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

Technical Report · Tue Dec 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/6610539· OSTI ID:6610539

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 beams interacting on [sup 208]Pb). [sup 120]Sn. [sup 64]C targets. The measurements 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 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 as well as with measurements on total charge removal cross sections from other experiments. The dependence of the integrated cross sections on the target charge Z[sub T] and the target mass AT 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 [yields] p+[sup 27]Al and [sup 28]Si [yields] 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 giant dipole resonance in [sup 28]Si. These distributions are well reproduced by combining the photon spectrum calculated using the Weizsaecker-Williams approximation with the experimental data on the photonuclear [sup 28]Si([sub [gamma],p])[sup 27]Al and [sup 28]Si([sub [gamma],n])[sup 27]Si. The possibilities of observing double giant dipole resonance excitations in [sup 28]Si have been investigated with cross section measurements as well as with excitation energy reconstruction.

• Research Organization: Pittsburgh Univ., PA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-87ER40363
• OSTI ID: 6610539
• Report Number(s): DOE/ER/40363-T3; ON: DE93008670
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALUMINIUM 27
ALUMINIUM 27 TARGET
ALUMINIUM ISOTOPES
BARYONS
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
COPPER 64 TARGET
COULOMB SCATTERING
CROSS SECTIONS
DATA
DISSOCIATION
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 100-1000
GIANT RESONANCE
HADRONS
HEAVY ION REACTIONS
INFORMATION
INTERACTIONS
ISOTOPES
LEAD 208 TARGET
LIGHT NUCLEI
NEUTRONS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PROTONS
RADIOISOTOPES
RELATIVISTIC RANGE
RESONANCE
SCATTERING
SECONDS LIVING RADIOISOTOPES
SILICON 27
SILICON 28 REACTIONS
SILICON ISOTOPES
STABLE ISOTOPES
TARGETS
TIN 120 TARGET