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Journal ArticleDOI

Collective band structures in the gamma -soft nucleus 135Nd.

01 Mar 1987-Physical Review C (Phys Rev C Nucl Phys)-Vol. 35, Iss: 3, pp 959-967
TL;DR: In this paper, two distinct high-spin structures have been identified: the first is based on the alignment of a pair of h/sub 11/2/ protons, and the second is a 3-quasiparticle configuration with no signature splitting.
Abstract: The low-lying band structure of /sup 135/Nd has been extended to higher spins using the /sup 112/Cd(/sup 27/Al,p3n..gamma..)/sup 135/Nd and /sup 116/Sn(/sup 24/Mg,2p3n..gamma..)/sup 135/Nd reactions. Two distinct high-spin structures have been identified. The ..delta..J = 1 band built on the ..nu..h/sub 11/2/(514)(9/2)/sup -/ ground state was observed to have a band crossing at J/sup ..pi../ = (25/2)/sup -/. This band crossing is associated with a loss of the moderate signature splitting found below the backbend. Cranked-shell model calculations suggest that this structure involves the alignment of a pair of h/sub 11/2/ protons and that the loss of signature splitting can be attributed to a shape change from a triaxial shape at low spins to a prolate axial shape above the backbend. A second ..delta..J = 1 band structure with no signature splitting was observed to be built on a J/sup ..pi../ = (17/2)/sup (+)/ state at 1954 keV. Values for the ratios of reduced transition rates B(M1; I ..-->..I-1)/B(E2; I..-->..I-1) and B(M1; I..-->..I-1)/B(E2; I..-->..I-2) have been extracted from transitions in the two bands. Comparisons with theoretical predictions helped in the identification of the structure of the second ..delta..J = 1 band, which is thought to be based on a ..nu..h/submore » 11/2/x..pi..h/sub 11/2/x..pi..g/sub 7/2/ three-quasiparticle configuration.« less
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Journal ArticleDOI
TL;DR: One new pair of positive-parity chiral doublet bands have been identified in the odd-A nucleus Nd-135 as mentioned in this paper, which together with the previously reported negative-Parity chirithmic doublet band constitute a t...
Abstract: One new pair of positive-parity chiral doublet bands have been identified in the odd-A nucleus Nd-135 which together with the previously reported negative-parity chiral doublet bands constitute a t ...

20 citations

Journal ArticleDOI
TL;DR: In this paper, A=135 (Nuclear Data Sheets 14, 191 (1975)) was updated with a new version of A=136 (A=135) for the first time.

16 citations

Journal ArticleDOI
TL;DR: In this paper, the negative-parity sidebands in the yrast and negative parity sideband in both nuclei have been studied and the possible structures for these bands are discussed.
Abstract: High spin states have been populated in 132,134Nd using the 104Pd(32S,2p2n)132Nd and 104Ru(34S,4n)134Nd reactions at 152 and 150 meV respectively. Several new states have been observed in both the yrast and negative-parity sidebands in these nuclei, In 132Nd a new band, probably built on a four-quasiparticle configuration, has been observed to feed into the yrast band at spin 10+. The present work focuses attention on the negative-parity sidebands in both nuclei. These are expected to have a proton structure based on a pi h11/2(X) pi g7/2 configuration. However, the bands display anomalously low crossing frequencies for the expected alignment of the second and third h11/2 protons (BC crossing). The possible structures for these bands are discussed.

12 citations

Journal ArticleDOI
TL;DR: In this article, high-spin states were populated in the reaction with beam energies of 170 and 184 MeV in two separate experiments, and over 140 new transitions were placed in a level scheme that consists of four rotational structures, three of which have been observed for the first time.
Abstract: High-spin states in ${}^{129}\mathrm{Nd}$ were populated in the reaction ${}^{92}\mathrm{Mo}{(}^{40}\mathrm{Ca},2pn)$ with beam energies of 170 and 184 MeV in two separate experiments. Over 140 new transitions were placed in a level scheme that consists of four rotational structures, three of which have been observed for the first time. The bands were assigned configurations based on their $B(M1)/B(E2)$ ratios (for the strongly coupled bands), aligned angular momentum, observed band crossings, and signature splitting. Evidence for of the observation of the deformation driving $\ensuremath{ u}{i}_{13/2}[660]1/2$ orbital is presented. Signature splitting trends in the $\ensuremath{ u}{h}_{11/2}$ bands of $A\ensuremath{\sim}130$ nuclei are investigated within the framework of the cranked shell model. Comparisons are made with observations in the $\ensuremath{\pi}{h}_{11/2}$ bands near $A\ensuremath{\sim}160.$

11 citations

Journal ArticleDOI

10 citations