Collective E1 transitions in even-A Ra, Th, and U nuclei

Ackermann, B.; Baltzer, H.; Ensel, C.; Freitag, Κ.; Grafen, V.; Günther, C.; Herzog, P.; Manns, J.; Marten-Tölle, M.; Müller, U.; Prinz, Janosch; Romanski, I.; Tölle, R.; deBoer, J.; Gollwitzer, N.; Maier, H.

doi:10.1016/0375-9474(93)90180-6

Cited by 62 publications

(38 citation statements)

References 19 publications

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“…6), the magnitudes |D 0 | of the electric dipole moments of Ra, Th, and U nuclei, averaged over high-spin values (typically I > 7) are compared as a function of neutron number. Our value of |D 0 | for 230 U is in good agreement with the tentative value obtained by Ackermann et al [12]. In the same figure, we have also plotted the value of the staggering function …”

supporting

confidence: 91%

“…2. The ground-state bands of both nuclei have been extended in spin by two transitions compared to the earlier works [11,12]. In 232 U, the negative-parity sequence has also been extended by four units of spin and, more importantly, the in-band E2 transitions have been identified for the first time.…”

mentioning

confidence: 68%

“…This leaves the actinide region as the next frontier. Of particular interest are [230][231][232][233][234] U, as it is in the lowest-lying, negative-parity bands of these nuclei in which, with the exception of some tentative lines in 230 U, no in-band E2 transitions have as yet been observed [11,12].…”

mentioning

confidence: 99%

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Electric dipole moments inU230,232and implications for tetrahedral shapes

Ntshangase¹,

Bark²,

Aschman³

et al. 2010

Phys. Rev. C

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The nuclei 230 U and 232 U were populated in the compound nucleus reactions 232 Th(α,6n) and 232 Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. A comprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232 U while one E2 transition was also observed for 230 U. These allowed B(E1; I − → I + − 1)/B(E2; I − → I − − 2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q 2 values for the isotone 226 Ra.

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supporting

confidence: 91%

mentioning

confidence: 68%

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Electric dipole moments inU230,232and implications for tetrahedral shapes

Ntshangase¹,

Bark²,

Aschman³

et al. 2010

Phys. Rev. C

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“…To study the octupole correlations in 78 Br, the experimental BðE1Þ=BðE2Þ branching ratios and the energy displacement δE between the positive-parity band 1 and the negative-parity band 3 in 78 Br are extracted and compared with those in 125 Ba [62] and 224 Th [63] in Fig. 5.…”

mentioning

confidence: 99%

“…The positive-and negative-parity bands connected by E1 transitions in 125 Ba are based on different configurations and have been interpreted as octupole correlations [62]. The alternatingparity band in 224 Th was reported to have stable octupole deformation [63]. In Fig.…”

mentioning

confidence: 99%

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Liu¹,

Wang²,

Bark³

et al. 2016

Phys. Rev. Lett.

106

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Two pairs of positive-and negative-parity doublet bands together with eight strong electric dipole transitions linking their yrast positive-and negative-parity bands have been identified in 78 Br. They are interpreted as multiple chiral doublet bands with octupole correlations, which is supported by the microscopic multidimensionally-constrained covariant density functional theory and triaxial particle rotor model calculations. This observation reports the first example of chiral geometry in octupole soft nuclei. DOI: 10.1103/PhysRevLett.116.112501 Spontaneous symmetry breaking is a fundamental concept in nature. As a many-body quantum system, the atomic nucleus carries a wealth of information on fundamental symmetries and symmetry breaking. As one example, chiral symmetry breaking in atomic nuclei has attracted considerable attention and intensive discussion since it was first predicted by Frauendorf and Meng [1]. They pointed out that, in the intrinsic frame of the rotating triaxial nucleus, the total angular momentum vector may lie outside the three principal planes, referred to as chiral geometry. The spontaneous chiral symmetry breaking in the laboratory frame may give rise to pairs of nearly degenerate ΔI ¼ 1 bands with the same parity, i.e., chiral doublet bands. Such chiral doublet bands were first observed in N ¼ 75 isotones [2]. So far, more than 30 experimental candidates have been reported in the A ∼ 80, 100, 130, and 190 mass regions [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].Based on constrained triaxial covariant density functional theory (CDFT) calculations, it has been suggested that multiple chiral doublet (MχD) bands can exist in a single nucleus [21][22][23][24][25][26]. The theoretical prediction of MχD bands stimulated lots of experimental efforts [27][28][29][30][31]. The first experimental evidence for MχD bands was reported in 133 Ce [27], which confirmed the manifestation of triaxial shape coexistence in this nucleus. Later, Kuti et al. reported a novel type of MχD bands with the same configuration in 103 Rh [29], which showed that chiral geometry can be robust against the increase of the intrinsic excitation energy.Compared to the A ∼ 130 and 100 mass regions, the A ∼ 80 mass region is a relatively new and less studied territory for the investigation of chiral symmetry breaking in rotating nuclei, with only one report of chiral doublet bands based on the πg 9=2 ⊗ νg 9=2 configuration in odd-odd 80 Br [18]. In 78 Br, the πg 9=2 ⊗ νg 9=2 band was suggested to have an obvious triaxial shape [32], which is suitable for the construction of chiral doublet bands.

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Tunneling Through Triple-Humped Fission Barriers

Krasznahorkay

2011

Handbook of Nuclear Chemistry

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Collective E1 transitions in even-A Ra, Th, and U nuclei

Cited by 62 publications

References 19 publications

Electric dipole moments inU230,232and implications for tetrahedral shapes

Electric dipole moments inU230,232and implications for tetrahedral shapes

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Tunneling Through Triple-Humped Fission Barriers

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