Octupole deformation in neutron-rich barium isotopes

Phillips, W. R.; Ahmad, I.; Emling, H.; Holzmann, R.; Janssens, R. V. F.; Khoo, T. L.; Drigert, M. W.

doi:10.1103/physrevlett.57.3257

Cited by 239 publications

(131 citation statements)

References 8 publications

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“…The evolution of quadrupole deformation and the presence of the octupole collectivity in the barium isotopes have attracted much attention both experimentally and theoretically [1][2][3][4][5][6]. As expected, quadrupole deformation was found to increase gradually with decreasing neutron number from the spherical N = 82 semi-magic nucleus 138 Ba to the N = 66 midshell isotope 122 Ba.…”

Section: Introductionmentioning

confidence: 96%

First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

et al. 2017

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Excited states have been observed for the first time in the neutron-deficient nucleus 117 Ba using the Recoil-Decay Tagging technique following the heavy-ion fusion-evaporation reaction 64 Zn( 58 Ni, 2p3n)117 Ba. Prompt γ rays have been assigned to 117 Ba through correlations with β-delayed protons following the decay of A = 117 recoils. Through the analysis of the γ-γ coincidence relationships, a high-spin level scheme consisting of two bands has been established in 117 Ba. Based on the systematics of the level spacings in the neighboring barium isotopes, the two bands are proposed to have νh 11/2 [532]5/2 − and νd 5/2 [413]5/2 + configurations, respectively. The observed band-crossing properties are interpreted in the framework of cranked shell model.

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Section: Introductionmentioning

confidence: 96%

First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

et al. 2017

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“…Following the development of large detector arrays, much progress has been made in investigating the high spin states in these neutronrich nuclei. In previous experimental studies, octupoledeformed bands and strong octupole correlations have been observed in many nuclei in this region, especially in Z = 56 Ba and Z = 58 Ce neutron-rich isotopes, such as, in 140−146,148 Ba [3][4][5][6][7][8], 144,146,148 Ce [3,5,[9][10][11][12] by measuring the prompt γ-rays from the spontaneous fission of actinide nuclei.…”

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confidence: 77%

Observation of new levels and proposed octupole correlations in neutron-rich150Ce

et al. 2012

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Background : The very neutron-rich 150 Ce is located at the edge of the Z = 56, N=88 octupole deformed island. To study its high spin states and octupole correlations is important for systematically understanding the nuclear structural characteristics in this region. Purpose : To investigate the high spin state levels and to search for octopole correlations in 150 Ce. Methods : The high spin states of 150 Ce are studied by measuring the prompt γ-rays in the spontaneous fission of 252 Cf. The data analysis is by using the γ-γ-γ coincidence methods. The γ → γ(θ) angular correlation measurements are used to determine the spin and indirectly parity of particular levels. Results : A new level scheme of 150 Ce is established. A total of 47 new transitions and 25 new levels are identified comparing with previous results. Six collective bands have been observed and five of them are newly established. An octupole band structure with s = +1 in 150 Ce has been proposed. Systematic analysis for the B(E1)/B(E2) branching ratios, the levels of the octupole bands, the energy differences between negative-and positive-parity bands and the moments of inertia of the bands is carried out in 144,146,148,150 Ce. They give evidences for our assingment of octupole correlations in 150 Ce. The other characteristics of the octupole bands are discussed. Conclusions : An octupole band structure is proposed in 150 Ce. The octupole correlations in 150 Ce are weaker and show more instability than the neighboring lighter Ce isotopes.

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“…The relation between ϑ and gamma energy E is given by [26]: (12) and the relation between E and is given by [27]:…”

Section: Methods and Calculationsmentioning

confidence: 99%

“…The ground-state band GSB with I π =0+, 2+, 4+, ..., and the negative parity band NPB with I π =1 − , 3 − , 5 − .... in even-even nuclei are interwoven, forming a single octupole band with levels characterized by I π =0+, 1−, 2+, 3−, 4+, .... [12][13][14][15][16][17]. This is an example of odd-even staggering or I=1 staggering; the latter term being due to the fact that each energy level with angular momentum I is displaced relatively to its neighbors with angular momenta I= 1 [15].…”

Section: Introductionmentioning

confidence: 99%

Microscopic description of energy-levels for even-even 124-134Xe isotopes

Ahmed

2017

AIP Conference Proceedings

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Abstract.The first measured excited states 1 2 E and the ratio of the second to the first measured excited states, the back-bending, the E-GOS and the ratio among the energies of the (I+2) and (I) states as a function of the spin (I) have been drawn to determine the properties of the ground-states band. The odd-even staggering has been drawn to determine the difference between the energies of ground states band (GSB) and negative parity band (NPB). Bohr-Mottelson Model ( BM ), Interacting Boson Model ( IBM-1 ), Interacting Vector Boson Model ( IVBM ) and Doma-El-Gendy (D-G) relation have been used to calculate the energy levels of (GSB), IBM-1 has been used to calculate the energy of the gamma band (GB), while IVBM and BM have been used to calculate the energy levels of (NPB). The calculated energy levels in comparison with the measured data indicated the quality of the fitness presented in this work.

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Octupole deformation in neutron-rich barium isotopes

Cited by 239 publications

References 8 publications

First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

First identification of excited states in Ba117 using the recoil- β -delayed proton tagging technique

Observation of new levels and proposed octupole correlations in neutron-rich150Ce

Microscopic description of energy-levels for even-even 124-134Xe isotopes

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