Study of short-lived bromine isotopes

Prinz, Janosch; Berkes, István; Herzog, P.; Hlimi, B.; Jésus, M. de; Massaq, M.; Romanski, I.

doi:10.1007/bf02398983

Hyperfine Interact

1992

DOI: 10.1007/bf02398983

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Study of short-lived bromine isotopes

Janosch Prinz¹,

István Berkes²,

P. Herzog³

et al.

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1993

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Cited by 7 publications

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“…1, with five bands labeled as 1-5. Prior to the present work, the ground state of 78 Br was assigned I π ¼ 1 þ with the πp 3=2 ⊗ νp 1=2 configuration [43,44]. Three isomeric states (2 − at 32.3 keV, 4 þ at 180.9 keV, and 5 ðþÞ at 227.7 keV) have been reported in Refs.…”

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confidence: 99%

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Liu¹,

Wang²,

Bark³

et al. 2016

Phys. Rev. Lett.

107

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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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mentioning

confidence: 99%

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Liu¹,

Wang²,

Bark³

et al. 2016

Phys. Rev. Lett.

107

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“…Thus direct information on the neutron-number dependence of the nuclear deformation in the bromine chain-as normally obtained from LS measurements of mean square radii and nuclear electric quadrupole moments-is not available. Concerning the ground-state properties of neutron-deficient Br isotopes, only the magnetic moments are known experimentally from nuclear orientation (NO) [16] and nuclear magnetic resonance on oriented nuclei (NMR-ON) measurements [17,18]. From these measurements Griffiths et al drew the conclusion that their results pointed to a gradual increase in nuclear ground-state deformation from b 2 0.20, g 0 in 81 Br to b 2 0.33, g 0 in 75 Br [16].…”

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confidence: 99%

Drastic Increase of the Nuclear Deformation in Bromine betweenA=79and 77

et al. 1998

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The electric quadrupole interaction frequencies eQV zz The study of nuclear properties in long isotopic and isotonic chains has been the subject of many investigations, both experimental and theoretical [1], the main source of information on nuclear ground state properties being optical spectroscopy [2]. Such investigations revealed that the nuclear shape may change drastically between two nuclei which differ only by one or two nucleons. It was first observed with 80 Hg, for which a drastic change in the mean square charge radius was found between 187 Hg and 185 Hg [3]. This phenomenon was explained by nearly degenerate nuclear states of different shape and is now usually denoted as "shape coexistence." As N changes for a given Z or vice versa strong competition can occur between the different forces which separately drive the nucleus towards prolate, oblate, triaxial, and spherical shapes. For 80 Hg, 79 Au, and 78 Pt-these elements are just below the Z 82 shell closure-, the neutron-rich nuclei are weakly deformed with oblate shapes, whereas the neutron-deficient isotopes are strongly deformed with prolate shapes [4][5][6]. For Hg and Au the shape transition is sharp [4,7], whereas it is smooth for Pt [6]. Meanwhile it is generally adopted that the phenomenon of shape coexistence exists in many regions of the nuclear chart [1]. One of these is the region just below the Z 40 shell closure, which has been studied extensively meanwhile [8]. In the isotopic chains of 38 Sr, 37 Rb, and 36 Kr the nuclear shape changes from nearly spherical around N 50 ( 88 Sr 50 , 87 Rb 50 , 86 Kr 50 ) to strong prolate deformation (b 2 ϳ 0.4) at N ϳ 40 and N ϳ 60 [9-13]. For the light isotopes of Sr, Rb, and Kr the deformation develops gradually from N ϳ 46 to N ϳ 40. For several even-even nuclei b 2 can be determined also from lifetime measurements available in the literature [14,15]. In this context the nuclear shapes of 35 Br would be interesting. For Br, however, laser spectroscopy (LS) measurements have not yet been reported in the literature. Thus direct information on the neutron-number dependence of the nuclear deformation in the bromine chain-as normally obtained from LS measurements of mean square radii and nuclear electric quadrupole moments-is not available. Concerning the ground-state properties of neutron-deficient Br isotopes, only the magnetic moments are known experimentally from nuclear orientation (NO) [16] and nuclear magnetic resonance on oriented nuclei (NMR-ON) measurements [17,18]. From these measurements Griffiths et al. drew the conclusion that their results pointed to a gradual increase in nuclear ground-state deformation from b 2 0.20, g 0 in 81 Br to b 2 0.33, g 0 in 75 Br [16]. Such a gradual increase of the deformation with decreasing N was actually in agreement with the change of the deformation of 36 Kr, 37 Rb, and 38 Sr. For bromine, however, the overall deformation may be influenced considerably by the single-particle properties of the valence proton.

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Nuclear magnetic resonance on oriented76,77,82Br in Fe

1993

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Study of short-lived bromine isotopes

Cited by 7 publications

References 18 publications

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Evidence for Octupole Correlations in Multiple Chiral Doublet Bands

Drastic Increase of the Nuclear Deformation in Bromine betweenA=79and 77

Nuclear magnetic resonance on oriented76,77,82Br in Fe

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