Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session LB: Nuclear Reactions 1
9:00 AM–11:30 AM,
Saturday, October 27, 2018
Hilton
Room: Kohala 1
Chair: A.B. Balantekin, University of Wisconsin
Abstract ID: BAPS.2018.HAW.LB.4
Abstract: LB.00004 : Fusion Dynamics for Hot Fusion Reactions revealed in Quasielastic Fusion Barrier Distributions*
9:45 AM–10:00 AM
Presenter:
Taiki Tanaka
(RIKEN)
Authors:
Taiki Tanaka
(RIKEN)
Kosuke Morita
(RIKEN)
Kouji Morimoto
(RIKEN)
Daiya Kaji
(RIKEN)
Hiromitsu Haba
(RIKEN)
Rose Ann Boll
(ORNL)
Nathan T. Brewer
(ORNL)
Shelley Van Cleve
(ORNL)
David Jarvis Dean
(ORNL)
Satoshi Ishizawa
(RIKEN)
Yuta Ito
(Japan Atomic Energy Agency)
Yukiko Komori
(RIKEN)
Katsuhisa Nishio
(Japan Atomic Energy Agency)
Toshitaka Niwase
(RIKEN)
B. C. Rasco
(ORNL)
James B. Roberto
(ORNL)
Krzysztof P. Rykaczewski
(ORNL Physics Division)
Hideyuki Sakai
(RIKEN)
Daniel W. Stracener
(ORNL)
Kouichi Hagino
(Tohoku university)
In order to clarify the fusion dynamics for hot fusion reactions, we measured the excitation functions on quasielastic (QE) scattering cross sections σQE for 22Ne+248Cm, 26Mg+248Cm, and 48Ca+238U systems. In contrast to previous QE fusion barrier distribution studies which measured the recoiled projectile nuclei at backward angles (θlab ∼ 170◦), this work obtained successfully the σQE for l = 0 by measuring the target nuclei recoiling into forward angle employing the gas-filled-type recoil ion separator GARIS. The QE fusion barrier distribution DQE were successfully extracted, and compared with coupled-channels calculations. The calculation results clearly shows that the DQE values are strongly affected by the deformation of the target nucleus and influenced by vibrational and rotational excitations of the colliding nuclei. Comparing the peak of the evaporation residue cross sections σER with the experimental average Coulomb barrier height B0, we found that the peaks appear well above the B0 in the barrier distributions. This indicates that the σER values are enhanced at the energy which corresponds to a compact collision geometry with the projectile impacting the side of the deformed target nucleus.
*248Cm material was provided by the U.S. DOE Isotope Program.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2018.HAW.LB.4
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