کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1836847 | 1527083 | 2015 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The role of seniority-zero states in nuclear level densities
ترجمه فارسی عنوان
نقش ایده های صفر در تراکم های سطح هسته ای
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موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک هسته ای و انرژی بالا
چکیده انگلیسی
At low excitation energies seniority-zero states dominate the level density of K=0 bands in deformed even-even nuclei, while they play no role at higher excitation energies. We describe the level densities in a Fermi-gas model as well as in a combinatorial level-density model and compare to detailed experimental data for some rare-earth nuclei. An explanation is provided for recent observations of an odd-even staggering in the spin-distribution function as an effect of r-symmetry of wave functions for deformed nuclei. The structure of 0+ states in deformed nuclei is discussed in the model and compared to data, stressing the role of the seniority quantum number. The Fermi-gas model is utilized to obtain an overview of the odd-even staggering phenomenon in other mass regions. Odd-even staggering in spherical nuclei, appearing in open-shell nuclei, is briefly discussed as caused by fermion exchange symmetry.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Physics A - Volume 941, September 2015, Pages 97-120
Journal: Nuclear Physics A - Volume 941, September 2015, Pages 97-120
نویسندگان
S. Ã
berg, B.G. Carlsson, Th. Døssing, P. Möller,