## Abstract

The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich ^{132}Sn+^{124}Sn and neutron-deficient ^{108}Sn+^{112}Sn systems at 270 MeV/nucleon were investigated at RIKEN-RIBF. The data are compared with antisymmetrized molecular dynamics (AMD) calculations and the rapidity distributions can be reproduced after adjusting the in-medium nucleon-nucleon cross sections. The double ratios between the two reaction systems taken for the relative yields of deuteron to proton (d/p) and triton to proton (t/p) are further examined in the midrapidity domain, where the adjustments in the AMD calculations do not affect much on them. The d/p and t/p double ratios at midrapidity agree well with the ratio of the system neutron numbers and its squared value, respectively, and the rapidity dependence of these double ratios is consistent with a picture of partial mixing of colliding nuclei. By comparing with the AMD model which shows a strong symmetry energy dependence of the t/p double ratio, the experimental result in the midrapidity domain favors the calculation with a symmetry-energy slope parameter around L=46 MeV rather than L=108 MeV.

Original language | English |
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Article number | 136681 |

Journal | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |

Volume | 822 |

DOIs | |

Publication status | Published - 2021 Nov 10 |

### Bibliographical note

Publisher Copyright:© 2021 The Author(s)

## Keywords

- Antisymmetrized molecular dynamics
- Cluster productions
- Heavy radioactive isotope collisions
- Nuclear symmetry energy

## ASJC Scopus subject areas

- Nuclear and High Energy Physics