Triaxiality and the aligned<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>h</mml:mi><mml:mrow><mml:mn>11</mml:mn><mml:mo>∕</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>neutron orbitals in neutron-rich Zr and Mo isotopes

Hua, H.; Wu, C. Y.; Cline, D.; Hayes, A. B.; Teng, R.; Clark, R. M.; Fallon, P.; Goergen, A.; Macchiavelli, A. O.; Vetter, K.

doi:10.1103/physrevc.69.014317

Cited by 156 publications

(46 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the table, the trigger number refers to the type of coincidence requested in the experiment. T10 corresponds to the number of particles hitting the last FRS plastic scintillator, scaled down by a factor of 2 8 to avoid losses caused by the dead time. T9 represents the trigger requesting a coincidence between a particle detected at the final focal plane of the FRS, a γ ray detected by AGATA, and a particle reaching the last plasticscintillator detector of LYCCA.…”

Section: Experimental Approachmentioning

confidence: 99%

See 1 more Smart Citation

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

View full text Add to dashboard Cite

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.

show abstract

Section: Experimental Approachmentioning

confidence: 99%

“…[7] for the odd-even ones. Hua [8] suggests that a pair alignment in the h 11/2 neutron orbital is responsible for the triaxiality observed in the molybdenum isotopes.…”

Section: Introductionmentioning

confidence: 99%

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Ralet¹,

Piétri²,

Rodríguez³

et al. 2017

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Quadrupole moments were also determined [54] for rotational bands in 98−104 Zr isotopes and deformation parameters were deduced, increasing gradually from β = 0.1 at N = 56 up to β = 0.4 at N = 64. More recently [55], large deformations [β = 0.47 (7) [56] within the particle-rotor model. According to those authors, the difference in signature splitting observed for the 5/2 − [532] band between the odd Zr and the odd Mo isotopes could be attributed to the appearance of triaxiality in Mo isotopes.…”

Section: A Potential Energy Curvesmentioning

confidence: 99%

β-decay properties of neutron-rich Zr and Mo isotopes

Sarriguren

Pereira

2010

Phys. Rev. C

View full text Add to dashboard Cite

Gamow-Teller strength distributions, β-decay half-lives, and β-delayed neutron emission are investigated in neutron-rich Zr and Mo isotopes within a deformed quasiparticle random-phase approximation. The approach is based on a self-consistent Skyrme Hartree-Fock mean field with pairing correlations and residual separable particle-hole and particle-particle forces. Comparison with recent measurements of half-lives stresses the important role that nuclear deformation plays in the description of β-decay properties in this mass region.

show abstract

“…Subsequently, by Durell and Hamilton et al, the ground band [3] was extended up to 12 + and many new twoquasi-particle bands were identified [4] with the pair strength of 102 Zr nucleus calculated, G Q =0.19 MeV. In 2004, more high spin states were observed [5]. For example, the deformed ground band was extended up to 20 + .…”

mentioning

confidence: 98%

The study of energy bands in nucleus 102Zr

Dong

Liu

et al. 2010

Sci. China Phys. Mech. Astron.

View full text Add to dashboard Cite

Theoretical calculations of the energy bands in nucleus 102 Zr are carried out by taking the projected shell model approach, which has reproduced the experimental data. In addition, by analyzing band-head energies, corresponding configurations of yrast band, quasi-particle rotational bands and side bands, we have worked out the microscopic formation mechanism of axially symmetric deformation bands: The low-excitation deformation bands are attributed to the high-j intruder states 1g 7/2 and 1h 11/2 in the N=4, 5 shells; the quasi-particles in the orbit v5/2- [532], v3/2+ [411] and v3/2+ [413] in particular play an important role in the deformation of 102 Zr.projected shell model, yrast band, quasi-particle rotational band, side bandThe nucleus 102 Zr (Z=40, N=62) is located in the A≈100 neutron-rich region, where the nuclei lie far from the β stability and where the valence nucleons begin to fill the g 9/2 proton and h 11/2 neutron orbitals. This region exhibits many important features, such as the shell-closure effects of Z=40, N=56 spherical subshells and a sudden onset of large ground-state deformation for N≥60.By the empirical measurement of prompt γ-rays of spontaneous fission or induced fission of heavy nuclei, much information about energy spectra of this nucleus has been obtained. For 102 Zr, the transition from the 2 + state to the ground state was first identified by Cheifetz et al. [1]. In β-decay work, two 0 2 + and 2 2 + states were also observed [2]. Subsequently, by Durell and Hamilton et al., the ground band [3] was extended up to 12 + and many new twoquasi-particle bands were identified [4] with the pair strength of 102 Zr nucleus calculated, G Q =0.19 MeV. In 2004, more high spin states were observed [5]. For example, the deformed ground band was extended up to 20 + . Led by Hamilton et al., research groups for the first time have identified a two-quasi-particle band with a band head energy of 2926.4 keV through measuring prompt γ-rays in the spontaneous fission of 252 Cf with the Gammasphere array at American Lawrence Berkeley National Laboratory [6] and identified also are two rotational collective bands, with band head energies of 1386.3 and 1652.7 keV.Theoretically, Federman and Pittel et al. made the first calculations that explained onset of large deformation at N=60 in Zr isotope. They also gave evidence that the neutron-proton interaction between the valence particles in the orbits (1g 9/2 ) π and (1g 7/2 ) v might be responsible for the large deformation [7][8][9][10][11], while the neutron-neutron or proton-proton effective interactions were mostly of spherifying nature [12][13][14][15][16][17]. Furthermore, the Zr isotope was calculated based on relativistic mean field theory [18-20] and on the phenomenological quadrupole-quadrupole plus pairing model [21][22][23] of two body interaction respectively. Both the theory and the mode assigned the large deformation in

show abstract

Triaxiality and the alignedh11∕2neutron orbitals in neutron-rich Zr and Mo isotopes

Cited by 156 publications

References 33 publications

Lifetime measurement of neutron-rich even-even molybdenum isotopes

Lifetime measurement of neutron-rich even-even molybdenum isotopes

β-decay properties of neutron-rich Zr and Mo isotopes

The study of energy bands in nucleus 102Zr

Contact Info

Product

Resources

About