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Titolo:
ISOVECTOR QUADRUPOLE EXCITATIONS IN THE VALENCE SHELL OF THE VIBRATORNUCLEUS BA-136 - EVIDENCE FROM PHOTON SCATTERING EXPERIMENTS
Autore:
PIETRALLA N; BELIC D; VONBRENTANO P; FRANSEN C; HERZBERG RD; KNEISSL U; MASER H; MATSCHINSKY P; NORD A; OTSUKA T; PITZ HH; WERNER V; WIEDENHOVER I;
Indirizzi:
UNIV COLOGNE,INST KERNPHYS D-50937 COLOGNE GERMANY UNIV STUTTGART,INST STRAHLENPHYS D-70569 STUTTGART GERMANY UNIV TOKYO,DEPT PHYS,BUNKYO KU TOKYO 113 JAPAN
Titolo Testata:
Physical review. C. Nuclear physics
fascicolo: 2, volume: 58, anno: 1998,
pagine: 796 - 800
SICI:
0556-2813(1998)58:2<796:IQEITV>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
MIXED-SYMMETRY STATES; INTERACTING-BOSON MODEL; GAMMA-SOFT NUCLEUS; RESONANCE FLUORESCENCE; COLLECTIVE MODES; SCISSORS MODE; STRENGTH; PROTON; ND-144; CE-142;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
N. Pietralla et al., "ISOVECTOR QUADRUPOLE EXCITATIONS IN THE VALENCE SHELL OF THE VIBRATORNUCLEUS BA-136 - EVIDENCE FROM PHOTON SCATTERING EXPERIMENTS", Physical review. C. Nuclear physics, 58(2), 1998, pp. 796-800

Abstract

Photon scattering experiments, have been performed on the nucleus Ba-136 with photon energies of E gamma less than or equal to 4.1 MeV and E(gamma)less than or equal to 2.8 MeV. At 2.1 MeV clear evidence for the 2(ms)(+), State has been found. From the measured lifetime we extract signatures for the isovector quadrupole excitation in the valence shell: a weakly collective E2 decay to the ground state and a strong M1decay to the 2(1)(+) state. As the resonant photon scattering with bremsstrahlung is a complete reaction, we can conclude that the 2(+) state at 2129 keV is a rather pure 2(ms)(+) state with little fragmentation. This is in contrast to the 1(+) scissors state. A comparison with an IBM-2 calculation is given.

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Documento generato il 01/12/20 alle ore 19:14:29