Target effects in isobaric yield ratio differences between projectile fragmentation reactions

Chun-Wang Ma (马春旺), Yan-Li Zhang (张艳丽), Chun-Yuan Qiao (乔春源), and Shan-Shan Wang (王闪闪)
Phys. Rev. C 91, 014615 – Published 28 January 2015

Abstract

Background: The isobaric yield ratio difference (IBD) between reactions is know to be sensitive to the density difference between projectiles in heavy-ion collisions around the Fermi energy.

Purpose: The target effects in the isobaric yield ratio (IYR) and the IBD results have been studied.

Methods: The amount of isotopes in the 140A MeV 48,40Ca+181Ta/9Be and 58,64Ni+181Ta/9Be reactions have been previously measured with high accuracy. The IYR and IBD results have been obtained from these reactions to study the effects of the light Be9 and heavy Ta181 targets. A ratio (rΔμ) between the IBD results for the reactions with Ta and Be targets is defined to quantitatively show the target dependence of the IBD results. Results The IYRs for reactions with symmetric projectiles are more easily affected than those for reactions with neutron-rich projectiles. The IBD results are suppressed by using the Ta181 target to different degrees.

Conclusions: The IYR and IBD results are influenced by the target used. The IBD for the I=1 isobaric chain is suggested as a probe to study the difference between the neutron and proton densities of the reaction systems.

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  • Received 10 October 2014
  • Revised 27 November 2014

DOI:https://doi.org/10.1103/PhysRevC.91.014615

©2015 American Physical Society

Authors & Affiliations

Chun-Wang Ma (马春旺)*, Yan-Li Zhang (张艳丽), Chun-Yuan Qiao (乔春源), and Shan-Shan Wang (王闪闪)

  • Institute of Particle and Nuclear Physics, Henan Normal University, Xinxiang 453007, China

  • *Corresponding author: machunwang@126.com

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Vol. 91, Iss. 1 — January 2015

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