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Title: Gamow-Teller matrix elements from the /sup 11/B(p,n)/sup 11/C reaction at E/sub p/roughly-equal26 MeV

Abstract

New data are presented for the /sup 11/B(p,n)/sup 11/C reaction taken at 1 MeV intervals for proton bombarding energies in the E/sub p/ = 16--26 MeV range. In the experiment, final states in /sup 11/C up to E/sub x/approx. =10 MeV were clearly identified and differential cross sections were extracted for the first four levels in /sup 11/C. The E/sub p/ = 26 MeV data are examined in microscopic distorted-wave approximation calculations using the wave functions of Cohen and Kurath to describe the states in /sup 11/B and /sup 11/C and using the G matrix interaction of Bertsch et al. for the effective nucleon-nucleon interaction. Gamow-Teller matrix elements for transitions to excited states in /sup 11/C are extracted on the basis of these calculations, thus extending the information on Gamow-Teller matrix elements in the mass 11 systems beyond the ground state matrix element known from ..beta.. decay. Throughout, the results are contrasted with existing information from electromagnetic studies of /sup 11/B. It is concluded that the Cohen-Kurath model places too much Gamow-Teller strength in the low lying states of the mass 11 systems and not enough strength at higher excitation energies. In addition, this model underestimates the net contribution tomore » M1 matrix elements from the isoscalar spin and current and isovector current parts of the M1 operator.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory, Livermore, California 94550
OSTI Identifier:
5938939
Resource Type:
Journal Article
Journal Name:
Phys. Rev. C; (United States)
Additional Journal Information:
Journal Volume: 31:5
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BORON 11 TARGET; PROTON REACTIONS; CARBON 11; ENERGY LEVELS; CHARGE-EXCHANGE REACTIONS; DIFFERENTIAL CROSS SECTIONS; DISTORTED WAVE THEORY; EXPERIMENTAL DATA; GAMOW-TELLER RULES; MATRIX ELEMENTS; MEV RANGE 10-100; NEUTRONS; NUCLEON-NUCLEON INTERACTIONS; SHELL MODELS; SPIN; ANGULAR MOMENTUM; BARYON REACTIONS; BARYON-BARYON INTERACTIONS; BARYONS; BETA DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CARBON ISOTOPES; CHARGED-PARTICLE REACTIONS; CROSS SECTIONS; DATA; ELEMENTARY PARTICLES; ENERGY RANGE; EVEN-ODD NUCLEI; FERMIONS; HADRON REACTIONS; HADRON-HADRON INTERACTIONS; HADRONS; INFORMATION; INTERACTIONS; ISOTOPES; LIGHT NUCLEI; MATHEMATICAL MODELS; MEV RANGE; MINUTES LIVING RADIOISOTOPES; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUCLEON REACTIONS; NUCLEONS; NUMERICAL DATA; PARTICLE INTERACTIONS; PARTICLE PROPERTIES; RADIOISOTOPES; TARGETS; 651325* - Nuclear Properties & Reactions, A=6-19, Experimental- Nuclear Reactions & Scattering- (-1987); 651323 - Nuclear Properties & Reactions, A=6-19, Experimental- Energy Levels & Transitions- (-1987)

Citation Formats

Grimes, S M, Anderson, J D, Davis, J C, Howell, R H, Wong, C, Carpenter, A W, Carr, J A, and Petrovich, F. Gamow-Teller matrix elements from the /sup 11/B(p,n)/sup 11/C reaction at E/sub p/roughly-equal26 MeV. United States: N. p., 1985. Web. doi:10.1103/PhysRevC.31.1679.
Grimes, S M, Anderson, J D, Davis, J C, Howell, R H, Wong, C, Carpenter, A W, Carr, J A, & Petrovich, F. Gamow-Teller matrix elements from the /sup 11/B(p,n)/sup 11/C reaction at E/sub p/roughly-equal26 MeV. United States. https://doi.org/10.1103/PhysRevC.31.1679
Grimes, S M, Anderson, J D, Davis, J C, Howell, R H, Wong, C, Carpenter, A W, Carr, J A, and Petrovich, F. 1985. "Gamow-Teller matrix elements from the /sup 11/B(p,n)/sup 11/C reaction at E/sub p/roughly-equal26 MeV". United States. https://doi.org/10.1103/PhysRevC.31.1679.
@article{osti_5938939,
title = {Gamow-Teller matrix elements from the /sup 11/B(p,n)/sup 11/C reaction at E/sub p/roughly-equal26 MeV},
author = {Grimes, S M and Anderson, J D and Davis, J C and Howell, R H and Wong, C and Carpenter, A W and Carr, J A and Petrovich, F},
abstractNote = {New data are presented for the /sup 11/B(p,n)/sup 11/C reaction taken at 1 MeV intervals for proton bombarding energies in the E/sub p/ = 16--26 MeV range. In the experiment, final states in /sup 11/C up to E/sub x/approx. =10 MeV were clearly identified and differential cross sections were extracted for the first four levels in /sup 11/C. The E/sub p/ = 26 MeV data are examined in microscopic distorted-wave approximation calculations using the wave functions of Cohen and Kurath to describe the states in /sup 11/B and /sup 11/C and using the G matrix interaction of Bertsch et al. for the effective nucleon-nucleon interaction. Gamow-Teller matrix elements for transitions to excited states in /sup 11/C are extracted on the basis of these calculations, thus extending the information on Gamow-Teller matrix elements in the mass 11 systems beyond the ground state matrix element known from ..beta.. decay. Throughout, the results are contrasted with existing information from electromagnetic studies of /sup 11/B. It is concluded that the Cohen-Kurath model places too much Gamow-Teller strength in the low lying states of the mass 11 systems and not enough strength at higher excitation energies. In addition, this model underestimates the net contribution to M1 matrix elements from the isoscalar spin and current and isovector current parts of the M1 operator.},
doi = {10.1103/PhysRevC.31.1679},
url = {https://www.osti.gov/biblio/5938939}, journal = {Phys. Rev. C; (United States)},
number = ,
volume = 31:5,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1985},
month = {Wed May 01 00:00:00 EDT 1985}
}