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Title: Multiproton final states in positive pion absorption below the {delta}(1232) resonance

Abstract

Inclusive cross sections for positive pion absorption leading to final states including two or more protons have been measured with a large solid angle detector for incident pion energies from 30 to 135 MeV for targets with A=2-208. The mass dependences for the inclusive ({pi}{sup +},2p), ({pi}{sup +},3p), and total absorption cross sections for multiproton final states were found to be proportional to A{sup n} with n{approx_equal}0.5. These cross sections also were observed to have an energy dependence at energies below 150 MeV reflective of the importance of the {delta}(1232) resonance, similar to that observed for {pi}d{yields}pp. The inclusive cross sections for ({pi}{sup +},4p) were found to be less than 10 mb for all targets at all energies. Estimates were also obtained for cross sections for pion absorption leading to 2p1n and 3p1n final states. Quasideuteron absorption contributions increase slowly with A, and the energy dependence of those contributions mirrors that for {pi}d{yields}pp. The data obtained here for multiproton final states indicate that a significant fraction of absorption events, increasing with A, most likely arises from final states containing fewer than two protons. (c) 2000 The American Physical Society.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4]
  1. Arizona State University, Tempe, Arizona 85287-1504 (United States)
  2. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  3. Rutgers University, Piscataway, New Jersey 08855 (United States)
  4. Rutgers University, Piscataway, New Jersey 08855 (United States) (and others)
Publication Date:
OSTI Identifier:
20216350
Resource Type:
Journal Article
Journal Name:
Physical Review. C, Nuclear Physics
Additional Journal Information:
Journal Volume: 61; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0556-2813
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; MUON REACTIONS; MUONS PLUS; PROTONS; DELTA-1232 BARYONS; CROSS SECTIONS; EXPERIMENTAL DATA

Citation Formats

Giannelli, R. A., Ritchie, B. G., Applegate, J. M., Beck, E., Beck, J., Vanderpool, A. O., Morris, C. L., Rahwool-Sullivan, M., Jones, M. K., and Ransome, R. D. Multiproton final states in positive pion absorption below the {delta}(1232) resonance. United States: N. p., 2000. Web. doi:10.1103/PhysRevC.61.054615.
Giannelli, R. A., Ritchie, B. G., Applegate, J. M., Beck, E., Beck, J., Vanderpool, A. O., Morris, C. L., Rahwool-Sullivan, M., Jones, M. K., & Ransome, R. D. Multiproton final states in positive pion absorption below the {delta}(1232) resonance. United States. doi:10.1103/PhysRevC.61.054615.
Giannelli, R. A., Ritchie, B. G., Applegate, J. M., Beck, E., Beck, J., Vanderpool, A. O., Morris, C. L., Rahwool-Sullivan, M., Jones, M. K., and Ransome, R. D. Mon . "Multiproton final states in positive pion absorption below the {delta}(1232) resonance". United States. doi:10.1103/PhysRevC.61.054615.
@article{osti_20216350,
title = {Multiproton final states in positive pion absorption below the {delta}(1232) resonance},
author = {Giannelli, R. A. and Ritchie, B. G. and Applegate, J. M. and Beck, E. and Beck, J. and Vanderpool, A. O. and Morris, C. L. and Rahwool-Sullivan, M. and Jones, M. K. and Ransome, R. D.},
abstractNote = {Inclusive cross sections for positive pion absorption leading to final states including two or more protons have been measured with a large solid angle detector for incident pion energies from 30 to 135 MeV for targets with A=2-208. The mass dependences for the inclusive ({pi}{sup +},2p), ({pi}{sup +},3p), and total absorption cross sections for multiproton final states were found to be proportional to A{sup n} with n{approx_equal}0.5. These cross sections also were observed to have an energy dependence at energies below 150 MeV reflective of the importance of the {delta}(1232) resonance, similar to that observed for {pi}d{yields}pp. The inclusive cross sections for ({pi}{sup +},4p) were found to be less than 10 mb for all targets at all energies. Estimates were also obtained for cross sections for pion absorption leading to 2p1n and 3p1n final states. Quasideuteron absorption contributions increase slowly with A, and the energy dependence of those contributions mirrors that for {pi}d{yields}pp. The data obtained here for multiproton final states indicate that a significant fraction of absorption events, increasing with A, most likely arises from final states containing fewer than two protons. (c) 2000 The American Physical Society.},
doi = {10.1103/PhysRevC.61.054615},
journal = {Physical Review. C, Nuclear Physics},
issn = {0556-2813},
number = 5,
volume = 61,
place = {United States},
year = {2000},
month = {5}
}