skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Vector analyzing power of {pi}{sup +7}Li scattering in the region of the {delta}{sub 33} resonance

Abstract

Within Glauber diffraction theory, the vector analyzing power iT{sub 11} is calculated at three energies of positively charged pions, 134, 164, and 194 MeV, incident to {sup 7}Li nuclei. These energy values lie in the region of the {delta}{sub 33} resonance in {pi}{sup {+-}}N interaction, the resonance maximum being at 180 MeV. The calculation of iT{sub 11} was performed with several model {sup 7}Li wave functions, including the {alpha}t-cluster and shell-model ones. The properties of {pi}{sup +7}Li scattering are found to be sensitive to the structural features of the target nucleus. A comparison of the results of the calculations with experimental data shows that the wave functions in question and the potentials used to calculate them are quite appropriate.

Authors:
 [1];  [2];  [1];  [2]
  1. National Nuclear Center of the Republic of Kazakhstan, Institute of Nuclear Physics (Kazakhstan)
  2. Kazakh State University, Institute of Experimental and Theoretical Physics (Kazakhstan)
Publication Date:
OSTI Identifier:
21076090
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 69; Journal Issue: 4; Other Information: DOI: 10.1134/S1063778806040028; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; COMPARATIVE EVALUATIONS; COMPUTER CALCULATIONS; DIFFRACTION; INTERACTIONS; LITHIUM 7; MEV RANGE 100-1000; PION-NUCLEON INTERACTIONS; PIONS PLUS; POLARIZATION-ASYMMETRY RATIO; RESONANCE; SHELL MODELS; WAVE FUNCTIONS

Citation Formats

Ibraeva, E. T., Zhusupov, M. A., Zaykin, A. Yu., and Imambekov, O.. Vector analyzing power of {pi}{sup +7}Li scattering in the region of the {delta}{sub 33} resonance. United States: N. p., 2006. Web. doi:10.1134/S1063778806040028.
Ibraeva, E. T., Zhusupov, M. A., Zaykin, A. Yu., & Imambekov, O.. Vector analyzing power of {pi}{sup +7}Li scattering in the region of the {delta}{sub 33} resonance. United States. doi:10.1134/S1063778806040028.
Ibraeva, E. T., Zhusupov, M. A., Zaykin, A. Yu., and Imambekov, O.. Sat . "Vector analyzing power of {pi}{sup +7}Li scattering in the region of the {delta}{sub 33} resonance". United States. doi:10.1134/S1063778806040028.
@article{osti_21076090,
title = {Vector analyzing power of {pi}{sup +7}Li scattering in the region of the {delta}{sub 33} resonance},
author = {Ibraeva, E. T. and Zhusupov, M. A. and Zaykin, A. Yu. and Imambekov, O.},
abstractNote = {Within Glauber diffraction theory, the vector analyzing power iT{sub 11} is calculated at three energies of positively charged pions, 134, 164, and 194 MeV, incident to {sup 7}Li nuclei. These energy values lie in the region of the {delta}{sub 33} resonance in {pi}{sup {+-}}N interaction, the resonance maximum being at 180 MeV. The calculation of iT{sub 11} was performed with several model {sup 7}Li wave functions, including the {alpha}t-cluster and shell-model ones. The properties of {pi}{sup +7}Li scattering are found to be sensitive to the structural features of the target nucleus. A comparison of the results of the calculations with experimental data shows that the wave functions in question and the potentials used to calculate them are quite appropriate.},
doi = {10.1134/S1063778806040028},
journal = {Physics of Atomic Nuclei},
number = 4,
volume = 69,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
  • The inclusive vector analyzing power [ital iT][sub 11] of [pi][sup +][r arrow][sup 7]Li elastic scattering and inelastic scattering to the 0.47 MeV excited state was measured at several angles for [ital T][sub [pi]]=134, 164, and 194 MeV. The polarization effects were found to be small but nonzero, the trend of the data is well described by a coupled channels calculation. The results of the calculation are more sensitive to variations of the nuclear structure input than to variations of the reaction mechanism.
  • Differential cross sections and analyzing powers for the /sup 7/Li(p-arrow-right,..pi../sup +- /) reactions leading to discrete states of /sup 8/B and /sup 8/Li, as well as to the continuum, are presented at T/sub p/ = 280, 354, and 489 MeV. These results are compared with previously published results at 200 and 250 MeV. At fixed four-momentum transfers squared in the region 0.6>t>0.4 GeV/sup 2//c/sup 2/, the energy dependence of the (p,..pi../sup +/) and (p,..pi../sup -/) differential cross sections is quite similar, in sharp contrast to earlier results from the /sup 13/C(p,..pi../sup +- /) reactions. The observed variations in the (p,..pi../supmore » -/) energy dependence are presumed to reflect differences in the relative importance of resonant and nonresonant amplitudes in the (p,..pi../sup -/) reaction mechanism. The analyzing powers of the (p-arrow-right,..pi../sup -/) and (p-arrow-right,..pi../sup +/) reactions are qualitatively very similar except for a difference in sign.« less
  • Low-energy {sup 6}Li(d,{alpha}){sup 4}He and {sup 6}Li(d,p{sub 0}){sup 7}Li reactions are affected by the 2{sup +} resonance level of {sup 8}Be at E{sub x}{approx_equal}22.2 MeV. In this work, we present a new method to extract fractions of the 2{sup +} components of the reactions, which include the resonance, by using the tensor-analyzing powers, T{sub 2q}, of polarized deuterons. We measured T{sub 2q} for q=0,1,2 at the very low incident energy E{sub d}=90 keV and analyzed the data by the invariant amplitude method giving the 2{sup +} fractions as 0.90{+-}0.05 for {sup 6}Li(d,p) and 0.998{+-}0.003 for {sup 6}Li(d,{alpha}). For {sup 6}Li(d,p),more » it was comparable to the resonance fraction extracted from cross-section data, whereas for {sup 6}Li(d,{alpha}), the 2{sup +} fraction was much larger than the resonance fraction extracted from cross-section data. A part of the analyses was extended to higher energies up to 960 keV.« less
  • The vector analyzing power [ital iT][sub 11] of the reaction [pi][ital d][r arrow][ital pp] was measured at [ital T][sub [pi]]=350, 400, and 450 MeV. The results obtained at [ital T][sub [pi]]=350 MeV are in agreement with earlier measurements of [ital iT][sub 11] at 325 MeV. With increasing energies our results show a marked increase in the vector analyzing power up to a value close to its theoretical limit at [ital T][sub [pi]]=450 MeV ([radical][ital s] =2.40 GeV). In this energy region broad structure has been found in earlier measurements of [ital d][sigma]/[ital d][Omega] and [ital A][sub [ital y]0].