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20 April 2024

» pubmed » pmid16197134

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Evidence for pygmy and giant dipole resonances in 130Sn and 132Sn
P Adrich ; A Klimkiewicz ; M Fallot ; K Boretzky ; T Aumann ; D Cortina-Gil ; U Datta Pramanik ; Th W Elze ; H Emling ; H Geissel ; M Hellström ; K L Jones ; J V Kratz ; R Kulessa ; Y Leifels ; C Nociforo ; R Palit ; H Simon ; G Surówka ; K Sümmerer ; W Walu? ; ;
Date:	23 Sep 2005
Journal:	Phys Rev Lett, 95 (13), 132501
Abstract:	The dipole strength distribution above the one-neutron separation energy was measured in the unstable 130Sn and the double-magic 132Sn isotopes. The results were deduced from Coulomb dissociation of secondary Sn beams with energies around 500 MeV/nucleon, produced by in-flight fission of a primary 238U beam. In addition to the giant dipole resonance, a resonancelike structure ("pygmy resonance") is observed at a lower excitation energy around 10 MeV exhausting a few percent of the isovector E1 energy-weighted sum rule. The results are discussed in the context of a predicted new dipole mode of excess neutrons oscillating out of phase with the core nucleons.
Source:	PubMed, pmid16197134
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