نتایج جستجو برای: antiproton

تعداد نتایج: 1381  

Journal: :SciPost physics 2022

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;...

Journal: :European Physical Journal D 2021

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 $$...

Journal: :Progress in Particle and Nuclear Physics 2013

Journal: :Physical review letters 2011
G B Andresen M D Ashkezari M Baquero-Ruiz W Bertsche P D Bowe E Butler P T Carpenter C L Cesar S Chapman M Charlton J Fajans T Friesen M C Fujiwara D R Gill J S Hangst W N Hardy M E Hayden A J Humphries J L Hurt R Hydomako S Jonsell N Madsen S Menary P Nolan K Olchanski A Olin A Povilus P Pusa F Robicheaux E Sarid D M Silveira C So J W Storey R I Thompson D P van der Werf J S Wurtele Y Yamazaki

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 ...

Journal: :Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 2006

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