TY - JOUR
T1 - Influence of the neutron-skin effect on nuclear isobar collisions at energies available at the BNL Relativistic Heavy Ion Collider
AU - Hammelmann, Jan
AU - Soto-Ontoso, Alba
AU - Alvioli, Massimiliano
AU - Elfner, Hannah
AU - Strikman, Mark
N1 - Funding Information:
Acknowledgments. We would like to express our gratitude to Niklas Mueller, Vladimir Skokov, and Pritwish Tribedy for helpful discussions during the realization of this work. M.A. acknowledges a CINECA award under the ISCRA initiative for making high-performance computing resources available. H.E. and J.H. acknowledge support by the Helmholtz International Center for the Facility for Antiproton and Ion Research (HIC for FAIR) within the framework of the Landes-Offensive zur Entwicklung Wissenschaftlich-Oekonomischer Exzellenz (LOEWE) program from the State of Hesse. This project was further supported by the DAAD funded by BMBF with Project No. 57314610 and by the Deutsche Forschungsgemeinschaft (DFG) through Grant No. CRC-TR 211, Strong interaction matter under extreme conditions. A.S.O.'s work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-SC0012704, and by Laboratory Directed Research and Development (LDRD) funds from Brookhaven Science Associates. The research of M.S. was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award No. DE-FG02-93ER40771. Computing resources provided by the GOETHE-CSC are acknowledged as well.
Funding Information:
We would like to express our gratitude to Niklas Mueller, Vladimir Skokov, and Pritwish Tribedy for helpful discussions during the realization of this work. M.A. acknowledges a CINECA award under the ISCRA initiative for making high-performance computing resources available. H.E. and J.H. acknowledge support by the Helmholtz International Center for the Facility for Antiproton and Ion Research (HIC for FAIR) within the framework of the Landes-Offensive zur Entwicklung Wissenschaftlich-Oekonomischer Exzellenz (LOEWE) program from the State of Hesse. This project was further supported by the DAAD funded by BMBF with Project No. 57314610 and by the Deutsche Forschungsgemeinschaft (DFG) through Grant No. CRC-TR 211, Strong interaction matter under extreme conditions. A.S.O.'s work was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-SC0012704, and by Laboratory Directed Research and Development (LDRD) funds from Brookhaven Science Associates. The research of M.S. was supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Award No. DE-FG02-93ER40771. Computing resources provided by the GOETHE-CSC are acknowledged as well.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/6
Y1 - 2020/6
N2 - The unambiguous observation of a chiral magnetic effect (CME)-driven charge separation is the core aim of the isobar program at the Relativistic Heavy Ion Collider (RHIC), consisting of Zr4096+Zr4096 and Ru4496+Ru4496 collisions at sNN=200 GeV. We quantify the role of the spatial distributions of the nucleons in the isobars on both eccentricity and magnetic field strength within a relativistic hadronic transport approach (simulating many accelerated strongly interacting hadrons, SMASH). In particular, we introduce isospin-dependent nucleon-nucleon spatial correlations in the geometric description of both nuclei, deformation for Ru4496 and the so-called neutron skin effect for the neutron-rich isobar, i.e., Zr4096. The main result of this study is a reduction of the magnetic field strength difference between Ru4496+Ru4496 and Zr4096+Zr4096 by a factor of 2, from 10% to 5% in peripheral collisions when the neutron-skin effect is included. Further, we find an increase of the eccentricity ratio between the isobars by up to 10% in ultracentral collisions as due to the deformation of Ru4496 while neither the neutron skin effect nor the nucleon-nucleon correlations result into a significant modification of this observable with respect to the traditional Woods-Saxon modeling. Our results suggest a significantly smaller CME signal to background ratio for the experimental charge separation measurement in peripheral collisions with the isobar systems than previously expected.
AB - The unambiguous observation of a chiral magnetic effect (CME)-driven charge separation is the core aim of the isobar program at the Relativistic Heavy Ion Collider (RHIC), consisting of Zr4096+Zr4096 and Ru4496+Ru4496 collisions at sNN=200 GeV. We quantify the role of the spatial distributions of the nucleons in the isobars on both eccentricity and magnetic field strength within a relativistic hadronic transport approach (simulating many accelerated strongly interacting hadrons, SMASH). In particular, we introduce isospin-dependent nucleon-nucleon spatial correlations in the geometric description of both nuclei, deformation for Ru4496 and the so-called neutron skin effect for the neutron-rich isobar, i.e., Zr4096. The main result of this study is a reduction of the magnetic field strength difference between Ru4496+Ru4496 and Zr4096+Zr4096 by a factor of 2, from 10% to 5% in peripheral collisions when the neutron-skin effect is included. Further, we find an increase of the eccentricity ratio between the isobars by up to 10% in ultracentral collisions as due to the deformation of Ru4496 while neither the neutron skin effect nor the nucleon-nucleon correlations result into a significant modification of this observable with respect to the traditional Woods-Saxon modeling. Our results suggest a significantly smaller CME signal to background ratio for the experimental charge separation measurement in peripheral collisions with the isobar systems than previously expected.
UR - http://www.scopus.com/inward/record.url?scp=85087694865&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85087694865&partnerID=8YFLogxK
U2 - 10.1103/PhysRevC.101.061901
DO - 10.1103/PhysRevC.101.061901
M3 - Article
AN - SCOPUS:85087694865
SN - 2469-9985
VL - 101
JO - Physical Review C
JF - Physical Review C
IS - 6
M1 - 061901
ER -