Determination of241Pu(n,f) cross sections by the surrogate-ratio method

Determination ofPu238(n,f)andNp236(n,Pal1, Santra2, Nayak3 et al. 2015Phys. Rev. CSelf Cite12060View full textAdd to dashboardCite

“…Similar to the 238 Pu(n,f ) reaction, the calculations for the present system also consider the decay of the compound nuclei up to fourth chance fission, i.e., the decay of 237,236,235,234 Np nuclei. The initial barrier parameters for 237 Np and 236 Np isotopes have been taken from RIPL-3 and those for the 235 Np and 234 Np isotopes have been calculated from the barrier formula (BF) [17]. Modified barrier parameters have been used to get a best fit Equivalent Neutron Energy (MeV) 5 1 0 1 5 2 0 2 5…”

“…Hence it was calculated from the barrier formula (BF) as given in Ref. [17]. The final calculations have been made after slight modifications of the barrier parameters to explain the measured (n,f ) cross sections.…”

“…Later on, the "surrogate ratio (SR)" method was proposed by Plettner et al [11] for the same purpose. Recently, the SR method was benchmarked and applied to determine several neutron induced fission cross sections [6,7,[12][13][14][15][16][17]. Another method named "hybrid surrogate ratio (HSR)" method is also being used to determine the (n,f ) cross sections as done in Ref.…”

Determination of the239Np(n,f)and240NpDesai1, Nayak2, Saxena3 et al. 2013Phys. Rev. CSelf Cite13020View full textAdd to dashboardCite

“…Aluminum foil of thickness of 3.86 mg/cm 2 was placed in front of the particle telescopes to stop the fission fragments and thereby protect the E detectors from radiation damage. The PLFs (protons, deuterons, tritons and α particles) are uniquely identified by plotting the partial energy loss in the E detector against the residual energy (E res ) in the E detector as reported earlier [8].…”

“…A charged particle reaction on these neighboring isotopes can be used to form the same compound nucleus as that of the desired neutron-induced reactions [5]. In the past, surrogate reaction methods in various forms such as the absolute surrogate method [3,4], the surrogate ratio method (SRM) [6][7][8], and the hybrid surrogate ratio method (HSRM) [9] have been employed to get indirect estimates of the neutron-induced reaction cross sections of many short-lived target nuclei. In the absolute surrogate method, the measured fission decay probabilities are simply multiplied by estimated neutron capture cross sections to deduce the (n, f ) cross section.…”