نتایج جستجو برای: antiproton
تعداد نتایج: 1381 فیلتر نتایج به سال:
Based on 4 yr AMS-02 antiproton data, we present bounds the dark matter (DM) annihilation cross section vs. mass for some representative final state channels. We use recent cosmic-ray propagation models, a realistic treatment of experimental and theoretical errors, an updated calculation input spectra based release PYTHIA code. find that reported hints DM signal are statistically insignificant;...
We consider the neutralization of an excited antiprotonic helium ion which is accompanied by antiproton transitions to lower states during collisions with atoms $$({\bar{p}}\mathrm {He}^{2+})_{nl} + \mathrm {He} \rightarrow \left[ ({\bar{p}}\mathrm {He}^{2+})_{n_f l_f} e\right] _{1s} {He}^+$$ in a low-temperature medium. Interactions input and output channels are taken be similar potentials $$...
We demonstrate controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense, and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. In contrast, only a fraction of the antiprotons in a warm ...
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