Reactions <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>,</mo><mi> </mi><mi>n</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">H</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>2</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">He</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>4</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mo>(</mo><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>,</mo><mi> </mi><mi>n</mi><mo>)</mo><mrow><mmultiscripts><mrow><mi mathvariant="normal">H</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>3</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span> at Pion Energies of 100, 200, and 290 MeV

J. Källne; H. A. Thiessen; C. L. Morris; S. L. Verbeck; G. R. Burleson; M. J. Devereaux; J. S. McCarthy; J. E. Bolger; C. F. Moore; C. A. Goulding

doi:10.1103/PhysRevLett.40.378

Reactions ${}^{3}{He} (π^{-}, n) {}^{2}H$ and ${}^{4}{He} (π^{-}, n) {}^{3}H$ at Pion Energies of 100, 200, and 290 MeV

J. Källne, H. A. Thiessen, C. L. Morris, S. L. Verbeck, G. R. Burleson, M. J. Devereaux, J. S. McCarthy, J. E. Bolger, C. F. Moore, and C. A. Goulding

Phys. Rev. Lett. 40, 378 – Published 6 February 1978

Abstract

Differential cross sections for the ( $π^{-}, n$ ) reactions in ${}^{3}{He}$ and ${}^{4}{He}$ have been measured at energies of 100, 200, and 290 MeV. The angular distributions for ${}^{3}{He}$ and ${}^{4}{He}$ are different, with ${}^{4}{He}$ characterized by an oscillatory pattern with a dip at a fixed angle of ≃ 70°. The forward-angle cross sections show a simple dependence upon momentum transfer for both ${}^{3}{He}$ and ${}^{4}{He}$ . These results are discussed in the context of single-nucleon and multinucleon reaction diagrams.

Received 14 November 1977

DOI:https://doi.org/10.1103/PhysRevLett.40.378

Authors & Affiliations

J. Källne^*, H. A. Thiessen, and C. L. Morris

Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544

S. L. Verbeck, G. R. Burleson, and M. J. Devereaux

New Mexico State University, Las Cruces, New Mexico 88001

J. S. McCarthy

University of Virginia, Charlottesville, Virginia 22901

J. E. Bolger^† and C. F. Moore

University of Texas, Austin, Texas 78712

C. A. Goulding

Florida A&M University, Tallahassee, Florida 32306

^*Present address: University of Alberta-TRIUMF, University of British Columbia, Vancouver V6T 1W5, B. C., Canada.
^†Present address: Schweizerisches Institut für Nuklearforschung, Villigen, Switzerland.