Lifetime measurements and nuclear deformation in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>A</mml:mi><mml:mo>≈</mml:mo><mml:mn>100</mml:mn></mml:mrow></mml:math>region

Smith, A. G.; Durell, J. L.; Phillips, W. R.; Urban, W.; Sarriguren, P.; Ahmad, I.

doi:10.1103/physrevc.86.014321

Cited by 84 publications

(42 citation statements)

References 69 publications

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“…An extremely strong electric monopole transition of ρ 2 (E0) = 0.185 (50) was observed between these two states [12,13], indicating the presence of a sizable deformation and strong mixing between the configurations. In 98 Sr, the ground-state band has a rotational character, and the large B(E2) values between its members, deduced from lifetime measurements [10,[14][15][16][17][18][19], are consistent with a deformed character of the ground state. A low-lying 0 + 2 state at 215.3 keV was established by Schussler et al [20] and interpreted as the band head of a presumably spherical structure.…”

Section: Introductionmentioning

confidence: 62%

Low-energy Coulomb excitation of Sr96,98 beams

Clément¹,

Zielińska²,

Péru³

et al. 2016

Phys. Rev. C

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The structure of neutron-rich 96,98 Sr nuclei was investigated by low-energy safe Coulomb excitation of radioactive beams at the REX-ISOLDE facility, CERN, with the MINIBALL spectrometer. A rich set of transitional and diagonal E2 matrix elements, including those for non-yrast structures, has been extracted from the differential Coulomb-excitation cross sections. The results support the scenario of a shape transition at N = 60, giving rise to the coexistence of a highly deformed prolate and a spherical configuration in 98 Sr, and are compared to predictions from several theoretical calculations. The experimental data suggest a significant contribution of the triaxal degree of freedom in the ground state of both isotopes. In addition, experimental information on low-lying states in 98 Rb has been obtained.

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Section: Introductionmentioning

confidence: 62%

Low-energy Coulomb excitation of Sr96,98 beams

Clément¹,

Zielińska²,

Péru³

et al. 2016

Phys. Rev. C

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“…Because of the refractory character of molybdenum, radioactive beams of this element cannot be delivered from ISOL facilities, which makes direct measurements of B(E2) transition strengths via low-energy Coulomb excitation impossible. The alternative is to measure lifetimes of excited states, which, for example, was achieved with a plunger technique following the spontaneous fission of 248 Cm [5]. The present paper presents a variant of the relativistic Doppler-shift-attenuation method and its application to the picosecond lifetimes in neutron-rich Mo isotopes.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental evidence for triaxiality in neutron-rich molybdenum isotopes was reported in Refs. [4][5][6] for even-even nuclei and in Ref. [7] for the odd-even ones.…”

Section: Introductionmentioning

confidence: 99%

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Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

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Background: In the neutron-rich A ≈ 100 mass region, rapid shape changes as a function of nucleon number as well as coexistence of prolate, oblate, and triaxial shapes are predicted by various theoretical models. Lifetime measurements of excited levels in the molybdenum isotopes allow the determination of transitional quadrupole moments, which in turn provides structural information regarding the predicted shape change. Purpose: The present paper reports on the experimental setup, the method that allowed one to measure the lifetimes of excited states in even-even molybdenum isotopes from mass A = 100 up to mass A = 108, and the results that were obtained. Method:The isotopes of interest were populated by secondary knock-out reaction of neutron-rich nuclei separated and identified by the GSI fragment separator at relativistic beam energies and detected by the sensitive PreSPEC-AGATA experimental setup. The latter included the Lund-York-Cologne calorimeter for identification, tracking, and velocity measurement of ejectiles, and AGATA, an array of position sensitive segmented HPGe detectors, used to determine the interaction positions of the γ ray enabling a precise Doppler correction. The lifetimes were determined with a relativistic version of the Doppler-shift-attenuation method using the systematic shift of the energy after Doppler correction of a γ -ray transition with a known energy. This relativistic Doppler-shiftattenuation method allowed the determination of mean lifetimes from 2 to 250 ps. Results: Even-even molybdenum isotopes from mass A = 100 to A = 108 were studied. The decays of the low-lying states in the ground-state band were observed. In particular, two mean lifetimes were measured for the first time: τ = 29.7 Conclusions:The reduced transition strengths B(E2), calculated from lifetimes measured in this experiment, compared to beyond-mean-field calculations, indicate a gradual shape transition in the chain of molybdenum isotopes when going from A = 100 to A = 108 with a maximum reached at N = 64. The transition probabilities decrease for 108 Mo which may be related to its well-pronounced triaxial shape indicated by the calculations.

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“…Nuclei with Z∼40 exhibit a sudden onset of deformation resulting in a dramatic shape change from spherical to prolate shapes near N = 60. The first indication of this transition came from early studies of γ emission from spontaneous fission fragments [17], measurements that have since been refined significantly with the improvements in detection technology (see for example [18]). For molybdenum and ruthenium isotopes, the evolution in shape persists, but is more gradual in nature.…”

Section: Introductionmentioning

confidence: 99%