Statistical model analysis of fission fragment angular distributions for the system 16 O + 181 Ta

Fission fragment angular distributions have been measured for the fusion of ${}^{16}\mathrm{O}$ with deformed ${}^{181}\mathrm{Ta}$ target, in the energy range 90 MeV to 110 MeV. Combining with the existing data of evaporation residue and fission cross sections in the literature, the fusion cross sections have been determined in the range $1.1l~{E/V}_{B}l~1.6.$ Detailed statistical model analysis of the entire data set has been performed and it has been shown that fission fragment anisotropies calculated are in good agreement with the experimental data. Even at the lowest energy studied, ${(E=1.1V}_{B})$ as there is good agreement between the data and the calculation, it can be concluded that the quasifission effect is negligible at this energy.

[1]  S. Kailas,et al.  Possible influence of neutron shell closure (N c =126) on fission anisotropies for 19 F+ 194,198 Pt systems , 2002 .

[2]  M. Dasgupta,et al.  Loss of memory of target nucleus deformation axis in heavy-ion fusion-fission , 2000 .

[3]  M. Sharan,et al.  Fission fragment angular distributions in 16O+181Ta , 1999 .

[4]  R. Vandenbosch,et al.  Is quasifission responsible for anomalous fission fragment anisotropies , 1998 .

[5]  S. Kailas Heavy-ion induced fission at near-barrier energies , 1997 .

[6]  N. Takahashi,et al.  Specific Fission J-Window and Angular Momentum Dependence of the Fission Barrier , 1997 .

[7]  Leigh,et al.  Fusion-fission versus quasifission: Effect of nuclear orientation. , 1995, Physical review letters.

[8]  S. Kailas,et al.  Influence of pre-fission neutron emission on fission fragment angular distribution for the system209Bi +16O , 1994 .

[9]  C. Dasso,et al.  CCDEF - A simplified coupled-channel code for fusion cross sections including static nuclear deformations , 1989 .

[10]  A. Sierk,et al.  Macroscopic model of rotating nuclei. , 1986, Physical review. C, Nuclear physics.

[11]  B. Back,et al.  Quasi-fission — The mass-drift mode in heavy-ion reactions , 1985 .

[12]  Tsang,et al.  Angular distributions in heavy-ion-induced fission. , 1985, Physical review. C, Nuclear physics.

[13]  Back Complete fusion and quasifission in reactions between heavy ions. , 1985, Physical review. C, Nuclear physics.

[14]  D. Hinde,et al.  Measurement of pre-fission neutrons from 200Pb; Further limits to the statistical fission parameters , 1983 .

[15]  S. Kailas,et al.  On the anisotropy of multi-chance, high-spin fission , 1980 .

[16]  A. Gavron Statistical model calculations in heavy ion reactions , 1980 .

[17]  S. Steadman,et al.  Elastic scattering, transfer reactions, and fission induced by O-16 ions on Ta-181 and Pb-208 , 1977 .