Abstract:Evaporation residue cross sections for the reaction 16 O + 194 Pt were measured at beam energies in the range 75.4-103.1 MeV using the gas-filled separator Hybrid Recoil Mass Analyzer at the Inter University Accelerator Centre, New Delhi. The transmission efficiency of the separator was obtained using the calibration system 16 O + 184 W and a Monte Carlo simulation code. Measured evaporation residue cross sections were fitted with statistical model calculations using Kramers' formula. The present measurement p… Show more
“…The ER cross sections for 16 O + 194 Pt system were measured earlier using the HYRA spectrometer [13]. The only difference from the present experiment was that the size of scattering chamber was larger (angular acceptance of HYRA was more) in earlier work.…”
Section: E Transmission Efficiency Of Hyracontrasting
Experimental measurements of evaporation residue (ER) cross sections for the 19 F + 194,196,198 Pt reactions forming 213,215,217 Fr compound nuclei are reported. The cross sections are measured at beam energies in the range of 101-137.3 MeV. The survival probability of the 213 Fr compound nucleus with neutron number N = 126 is found to be lower than the survival probabilities of 215 Fr and 217 Fr with neutron numbers N = 128 and 130 respectively. Statistical model analysis of the ER cross sections show that an excitation energy dependent scaling of the finite-range rotating liquid drop model fission barrier is necessary to fit the experimental data. The fitted scaling factors for 213 Fr are found to be smaller than those of 215 Fr and 217 Fr for almost the entire range of excitation energies.
“…The ER cross sections for 16 O + 194 Pt system were measured earlier using the HYRA spectrometer [13]. The only difference from the present experiment was that the size of scattering chamber was larger (angular acceptance of HYRA was more) in earlier work.…”
Section: E Transmission Efficiency Of Hyracontrasting
Experimental measurements of evaporation residue (ER) cross sections for the 19 F + 194,196,198 Pt reactions forming 213,215,217 Fr compound nuclei are reported. The cross sections are measured at beam energies in the range of 101-137.3 MeV. The survival probability of the 213 Fr compound nucleus with neutron number N = 126 is found to be lower than the survival probabilities of 215 Fr and 217 Fr with neutron numbers N = 128 and 130 respectively. Statistical model analysis of the ER cross sections show that an excitation energy dependent scaling of the finite-range rotating liquid drop model fission barrier is necessary to fit the experimental data. The fitted scaling factors for 213 Fr are found to be smaller than those of 215 Fr and 217 Fr for almost the entire range of excitation energies.
“…Probing quasifission in reactions forming 210 Rn nucleus A. Shamlath studied in this work, which is in agreement with the experimental observations [21,27,30,24]. P CN values show a decreasing trend with increase in beam energy.…”
Section: Pos(inpc2016)194supporting
confidence: 91%
“…The recoil mass separator, HYRA (HYbrid Recoil mass Analyzer) [26,27] was used for the separation and identification of the ERs from the intense beam background. HYRA is a dual mode, dual stage mass separator, with its first stage can be operated in gas-filled mode or vacuum mode.…”
Section: Experimental Methods and Resultsmentioning
confidence: 99%
“…It is a function of various parameters [27,28] such as the entrance-channel mass asymmetry, beam energy, the target thickness, the exit channels of interest, the angular acceptance of the separator, the magnetic field and gas pressure settings, and the size of the focal plane detector. Entrance channel mass asymmetry, target thickness, angular acceptance of the HYRA, and size of the focal plane detector remain unchanged throughout the experiment, while the rest of the parameters change.…”
We studied the competition between fusion and quasifission by populating the compound nucleus (CN) 210 Rn through different entrance channels - 16 O+ 194 Pt and 30 Si+ 180 Hf, at energies around the Coulomb barrier. The larger widths of the fission fragment mass distribution in the 30 Si+ 180 Hf reaction which could not be explained by using transition state models, indicated the onset of quasifission in this reaction. Further, the evaporation residues (ERs) produced in these reactions were measured using the gas-filled recoil mass separator HYRA at IUAC. The measurements showed reduced ER cross sections for the 30 Si+ 180 Hf reaction when compared with that of 16 O+ 194 Pt at similar excitation energies, confirming the presence of quasifission in the 30 Si+ 180 Hf reaction. The experimental results are analysed using the dinuclear system (DNS) and statistical models to understand the possible influence of potential energy surfaces (PES) and different entrance channel conditions in heavy ion fusion reactions.
“…ER excitation function measurements were performed at laboratory beam energies (after correcting for the loss in the pressure window foil of carbon having thickness 660 txg/cm2 and half thickness of the targets) of 78.0 to 105.6 MeV for the l60 beam and 77.8 to 105.4 MeV for l80 . In addition, ER cross sections were also measured at one energy for the l60 + l94Pt reaction, for which data of ER excitation functions already exist [13], and this data was used for normalization and to obtain the transmission efficiency of the HYbrid Recoil mass Analyzer (HYRA). The heavy ERs produced in the reaction were separated from the intense beam background by the gas filled separator HYRA [14], It is a dual-mode, dual-stage recoil mass separator and spectrometer.…”
Evaporation residue (ER) cross sections for the 16180 + l98Pt reactions are measured in order to investigate fission hindrance. Compound nuclei (2l4'216Rn) are formed in the above fusion reactions at excitation energies in the range of 40-68 MeV. The experimental ER cross sections are compared with predictions from the statistical model calculations of compound nuclear decay where Kramers' fission width is used. The strength of nuclear dissipation is treated as a free parameter in the statistical model calculations in order to fit the experimental data.
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