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Efimov States From Triple α Resonances

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Published: Apr 1, 2019
DOI: https://doi.org/10.12681/hnps.1794
Keywords:
Hoyle state Efimov state 12C excited state few body system Heavy ion reactions
S. Zhang
College of Physics and Electronics information, Inner Mongolia University for Nationalities
M. Huang
College of Physics and Electronics information, Inner Mongolia University for Nationalities
H. Zheng
School of Physics and Information Technology, Shaanxi Normal University
G. Zhang
Shanghai Institute Applied Physics, Chinese Academy of Sciences
Z. Kohley
Cyclotron Institute, Texas A&M University Chemistry Department, Texas A&M University
Y. G. Ma
Shanghai Institute Applied Physics, Chinese Academy of Sciences
S. J. Yennello
Cyclotron Institute, Texas A&M University Chemistry Department, Texas A&M University
A. Bonasera
Cyclotron Institute, Texas A&M University Laboratori Nazionali del Sud, INFN
Abstract

The Efimov trimers in excited 12C nuclei, which no observation exists yet, are discussed by means of analyzing the experimental data of 70(64)Zn(64Ni) +70(64)Zn(64Ni )reactions at beam energy of E/A=35 MeV/nucleon. In heavy ion collisions, the αs interact with each other and can form complex systems such as 8Be and 12C. For the 3α systems, multi resonance processes give rise to excited levels of 12C. The interaction between any two of the 3α particles provides events with one, two or three 8Be. Their interfering levels are clearly seen in the minimum relative energy distributions. Events of three couple αrelative energies consistent with the ground state of 8Be are observed with the decreasing of the instrumental error at the reconstructed 7.458 MeV excitation energy of 12C, which was suggested as the (Thomas) Efimov state.

Article Details
  • Section
  • Oral contributions
Author Biography
G. Zhang, Shanghai Institute Applied Physics, Chinese Academy of Sciences

 

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