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Title: Structure of /sup 13/C studied by pion scattering near the (3,3) resonance

Abstract

Good resolution (..pi../sup +/,..pi../sup +/') and (..pi../sup -/,..pi../sup -/') data were obtained for many states in /sup 13/C using the Energetic Pion Channel and Spectrometer at the Los Alamos Meson Physics Facility. Differential cross sections were measured for angles between 20/sup 0/ and 105/sup 0/ at an incident pion energy of 162 MeV for the elastic scattering as well as for states at excitation energies of 3.09, 3.68, 3.85, 7.55, 8.86, 9.5, 11.82, 16.05, 17.92, 21.37, and 21.6 MeV. Excitation functions were measured at momentum transfers of q = 1.1 h fm /sup -1/ and q = 1.4 h fm/sup -1/, for energies between 100 and 300 MeV. A sigma(..pi../sup -/)/sigma(..pi../sup +/) ratio of 9:1 was observed for the first time, indicating a pure neutron particle-hole excitation of a high spin state (J/sup ..pi../ = 9/2/sup +/). Strikingly different energy dependences were found for ..delta..S = 0 and ..delta..S = 1 transitions. Data for all states were compared with the microscopic model calculations of Lee and Kurath. Very good agreement was found between experiment and theory for the strongly excited states and the 9/2/sup +/ state at 9.5 MeV, in sharp contrast to the disagreement for weak transitions. The excitationmore » function data and comparisons with the microscopic model calculations were used to identify the states at 16.05, 17.92, 21.37, and 21.6 MeV as either 7/2/sup +/ or 9/2/sup +/ states. The elastic scattering data were analyzed with an optical modeland the results were found to be consistent with neutron and proton distributions having equal rms radii. The optical potentials generated were used in a collective model analysis of the 3/2/sup -/ (3.68 MeV) and 5/2/sup -/ (7.55 MeV) states. The reduced transition probabilities (B(E2)) derived from the proton parts of the transition strength are in agreement with those determined from electromagnetic measurements.« less

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
5972724
Report Number(s):
LA-8916-T
ON: DE82002991; TRN: 82-001236
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CARBON 13; ENERGY LEVELS; CARBON 13 TARGET; PION MINUS REACTIONS; PION PLUS REACTIONS; INELASTIC SCATTERING; COLLECTIVE MODEL; DIFFERENTIAL CROSS SECTIONS; E2-TRANSITIONS; ELASTIC SCATTERING; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; HIGH SPIN STATES; MEV RANGE 100-1000; STRENGTH FUNCTIONS; CARBON ISOTOPES; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DATA; ENERGY RANGE; ENERGY-LEVEL TRANSITIONS; EVEN-ODD NUCLEI; FUNCTIONS; HADRON REACTIONS; INFORMATION; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MESON REACTIONS; MEV RANGE; MULTIPOLE TRANSITIONS; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUMERICAL DATA; PION REACTIONS; SCATTERING; STABLE ISOTOPES; TARGETS; 651323* - Nuclear Properties & Reactions, A=6-19, Experimental- Energy Levels & Transitions- (-1987); 651325 - Nuclear Properties & Reactions, A=6-19, Experimental- Nuclear Reactions & Scattering- (-1987)

Citation Formats

Seestrom-Morris, S J. Structure of /sup 13/C studied by pion scattering near the (3,3) resonance. United States: N. p., 1981. Web. doi:10.2172/5972724.
Seestrom-Morris, S J. Structure of /sup 13/C studied by pion scattering near the (3,3) resonance. United States. https://doi.org/10.2172/5972724
Seestrom-Morris, S J. 1981. "Structure of /sup 13/C studied by pion scattering near the (3,3) resonance". United States. https://doi.org/10.2172/5972724. https://www.osti.gov/servlets/purl/5972724.
@article{osti_5972724,
title = {Structure of /sup 13/C studied by pion scattering near the (3,3) resonance},
author = {Seestrom-Morris, S J},
abstractNote = {Good resolution (..pi../sup +/,..pi../sup +/') and (..pi../sup -/,..pi../sup -/') data were obtained for many states in /sup 13/C using the Energetic Pion Channel and Spectrometer at the Los Alamos Meson Physics Facility. Differential cross sections were measured for angles between 20/sup 0/ and 105/sup 0/ at an incident pion energy of 162 MeV for the elastic scattering as well as for states at excitation energies of 3.09, 3.68, 3.85, 7.55, 8.86, 9.5, 11.82, 16.05, 17.92, 21.37, and 21.6 MeV. Excitation functions were measured at momentum transfers of q = 1.1 h fm /sup -1/ and q = 1.4 h fm/sup -1/, for energies between 100 and 300 MeV. A sigma(..pi../sup -/)/sigma(..pi../sup +/) ratio of 9:1 was observed for the first time, indicating a pure neutron particle-hole excitation of a high spin state (J/sup ..pi../ = 9/2/sup +/). Strikingly different energy dependences were found for ..delta..S = 0 and ..delta..S = 1 transitions. Data for all states were compared with the microscopic model calculations of Lee and Kurath. Very good agreement was found between experiment and theory for the strongly excited states and the 9/2/sup +/ state at 9.5 MeV, in sharp contrast to the disagreement for weak transitions. The excitation function data and comparisons with the microscopic model calculations were used to identify the states at 16.05, 17.92, 21.37, and 21.6 MeV as either 7/2/sup +/ or 9/2/sup +/ states. The elastic scattering data were analyzed with an optical modeland the results were found to be consistent with neutron and proton distributions having equal rms radii. The optical potentials generated were used in a collective model analysis of the 3/2/sup -/ (3.68 MeV) and 5/2/sup -/ (7.55 MeV) states. The reduced transition probabilities (B(E2)) derived from the proton parts of the transition strength are in agreement with those determined from electromagnetic measurements.},
doi = {10.2172/5972724},
url = {https://www.osti.gov/biblio/5972724}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 1981},
month = {Tue Sep 01 00:00:00 EDT 1981}
}