Determination of fusion barrier distributions from quasielastic scattering cross sections towards superheavy nuclei synthesis

Taiki Tanaka, Yoshihiro Narikiyo, Kosuke Morita, Kunihiro Fujita, Daiya Kaji, Kouji Morimoto, Sayaka Yamaki, Yasuo Wakabayashi, Kengo Tanaka, Mirei Takeyama, Akira Yoneda, Hiromitsu Haba, Yukiko Komori, Shinya Yanou, Benoît Jean Paul Gall, Zouhair Asfari, Hugo Faure, Hiroo Hasebe, Minghui Huang, Jumpei KanayaMasashi Murakami, Atsushi Yoshida, Takayuki Yamaguchi, Fuyuki Tokanai, Tomomi Yoshida, Shoya Yamamoto, Yuki Yamano, Kenyu Watanabe, Satoshi Ishizawa, Masato Asai, Ryuji Aono, Shin Ichi Goto, Kenji Katori, Kouichi Hagino

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

In order to study the nucleus-nucleus interactions for syntheses of superheavy nuclei, we measured excitation functions for the quasielastic scattering of 48Ca+208Pb, 50Ti+208Pb, and 48Ca+248Cm using the gas-filled-type recoil ion separator GARIS. The quasielastic scattering events were clearly separated from deep-inelastic events by using GARIS and its focal plan detectors, except for high-incident-energy points. The quasielastic barrier distributions were successfully extracted for these systems, and compared with coupled-channels calculations. The results of the calculations indicate that vibrational and rotational excitations of the colliding nuclei, as well as neutron transfers before contact, strongly affect the structure of the barrier distribution. For the reactions of 48Ca+208Pb and 50Ti+208Pb, a local maximum of the barrier distribution occurred at the same energy as the peak of the 2n evaporation cross section of the system. On the other hand, for the hot fusion reaction of 48Ca+248Cm, the 4n evaporation cross section of the system peaks at energies well above the maximum of the barrier distribution. This may be attributed to the deformation of the target nucleus. We argue that these findings can be utilized to locate the optimal energy for future searches for undiscovered superheavy nuclei.

Original languageEnglish
Article number014201
Journaljournal of the physical society of japan
Volume87
Issue number1
DOIs
Publication statusPublished - Jan 1 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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