Proton-$^{3}\mathrm{He}$ elastic scattering at low energies

Proton- ${}^{3}{He}$ elastic scattering at low energies

B. M. Fisher, C. R. Brune, H. J. Karwowski, D. S. Leonard, E. J. Ludwig, T. C. Black, M. Viviani, A. Kievsky, and S. Rosati

Phys. Rev. C 74, 034001 – Published 1 September 2006

Abstract

We present new accurate measurements of the differential cross section $σ (θ)$ and the proton analyzing power $A_{y}$ for proton- ${}^{3}{He}$ elastic scattering at various energies. A supersonic gas-jet target has been employed to obtain these low-energy cross-section measurements. The $σ (θ)$ distributions have been measured at $E_{p} = 0.99$ , 1.59, 2.24, 3.11, and 4.02 MeV. Full angular distributions of $A_{y}$ have been measured at $E_{p} = 1.60$ , 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 ( $3 N$ ) interactions. For the unpolarized cross section, the agreement between the theoretical calculation and data is good when a $3 N$ 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 “ $A_{y}$ puzzle” known for the past 20 years in nucleon-deuteron elastic scattering.

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Received 21 December 2005

DOI:https://doi.org/10.1103/PhysRevC.74.034001

Authors & Affiliations

B. M. Fisher^*, C. R. Brune^†, H. J. Karwowski, D. S. Leonard^‡, and E. J. Ludwig

Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3255, USA and Triangle Universities Nuclear Laboratory, Durham, North Carolina 27708-0308, USA

T. C. Black

Department of Physics and Physical Oceanography, University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA

M. Viviani, A. Kievsky, and S. Rosati

Istituto Nazionale di Fisica Nucleare, Sezione di Pisa; and Department of Physics, University of Pisa, I-56100 Pisa, Italy

^*Electronic address: brian.fisher@nist.gov; present address: Tulane University, New Orleans, LA 70118, USA; and National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
^†Present address: Department of Physics and Astronomy, Ohio University, Athens, OH 45701, USA.
^‡Present address: Department of Physics and Astronomy, University of Alabama, Tuscaloosa, AL 35487, USA.

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Vol. 74, Iss. 3 — September 2006

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Physical Review C

covering nuclear physics

Proton- ${}^{3}{He}$ elastic scattering at low energies

B. M. Fisher, C. R. Brune, H. J. Karwowski, D. S. Leonard, E. J. Ludwig, T. C. Black, M. Viviani, A. Kievsky, and S. Rosati

Phys. Rev. C 74, 034001 – Published 1 September 2006

Abstract

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Physical Review C

covering nuclear physics

Proton-He3 elastic scattering at low energies

B. M. Fisher, C. R. Brune, H. J. Karwowski, D. S. Leonard, E. J. Ludwig, T. C. Black, M. Viviani, A. Kievsky, and S. Rosati

Phys. Rev. C 74, 034001 – Published 1 September 2006

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Proton- ${}^{3}{He}$ elastic scattering at low energies