Octupole deformation in 142,143Ba and 144Ce: new band structures in neutron-rich Ba-isotopes

Zhu, S.; Lu, Qi; Hamilton, J. H.; Ramayya, A. V.; Peker, L.K.; Wang, M.G.; Ma, W.C.; Babu, B. R. S.; Ginter, T. N.; Kormicki, J.; Shi, D.; Deng, J. K.; Nazarewicz, W.; Rasmussen, J. O.; Stoyer, M. A.; Chu, Steven; Gregorich, Κ. Ε.; Mohar, M. F.; Asztalos, S. J.; Prussin, S.G.; Cole, J. D.; Aryaeinejad, R.; Dardenne, Y. X.; Drigert, M. W.; Moody, K. J.; Loughed, R.W.; Wild, J. F.; Johnson, Noah R.; Lee, I.Y.; McGowan, F.K.; Ter‐Akopian, G. M.; Oganessian, Yu. Ts.

doi:10.1016/0370-2693(95)00900-6

Cited by 92 publications

(28 citation statements)

References 25 publications

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“…The projected shell model is employed to study the band structure of this nucleus. The results show that the calculated levels of the bands are in good agreement with the experimental ones, and the isomeric state and the negative-parity band are based on the proton π5/ The neutron-rich nuclei around the A ∼ 150 region show transitional character from spherical to prolate quadrupole deformation and from octupole vibrational excitations to static octupole deformation [1][2][3][4][5].…”

Section: Abstract High-spin States Of the Neutron-richmentioning

confidence: 64%

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High-spin states and a new band based on the isomeric state in 152Nd

et al. 2010

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Abstract. High-spin states of the neutron-rich152 Nd nucleus have been reinvestigated by measuring the prompt γ-rays in the spontaneous fission of 252 Cf. The ground-state band and a side negative-parity band have been updated. A new band based on the 2243.7 keV isomeric state has been identified. The half-life for the isomeric state has been measured to be 63(7) ns. The projected shell model is employed to study the band structure of this nucleus. The results show that the calculated levels of the bands are in good agreement with the experimental ones, and the isomeric state and the negative-parity band are based on the proton π5/ The neutron-rich nuclei around the A ∼ 150 region show transitional character from spherical to prolate quadrupole deformation and from octupole vibrational excitations to static octupole deformation [1][2][3][4][5].152 Nd is located in the deformed region and has a well-deformed shape. Previously, the level structure of 152 Nd has been studied by using various experimental methods [6][7][8][9][10][11][12]. The ground-state band and a negative-parity band based on a 2 − state have been identified. In addition, the identification of the K isomeric states and the bands built on the isomers is a very important topic in this region. In a recent publication, two-quasiparticle (2-qp) isomeric states and bands based on the isomers have been reported in 154,156 Nd and 156,158,160 Sm [13]. For 152 Nd, an isomeric state was also reported in ref.[11], but no band structure based on that isomer was observed. In order to understand the systematic structural characteristics and to search for the isomeric band, we reinvestigated the high-spin states of 152 Nd. Here we report our new result. To study high-spin states of 152 Nd, the γ-rays in the spontaneous fission of 252 Cf were measured. These γ-rays include prompt γ-rays emitted after their formation in spontaneous fission and delayed γ-rays from β-decay. The a

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Section: Abstract High-spin States Of the Neutron-richmentioning

confidence: 64%

“…The neutron-rich nuclei around the A ∼ 150 region show transitional character from spherical to prolate quadrupole deformation and from octupole vibrational excitations to static octupole deformation [1][2][3][4][5].…”

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confidence: 99%

High-spin states and a new band based on the isomeric state in 152Nd

et al. 2010

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“…Spin assignments from Ref. [9] have been adopted in another study of prompt-γ rays from spontaneous fission of 252 Cf [10], replacing their previous assignments [11]. Importantly, in Ref.…”

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confidence: 99%

Reflection symmetry of the near-yrast excitations in145Ba

et al. 2012

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Excited states in145 Ba, populated in spontaneous fission of 248 Cm, have been studied by means of γ spectroscopy, using high-fold γ coincidences measured with the EUROGAM2 array of Ge detectors. The 507.7-keV level, which has been assigned in this work spin and parity 9/2 + , belongs to the i 13/2 intruder band. We have identified in 145 Ba a new 9/2 − 2 level at 346.3 keV and a band on top of it. The negative parity indicates that it is not due to an octupole excitation. The position of the 5/2 − ground state, relative to the positive-parity band, could be reproduced by calculations with a reflection-symmetric potential and we do not observe a parity doublet to the ground state. Therefore we conclude that octupole excitations in 145 Ba are most likely due to octupole vibrations coupled either to the reflection-symmetric ground state or to the i 13/2 , decoupled neutron configuration.

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“…The calculated values for 147 Ce in the present work are given in Table I. The average B(E1)/B(E2) value for s = +i octupole structure in 147 Ce is 0.84×(10 −6 ·f m −2 ), while in the s = +1 octupole structures of the even-even Ce isotopes, the average values are 6 The energy differences δE between the positive-and negative-parity bands in an octupole band structure can be used to discuss the octupole deformation stability with spin variation. Such δE values can be deduced from the experimental level energies by using the relation [12]:…”

Section: High-spin States In Neutron-richmentioning

confidence: 67%

“…Theoretical calculations predicted the existence of octupole deformation around the Z = 56 and N = 88 neutron-rich nuclear region [1][2][3]. By using large detector arrays, octupole-deformed bands and octupole correlations have been identified in many nuclei in this region, especially in even-even Ba (Z = 56) and Ce (Z = 58) nuclei, such as, in 140,142,144,146,148 Ba [3][4][5][6][7][8], 144,146,148,150,152 Ce [4,[9][10][11][12][13][14]. For the odd-A nuclei in this region, octupole deformation and octupole correlations have also been identified in several nuclei, e.g.…”

Section: High-spin States In Neutron-richmentioning

confidence: 99%