We present a study of the upper critical field of the newly discovered heavy fermion superconductor UTe 2 by magnetoresistivity measurements in pulsed magnetic fields up to 60 T and static magnetic fields up to 35 T. We show that superconductivity survives up to the metamagnetic transition at H m ≈ 35 T at low temperature. Above H m superconductivity is suppressed. At higher temperature superconductivity is enhanced under magnetic field leading to reentrance of superconductivity or an almost temperature independent increase of H c2 . By studying the angular dependence of the upper critical field close to the b axis (hard magnetization axis) we show that the maximum of the reentrant superconductivity temperature is depinned from the metamagnetic field. A key ingredient for the field-reinforcement of superconductivity on approaching H m appears to be an immediate interplay with magnetic fluctuations and a possible Fermi-surface reconstruction. 1 arXiv:1905.05181v1 [cond-mat.str-el]

Until recently, the spectroscopy of A-hypernuclei has been studied by use of the well-known, strangeness-exchanging (K,n) reactions. These reactions are typically characterized by small momentum transfer, q < qp, where qp is the Fermi momentum. They populate preferentially states of low angular momentum and are effective in producing "substitutior.al states" in which the A has the same orbital as the neutron it replaces (AL=0).

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