The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich 132Sn+124Sn and neutron-deficient 108Sn+112Sn 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.
Kaneko, M., et al. "Rapidity distributions of <em>Z</em> = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon." Physics Letters. B, vol. 822, Sep. 2021. https://doi.org/10.1016/j.physletb.2021.136681
Kaneko, M., Murakami, T., Isobe, T., Kurata-Nishimura, M., Ono, A., Ikeno, N., Barney, J., Cerizza, G., Estee, J., Jhang, G., Lee, J. W., Lynch, W. G., Santamaria, C., Tsang, C. Y., Tsang, M. B., Wang, R., Ahn, D. S., Atar, L., ... Zhang, Y. (2021). Rapidity distributions of <em>Z</em> = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon. Physics Letters. B, 822. https://doi.org/10.1016/j.physletb.2021.136681
Kaneko, M., Murakami, T., Isobe, T., et al., "Rapidity distributions of <em>Z</em> = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon," Physics Letters. B 822 (2021), https://doi.org/10.1016/j.physletb.2021.136681
@article{osti_1957890,
author = {Kaneko, M. and Murakami, T. and Isobe, T. and Kurata-Nishimura, M. and Ono, A. and Ikeno, N. and Barney, J. and Cerizza, G. and Estee, J. and Jhang, G. and others},
title = {Rapidity distributions of <em>Z</em> = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon},
annote = {The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich 132Sn+124Sn and neutron-deficient 108Sn+112Sn 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.},
doi = {10.1016/j.physletb.2021.136681},
url = {https://www.osti.gov/biblio/1957890},
journal = {Physics Letters. B},
issn = {ISSN 0370-2693},
volume = {822},
place = {United States},
publisher = {Elsevier},
year = {2021},
month = {09}}
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