/ Theory-Nucl arXiv:0809.3685


Role of the target orientation angle and orbital angular momentum in the evaporation residue production


Fazio, Giovanni (Messina U.) ; Giardina, Giorgio (Messina U.) ; Hanappe, Francis (Brussels U.) ; Mandaglio, Giuseppe (Messina U.) ; Manganaro, Marina (Messina U.) ; Muminov, Akhtam I. (Tashkent, IYF) ; Nasirov, Avazbek K. (Dubna, JINR) ; Sacca, Carmelo (Messina U.)

Published in: J.Phys.Soc.Jap.
Year: 2008
Vol.: 77
Page No: 124201
Pages: 20

Abstract: The influence of the orientation angles of the target nucleus symmetry axis relative to the beam direction on the production of the evaporation residues is investigated for the $^{48}$Ca+$^{154}$Sm reaction as a function of the beam energy. At low energies ($E_{\rm c.m.}<$137 MeV), the yield of evaporation residues is observed only for collisions with small orientation angles ($\alpha_T<45^0$). At large energies (about $E_{\rm c.m.}=$140--180 MeV) all the orientation angles $\alpha_T$ can contribute to the evaporation residue cross section $\sigma_{ER}$ in the 10--100 mb range, and at $E_{c.m.}>$180 MeV $\sigma_{ER}$ ranges around 0.1--10 mb because the fission barrier for a compound nucleus decreases by increasing its excitation energy and angular momentum.

Keyword(s): fusion ; quasifission ; evaporation residues ; orientation of reactants

Web-Page: http://jpsj.ipap.jp/link?JPSJ/77/124201/; http://inspirebeta.net/record/797199/files/ER-orien.png; http://inspirebeta.net/record/797199/files/FusLOrien.png; http://inspirebeta.net/record/797199/files/Fusbar.png; http://inspirebeta.net/record/797199/files/QfissSpinOr.png; http://inspirebeta.net/record/797199/files/Vcoulvib.png; http://inspirebeta.net/record/797199/files/barriers.png; http://inspirebeta.net/record/797199/files/capfus.png; http://inspirebeta.net/record/797199/files/caporienEcm.png; http://inspirebeta.net/record/797199/files/fig1.png; http://inspirebeta.net/record/797199/files/pcnorient2.png

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