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Title: Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape

Abstract

Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of {sup 70}Se ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation {gamma} rays in the highly segmented MINIBALL {gamma}-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2{sup +} state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2{sup +} state in {sup 70}Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.

Authors:
; ; ; ;  [1];  [1];  [2]; ; ; ; ;  [3]; ; ; ; ; ; ;  [4]; more »;  [5] « less
  1. Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE (United Kingdom)
  2. (Switzerland)
  3. Department of Physics, University of York, York YO10 5DD (United Kingdom)
  4. ISOLDE, CERN, CH-1211 Geneva 23 (Switzerland)
  5. Physik Department E12, Technische Universitaet Muenchen, 85748 Garching (Germany) (and others)
Publication Date:
OSTI Identifier:
20955466
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevLett.98.072501; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ATOMIC IONS; COULOMB EXCITATION; DE-EXCITATION; GAMMA RADIATION; GAMMA SPECTROMETERS; GROUND STATES; MEV RANGE 100-1000; MOLECULAR IONS; QUADRUPOLE MOMENTS; SELENIUM 70; SI SEMICONDUCTOR DETECTORS

Citation Formats

Hurst, A. M., Herzberg, R.-D., Jones, G. D., Paul, E. S., Petri, M., Butler, P. A., ISOLDE, CERN, CH-1211 Geneva 23, Jenkins, D. G., Barton, C. J., Kent, P., Steer, A., Wadsworth, R., Delahaye, P., Wenander, F., Ames, F., Franchoo, S., Georgiev, G., Koester, U., Sieber, T., Behrens, T., and Kroell, T. Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.072501.
Hurst, A. M., Herzberg, R.-D., Jones, G. D., Paul, E. S., Petri, M., Butler, P. A., ISOLDE, CERN, CH-1211 Geneva 23, Jenkins, D. G., Barton, C. J., Kent, P., Steer, A., Wadsworth, R., Delahaye, P., Wenander, F., Ames, F., Franchoo, S., Georgiev, G., Koester, U., Sieber, T., Behrens, T., & Kroell, T. Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape. United States. doi:10.1103/PHYSREVLETT.98.072501.
Hurst, A. M., Herzberg, R.-D., Jones, G. D., Paul, E. S., Petri, M., Butler, P. A., ISOLDE, CERN, CH-1211 Geneva 23, Jenkins, D. G., Barton, C. J., Kent, P., Steer, A., Wadsworth, R., Delahaye, P., Wenander, F., Ames, F., Franchoo, S., Georgiev, G., Koester, U., Sieber, T., Behrens, T., and Kroell, T. Fri . "Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape". United States. doi:10.1103/PHYSREVLETT.98.072501.
@article{osti_20955466,
title = {Measurement of the Sign of the Spectroscopic Quadrupole Moment for the 2{sub 1}{sup +} State in {sup 70}Se: No Evidence for Oblate Shape},
author = {Hurst, A. M. and Herzberg, R.-D. and Jones, G. D. and Paul, E. S. and Petri, M. and Butler, P. A. and ISOLDE, CERN, CH-1211 Geneva 23 and Jenkins, D. G. and Barton, C. J. and Kent, P. and Steer, A. and Wadsworth, R. and Delahaye, P. and Wenander, F. and Ames, F. and Franchoo, S. and Georgiev, G. and Koester, U. and Sieber, T. and Behrens, T. and Kroell, T.},
abstractNote = {Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of {sup 70}Se ions was postaccelerated to an energy of 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the beam and target nuclei were deduced by recording deexcitation {gamma} rays in the highly segmented MINIBALL {gamma}-ray spectrometer in coincidence with scattered particles in a silicon detector. At these energies, the Coulomb-excitation yield for the first 2{sup +} state is expected to be strongly sensitive to the sign of the spectroscopic quadrupole moment through the nuclear reorientation effect. Experimental evidence is presented here for a prolate shape for the first 2{sup +} state in {sup 70}Se, reopening the question over whether there are, as reported earlier, deformed oblate shapes near to the ground state in the light selenium isotopes.},
doi = {10.1103/PHYSREVLETT.98.072501},
journal = {Physical Review Letters},
number = 7,
volume = 98,
place = {United States},
year = {Fri Feb 16 00:00:00 EST 2007},
month = {Fri Feb 16 00:00:00 EST 2007}
}