Fission time scale from pre-scission neutron and α multiplicities in the O16 + Pt194

Dynamical model calculation to reconcile the nuclear fission lifetime from different measurement techniques

“…Substantial effort has been made to measure the fission lifetime. Traditionally, the pre-scission charged-particles [8][9][10], neutron [9][10][11][12][13][14][15], and γ-ray [16][17][18][19] multiplicities are often used as a clock to estimate the fission time. The transient time also can be estimated by measuring the fission fragment distributions [20].…”

Inference on fission timescale from neutron multiplicity measurement in 18O + 184W

“…Length of the flight path is denoted by d and t is the measured TOF. The pre-scission (ν pre ) and Neutron spectra (filled squares) for 18 O + 184 W at E * CN = 76.37 MeV along with the least-square fits for the total (solid lines), pre-scission (dashed lines), and postscission contributions (dotted and dash-dotted lines) from the two fragments measured at six different neutron detectors (the respective angular coordinates are mentioned in each panel) chosen arbitrarily for illustration.…”

“…The experiment was carried out using the National Array of Neutron Detectors (NAND) facility of the Inter University Accelerator Center (IUAC), New Delhi. Pulsed beam of 18 O having a repetition rate of 250 ns delivered from the 15UD Pelletron accelerator was bombarded on a 184 W target of thickness 770 μg cm −2 . The target was prepared by using the ultra-high vacuum evaporation technique with a carbon backing of 40 μg cm −2 .…”

“…Different experimental probes like particle multiplicities, fission-fragments' mass, energy, and angular distributions and their correlations [6][7][8][9][10] are usually used to understand the nuclear dynamics in low-energy heavy-ion collisions. Particularly, measurement of the prescission particle-multiplicities (neutron [11][12][13][14], light charged particles [15][16][17][18], giant dipole resonance (GDR) γ ray [19][20][21][22]) is one of the principal tool to investigate fission dynamics. In our previous work, we have measured the neutron multiplicity for the 204 Pb compound nucleus (CN) and it was found that the nuclear dissipation depends on the entrance channel mass asymmetry α and Coulomb interaction term Z P Z T [23].…”

“…In the present work, we have measured the pre-scission and post-scission neutron multiplicities for the reaction 18 O + 184 W, populating the CN 202 Pb. The measurements are carried out at three different beam energies.…”