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Nuclear Theory·nucl-th

Friday·June 22, 2018

3 papers—2 primary·1 cross-listed

All3Primary2Cross-lists1
  1. 01

    Neutron-proton scattering with lattice chiral effective field theory at next-to-next-to-next-to-leading order

    Ning Li🇺🇸 · Serdar Elhatisari🇩🇪 · Evgeny Epelbaum🇩🇪 · Dean Lee🇺🇸 · Bing-Nan Lu🇺🇸 · Ulf-G. Meißner🇩🇪

    We present a new lattice formulation of chiral effective field theory interactions with a simpler decomposition into spin channels. With these interactions the process of fitting to the empirical scattering phase shifts is simplified, and the resulting lattice phase shifts are more accurate than in previous studies. We present results for the neutron-proton system up to next-to-next-to-next-to-leading order for lattice spacings of , , , and . Our results provide a pathway to lattice calculations of nuclear structure, reactions, and thermodynamics with accurate and systematic control over the chiral nucleon-nucleon force.

    nucl-thhep-latPRC(2018)·50 citations
  2. 02

    A dynamical model calculation to reconcile the nuclear fission lifetime from different measurement techniques

    M. T. Senthil Kannan · Jhilam Sadhukhan · B. K. Agrawal · M. Balasubramaniam · Santanu Pal

    The pre-scission particle multiplicities suggest a lifetime of 10 20 s for the nuclear fission to occur which is in contrast to the fission lifetime 10 18 s as predicted by atomic probe. This long standing ambiguity, arising due to the orders of magnitude differences among the fission lifetime measured from the nuclear and atomic probes, has been addressed within a dynamical model which includes the contributions from the nuclear shell effects. We show that, at lower excitation energies, these two probes decouples as the fissioning system survives for a long time without any particle evaporation. We also consider a wide range of reactions to study the impact of the excitation energy of compound nucleus on the fission dynamics in general. Our model predicts the average fission life time of superheavy nucleus 302 120, to be more than 10 18 s which is in reasonable agreement with the recent experiments.

    nucl-thPRC(2018)·24 citations

Affiliations

first authorsco-authorsvia INSPIRE