Phys.Rev. C 106, 064316 (2022)

L.Ma, H.B.Yang, Z.Y.Zhang, J.C.Pei, M.H.Huang, M.M.Zhang, C.Y.Qiao, X.J.Bao, Y.L.Tian, C.L.Yang, Y.S.Wang, Z.Zhao, X.Y.Huang, S.Y.Xu, W.X.Huang, Z.Liu, X.H.Zhou, Z.G.Gan

Attempts to produce new americium isotopes near N=126

NUCLEAR REACTIONS ^191,193Ir(⁴⁰Ar, xn)²³¹Am^*/²³³Am^*, E=190-204 MeV; measured reaction products, Eα, (recoils)α-α-α correlated events, using SHANS gas-filled recoil separator, 16 position-sensitive Si-strip detectors (PSSDs) for evaporation residues, and eight side silicon detectors (SSDs) for α particles at the HRIFL-Lanzhou facility. ^226,227,228Am; no evidence found for the detection of these nuclides, with upper limits of cross sections determined for the production of the compound nuclei of ²³¹Am and ²³³Am; discussed nonobservation of new americium isotopes in terms of reduced survival probabilities of compound nuclei ²³¹Am and ²³³Am due to their low fission barriers at high excitations.

NUCLEAR STRUCTURE ^{226,227,228,229}Am; calculated excitation functions for the production of these nuclides in ^191,193Ir(⁴⁰Ar, xn) using the statistical model code HIVAP. ^{230,231,232,233,234,235,236}Am; evaluated shell correction energies and fission barriers from FRDM2012, KTUY2005, and WS2010. ²²⁶U, ²²⁷Np, ^231,233Am; calculated fission barrier heights as functions of excitation energy and quadrupole deformation parameter β₂ using microscopic finite-temperature Skyrme Hartree-Fock+BCS theory.

doi: 10.1103/PhysRevC.106.034316