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Titolo:
ELECTROMAGNETIC PROPERTIES AND HIGH-SPIN STATES IN TA-173
Autore:
CARLSSON H; BARK RA; EKSTROM LP; NORDLUND A; RYDE H; HAGEMANN GB; FREEMAN SJ; JENSEN HJ; LONNROTH T; PIIPARINEN MJ; SCHNACKPETERSEN H; INGEBRETSEN F; TJOM PO;
Indirizzi:
LUND UNIV,DEPT PHYS,SOLVEGATAN 14 LUND SWEDEN UNIV COPENHAGEN,TANDEM ACCELERATOR LAB,NIELS BOHR INST ROSKILDE DENMARK UNIV OSLO,DEPT PHYS OSLO NORWAY
Titolo Testata:
Nuclear physics. A
fascicolo: 1, volume: 592, anno: 1995,
pagine: 89 - 129
SICI:
0375-9474(1995)592:1<89:EPAHSI>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
RARE-EARTH NUCLEI; ODD-A NUCLEI; INTRINSIC STATES; TRANSITION RATES; ROTATING NUCLEI; CONFIGURATION; QUASIPARTICLE; DEFORMATIONS; SELECTION; ISOTOPES;
Keywords:
NUCLEAR REACTIONS GD-160(F-19,6N); E; 105 MEV; MEASURED E(GAMMA); I-GAMMA; GAMMA-GAMMA COIN; GAMMA-GAMMA(THETA); TA-173 DEDUCED LEVELS; J, PI ROTATIONAL BAND STRUCTURE; CONFIGURATIONS; ALIGNMENTS; B(M1) B(E2) RATIOS; B(E1) VALUES; ENRICHED TARGET; ARRAY OF COMPTON-SUPPRESSED GE DETECTORS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
44
Recensione:
Indirizzi per estratti:
Citazione:
H. Carlsson et al., "ELECTROMAGNETIC PROPERTIES AND HIGH-SPIN STATES IN TA-173", Nuclear physics. A, 592(1), 1995, pp. 89-129

Abstract

High-spin properties of rotational bands are studied in Ta-173 using the Gd-160(F-19,6n) reaction at bombarding energies of 103-105 MeV. With the existing bands being extended, and new bands established, a total of 16 rotational sequences are interpreted in terms of their (multi) quasiparticle structure. Measurements of electromagnetic properties for these bands include E2/M1 mixing ratios, branching ratios and lifetimes of isomeric states close to band heads, for which all energies have now been determined. Particular emphasis is devoted to (i) the band structures related to the 1/2(-) [541] intruder configuration, for which both favoured, and unfavoured partners as well as the extended g-and S-bands in the (delayed) crossing region have been established, (ii) the reduced E1 transition strength between the (new) 1/2(+) [411] and 1/2(-) [541] bands, which is strongly enhanced, most likely due tocoupling to octupole degrees of freedom, and show a Delta I = 4 staggering, (iii) the observation of weak interband transitions between thetwo partners of a pseudo-spin doublet composed of the 5+ [402] and 1[404] bands together with accurately measured intraband mixing ratiosenable an analysis of the mixing of these bands through comparisons to particle-rotor calculations, (iv) the observed three-quasiparticle bands which are assigned to specific configurations coupling the lowestprotons to lowest two-quasineutrons with negative parity.

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Documento generato il 05/12/20 alle ore 03:45:36