonance in [sup 28]Si have been investigated with cross section measurements as well as with excitation energy reconstruction. Effects due to the surviving peripheral nuclear interactions and the contribution from double interactions on experimental observations are discussed.

• Research Organization: Pittsburgh Univ., PA (United States)
• OSTI ID: 6923874
• Country of Publication: United States
• Language: English

Related Subjects

663430* -- Nucleon-Induced Reactions & Scattering-- (1992-)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BASIC INTERACTIONS
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DISSOCIATION
ELECTROMAGNETIC INTERACTIONS
HADRON REACTIONS
HEAVY ION REACTIONS
INTERACTIONS
MULTIPLICITY
NUCLEAR REACTIONS
NUCLEON REACTIONS
SILICON 28 REACTIONS