Experimental study of the lifetime and phase transition in neutron-rich 
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Ansari, S. M. Razaullah; Régis, J.-M.; Jolie, J.; Saed-Samii, N.; Warr, N.; Körten, W.; Zielińska, M.; Salsac, M. D.; Blanc, A.; Jentschel, M.; Köster, U.; Mutti, P.; Söldner, T.; Simpson, G. S.; Drouet, F.; Vancraeyenest, A.; France, G. de; Clément, E.; Stézowski, O.; Ur, C. A.; Urban, W.; Regan, P.H.; Podolyák, Zs.; Larijani, C.; Townsley, C.; Carroll, R.; Wilson, E.; Mach, H.; Fraile, L. M.; Paziy, V.; Olaizola, B.; Vedia, V.; Bruce, A. M.; Roberts, O. J.; Smith, J. F.; Scheck, M.; Kroll, Thilo; Hartig, A.-L.; Ignatov, A.; Ilieva, S.; Lalkovski, S.; Mărginean, N.; Otsuka, Takaharu; Shimizu, Noritaka; Togashi, Tomoaki; Tsunoda, Y.

doi:10.1103/physrevc.96.054323

Cited by 48 publications

(64 citation statements)

References 52 publications

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“…The 40 Zr isotopes have been recently the subject of several experimental investigations [9][10][11][12][13][14][15] and theoretical studies, including mean-field based methods [16][17][18], the Monte-Carlo shell-model (MCSM) [19] and algebraic methods [8,20]. We adapt here the algebraic approach of the Interacting Boson Model (IBM) [21], with bosons representing valence nucleon pairs counted from the nearest closed shells.…”

Section: The Ibm With Configuration Mixing In the Zr Chainmentioning

confidence: 99%

Intertwined quantum phase transitions in the Zr isotopes

2019

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We present a detailed analysis of spectra and other observables for the entire chain of Zr isotopes, from neutron number 52 to 70, in the framework of the interacting boson model with configuration mixing. The results suggest a remarkable interplay of multiple quantum phase transitions (QPTs).One type of QPT involves an abrupt crossing of normal and intruder configurations, superimposed on a second type of QPT involving gradual shape-changes within each configuration.

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Section: The Ibm With Configuration Mixing In the Zr Chainmentioning

confidence: 99%

Intertwined quantum phase transitions in the Zr isotopes

2019

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“…The Zr isotopes have been recently the subject of several experimental investigations [12][13][14][15][16][17][18], opening the door for understanding the properties of both yrast and non-yrast states.…”

Section: Introductionmentioning

confidence: 99%

Interplay between shape-phase transitions and shape coexistence in the Zr isotopes

Gavrielov¹,

Leviatan²,

Iachello³

2019

Phys. Scr.

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We investigate the evolution of structure in the zirconium isotopes where one of the most complex situations encountered in nuclear physics occurs. We demonstrate the role of two concurrent types of quantum phase transitions, sharing a common critical point. The first type, involves an abrupt crossing of coexisting normal and intruder configurations. The second type, involves a gradual shapephase transition within the intruder configuration, changing from weakly-deformed to prolate-deformed and finally to gamma-unstable. Evidence for this scenario is provided by a detailed comparison with experimental data, using a definite algebraic framework.

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“…In previous work by Bettermann et al [28], using the βγγ fast-timing method, a lifetime of τ (4 + ) = 29 ±9 ps was obtained for the 4 + state in 98 Zr, while only upper limits could be obtained for the 2 + state (τ (2 + 1 )≤ 15 ps) and the 6 + state (τ (6 + 1 ) ≤ 14 ps). More recently, in the work by Ansari et al [29], the so far most precise upper limit for the lifetime of 2 + 1 state in 98 Zr was obtained as τ (2 + 1 ) ≤ 6 ps, and an upper limit of 15 ps was reported for the 4 + 1 state. These limits for the 2 + state did not allow to prove whether the onset of collectivity at N = 60, i.e.…”

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confidence: 98%

Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Singh¹,

Körten²,

Hagen³

et al. 2018

Phys. Rev. Lett.

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The lifetimes of first excited 2 + , 4 + and 6 + states in 98 Zr were measured with the Recoil-Distance Doppler-Shift method in an experiment performed at GANIL. Excited states in 98 Zr were populated using the fission reaction between a 6.2 MeV/u 238 U beam and a 9 Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified in mass and atomic number in the VAMOS++ spectrometer. Our result shows very small B(E2; 2 + 1 → 0 + 1 ) value in 98 Zr thereby confirming the very sudden onset of collectivity at N = 60. The experimental results are compared to large-scale Monte Carlo Shell model and beyond mean field calculations. The present results indicate coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.The study of various modes of excitations and the associated evolution of nuclear shapes along spin and isospin axes in atomic nuclei is one of the fundamental quests in nuclear physics. While nuclei with "magic numbers" of protons and/or neutrons have spherical ground states, as one moves away, the polarizing effect of added nucleons leads to deformation. Throughout the nuclear landscape, this onset of deformation is usually a gradual process, however in neutron rich nuclei around mass A ∼ 100 the shape change is rather drastic and abrupt. The ground states of Sr and Zr isotopes with N ranging from the magic number N = 50 up to N < 60 are weakly deformed, however, they undergo a rapid shape transition from nearly spherical to well deformed prolate deformations as N = 60 is approached. The sudden nature of shape transition in Sr and Zr isotopes is evident from the abrupt changes in the two neutron separation energies [1] and mean-square charge radii [2, 3], but also from the excitation energies of 2 + 1 states and B(E2) values [4]. On the other hand, in isotopes with Z ≥ 42 the shape change is rather gradual [1,5] showing also characteristic signatures of triaxiality. This strong dependence of the observed spectroscopic properties, both on the number of protons and neutrons, makes the neutron-rich A ∼ 100 nuclei an excellent mass region for testing various theoretical models.Many experimental and theoretical studies have already been reported on the structure of these nuclei. More specifically for the Zr isotopes, the onset of deformation at N = 60 has been described by a number of theoretical models [6][7][8][9][10][11][12][13][14][15][16][17][18][19], however, none of the models have been able to successfully reproduce the aforementioned rapid change. Very recently, the abrupt shape changes were correctly described by large-scale Monte-Carlo Shell Model (MCSM) calculations [20,21]. In the so-called type-II shell evolution scenario, the (prolate) deformed states in the isotopes with N ≥ 60 are associated with proton excitations to the 0g 9/2 orbital. Driven by the central and tensor components of the effective (proton-neutron) interactions, these excitations result in a lowering and subsequent filling of the neutron 0g ...

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Experimental study of the lifetime and phase transition in neutron-rich Zr98,100,102

Cited by 48 publications

References 52 publications

Intertwined quantum phase transitions in the Zr isotopes

Intertwined quantum phase transitions in the Zr isotopes

Interplay between shape-phase transitions and shape coexistence in the Zr isotopes

Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

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