Elastic scattering of pions from {sup 3}H and {sup 3}He into the backwards hemisphere
- Physics Department, Catholic University of America, Washington, D.C. 20064 (United States)
- Center for Nuclear Studies, Department of Physics, The George Washington University, Washington, D.C. 20052 (United States)
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
- Burlington Engineering Labs, North Carolina State University, Raleigh, North Carolina 27612 (United States)
- Department of Physics, Abilene Christian University, Abilene, Texas 79699 (United States)
- Department of Physics, University of California, Los Angeles, California 90024 (United States)
- Los Alamos Technology Office at Rocky Flats, P.O. Box 4013, Mail Stop T130A, Golden, Colorado 80401 (United States)
- Rudjer Boskovic Institute, Zagreb, (Croatia)
- Weizmann Institute of Science, Rehovot 76100 (Israel)
We have measured differential cross sections for the elastic scattering of charged pions from {sup 3}H and {sup 3}He into the backward hemisphere. Near the peak of the delta resonance, at T{pi}=180 MeV, an angular distribution covering 114{degree} to 168{degree} in the laboratory extends our earlier measurements. At T{sub {pi}}=142, 180, 220, and 256 MeV, we have measured an excitation function at angles approaching 170{degree}. The cross sections for the reactions {sup 3}He({pi}{sup +},{pi}{sup +}){sup 3}He and {sup 3}H({pi}{sup {minus}},{pi}{sup {minus}}){sup 3}H show a rise at back angles which is not seen for {sup 3}He({pi}{sup {minus}},{pi}{sup {minus}}){sup 3}He and {sup 3}H({pi}{sup +},{pi}{sup +}){sup 3}H. There is a dip in the cross sections near 130{degree}, for {ital T}{sub {pi}}=180 MeV. We also present the values of the charge symmetric ratios {ital r}{sub 1} and {ital r}{sub 2}, which cross each other near 120{degree} and maintain this new relationship in the backwards hemisphere. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 244480
- Report Number(s):
- CONF-9405132--
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 334; ISSN 0094-243X; ISSN APCPCS
- Country of Publication:
- United States
- Language:
- English
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