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Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon

(SπRIT Collaboration) 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.; Aumann, T.; Baba, H.; Boretzky, K.; Brzychczyk, J.; Chiga, N.; Fukuda, N.; Gašparić, Igor; Hong, B.; Horvat, A.; Ichihara, T.; Ieki, K.; Inabe, N.; Kim, Y.J.; Kobayashi, T.; Kondo, Y.; Lasko, P.; Lee, H.S.; Leifels, Y.; Łukasik, J.; Manfredi, J.; McIntosh, A.B.; Morfouace, P.; Nakamura, T.; Nakatsuka, N.; Nishimura, S.; Olsen, R.; Otsu, H.; Pawłowski, P.; Pelczar, K.; Rossi, D.; Sakurai, H.; Sato, H.; Scheit, H.; Shane, R.; Shimizu, Y.; Simon, H.; Sumikama, T.; Suzuki, D.; Suzuki, H.; Takeda, H.; Tangwancharoen, S.; Togano, Y.; Törnqvist, H.; Xiao, Z.; Yennello, S.J.; Yurkon, J.; Zhang, Y. (2021) Rapidity distributions of Z = 1 isotopes and the nuclear symmetry energy from Sn+Sn collisions with radioactive beams at 270 MeV/nucleon. Physics letters. B, 822 . ISSN 0370-2693

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The rapidity distributions of hydrogen isotopes emitted from central collisions of neutron-rich Sn-132+Sn-124 and neutron-deficient Sn- 108+Sn-112 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.

Item Type: Article
Uncontrolled Keywords: Heavy radioactive isotope collisions ; Cluster productions ; Nuclear symmetry energy ; Antisymmetrized molecular dynamics
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Depositing User: Igor Gašparić
Date Deposited: 31 Mar 2023 13:23
DOI: 10.1016/j.physletb.2021.136681

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