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Abstract:
Pairing correlations in atomic nuclei have shown to play a crucial role to many properties, in spite of the small effect on the total binding energy. The talk will start with introductory remarks on the symmetry energy in atomic nuclei, giving a different interpretation from what is found in standard text books. It will then move on to the specific properties of N=Z nuclei, where neutron and proton occupy near degenerate orbitals.
This specific situation enables two different kind of Cooper pairs to be formed, that either have iso spin T=0 and intrinsic spin S=1 or T=1 and S=0. It isshown that both condensates can coexist and generate a wave function that is a coherent superposition of both coupling modes. The effect of iso spin excitation is then studied and its effect on the pair correlations. A Meissner effectin iso spin is the resulting from those excitations. The formalism of approximate projection and symmetry restoration is discussed.
Biography:
Ramon Wyss is a professor emeritus in theoretical nuclear physics at KTH the Royal Institute of Technology and received the ’Edlundska prize’ of the Royal Swedish Academy of Science, March1995 for his work on high spin states in atomic nuclei. He has given numerous key notes lectures and published more than 300 articles in refereed journals within nuclear physics with a H-factor of ~60. His main contributions to nuclear physics is the development of Total Routhians (energy) Surface calculations with applications to high spin states in many nuclei, study of nuclear shapes, pairing correlations, alpha- and proton decay, to name a few. Ramon Wyss has been given courses in nuclear physics and theoretical nuclear physics at KTH. He also served as an honorary guest professor at Peking University, and at present is a guest professor at Shanghai Jiaotong University, Szechuan University and Univeristy of Electronics, Science and Technology Chengdu. Ramon Wyss served as vice president of KTH in charge of international education at KTH from 2002-2016 and has been engaged in the leadership of different European university networks contributing decisively to the internationalization of Swedish Engineering education. He has been instrumental for setting up the Knowledge and Innovation Community (KIC) InnoEnergyconsortium, as well as the strongly engaged in the formation of the EIT Health KIC. He has been the director of the KTH energy platform and served on several review panels. Through his years as vice president he has initiated university relations all over the globe in particular with China. Ramon Wyss received the Magnolia Silver Medal 2015 from the city of Shanghai and was appointed deputy chairman of the international advisory board of Beijing Jiatong University. He has served as evaluator for the Spanish Ministry of Education and as foreignexpert of the Chinese Ministry of Education for the evaluation of DUT and SJTU BSc education. He also served as evaluator for the Finnish Academy of Scienceresearch within nuclear and particle physics.