To understand atomic nucleus from a new nuclear structure model

International Conference on Quantum Physics and Nuclear Engineering

March 14-16, 2016 London, UK

Xiaodong Li, Qijun Liu, Gongyi Li, Yihe Li and Zengyong Chu

National University of Defense Technology, P R China

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

To explain some basic facts of atomic nucleus, a nuclear structure model of â�?�?ring plus extra nucleonâ�? is proposed. For nuclei larger than 4He inclusive, protons (Pâ�?�?s) and neutrons (Nâ�?�?s) are basically bound alternatively to form an 2Z ZE ring. The ring folds with a â�?�?bond angleâ�? of 90�?�? for every 3 continuous nucleons to make the nucleons packed densely. Extra N(â�?�?s) can bind to ring-P with the same â�?�?bond angleâ�? and â�?�?bond distanceâ�?. When 2 or more Pâ�?�?s are geometrically available, the extra N tends to be stable. Extra P can bind with ring N in a similar way when the ratio of N/P <1 although the binding is much weaker. Even-Z rings always have superimposed gravity centers of P and N; while for odd-Z rings, both centers of P and N must be eccentric. The eccentricity results in a depression of EB and therefore specific zigzag features of EB/A. This can be well explained by the shift of eccentricity by extra nucleons. Symmetrical center may present in even-Z rings and normal even-even nuclei. While for odd-Z ring, only antisymmetric center (every P can find an N through the center and vice versa) is possible. Based on this model, a pair of mirror nuclei, PX+nNX and PXNX+n, should be equivalent in packing structure just like black-white photo and the negative film. Therefore, an identical spin and parity was confirmed for hundreds of pairs. In addition, the EB/A difference of all the mirror nuclei pair is very nearly a constant of 0.184n MeV. Many other facts can also be easily understood from this model, such as the nuclear stabilities of isotopes in elements from He to Ne; the stability sequence of 9Be, 10Be, 7Be and 8Be; the neutron halo in neutron-rich nuclides; the general rule for most stable isotopes: odd-Z elements are odd A, even-Z elements are even A; and the highest cohesive energy of Li, Be, B atoms in their own elementary group and so on.

Biography :

Email: xdli0153@sina.com