Radiative Corrections for a Precision Determination of the Fine Structure Constant

the innovation of a statistical model to estimate dependable rainfall (dr) and develop it for determination and classification of drought and wet years of iran

آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...

A new photon recoil experiment: towards a determination of the fine structure constant

We report on progress towards a measurement of the fine structure constant α to an accuracy of 5 × 10 or better by measuring the ratio h/mCs of the Planck constant h to the mass of the cesium atom mCs. Compared to similar experiments, ours is improved in three significant ways: (i) simultaneous conjugate interferometers, (ii) multi-photon Bragg diffraction between same internal states, and (iii...

The Meaning of the Fine Structure Constant

g Factor of Light Ions for an Improved Determination of the Fine-Structure Constant.

A weighted difference of the g factors of the H- and Li-like ions of the same element is theoretically studied and optimized in order to maximize the cancellation of nuclear effects between the two charge states. We show that this weighted difference and its combination for two different elements can be used to extract a value for the fine-structure constant from near-future bound-electron g fa...

Method for Precision Test of Fine Structure Constant Variation with Optical Frequency References

A test of the possible variation in space-time of the fine structure constant by comparing In and Tl optical frequency references is proposed. The ions would be confined in a linear trap spaced by about 20μm and the frequency comparison would be realized using an optical stabilization transfer cavity. The limit of α̇/α∼ 10/τ can be approached with this method, where τ is the time over which the ...