Application of an ab initio S matrix to data analysis of transfer reactions to the continuum populating Be11

Recently, the bound and continuum spectrum of ¹¹Be has been calculated within the ab initio no-core shell model with continuum (NCSMC) method, with the parity inversion in the ground state successfully reproduced. Here, the continuum spectrum obtained is in agreement with known experimental levels. The S matrix contained in the NCSMC continuum wave functions of the n + ¹⁰Be system is used in this work for the first time in a transfer-to-the-continuum (TC) reaction calculation. The TC approach is applied to study the excitation energy spectrum of ¹¹Be measured in the ⁹Be(¹⁸O,¹⁶O)¹¹Be reaction at 84 MeV. Previously known levels are confirmed and theoretical and experimental evidence for a 9/2⁺ state at E_x = 5.8 MeV is given, whose configuration is thought to be ¹⁰Be(2⁺)+n(d_5/2).