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Nuclear Theory·nucl-th

Friday·May 15, 2015

5 papers—3 primary·2 cross-listed

All5Primary3Cross-lists2
  1. 01

    Dominant contributions to the nucleon-nucleon interaction at sixth order of chiral perturbation theory

    D. R. Entem · N. Kaiser · R. Machleidt · Y. Nosyk

    We present the dominant two- and three-pion-exchange contributions to the nucleon-nucleon interaction at sixth order (next-to-next-to-next-to-next-to-next-to-leading order, N5LO) of chiral perturbation theory. Phase shifts with orbital angular momentum L>=4 are given parameter free at this order and allow for a systematic investigation of the convergence of the chiral expansion. The N5LO contribution is prevailingly repulsive and considerably smaller than the N4LO one, thus, establishing the desired trend towards convergence. Using low-energy constants that were extracted from an analysis of pi-N scattering at fourth order, the predictions at N5LO are in excellent agreement with the empirical phase shifts of peripheral partial waves.

    nucl-thnucl-exPRC(2015)·104 citations
  2. 02

    Microscopic Study of (p,) Reactions in Mass Region A=110-125

    Dipti Chakraborty · Saumi Dutta · G. Gangopadhyay · Abhijit Bhattacharyya

    Low energy proton capture reactions have been studied in statistical model using the semi-microscopic optical potential in the mass range A=110-125. Nuclear density obtained from relativistic mean field calculation has been folded with nucleon-nucleon interaction to obtain the optical potential. Theoretical results have been compared with experimental measurements to normalize the potential. Results have also been compared with a standard calculation available in the literature.

    nucl-thPRC(2015)·7 citations
  3. 03

    Quarteting and spin-aligned proton-neutron pairs in heavy N=Z nuclei

    M. Sambataro · N. Sandulescu

    We analyze the role of maximally aligned isoscalar pairs in heavy nuclei by employing a formalism of quartets. Quartets are superpositions of two neutrons and two protons coupled to total isospin and given . The study is focused on the contribution of spin-aligned pairs carrying the angular momentum to the structure of Cd and Pd. We show that the role played by the pairs is quite sensitive to the model space and, in particular, it decreases considerably by passing from the simple space to the more complete ,,, space. In the latter case the description of these nuclei in terms of only spin-aligned pairs turns out to be unsatisfactory while an important contribution, particularly in the ground state, is seen to arise from isovector and isoscalar pairs. Thus, contrary to previous studies, we find no compelling evidence of a spin-aligned pairing phase in Pd.

    nucl-thPRC(2015)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE