B. Cederwall
Lawrence Berkeley National Laboratory
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Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 1995
B. Cederwall; I. Y. Lee; S. J. Asztalos; M. J. Brinkman; J. A. Becker; R. M. Clark; M.-A. Deleplanque; R. M. Diamond; P. Fallon; L. P. Farris; E. A. Henry; J.R. Hughes; A. O. Macchiavelli; F. S. Stephens
A method for correcting target-thickness-induced Doppler broadening in gamma-ray spectra from weakly populated, very short-lived (femtosecond) states is presented. The method is illustrated by an a ...
Physics Letters B | 1995
D. R. Lafosse; P.-F. Hua; D. G. Sarantites; C. Baktash; Y.A. Akovali; M. Brinkman; B. Cederwall; F. Cristancho; J. Döring; C. J. Gross; H.-Q. Jin; M. Korolija; Eduardo Landulfo; I. Y. Lee; A. O. Macchiavelli; M.R. Maier; W. Rathbun; J.X. Saladin; D. W. Stracener; S. L. Tabor; A. Vander Mollen; T.R. Werner
Abstract The recently discovered superdeformed band in one of the strontium isotopes has been identified as belonging to 83Sr from a study with the Gammasphere array and the Microball charged-particle detector system. From its decay pattern, a spin of (81 ± 2) 2 h is deduced for the highest level of this band. Evidence for very fast transition rates and agreement of the characteristics of this band with the theoretical predictions establish the yrast superdeformed nature of this band in 83Sr.
Physics Letters B | 1995
F. Cristancho; D. R. Lafosse; C. Baktash; D. F. Winchell; B. Cederwall; J. Döring; C. J. Gross; P.-F. Hua; H.-Q. Jin; M. Korolija; Eduardo Landulfo; I. Y. Lee; Augusto Macchiavelli; M.R. Maier; W. Rathbun; J.X. Saladin; D. G. Sarantites; D. W. Stracener; S. L. Tabor; A. Vander Mollen; T.R. Werner
Abstract Four superdeformed bands extending over five to twelve transitions have been identified in 81 Sr from a study with the Gammasphere array and the Microball charged-particle array. One of the bands shows an upbend in the dynamic moment of inertia at a rotational frequency of 1.2 MeV and all bands exhibit a nearly constant moment of inertia below that frequency.
Physics Letters B | 1995
D. Nisius; R. V. F. Janssens; P. Fallon; B. Crowell; I. Ahmad; C. W. Beausang; M. P. Carpenter; B. Cederwall; P. J. Daly; M.-A. Deleplanque; R. M. Diamond; D. Gassmann; Z. W. Grabowski; R.G. Henry; T. L. Khoo; T. Lauritsen; I. Y. Lee; A. O. Macchiavelli; R. H. Mayer; F. S. Stephens; P.J. Twin
One of the four new excited superdeformed bands found in Dy-151 is characterized by transition energies that lie midway between the gamma-ray energies of the yrast superdeformed band in Dy-152. Thi ...
Physics Letters B | 1995
B. Cederwall; Greg Hackman; A. Galindo-Uribarri; D.C. Radford; J. A. Becker; M. J. Brinkman; M.-A. Deleplanque; R. M. Diamond; J. E. Draper; C. Duyar; P. Fallon; L. P. Farris; E. A. Henry; J.R. Hughes; I. Y. Lee; A. O. Macchiavelli; S. M. Mullins; E. Rubel; F. S. Stephens; M.A. Stoyer; J. C. Waddington
Two new superdeformed (SD) bands in Dy-153, in addition to the three previously observed, have been studied with the GAMMASPHERE detector array. Assignments to single-neutron orbits in the SD potential are made based on the band properties. Evidence for a band interaction at very high spins, possibly involving the first N = 7 proton intruder orbital, is observed in the strongest populated SD band. Furthermore, evidence far a Delta I = 2 staggering is also found in this SD band.
