Multiple superdeformed bands in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Dy</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>153</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Johansson, J. K.; Andrews, H.R.; Bengtsson, T.; Djaafri, A.; Drake, T.E.; Flibotte, Stéphane; Galindo-Uribarri, A.; Hörn, D.; Janzen, V. P.; Kuehner, J. A.; Monaro, S.; Nadon, N.; Pilotte, S.; Prévost, D.; Radford, D. C.; Ragnarsson, I.; Taras, P.; Tehami, A.; Waddington, J. C.; Ward, D. R.; Åberg, Sven

doi:10.1103/physrevlett.63.2200

Cited by 58 publications

(24 citation statements)

References 17 publications

(2 reference statements)

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“…This nucleus may represent a double-closed shell for superdeformed shapes, or its central position may be only apparent While the zero-alignment position does depend on which of these bands is taken as reference, the main conclusions do not The incremental alignments of these eight bands are plotted in Fig. 7, where we have also included the excited (*) superdeformed bands, I53Dy* [21] and 151Tb*[l], referred to the band in 152Dy [22]. It is apparent that the data cluster around the lines drawn at± 1, ± 0.5, and 0, although almost all the values for bands in the mass-190 region decrease below frequencies of about 0.2 MeV, and the values for one 191Hg* band decrease at the highest frequencies.…”

Section: Datamentioning

confidence: 99%

Spin alignment in superdeformed rotational bands

Stephens

1990

Nuclear Physics A

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Section: Datamentioning

confidence: 99%

Spin alignment in superdeformed rotational bands

Stephens

1990

Nuclear Physics A

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“…Fits of the same quality are obtained with three parameters. Table 4 summarizes the results for the three superdeformed bands observed in lS3Dy [20] where even the two parameter calculation gives an impressive agreement. In order not to extend the volume of the tables too much, the numerical results presented in Tables 4-7 deal only with the three parameter fits.…”

Section: Other Applications In the A~ 150 Mass Regionmentioning

confidence: 67%

“…Second, the exclusion from the fit procedure of the lowest (and often less intense) Ee value improves the 33 [20] ~2 ~3Dy (HD) 1237.0 10 0.00124 0.00104 [39] agreement in a significant way in some specific cases (e. g. 13~ 136Nd, 149Gd (2) and (3), ~5~ (1)). This fact may be related with some structure change of the lowest levels of the superdeformed band where (at least part of) the decay out of band takes place.…”

Section: Discussionmentioning

confidence: 98%

Superfluid liquid model with triplet pairing for superdeformed bands inA?130?150 region

Piepenbring¹,

Протасов²

1993

Z. Physik A - Hadrons and Nuclei

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Abstract. The superfluid liquid model with triplet pairing is applied to the analysis of the superdeformed bands in A ~ 130-150 region. A two-parameter expression for the 7-transitions energies allows a description, good in the A ~ 150 region and rough for the A ~ 130 nuclei, of the experimental data. The introduction of the third parameter gives considerable (especially in the A~ 130 region) improvement of quality of the description close to or within experimental uncertainties. In this superfluid liquid model the appearance of the superdeformed bands is a consequence of the nuclear matter properties, rather than a shell model feature.

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“…This suggests that if the correlation does correspond to a bona fide band, then the band is too weak to be observed in a 1-dimensional spectrum projected from the 7-3' coincidence data. As a comparison, the weaker of the two excited superdeformed bands in 153Dy [5] was estimated to have ,--0.13% of the total channel intensity. It was located by BANDAID in 7-7 data, and was confirmed in the analysis of 7-7-7 coincidences.…”

Section: Pacsmentioning

confidence: 99%

Superdeformation in144Eu

Mullins

Hackman

Galindo-Uribarri

et al. 1993

Z. Physik A - Hadrons and Nuclei

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A ridge has been found in a 7-7 coincidence matriz obtained from the reaction 122Sn (27 A1,5n)144Eu at 142 MeV. The half-width of the valley is ~59 keV, which is similar to the energy spacings in the superdeformed bands in 143Eu and 142Sm. This indicates She ezistence of superdeformed bands in 144Eu. 27.60.+j, 23.20.Lv, 21.10.Re, 21.60.Ev Superdeformed bands have recently been observed in the N = 80 nuclei 143Eu [1, 2] and 14~Sm [3]. These two cases lie intermediate between the "highly" deformed A = 135 region and the heavier region centred around A = 150 where nuclei with a superdeformed 2:1 shape are found. The observation of these bands agrees well with Total Routhian Surface (TRS) calculations, which predict N = 80 to be a particularly favoured neutron number. A glaring problem is the failure by many groups to observe superdeformation in the next N = 80 isotone, 144Gd, which is predicted to be a more favourable case than 142Sm. Theory also predicts that the energy spacing may not be regular in 144Gd, and this may account, at least in part, for the null results in 144Gd. It is clearly pertinent to ask whether or not superdeformed bands exist only in nuclei with N = 80 in this "bridging" region. This note reports on our findings in the odd-odd neighbour to 143Eu, 144Eu. PACS:A beam of 2rA1 ions was provided at an energy of 142 MeV by the upgraded MP tandem accelerator of the TASCC facility at the Chalk River Laboratories of AECL Research. The target consisted of two --~500#g/cm ~ foils enriched to ~98% in 122Sn. States in 144Eu were reached via the 5n exit channel in which the entry conditions were suitable for populating superdeformed bands. 7-7 coincidences were collected with the 87r spectrometer, which comprises twenty Compton suppressed HpGe detectors, and a seventy-one element BGO inner calorimeter from which fold/sum-energy (K/H) information was obtained. The data were written event-by-event onto magnetic tape for subsequent analysis. Finally, 152Eu and 133Ba sources were placed at the target position for the purpose of energy and relative efficiency calibration of the HpGe detectors.In the replay of the data, the BGO-ball was used to select events that had a minimum sum-energy of H > 19.6 MeV. This matrix contained 280 million events, in which 144Eu was approximately 2.5 times stronger than either 143Eu or 145Eu. The matrix was symmetrized and searched for superdeformed bands with established techniques. No evidence could be found for the superdeformed band in ~43Eu. A weak 2-dimensional ridge was observed in this matrix. A 1-dimensional projection taken from a background-subtracted matrix perpendicular to the diagonal over the energy range 950-to-1350 keV is shown in figure 1. Contributions from contaminating discrete-line coincidences have been excluded by examination of the total projection of the data parallel to the diagonal. The half-width of the valley is ~59 keV, and remains constant at this value to within -4-2 keV over the entire length of the ridge. This is similar to the spacing...

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Multiple superdeformed bands inDy153

Cited by 58 publications

References 17 publications

Spin alignment in superdeformed rotational bands

Spin alignment in superdeformed rotational bands

Superfluid liquid model with triplet pairing for superdeformed bands inA?130?150 region

Superdeformation in144Eu

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