First inverse-kinematics fission measurements in a gaseous active target

Abstract

International audienceThe fission of a variety of actinides was induced by fusion and transfer reactions between a 238U beam and 12C nuclei, in the active target MAYA. The performance of MAYA was studied, as well as its capability to reconstruct the fission-fragment trajectories. Furthermore, a full characterization of the different transfer reactions was achieved, and the populated excitation-energy distributions were investigated as a function of the kinetic energy in the entrance channel. The ratio between transfer-and fusion-induced fission cross-sections was also determined, in order to investigate the competition between both reaction types and its evolution with the incident energy. The experimental results will be discussed with a view to forthcoming radioactive-ion beam facilities, and next-generation active-target setups

Time-dependent mean-field determination of the excitation energy in transfer reactions: Application to the reaction U238 on C12Scamps1, Rodríguez–Tajes2, Lacroix3 et al. 2017Phys. Rev. CSelf Cite3030View full textAdd to dashboardCite

“…Using this information, we have estimated the average excitation energy of the heavy fragment before secondary decay for the different channels populated in the experiments of Refs. [34,35]. Results are shown by orange triangles in Fig.…”

“…In the experiment performed at GANIL, only transfer reactions leading to fission have been detected. The details of the experiment can be found in Ref [35]. In order to compare with experimental observations, one should start from the calculated pure transfer probabilities σ tr and account for: (i) the competition with fusion channel, and (ii) the fact that, even if transfer occurs, it does not automatically lead to the fission of the heavy fragment.…”

“…This energy loss is a priori properly described because TDHF correctly includes the one-body dissipation effects associated * Electronic address: scamps@nucl.ph.tsukuba.ac.jp to deformation and nucleon exchange processes [30][31][32][33]. Detailed measurements of 238 U+ 12 C transfer reactions have been performed at GANIL [34,35]. Data on the excitation of the transfer products have been individually obtained for each transfer channel, and the dependence with the center-of-mass energy has been experimentally investigated.…”

Performance test of the MAIKo active target

“…The reconstructed trajectory of a recoil particle determines the recoil angle and recoil energy, which are used to calculate the missing mass. Several active target systems have been developed [10][11][12][13][14][15][16], and measurements using these detectors have been reported [17][18][19][20][21][22][23][24]. A comprehensive review on the recent developments of active targets is given in Ref.…”