The β-delayed neutron emission in the 85,86As β-decays has been measured at the Ion Guide Isotope Separator On Line facility of the Accelerator Laboratory of the University of Jyv\"askyl\"a. The complete β-decays have been studied with a complex setup that consists of a plastic scintillator for β-particles, MONSTER -- the MOdular Neutron time-of-flight SpectromeTER -- for neutrons, and a high-purity germanium and four LaBr3 crystals for γ-rays. The β-delayed neutron energy distributions have been determined by unfolding the time-of-flight spectra with an innovative methodology based on the iterative Bayesian unfolding method and accurate Monte Carlo simulations. The results obtained for 85As are in excellent agreement with the existing evaluated data, validating the proposed methodology. In the case of 86As, a stronger neutron intensity at higher energies than previously predicted is discovered.
@article{arxiv.2501.18285,
title = {$\beta$-delayed neutron spectroscopy of $^{85, 86}$As with MONSTER at IGISOL},
author = {A. Pérez de Rada Fiol and T. Martínez and D. Cano-Ott and H. Penttilä and J. Agramunt and V. Alcayne and A. Algora and S. Alhomaidhi and J. Äystö and K. Banerjee and O. Beliuskina and J. Benito and C. Bhattacharya and F. Calviño and G. Cortés and R. P. de Groote and A. de Roubin and C. Delafosse and C. Domingo-Pardo and S. Geldhof and W. Gins and M. Hukkanen and A. Jokinen and A. Kankainen and J. Lerendegui-Marco and J. Llanes Gamonoso and I. Matea and E. Mendoza and A. K. Mistry and D. A. Nesterenko and J. Plaza and I. Pohjalainen and S. Rinta-Antila and P. Roy and A. Sanchez-Caballero and J. L. Taín and D. Villamarín and M. Vilen},
journal= {arXiv preprint arXiv:2501.18285},
year = {2025}
}
Comments
10 pages, 11 figures, revised version submitted to Physical Review C