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Title: ANTIPROTON-NUCLEON CROSS SECTIONS FROM 0.5 TO 1.0 Bev

Abstract

Antiproton-production and nucleon-interaction cross sections were investigated for antiprotons in the energy range 0.5 to 1.0 Bev. The antiprotons were distinguished from other particles produced at the Bevatron by a system of scintillation- and velocity-selecting Cherenkov counters. The excitation function and momentum distribution were recorded for antiproton production in carbon and compared with statistical model expectations. The antiprotons were directed by a system of bending and focusing magnets to a liquid hydrogen target. An array of plastic scintillation counters, which almost completely surrounded the hydrogen target, was used to determine the p-p total, elastic, inelastic, and charge-exchange cross sections. Near 500 Mev the total d-p cross section was about 120 mb, and it slowly decreased to 100 mb near 1 Bev. The inelastic cross section, which is principally due to the annihilation process, represented nearly 2/3 of the total cross section. The elastic scattering distribution was highly peaked in the forward direction and could be fitted by an optical model. The total and partial cross sections were also determined for the collisions of antiprotons with deuterons. The p-d total and inelastic cross sections were found to be approximately 1.8 times the p-p cross sections. Corrections were made for the shieldingmore » of nucleons within the deuteron in order to ascertaln the p-n interaction. The results indicate that the p-p and p-n cross sections are very nearly equal in this energy region, and that they satisfy the inequalities required by charge independence. (auth)« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
California Univ., Berkeley, CA (US). Lawrence Radiation Lab.
OSTI Identifier:
4760477
Report Number(s):
UCRL-9288(Rev.)
NSA Number:
NSA-17-006959
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-63
Country of Publication:
United States
Language:
English
Subject:
PHYSICS; COLLECTIVE MODEL; CROSS SECTIONS; ELASTIC SCATTERING; EXCITATION; EXCITATION FUNCTION; INELASTIC SCATTERING; NUCLEAR MODELS; OPTICAL MODEL; SCATTERING; STATISTICS

Citation Formats

Elioff, T, Agnew, L, Chamberlain, O, Steiner, H M, Wiegand, C, and Ypsilantis, T. ANTIPROTON-NUCLEON CROSS SECTIONS FROM 0.5 TO 1.0 Bev. United States: N. p., 1961. Web. doi:10.2172/4760477.
Elioff, T, Agnew, L, Chamberlain, O, Steiner, H M, Wiegand, C, & Ypsilantis, T. ANTIPROTON-NUCLEON CROSS SECTIONS FROM 0.5 TO 1.0 Bev. United States. doi:10.2172/4760477.
Elioff, T, Agnew, L, Chamberlain, O, Steiner, H M, Wiegand, C, and Ypsilantis, T. Tue . "ANTIPROTON-NUCLEON CROSS SECTIONS FROM 0.5 TO 1.0 Bev". United States. doi:10.2172/4760477. https://www.osti.gov/servlets/purl/4760477.
@article{osti_4760477,
title = {ANTIPROTON-NUCLEON CROSS SECTIONS FROM 0.5 TO 1.0 Bev},
author = {Elioff, T and Agnew, L and Chamberlain, O and Steiner, H M and Wiegand, C and Ypsilantis, T},
abstractNote = {Antiproton-production and nucleon-interaction cross sections were investigated for antiprotons in the energy range 0.5 to 1.0 Bev. The antiprotons were distinguished from other particles produced at the Bevatron by a system of scintillation- and velocity-selecting Cherenkov counters. The excitation function and momentum distribution were recorded for antiproton production in carbon and compared with statistical model expectations. The antiprotons were directed by a system of bending and focusing magnets to a liquid hydrogen target. An array of plastic scintillation counters, which almost completely surrounded the hydrogen target, was used to determine the p-p total, elastic, inelastic, and charge-exchange cross sections. Near 500 Mev the total d-p cross section was about 120 mb, and it slowly decreased to 100 mb near 1 Bev. The inelastic cross section, which is principally due to the annihilation process, represented nearly 2/3 of the total cross section. The elastic scattering distribution was highly peaked in the forward direction and could be fitted by an optical model. The total and partial cross sections were also determined for the collisions of antiprotons with deuterons. The p-d total and inelastic cross sections were found to be approximately 1.8 times the p-p cross sections. Corrections were made for the shielding of nucleons within the deuteron in order to ascertaln the p-n interaction. The results indicate that the p-p and p-n cross sections are very nearly equal in this energy region, and that they satisfy the inequalities required by charge independence. (auth)},
doi = {10.2172/4760477},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1961},
month = {12}
}