The deformation of the neutron-rich isotopes102Mo and104Mo

Liang, M.; Ohm, H.; Sutter, Benjamin; Sistemich, K.; Fazekas, B.; Molnár, Gábor

doi:10.1007/bf01303836

Cited by 27 publications

(13 citation statements)

References 10 publications

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“…band are known [1] equally well. The value of/3q = 0.34(1) is larger than that of its neighbour 1~ with/~q=0.28(1) [5]. This indicates an odd-even staggering of the deformation in the Mo isotopes.…”

Section: Discussionmentioning

confidence: 80%

“…There is a Z dependence of the strength of the deformation in the A ~ 100 region: the values of/3q [5] of 1~ and I~ amount to 0.28 (1) and 0.33 (1), respectively, whereas the corresponding isotones 98Sr, l~176 [6] and l~176 [7], ~~ [8] have larger values, namely /3q=0.37 (1), 0.34 (1) and 0.38(1), 0.38 (2). This Z dependence may be caused by the pattern of the shell model orbitals around the doubly submagic 96Zr and differences in the deformation-driving proton-neutron interactions.…”

Section: Introductionmentioning

confidence: 98%

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The structure of the deformed nucleus 42 103 Mo61

Liang

Ohm

Ragnarsson³

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Abstract. The lifetimes of the three lowest excited members of the rotational ground-state band of 1~ at 102.6, 241.1 and 433.2 keV as well as of the levels at 353.8 and 456.1 keV have been determined through a measurement of the delayed coincidences between/~ particles from the decay of the parent l~ and the 7 rays which depopulate the levels. A plastic and a BaF 2 detector have been used for the /~ and 7 rays, respectively, in these experiments at the fission product separator JOSEF. The results for all three band members evince that this nucleus has a sizeable deformation, with a value of/3q=0.34(1). This value is larger than that of the neighbouring eveneven Mo isotopes which indicates an odd-even effect. On the other hand it confirms the observation that the Mo nuclei are in general less strongly deformed than their Sr and Zr isotones. Particle-rotor model calculations with the Nilsson parameters ~c = 0.084, j~ = 0.28 provide a good description of the ground-state band and of a side band based on the 346.5 keV level, including the new lifetimes. This substantiates the Nilsson orbital assignments of [41113/2 + and [532]5/2-for these two bands, respectively, where the sideband is strongly affected by a [54113/2-admixture. There is evidence for an additional band based on the 641.1 keV level for which the assignment [42213/2 + is proposed.

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Section: Discussionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 98%

The structure of the deformed nucleus 42 103 Mo61

Liang

Ohm

Ragnarsson³

et al. 1993

Z. Physik A - Hadrons and Nuclei

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“…The band crossing phenomenon in the Mo isotopes was studied within the framework of the cranked shell model [19], an example is shown in Fig. 20, where the calculation for 104 Mo was made using the quadrupole deformation parameter, ␤ Ϸ 0.33 [42], and a triaxial shape with ␥ = −19° [ 15]. The predicted crossing frequency for the h 11/2 neutron alignment is significantly lower than that for the g 9/2 proton alignment and is in reasonable agreement with the observed crossing frequency.…”

Section: B Mo Isotopesmentioning

confidence: 99%

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

et al. 2004

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Neutron-rich Zr and Mo isotopes were populated as fission fragments produced by the 238 U͑␣, f͒ fusionfission reaction. The level schemes of these nuclei have been extended beyond the first band crossing region, which can be ascribed to the h 11/2 neutron pair alignment. The spin alignment and signature splitting for the h 11/2 orbitals in term of triaxiality is addressed. The crossing frequency of the aligned bands in even Zr and Mo isotopes can be reproduced well by calculations using the cranked shell model. Compared to the Zr isotopes, band crossings in Mo isotopes shift to a lower rotational frequency due to the emerging importance of the ␥ degree of freedom. Within the framework of particle-rotor model, the difference in the signature splitting observed for the h 11/2 bands between the odd Zr and Mo isotopes can be attributed to the triaxial degree of freedom in the Mo isotopes. The surprising shift of the band crossing to a higher rotational frequency in 106 Mo is interpreted as a manifestation of the deformed subshell closure at N = 64.

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“…with/?q---0.31(1) and 0.32(1) [6,7] respectively, in line with the assumption of saturation of the deformation at A ~ 100.…”

Section: Introductionmentioning

confidence: 68%