Pion scattering to 8 sup minus stretched states in sup 60 Ni

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5120420

Clausen, B L

Using the Energetic Pion Channel and Spectrometer (EPICS) at the Los Alamos Meson Physics Facility (LAMPF), differential cross sections for pion scattering were measured for ten previously known J{sup {pi}} = 8{sup {minus}} stretched states in {sup 60}Ni. A possible new pure isoscalar stretched state was also found. The data were taken near the {Delta}{sub 3,3}-resonance using 162 MeV incident pions and scattering angles of 65{degree}, 80{degree}, and 90{degree} for {pi}{sup +} and 65{degree} and 80{degree} for {pi}{sup {minus}}. For {sup 60}Ni the isoscalar ({Delta}T = 0) strength was found to be much smaller than the isovector ({Delta} T = 1) strength, as has been found previously in other nuclei, and the isovector strength was found to be only 25% of that expected from a simple sum rule. The isoscalar and isovector amplitudes of each stretched transition were found by comparing the pion scattering cross sections with previous electron scattering data. The analysis of the {sup 60}Ni data found that the use of Woods-Saxon (WS) wave functions in the theoretical calculations gave much better agreement with data than the use of the usual harmonic oscillator (HO) wave functions. This analysis using WS wave functions was extended to five other nuclei ({sup 12}C, {sup 14}C, {sup 16}O, {sup 28}Si, and {sup 54}FE) on which both pion scattering and electron scattering have been done. A significant improvement is arriving at a normalization factor close to unity was found when WS wave functions were consistently used for analyzing both pion and electron inelastic scattering data. This is the first time that a consistent analysis in several nuclei has been done using WS wave functions.

• Research Organization: Colorado Univ., Boulder, CO (USA)
• OSTI ID: 5120420
• Country of Publication: United States
• Language: English

Related Subjects

651620* -- Nuclear Properties & Reactions
A=59-89
Experimental
653003 -- Nuclear Theory-- Nuclear Reactions & Scattering
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
CARBON ISOTOPES
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
DATA
DIFFERENTIAL CROSS SECTIONS
ENERGY RANGE
EVEN-EVEN NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON 54
IRON ISOTOPES
ISOTOPES
LAMPF LINAC
LIGHT NUCLEI
LINEAR ACCELERATORS
MEASURING INSTRUMENTS
MEASURING METHODS
MESON FACTORIES
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NICKEL 60
NICKEL ISOTOPES
NUCLEAR REACTIONS
NUCLEI
NUMERICAL DATA
OXYGEN 16
OXYGEN ISOTOPES
PION REACTIONS
SILICON 28
SILICON ISOTOPES
STABLE ISOTOPES