דף 1 מתוך 1

סמינר במרכז הקוונטי

נשלח: 13:10 29/07/2019
על ידי avivaf
היי אביבה


אפשר להפיץ פרטים על הסמינר הזה שאנו מקיימים בשבוע הבא?
זה עשוי לעניין סגל ותלמידים גם יחד.
ג'ודי


We will have a seminar next week given by Ben Ohayon of Hebrew University, on Monday, August 5 at 11:00 AM in building 51, room 217.
Please see details below.
Title: Isotope shifts in neon: Atomic Physics meets Big Data

Abstract:

Isotope shifts are minute differences between the electronic energy levels of different isotopes of the same element. These days they are the focus of a multitude of theoretical and experimental efforts since they constitute precise atomic physics probes for studying nuclear properties, and their main use is nuclear-model-independent determination of (rms) charge-radii differences.
In this talk I will report precision measurements of the 22Ne-20Ne isotope shift for several transitions, at the level of 100 KHz, utilizing the method of dual-sideband spectroscopy [1], as well as state-of-the-art, ab initio field-shift calculations of neon filed shift factor [2]. An immediate consequence of the new field shift factor is a substantial change to the previously determined charge radii of radioactive neon isotopes, including the two-proton halo candidate 17Ne [3].
Our results are combined with all other historical measurements (100 years, 50 publications, 230 transition shifts) in a global fit to obtain the isotope shifts of all fifty low-lying neon levels with high precision [4]. These level shifts show a wealth of electronic, nuclear andrelativistic phenomena.
Relying on the analogy between mass shift and fine-structure operators, we explain this plethora of neon level-shifts utilizing a small number of effective parameters in a global parametric investigation.Our investigation provides a birds-eye view on the isotope shift phenomena neon, with consequences to other noble gasses. From this vantage point, we reinterpret every effort made tocalculate neon mass-shifts ab initio, and show that a surprising agreement between experimentand theory is obtained.

[1] B Ohayon, G Gumpel, G Ron. Journal of Physics B: Atomic, Molecular and Optical Physics 50 (5), 055401

[2] E. V. Kahl and J.C. Berengut. Computer Physics Communications, 238, 232-243.

[3] K. Marinova et. al. Physical Review C, 84(3), 034313.

[4] B. Ohayon, H. Rahangdale, A. J. Geddes, J. C. Berengut, and G. Ron. Physical Review A 99 (4), 042503

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Dr. Judith Kupferman
Center for Quantum Information and Technology
Ben Gurion University of the Negev
Phone: 0505-381795