A systematic metadata analysis of the combined Jodrell Bank pulsar glitch catalogues (Espinoza et al. 2011; Basu et al. 2022) reveals a major population of rotational events exhibiting a negative persistent change in spin-down rate (Δν̇/ν̇ < 0). Out of approximately 940 glitches with successfully constrained post-glitch braking parameters, 145 events (~15.4%) show that the pulsar becomes permanently less braked following the event. This specific behavior is shown to be 150 times more statistically frequent than the classic "anti-glitch" (Δν/ν < 0). No previous study has systematically counted these events across the full catalogue. The 15.4% figure is novel. Because standard superfluid vortex unpinning models lack an intrinsic mechanism to decrease the external macro-torque or post-glitch braking configuration, we categorize these events as a distinct, regular mechanical state of neutron star rotational evolution rather than statistical anomalies.
Budinny V (Thu,) studied this question.