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Titolo:
Dipole transitions to bound states in Fe-56 and Ni-58 - art. no. 024302
Autore:
Bauwens, F; Bryssinck, J; De Frenne, D; Govaert, K; Govor, L; Hagemann, M; Heyse, J; Jacobs, E; Mondelaers, W; Ponomarev, VY;
Indirizzi:
Vakgrp Subatom & Stralingsfys, B-9000 Ghent, Belgium Vakgrp Subatom & Stralingsfys Ghent Belgium B-9000 B-9000 Ghent, Belgium Russian Sci Ctr, Kurchatov Inst, Moscow, Russia Russian Sci Ctr Moscow Russia n Sci Ctr, Kurchatov Inst, Moscow, Russia Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna, Russia Joint InstNucl Res Dubna Russia liubov Lab Theoret Phys, Dubna, Russia
Titolo Testata:
PHYSICAL REVIEW C-NUCLEAR PHYSICS
fascicolo: 2, volume: 6202, anno: 2000,
pagine: 4302 -
SICI:
0556-2813(200008)6202:2<4302:DTTBSI>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-RESONANCE FLUORESCENCE; MIXED-SYMMETRY STATES; INELASTIC-SCATTERING; PHOTON SCATTERING; HEAVY-NUCLEI; STRENGTH; EXCITATIONS; FRAGMENTATION; ENERGY; ISOTOPES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
58
Recensione:
Indirizzi per estratti:
Indirizzo: Bauwens, F Vakgrp Subatom & Stralingsfys, Proeftuinstr 86, B-9000 Ghent, Belgium Vakgrp Subatom & Stralingsfys Proeftuinstr 86 Ghent Belgium B-9000
Citazione:
F. Bauwens et al., "Dipole transitions to bound states in Fe-56 and Ni-58 - art. no. 024302", PHYS REV C, 6202(2), 2000, pp. 4302

Abstract

A high-resolution study of dipole transitions to bound states up to 10 MeVin the fp-shell nuclei Fe-56 and Ni-58 was performed by means of the nuclear resonance fluorescence method. Unpolarized and partially linearly polarized bremsstrahlung photons with different end point energies (6.5, 10, and 12 MeV) were used to determine excitation energies, spins, parities, and transition widths of more than 60 levels observed in each nucleus between 2 and 10 MeV. The vast majority of the observed transitions are dipole ones and to the strongest of them an E1 assignment could be given. The E1 strengthdistribution shows a high concentration around 8.2 MeV that may be connected with the E1 pygmy resonance in heavier nuclei. The M1 spin-flip strengthshows a concentration around 8.7 MeV in Ni-58. On the contrary, in Fe-56 its distribution is rather flat. The observed M1 strength is weak in both nuclei. A study was made of the feeding and branching of the observed levels. Calculations were performed for these nuclei in the framework of the quasiparticle phonon model and a comparison with experimental results is made. Apart from the strength, experimental and calculated results agree quite well and information about a scissorslike mode in Fe-56 and a 1(-) two-phonon state in Ni-58 could be extracted.

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Documento generato il 29/11/20 alle ore 15:47:49