Report
Empirical pairing gaps, shell effects, and di-neutron spatial correlation in neutron-rich nuclei
| العنوان: | Empirical pairing gaps, shell effects, and di-neutron spatial correlation in neutron-rich nuclei |
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| المؤلفون: | Changizi, S. A., Qi, Chong, Wyss, R. |
| المصدر: | Nuclear Physics A 940, 210 (2015) |
| سنة النشر: | 2015 |
| المجموعة: | Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory |
| الوصف: | The empirical pairing gaps derived from four different odd-even mass staggering formulas are compared. By performing single-$j$ shell and multi-shell seniority model calculations as well as by using the standard HFB approach with Skyrme force we show that the simplest three-point formula $\Delta_C^ {(3)}(N)=\frac{1}{2}\left[B(N,Z)+B(N-2,Z)-2B(N-1,Z)\right]$ can provide a good measure of the neutron pairing gap in even-$N$ nuclei. It removes to a large extent the contribution from the nuclear mean field as well as contributions from shell structure details. It is also less contaminated by the Wigner effect for nuclei around $N=Z$. We also show that the strength of $\Delta^ {(3)}_C(N)$ can serve as a good indication of the two-particle spatial correlation in the nucleus of concern and that the weakening of $\Delta^ {(3)}_C(N)$ in some neutron-rich nuclei indicates that the di-neutron correlation itself is weak in these nuclei. Comment: 10 pages, 9 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.nuclphysa.2015.04.010 |
| URL الوصول: | http://arxiv.org/abs/1508.01946 |
| رقم الانضمام: | edsarx.1508.01946 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.nuclphysa.2015.04.010 |
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