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Title: Systematic study of the fragmentation of low-lying dipole strength in odd-{ital A} rare earth nuclei investigated in nuclear resonance fluorescence experiments

Abstract

Nuclear resonance fluorescence experiments were performed on the rare earth nuclei {sup 155}Gd and {sup 159}Tb to study the fragmentation of the {ital M}1 {ital scissors} {ital mode} in {ital odd} deformed nuclei and to establish a kind of systematics. Using the bremsstrahlung photon beam of the Stuttgart Dynamitron (end point energy 4.1 MeV) and high resolution Ge-{gamma} spectrometers detailed information was obtained on excitation energies, decay widths, transition probabilities, and branching ratios. The results are compared to those observed recently for the neighboring odd nuclei {sup 161,163}Dy and {sup 157}Gd. Whereas in the odd Dy isotopes the dipole strength is rather concentrated, both Gd isotopes show a strong fragmentation of the strength into about 25 ({sup 155}Gd) and 90 transitions ({sup 157}Gd) in the energy range 2{endash}4 MeV. The nucleus {sup 159}Tb linking the odd Dy and Gd isotopes exhibits an intermediate strength fragmentation. In general the observed total strength in the odd nuclei is reduced by a factor of 2{endash}3 as compared to their neighboring even-even isotopes. The different fragmentation behavior of the dipole strengths in the odd Dy and Gd isotopes is unexplained up to now. {copyright} {ital 1996 The American Physical Society.}

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Institut fuer Strahlenphysik, Universitaet Stuttgart, Allmandring 3, D-70569 Stuttgart (Germany)
Publication Date:
OSTI Identifier:
390333
Resource Type:
Journal Article
Journal Name:
Physical Review, C
Additional Journal Information:
Journal Volume: 54; Journal Issue: 5; Other Information: PBD: Nov 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; GADOLINIUM 155; FRAGMENTATION; TERBIUM 159; RARE EARTH NUCLEI; DIPOLES; RESONANCE; FLUORESCENCE; DEFORMED NUCLEI; BREMSSTRAHLUNG; DYNAMITRONS; PHOTON BEAMS; GAMMA SPECTROMETERS; EXCITATION; WIDTH; BRANCHING RATIO; DYSPROSIUM ISOTOPES

Citation Formats

Nord, A, Schiller, A, Eckert, T, Beck, O, Besserer, J, von Brentano, P, Fischer, R, Herzberg, R, Jaeger, D, Kneissl, U, Margraf, J, Maser, H, Pietralla, N, Pitz, H H, Rittner, M, Zilges, A, and Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln. Systematic study of the fragmentation of low-lying dipole strength in odd-{ital A} rare earth nuclei investigated in nuclear resonance fluorescence experiments. United States: N. p., 1996. Web. doi:10.1103/PhysRevC.54.2287.
Nord, A, Schiller, A, Eckert, T, Beck, O, Besserer, J, von Brentano, P, Fischer, R, Herzberg, R, Jaeger, D, Kneissl, U, Margraf, J, Maser, H, Pietralla, N, Pitz, H H, Rittner, M, Zilges, A, & Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln. Systematic study of the fragmentation of low-lying dipole strength in odd-{ital A} rare earth nuclei investigated in nuclear resonance fluorescence experiments. United States. doi:10.1103/PhysRevC.54.2287.
Nord, A, Schiller, A, Eckert, T, Beck, O, Besserer, J, von Brentano, P, Fischer, R, Herzberg, R, Jaeger, D, Kneissl, U, Margraf, J, Maser, H, Pietralla, N, Pitz, H H, Rittner, M, Zilges, A, and Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln. Fri . "Systematic study of the fragmentation of low-lying dipole strength in odd-{ital A} rare earth nuclei investigated in nuclear resonance fluorescence experiments". United States. doi:10.1103/PhysRevC.54.2287.
@article{osti_390333,
title = {Systematic study of the fragmentation of low-lying dipole strength in odd-{ital A} rare earth nuclei investigated in nuclear resonance fluorescence experiments},
author = {Nord, A and Schiller, A and Eckert, T and Beck, O and Besserer, J and von Brentano, P and Fischer, R and Herzberg, R and Jaeger, D and Kneissl, U and Margraf, J and Maser, H and Pietralla, N and Pitz, H H and Rittner, M and Zilges, A and Institut fuer Kernphysik, Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln},
abstractNote = {Nuclear resonance fluorescence experiments were performed on the rare earth nuclei {sup 155}Gd and {sup 159}Tb to study the fragmentation of the {ital M}1 {ital scissors} {ital mode} in {ital odd} deformed nuclei and to establish a kind of systematics. Using the bremsstrahlung photon beam of the Stuttgart Dynamitron (end point energy 4.1 MeV) and high resolution Ge-{gamma} spectrometers detailed information was obtained on excitation energies, decay widths, transition probabilities, and branching ratios. The results are compared to those observed recently for the neighboring odd nuclei {sup 161,163}Dy and {sup 157}Gd. Whereas in the odd Dy isotopes the dipole strength is rather concentrated, both Gd isotopes show a strong fragmentation of the strength into about 25 ({sup 155}Gd) and 90 transitions ({sup 157}Gd) in the energy range 2{endash}4 MeV. The nucleus {sup 159}Tb linking the odd Dy and Gd isotopes exhibits an intermediate strength fragmentation. In general the observed total strength in the odd nuclei is reduced by a factor of 2{endash}3 as compared to their neighboring even-even isotopes. The different fragmentation behavior of the dipole strengths in the odd Dy and Gd isotopes is unexplained up to now. {copyright} {ital 1996 The American Physical Society.}},
doi = {10.1103/PhysRevC.54.2287},
journal = {Physical Review, C},
number = 5,
volume = 54,
place = {United States},
year = {1996},
month = {11}
}