614 articles – 3077 Notices  [english version]
 HAL : in2p3-00686713, version 1
 arXiv : 1204.1987
 Physical Review Letters 109 (2012) 032506
 New precision mass measurements of neutron-rich calcium and potassium isotopes and three-nucleon forces
 (2012)
 We present precision Penning-trap mass measurements of neutron-rich calcium and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN system the mass of $^{51}$K was measured for the first time, and the precision of the $^{51,52}$Ca mass values were improved significantly. The new mass values show a dramatic increase of the binding energy compared to those reported in the atomic mass evaluation. In particular, $^{52}$Ca is more bound by 1.74 MeV, and the behavior with neutron number deviates substantially from the tabulated values. An increased binding was predicted recently based on calculations that include three-nucleon (3N) forces. We present a comparison to improved calculations, which agree remarkably with the evolution of masses with neutron number, making neutron-rich calcium isotopes an exciting region to probe 3N forces at neutron-rich extremes.
 Thème(s) : Physique/Physique Nucléaire ExpérimentalePhysique/Physique Nucléaire Théorique
 Lien vers le texte intégral : http://fr.arXiv.org/abs/1204.1987
 in2p3-00686713, version 1 http://hal.in2p3.fr/in2p3-00686713 oai:hal.in2p3.fr:in2p3-00686713 Contributeur : Michel Lion <> Déposé pour le compte de : Hervé Savajols <> Soumis le : Mercredi 11 Avril 2012, 10:03:01 Dernière modification le : Lundi 23 Juillet 2012, 09:16:21