Coexistence of superfluid and rigid moments of inertia in 76,78Kr

Kaplan, M.; Saladin, J. X.; Faro, L. de; Winchell, D. F.; Takai, H.; Knott, C. N.

doi:10.1016/0370-2693(88)91429-3

Cited by 29 publications

(13 citation statements)

References 19 publications

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“…To our knowledge, no 1 − state has yet been observed (see Data Base of the National Nuclear Data Center, BNL) below 2.9 MeV in even-even nuclei of this mass region (Z = 32-40). The present J π = 2 − assignment to the 2227 keV level supports the hypothesis [21,37,45] of negative parity and even spin for the band built on this state.…”

Section: Discussionsupporting

confidence: 72%

“…[21]; on the basis of calculations performed in the framework of the Woods-Saxon-Strutinsky cranking model these authors conclude that the band is most likely built on the π [431]3/2 + ⊗ π [312]3/2 − Nilsson states. They also found that the level at 2227 keV (for which they proposed J π = 2 − ) is the lowest state of a band previously observed to be based on the (4 − ) state, for which even spin and negative parity were suggested [21,45]. A two quasiparticle structure was considered also in this case as the most likely.…”

Section: B Negative-parity Statesmentioning

confidence: 94%

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Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
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The properties of the excited states of 76 Kr, populated in the decay of 76 Rb produced at ISOLDE isotopic separator, have been investigated by using K-conversion electron, γ -ray, and γ -γ coincidence measurements. The lifetimes of several levels have been measured by means of the advanced time-delayed βγ γ (t) method. The identification of 19 new levels and 55 transitions and the information deduced on spin and/or parity of the observed states from K-conversion coefficients, log ft values and decay properties have led to an improved knowledge of the level scheme. In particular, six 1 − states have been definitely identified and J π = 2 − has been assigned to the 2227 keV level, on which a band proposed to have negative-parity and even-spin had been previously observed. The strengths of the E0 and E2 transitions deexciting the 0

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Section: Discussionsupporting

confidence: 72%

Section: B Negative-parity Statesmentioning

confidence: 94%

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
View full text Add to dashboard Cite

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“…Indeed, experimental signals of octupole correlations in the 80 mass region have been reported [34][35][36].…”

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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“…However, one must expect the deviation at higher angular momentum because alignment occurs at spin 8 for these isotopes; see Refs. [14,15]. In order to compare the results with higher angular momentum states one has to consider the excitation of a pair of protons for these nuclei; see the approach of Refs.…”

Section: Methodsmentioning

confidence: 99%

“…In order to compare the results with higher angular momentum states one has to consider the excitation of a pair of protons for these nuclei; see the approach of Refs. [14,15]. The results of the calculation for the J =02 22 23 ) 3$ ) and 42 states are compared with the experimental data for Kr isotopes in Fig.…”

Section: Methodsmentioning

confidence: 99%

Structure of the even-even Kr isotopes within the interacting boson model

1995

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The Kr isotopes with A=72 to 84 are investigated within the interacting boson model (IBM-2) using two difFerent approaches. In the 6rst investigation the single-particle energies of the neutron and proton bosons are assumed equal, e = e"= e, whereas the second investigation is based on their being difFerent (e" f e ). The results of these calculations are compared with the experimental data and previous theoretical investigations. We also attempt to determine the shape transition in these nuclei.PACS number(s): 21.60. Fw, 23.20.Lv, 27.50.+e

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Coexistence of superfluid and rigid moments of inertia in 76,78Kr

Cited by 29 publications

References 19 publications

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
View full text Add to dashboard Cite

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
View full text Add to dashboard Cite

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Structure of the even-even Kr isotopes within the interacting boson model

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Coexistence of superfluid and rigid moments of inertia in 76,78Kr

Cited by 29 publications

References 19 publications

Spectroscopy and lifetime measurements of states inKr76populated inRb76Giannatiempo1, Perego2, Sona3 et al. 2005Phys. Rev. C192100View full textAdd to dashboardCite

Spectroscopy and lifetime measurements of states inKr76populated inRb76Giannatiempo1, Perego2, Sona3 et al. 2005Phys. Rev. C192100View full textAdd to dashboardCite

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Structure of the even-even Kr isotopes within the interacting boson model

Contact Info

Product

Resources

About

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
View full text Add to dashboard Cite

Spectroscopy and lifetime measurements of states inKr76populated inRb76
Giannatiempo
¹
,
Perego
²
,
Sona
³

et al. 2005
Phys. Rev. C
19
2
10
0
View full text Add to dashboard Cite