کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10724739 | 1034033 | 2007 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sensitivity of nuclear transition frequencies to temporal variation of the fine structure constant or the strong interaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Sensitivity of nuclear transition frequencies to temporal variation of the fine structure constant or the strong interaction Sensitivity of nuclear transition frequencies to temporal variation of the fine structure constant or the strong interaction](/preview/png/10724739.png)
چکیده انگلیسی
There exist in nature a few nuclear isomers with very low (eV) excitation energies, and the combination of low energy and narrow width makes them possible candidates for laser-based investigations. The best candidate is the lowest-energy excited state known in nuclear physics, the 7.6(5) eV isomer of 229Th. A recent study suggests that a measurement of the temporal variation of the excitation energy of this isomer would have 5-6 orders of magnitude enhanced sensitivity to a variation of the fine structure constant (뱉
1/137.036) or of a strong interaction parameter (mq/ÎQCD). We reexamine the physics involved in these arguments. By invoking the Feynman-Hellmann Theorem we argue that there is no expectation of significantly enhanced sensitivity to a variation in the fine structure constant (beyond that obtained from experimental considerations such as the low energy and narrow width of the isomer). A similar argument applies for the strong interaction, but evaluating the shift due to temporal variations of the underlying parameters of the strong interaction may be beyond current nuclear structure techniques.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physics Letters B - Volume 650, Issue 4, 5 July 2007, Pages 229-232
Journal: Physics Letters B - Volume 650, Issue 4, 5 July 2007, Pages 229-232
نویسندگان
A.C. Hayes, J.L. Friar,