B. M. Fisher
University of North Carolina at Chapel Hill
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Physical Review C | 2006
B. M. Fisher; C. R. Brune; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; T. Black; M. Viviani; A. Kievsky; S. Rosati
We present new accurate measurements of the differential cross section {sigma}({theta}) and the proton analyzing power A{sub y} for proton-{sup 3}He elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The {sigma}({theta}) distributions have been measured at E{sub p}=0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of A{sub y} have been measured at E{sub p}=1.60, 2.25, 3.13, and 4.05 MeV. This set of high-precision data is compared to four-body variational calculations employing realistic nucleon-nucleon (NN) and three-nucleon (3N) interactions. For the unpolarized cross section, the agreement between the theoretical calculation and data is good when a 3N potential is used. The comparison between the calculated and measured proton analyzing powers reveals discrepancies of approximately 50% at the maximum of each distribution. This is analogous to the existing A{sub y} puzzle known for the past 20 years in nucleon-deuteron elastic scattering.
Physical Review C | 2006
B. M. Fisher; C. R. Brune; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; T. Black; M. Viviani; A. Kievsky; S. Rosati
We present new accurate measurements of the differential cross section {sigma}({theta}) and the proton analyzing power A{sub y} for proton-{sup 3}He elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The {sigma}({theta}) distributions have been measured at E{sub p}=0.99, 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of A{sub y} have been measured at E{sub p}=1.60, 2.25, 3.13, and 4.05 MeV. This set of high-precision data is compared to four-body variational calculations employing realistic nucleon-nucleon (NN) and three-nucleon (3N) interactions. For the unpolarized cross section, the agreement between the theoretical calculation and data is good when a 3N potential is used. The comparison between the calculated and measured proton analyzing powers reveals discrepancies of approximately 50% at the maximum of each distribution. This is analogous to the existing A{sub y} puzzle known for the past 20 years in nucleon-deuteron elastic scattering.
Physical Review C | 2006
B. M. Fisher; C. R. Brune; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; T. Black; M. Viviani; A. Kievsky; S. Rosati
Nuclear Physics | 2001
C. R. Brune; John T. Daly; Russell L. Detwiler; B. M. Fisher; W. H. Geist; J. Görres; H.J. Karwowski; R.W. Kavanagh; D. S. Leonard; P. Tischhauser; K.D. Veal; M. Wiescher
Physical Review C | 2004
B. Braizinha; C. R. Brune; A. M. Eiró; B. M. Fisher; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; Filipe Duarte Santos; I. J. Thompson
Nuclear Physics | 2001
M. H. Wood; C. R. Brune; B. M. Fisher; H. J. Karwowski; A. Kievsky; D. S. Leonard; E. J. Ludwig; S. Rosati; M. Viviani
Physical Review C | 2002
Kurtis A. Fletcher; C. R. Brune; B. M. Fisher; R. P. Fitzgerald; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; R. C. Runkle; M. H. Wood; W. H. Geist; K. D. Veal; Gerald M. Hale
Nuclear Physics | 2001
A. Kievsky; M. H. Wood; C. R. Brune; B. M. Fisher; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; S. Rosati; M. Viviani
Physical Review C | 2002
Kurtis A. Fletcher; C. R. Brune; B. M. Fisher; R. P. Fitzgerald; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; R. C. Runkle; M. H. Wood; W. H. Geist; K. D. Veal; Gerald M. Hale
Physical Review C | 2002
Kurtis A. Fletcher; C. R. Brune; B. M. Fisher; R. P. Fitzgerald; H. J. Karwowski; D. S. Leonard; E. J. Ludwig; R. C. Runkle; M. H. Wood; W. H. Geist; K. D. Veal; Gerald M. Hale
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