Is the decay possible considering the appropriate conservation laws? State why or why not.
No, this decay isn't possible since the baryon number is not conserved.
OpenStax College Physics for AP® Courses, Chapter 33, Problem 28 (Problems & Exercises)
This is College Physics Answers with Shaun Dychko. Considering the various conservation laws we have, is the decay of a neutron into a positron and electron possible? And the answer is no because if you look up in this table [33.2], the baryon number for a neutron is 1 whereas the baryon number for an electron is 0 and for a positron. So we have 1 on the left for baryon number and 0 in total on the right so the baryon number is not conserved therefore this reaction is not possible.