Evidence for collective behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ce</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>128</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>from lifetime measurements

Wells, J.C.; Johnson, Noah R.; Hattula, J.; Fewell, M.P.; Haenni, D.R.; Lee, I. Y.; McGowan, F.K.; Johnson, James W.; Riedinger, L. L.

doi:10.1103/physrevc.30.1532

Cited by 27 publications

(14 citation statements)

References 11 publications

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“…The experimental data [1][2][3][4][5] shows that this collective pattern evolves rapidly in moving from 132 Ce to 130 Ce to 128 Ce. Sometime ago, Zhang et al [11] pointed out that E + 4 /E + 2 ratio is an important parameter for determining the shape of a nucleus.…”

Section: Introductionmentioning

confidence: 89%

“…The experimental data [1][2][3][4][5] ) as an effect of h 11/2 neutron alignment process. It has been found that theoretical attempts have been made by many authors to study specific nuclei and there is a lack of microscopic calculation to study the low-lying systematics of the entire neutron-deficient part of Ce isotopic mass chain in a single framework.…”

Section: Introductionmentioning

confidence: 99%

“…An inspection of the recent experimental data [1][2][3][4][5][6][7][8][9][10], for example the energy level spacings and the lifetimes of excited states in the light neutron-deficient Cerium (Ce) nuclei reveals a region of pronounced collective behavior. The experimental data [1][2][3][4][5] shows that this collective pattern evolves rapidly in moving from 132 Ce to 130 Ce to 128 Ce.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic study of deformed neutron-deficient 124-132Ce isotopes

Bhat¹,

Devi²,

Khosa³

2003

Braz. J. Phys.

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Variation after Projection (VAP) calculations in conjunction with Hartree Bogoliubov (HB) ansatz have been carried out for 124−132 Ce mass chain. In this framework, the yrast spectra, B(E2) transition probabilities and occupation numbers for various shell model orbits have been obtained. The observed decrease in deformation in going from 124 Ce to 132 Ce is seen to arise due to a slow decrease in the occupation of 1g 7/2 proton orbit and a systematic increase in the occupations of 2d 5/2 , 1g 7/2 and 1h 11/2 neutron orbits. Besides this, the experimental low-lying yrast spectra and B(E2) transition probabilities are reproduced with reasonable accuracy by using PQOH interaction. I IntroductionAn inspection of the recent experimental data [1-10], for example the energy level spacings and the lifetimes of excited states in the light neutron-deficient Cerium (Ce) nuclei reveals a region of pronounced collective behavior. The experimental data [1][2][3][4][5] ) as an effect of h 11/2 neutron alignment process. It has been found that theoretical attempts have been made by many authors to study specific nuclei and there is a lack of microscopic calculation to study the low-lying systematics of the entire neutron-deficient part of Ce isotopic mass chain in a single framework. It is with this motivation to study the low-lying systematics of the neutron-deficient isotopes that we plan to study these nuclei in a suitable calculational framework.In the present paper an attempt has been made to carry out a microscopic study of the yrast states and B(E2) transition probabilities in the neutron-deficient 124−132 Ce, by employing the VAP [13] formalism in conjunction with the HB [14] ansatz for the axially symmetric wave functions. For the calculation of yrast levels, the pairing plus-quadrupolequadrupole-plus-octupole-octupole plus-hexadecapolehexadecapole (PQOH) model of effective interaction in a valence space spanned by 3s 1/2 , 2d 3/2 , 2d 5/2 , 2f 7/2 , 1g 7/2 , 1h 9/2 , 1h 11/2 and 1i 13/2 orbits for protons as well as neutrons is employed. The 100 Sn is considered as an inert core. II Calculational details II.1 The one and two body parts of the HamiltonianThe spherical single-particle energies (S.P.E.'s) that we have employed are (in MeV): (2d 5/2 ) = 0.0, (3s 1/2 ) = 1.4, (2d 3/2 ) = 2.0, (1g 7/2 ) = 4.0, (1h 11/2 ) = 6.5, (2f 7/2 ) = 13.0, (1h 9/2 ) = 14.0 and (1i 13/2 ) = 15.5. The S.P.E.'s of 2d 5/2 , 3s 1/2 , 2d 3/2 , 1g 7/2 and 1h 11/2 are nearly the same as that employed by Vergados and Kuo [15] as well as

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microscopic study of deformed neutron-deficient 124-132Ce isotopes

Bhat¹,

Devi²,

Khosa³

2003

Braz. J. Phys.

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“…• 12~pr deduced from the present studies is shown in figure 2. The most strongly populated transitions I =(&5) 6 and 550.6 keV correspond to the AI = 2 ground-band in Z2SCe, excited up to the 6 + level [3]. Three more y-rays at 592,799 and 873 keV have been placed in the decay scheme.…”

Section: ~96mentioning

confidence: 99%

Beta-decay of even-A neutron-deficient Pr isotopes

Barnéoud¹,

Blachot²,

Genevey³

et al. 1988

Z. Physik A - Atomic Nuclei

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and 132,134pm nuclei it appears, as expected, that b-decay processes feed quite well several low-energy excited states in Ce or Nd nuclei. The various levels deduced in even-A Ce from the present work have also been populated by ~+ + EC decay of light praseodymium isotopes. Activities were produced at the SARA facility by4using the He-jet method in reactions of 250 MeV ~ projectiles on 2-3 mg/cm 2 isotopi-

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“…In earlier studies on 130,132,134 Ce, Husar et al [1] and Nolan et al [2] obtained both energy level spacing and life-time results which indicated increased collective behavior with decreasing neutron number. Wells et al [3] obtained evidence for collective behavior in 128 Ce from lifetime measurements, Saladin et al [4] studied evidence for continuum E0 transitions following the decay of high-spin states in 130 Ce. No detailed work has been done on the structure of cerium nuclei and it is necessary to carry out calculations that are comparable to experimental results.…”

Section: Introductionmentioning

confidence: 98%

Microscopic interacting boson model calculations for even-even 128–138Ce nuclei

Türkan

Maraş

2007

Pramana - J Phys

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In this study, we determined the most appropriate Hamiltonian that is needed for the present calculations of energy levels and B(E2) values of 128−138 Ce nuclei which have a mass around A ∼ = 130 using the interacting boson model (IBM). Using the bestfitted values of parameters in the Hamiltonian of the IBM-2, we have calculated energy levels and B(E2) values for a number of transitions in 128,130,132,134,136,138 Ce. The results were compared with the previous experimental and theoretical (PTSM model) data and it was observed that they are in good agreement. Also some predictions of this model have better accuracy than those of PTSM model. It has turned out that the interacting boson approximation (IBA) is fairly reliable for calculating spectra in the entire set of 128,130,132,134,136,138 Ce isotopes and the quality of the fits presented in this paper is acceptable.

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Evidence for collective behavior inCe128from lifetime measurements

Cited by 27 publications

References 11 publications

Microscopic study of deformed neutron-deficient 124-132Ce isotopes

Microscopic study of deformed neutron-deficient 124-132Ce isotopes

Beta-decay of even-A neutron-deficient Pr isotopes

Microscopic interacting boson model calculations for even-even 128–138Ce nuclei

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