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Titolo:
STRUCTURAL CHARACTERISTICS OF ND-144 THROUGH GAMMA-RAY SPECTROSCOPY FOLLOWING INELASTIC NEUTRON-SCATTERING
Autore:
HICKS SF; DAVOREN CM; FAULKNER WM; VANHOY JR;
Indirizzi:
UNIV DALLAS,DEPT PHYS IRVING TX 75062 USN ACAD,DEPT PHYS ANNAPOLIS MD 21402
Titolo Testata:
Physical review. C. Nuclear physics
fascicolo: 5, volume: 57, anno: 1998,
pagine: 2264 - 2280
SICI:
0556-2813(1998)57:5<2264:SCONTG>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
INTERACTING-BOSON MODEL; MIXED-SYMMETRY STATES; LOW-LYING STATES; OCTUPOLE EXCITATIONS; NUCLEAR-STRUCTURE; CE-142; TRANSITIONS; ISOTOPES; BA-140; SM-146;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
43
Recensione:
Indirizzi per estratti:
Citazione:
S.F. Hicks et al., "STRUCTURAL CHARACTERISTICS OF ND-144 THROUGH GAMMA-RAY SPECTROSCOPY FOLLOWING INELASTIC NEUTRON-SCATTERING", Physical review. C. Nuclear physics, 57(5), 1998, pp. 2264-2280

Abstract

Excited levels in Nd-144 below 3.3 MeV have been studied using the (n,n' gamma) reaction. Electromagnetic transition probabilities, multipole-mixing and branching ratios, and level spins and parities were deduced from measured gamma-ray excitation functions, angular distributions, and Doppler shifts. Mixed-symmetry configurations in low-lying excited states were investigated by comparing experimental electromagnetictransition rates with theoretical calculations made using the interacting boson model and with existing calculations from the quasiparticlephonon model, the cluster vibrator model, and the particle-core coupling model. Fragmentation of the 2(+) mixed-symmetry mode is clearly observed through strong M1 transitions into the lowest symmetric 2(+) level and through small E2/M1 multipole-mixing ratios. Comparisons with similar measurements on Ce-142 reveal that these N=84 isotones exhibitstrong fragmentation of the mixed-symmetry mode, although it appears to be spread into more levels in Nd-144. Evidence is found to support the assignment of the 2779.0-keV level as the 3(-) member of the octupole-quadrupole phonon coupled quintuplet in Nd-144 and to propose thatthis excited mode is shared with the 2606.0-keV state. Two- and three-quadrupole phonon excitations, as well as other members of the quadrupole-octupole quintuplet, are also examined. [S0556-2813(98)06105-6].

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Documento generato il 01/12/20 alle ore 19:47:33