Physical Review C | 1994
J. R. B. Oliveira; S. Frauendorf; M.-A. Deleplanque; B. Cederwall; R. M. Diamond; A. O. Macchiavelli; F. S. Stephens; J. Burde; J. E. Draper; C. Duyar; E. Rubel; J. A. Becker; E. A. Henry; M. J. Brinkman; A. Kuhnert; M. A. Stoyer; T.-F. Wang
High-[ital K] bands have been observed in the [sup 166,167,168]Yb isotopes following the [sup 124]Sn([sup 48]Ca,[ital xn][gamma]) reaction. The [nu][ital h][sub 11/2] band in [sup 167]Yb has been extended to higher spins. The high-[ital K] bands in the even-even isotopes were observed for the first time and show very high [ital B]([ital M]1)/[ital B]([ital E]2) ratios. Configuration assignments for the new bands are proposed. The results are interpreted within the Tilted Cranking model.
Physical Review C | 1994
J. R. B. Oliveira; S. Frauendorf; Deleplanque; B. Cederwall; R. M. Diamond; A. O. Macchiavelli; F. S. Stephens; J. Burde; J. E. Draper; C. Duyar; E. Rubel; J. A. Becker; E. A. Henry; M. J. Brinkman; A. Kuhnert; Stoyer; T.-F. Wang
High-[ital K] bands have been observed in the [sup 166,167,168]Yb isotopes following the [sup 124]Sn([sup 48]Ca,[ital xn][gamma]) reaction. The [nu][ital h][sub 11/2] band in [sup 167]Yb has been extended to higher spins. The high-[ital K] bands in the even-even isotopes were observed for the first time and show very high [ital B]([ital M]1)/[ital B]([ital E]2) ratios. Configuration assignments for the new bands are proposed. The results are interpreted within the Tilted Cranking model.
Physics Letters B | 1995
R. M. Clark; M.-A. Deleplanque; B. Cederwall; R. M. Diamond; P. Fallon; I. Y. Lee; A. O. Macchiavelli; F. S. Stephens; J. A. Becker; M. J. Brinkman; L. P. Farris; E. A. Henry; J.R. Hughes; M. A. Stoyer; J. E. Draper; C. Duyar; E. Rubel; H. Hübel; W. Korten; P. Willsau
Abstract High-spin states in 136Nd were populated via the 100Mo(40Ar, 4n) reaction at beam energies of 176 and 182 MeV, and resulting γ-rays were detected using the GAMMASPHERE spectrometer. Analysis of the data has revealed the existence of an excited superdeformed (SD) band in 136Nd. The yrast SD band in 136Nd has been extended by the addition of four (possibly five) transitions at high frequency. The new band displays the remarkable property of having transition energies identical (to within ± 1 keV) to those of the half-points of the yrast SD band of 136Nd. Possible explanations in terms of cranked Woods-Saxon single-particle calculations are discussed.
Physical Review C | 1993
B. Cederwall; M.-A. Deleplanque; F. Azaiez; R. M. Diamond; P. Fallon; W. Korten; I. Y. Lee; A. O. Macchiavelli; J. R. B. Oliveira; F. S. Stephens; W. H. Kelly; Vo Dt; J. A. Becker; M. J. Brinkman; E. A. Henry; J.R. Hughes; A. Kuhnert; Stoyer; T.-F. Wang; J. E. Draper; C. Duyar; E. Rubel; J. DeBoer
High-spin states in the nucleus [sup 196]Hg were populated in the reaction [sup 192]Os([sup 9]Be,5[ital n]) at a beam energy of 65 MeV. A regular rotational-like [Delta][ital I]=1 band has been observed up to an excitation energy of [ital E][sup *][approx]8.7 MeV and spin [ital I][approx]30[h bar]. This is the second observation of a band of this character in a mercury isotope. The experimental results are compared with mean field calculations and semiclassical estimates based on the Doenau-Frauendorf formalism. The mercury bands show significantly lower [ital B]([ital M]1)/[ital B]([ital E]2) branching ratios as compared with similar bands in light lead nuclei. This difference may be more readily explained by a difference in single-particle structure rather than by large differences in deformation between the lead and mercury configurations.
Physics Letters B | 1998
Cornelius Beausang; P. Fallon; D. E. Appelbe; S Aztalos; R. M. Clark; S. Clarke; B. Cederwall; M.-A. Deleplanque; R. M. Diamond; S Erturk; Warren H. Kelly; I. Y. Lee; A O Macchaivelli; D C Patterson; M B Smith; F. S. Stephens; P J Twin; A N Wilson
The quadrupole moments and deformations have been measured for six superdeformed bands in Gd-150. The results indicate evidence for deformation driving properties of both the high-hi intruder and a ...
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