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pro vyhledávání: '"Hammer, H.-W."'
Using the effective-range expansion for the two-body amplitudes may generate spurious sub-threshold poles outside of the convergence range of the expansion. In the infinite volume, the emergence of such poles leads to the breakdown of unitarity in th
Externí odkaz:
http://arxiv.org/abs/2308.09545
We argue that many features of the structure of nuclei emerge from a strictly perturbative expansion around the unitarity limit, where the two-nucleon S waves have bound states at zero energy. In this limit, the gross features of states in the nuclea
Externí odkaz:
http://hdl.handle.net/10150/624335
http://arizona.openrepository.com/arizona/handle/10150/624335
http://arizona.openrepository.com/arizona/handle/10150/624335
Autor:
Hammer, H. -W.
Halo nuclei are characterized by a few weakly bound halo nucleons and a more tightly bound core. This separation of scales can be exploited in a few-body description of halo nuclei, since the detailed structure of the core is not resolved by the halo
Externí odkaz:
http://arxiv.org/abs/2203.13074
We discuss an alternative scheme for including effective range corrections in pionless effective field theory. The standard approach treats range terms as perturbative insertions in the T -matrix. In a finite volume this scheme can lead to singular b
Externí odkaz:
http://arxiv.org/abs/2109.11982
Publikováno v:
Few Body Syst. 62, 72 (2021)
Steven Weinberg's seminal papers from 1990-92 initiated the use of effective field theories (EFTs) for nuclei. We summarize progress, priorities, and open questions for nuclear EFT developments based on the 2019 INT program "Nuclear Structure at the
Externí odkaz:
http://arxiv.org/abs/2107.00413
Publikováno v:
SciPost Phys. 11, 008 (2021)
A few years ago, flow equations were introduced as a technique for calculating the ground-state energies of cold Bose gases with and without impurities. In this paper, we extend this approach to compute observables other than the energy. As an exampl
Externí odkaz:
http://arxiv.org/abs/2101.10958
We extend our previous calculation of the breakup of 11Be using Halo Effective Field Theory and the Dynamical Eikonal Approximation to include an effective 10Be-n-target force. The force is constructed to account for the virtual excitation of 10Be to
Externí odkaz:
http://arxiv.org/abs/2008.05898
Autor:
Hildenbrand, F., Hammer, H. -W.
Publikováno v:
Phys. Rev. C 102, 064002 (2020)
We calculate the lifetime of the hypertriton as function of the $\Lambda$ separation energy $B_\Lambda$ in an effective field theory with $\Lambda$ and deuteron degrees of freedom. We also consider the impact of new measurements of the weak decay par
Externí odkaz:
http://arxiv.org/abs/2007.10122
Publikováno v:
Phys. Rev. Lett. 123, 069202 (2019)
We reply to a Comment on our Letter [Phys. Rev. Lett. 118, 232501 (2017), arXiv:1612.01502] by A. Deltuva and R. Lazauskas [Phys. Rev. Lett 123, 069201 (2019), arXiv:1904.00925].
Comment: 2 pages, published version
Comment: 2 pages, published version
Externí odkaz:
http://arxiv.org/abs/1908.06610
Publikováno v:
Phys. Rev. Research 1, 033177 (2019)
We investigate the ground-state energy of a one-dimensional Fermi gas with two bosonic impurities. We consider spinless fermions with no fermion-fermion interactions. The fermion-impurity and impurity-impurity interactions are modelled with Dirac del
Externí odkaz:
http://arxiv.org/abs/1908.02483