Abrupt shape transition at neutron number 
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: 
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 values in 
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Régis, J.-M.; Jolie, J.; Saed-Samii, N.; Warr, N.; Pfeiffer, Markus; 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.; Fraile, L. M.; Mach, H.; 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.; Körten, W.; Mărginean, N.; Otsuka, Takaharu; Shimizu, Noritaka; Togashi, Tomoaki; Tsunoda, Y.

doi:10.1103/physrevc.95.054319

Cited by 34 publications

(29 citation statements)

References 23 publications

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“…The lifetime of the 121.7-keV level has been reported to be measured several times [31] and, therefore, constitutes a good test case. Furthermore several lifetimes measured from this data set have been reported previously [32][33][34]. The 192.6-536.0-121.7-keV cascade was used for this.…”

Section: Resultsmentioning

confidence: 99%

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Lifetimes and shape-coexisting states of Zr99

Spagnoletti¹,

Simpson²,

Kisyov³

et al. 2019

Phys. Rev. C

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Lifetimes of intermediate-spin states in two rotational bands of 99 Zr have been measured. These states were populated following the neutron-induced fission of 235 U at the PF1B beamline of the Institut Laue-Langevin, Grenoble, during the EXILL-FATIMA campaign. The nucleus 99 Zr 59 exhibits shape coexistence and lies precisely on the border of an abrupt change in ground-state deformation when going from N = 58 to N = 60, making its study interesting for understanding the mechanisms involved in the rapid onset of deformation here. The B(E 2) values extracted for decays in the ν3/2[541] band allow quadrupole deformations of β 2 = 0.34(1) and 0.26(3) to be determined for the 821.6-and 1236.6-keV members, whereas β 2 = 0.32(3) was found for the 850.5-keV member of the ν3/2 [411] band. Some of the excited states known in 99 Zr have been reasonably described with interacting boson-fermion model (IBFM) calculations. Type-II shell evolution is proposed to play a major role in modifying single-particle energies in 99 Zr.

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Section: Resultsmentioning

confidence: 99%

“…A thorough description of this method is presented in Refs. [33,34] Transition branching ratios from [31] and corrections for internal conversion [37] were used to convert the measured level lifetimes into partial stretched E 2 lifetimes (τ E 2 ). Reduced transition rates were then calculated using the formula…”

Section: -mentioning

confidence: 99%

Lifetimes and shape-coexisting states of Zr99

Spagnoletti¹,

Simpson²,

Kisyov³

et al. 2019

Phys. Rev. C

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“…As the subscript "FEP" indicates, this only holds for events where no time-correlated background is present. An analytical background time correction is used to interpolate the time-correlated background at the energy of interest, which has been shown to be most reliable [2,[28][29][30]:…”

Section: Fast-timing Methodsmentioning

confidence: 99%

“…The product of the strength constant ν times the boson quadrupole operator for proton bosonsQ (2) π times the quadrupole operator for the odd neutronq (2) ν represents the quadrupole dynamical term [41]. The second term describes the exchange interaction introduced to consider that the bosons are in fact nucleon pairs.…”

Section: -5mentioning

confidence: 99%

“…Shape transitions in the A ≈ 100 region have been the subject of intense studies lately. The rapid change from the near spherical 96 Sr to the strongly deformed 98 Sr is well known [1,2]. Due to the proton subshell closures at Z = 38 (π p 3/2 ) and at Z = 40 (π p 1/2 ) and the neutron subshell closures at N = 50 (νg 9/2 ), N = 56 (νd 5/2 ), and N = 58 (νs 1/2 ), the N = 50-58 ( 88−96 Sr) strontium and ( 90−98 Zr) zirconium isotopes have the low-energy structure of a semimagic nucleus.…”

Section: Introductionmentioning

confidence: 99%

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Lifetime measurements and shape coexistence in Sr97

et al. 2019

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Delayed γ rays from neutron-rich A = 97 fission fragments were measured using the Lohengrin spectrometer at the high-flux reactor of the Institut Laue-Langevin in Grenoble. Several lifetimes of excited states in 97 Sr were measured using the fast-timing technique. The nucleus 97 Sr exhibits shape coexistence and is located exactly at the border of the spherical (N 58) and deformed (N 60) ground-state deformation. It is of particular interest to study the shape-coexisting structures at the spherical-deformed border (N = 59). The determined lifetimes within this work are compared to an interacting boson-fermion model calculation that is based on the microscopic energy density functional to provide a better understanding of the spherical-deformed border in strontium isotopes.

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Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

2022

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The paper reviews recent developments in $$\gamma $$ γ -ray spectroscopy of the neutron-rich fragments produced in nuclear fission. This subject has been an intensive area of study spanning more than five decades. Here we highlight key results and describe the evolution of the associated experimental techniques since the last review papers in 1995 (I. Ahmad and W.R. Phillips, Rep. Prog. Phys. 58(11), 1415 (1995); J. H. Hamilton et al., Prog. Part. Nucl. Phys. 35, 635(1995)). Research themes in nuclear structure will be explored along with the fission reaction mechanism and the links to nuclear astrophysics and applications.

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Abrupt shape transition at neutron number N=60 : B(E2) values in Sr

Cited by 34 publications

References 23 publications

Lifetimes and shape-coexisting states of Zr99

Lifetimes and shape-coexisting states of Zr99

Lifetime measurements and shape coexistence in Sr97

Gamma-ray spectroscopy of fission fragments with state-of-the-art techniques

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