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Ion-beam-induced atomic transport and phase formation in the system nickel/antimony (1993)

Uhrmacher, M. ; Wodniecki, P. ; Shi, F. ; [et al.]

Springer

Applied physics 57 (1993), S. 353-361

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ISSN: 1432-0630

Keywords: 61.80 ; 68.35 ; 68.55

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract Sb/Ni multilayers of 200 nm total thickness were ion-beam mixed with 900 keV Xe++ or 600 keV Ar++ ions using fluences up to 1016 ions/cm2. The formation of crystalline intermetallic phases was observed by X-ray diffraction (XRD). To investigate, on a microscopic scale, the mixing-effects the perturbed angular correlation (PAC) technique was applied using some 1012 implanted radioactive 111In ions. The different phases were identified in the PAC spectra by comparison with those taken for single-phase material of intermetallic Ni/Sb compounds and pure Ni and Sb. After the 111In implantation usually up to 50% of the probes are found with PAC-parameters typical for the single metallic layers. The rest of the probes showed a complex mixture of electric field gradients (EFG). During ion-beam mixing this fraction increased to 100%. In some experiments individual EFGs were resolved indicating the formation of crystalline NiSb and Ni5Sb2 intermetallic phases.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00332289

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Ion-beam-induced atomic transport and phase formation in the system nickel/antimony (1993)

Shi, F. ; Weber, T. ; Bolse, W. ; [et al.]

Springer

Applied physics 57 (1993), S. 343-351

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ISSN: 1432-0630

Keywords: 61.80 ; 68.35 ; 68.55

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics

Notes: Abstract We report on the ion-beam mixing processes of Sb/Ni marker layers and bilayers under the irradiation of ions ranging from He to Pb, at 80 K and at room temperature. The concentration profiles are obtained by Rutherford backscattering spectroscopy with 900 keV α-particles. At 80 K, the bilayer mixing rates cannot be reproduced by purely ballistic mixing; the essentially linear scaling of the bilayer mixing rate with the energy F D deposited at the interface points to local spike formation. A transition to global spike formation seems to be visible for the Pb-irradiations. Additional mixing effects at 300 K are due to radiation enhanced diffusion and scale with √F D. The marker mixing rates at 80 K are reproduced by the ballistic mixing approach, but are equally well described by local spike models. High fluence Xe-irradiations of Sb/Ni bilayers lead to intermetallic phases in the interface region as verified by transmission electron microscopy.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00332288

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Rotational and single-particle structures in83Zr (1991)

Rudolph, D. ; Gross, C. J. ; Lieb, K. P. ; [et al.]

Springer

The European physical journal 338 (1991), S. 139-148

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ISSN: 1434-601X

Keywords: 21.10 R ; 23.20.Ck ; 23.20.−g ; 27.50.+e

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract The band structure of83Zr has been investigated using the Daresbury recoil separator and TESSA array with 20 Compton suppressed Ge detectors and the reaction28Si (58Ni, 2pn) at 195 MeV. DCO ratios have been used to make many new spin assignments. The three known rotational bands have been extended up to the onset of the five quasiparticle bands. On the basis of the 21/2+, 23/2+ and 25/2+ yrast and yrare states, a (3qp) structure similar to those found in the isotones79Kr and81Sr has been identified. Additional bands have been observed for the first time, one of which appears to be non-collective. Strong mixing between the various negative parity bands is evident. A multiplet of states feeding the three quasiparticle region of the negative parity yrast band has been found. The data is interpreted in the framework of the cranked shell model.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01284787

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Decay of three-particle high spin states in85Y (1985)

Diller, R. ; Lieb, K. P. ; Lühmann, L. ; [et al.]

Springer

The European physical journal 321 (1985), S. 659-669

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ISSN: 1434-601X

Keywords: 27.50.+e ; 23.20.−g ; 21.60.−n

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract High spin states in85Y have been excited in the reaction72Ge(16O,p2n) at 48–60 MeV beam energy. From measurements ofnγ andγγ coincidences, excitation functions and angular distributions, the high spin spectrum of85Y has been established up to 5.4 MeV excitation energy and spinI≦29/2. Lifetimes or limits of lifetimes have been determined for 14 levels via the recoil distance and Doppler shift attenuation method. Theg 9/2 decoupled proton band is found to backbend atI π=17/2+ as also seen in the reduction of the 17/2+→13/2+ and 21/2+→17/2+ E2 transition strengths. The lowest (3qp) positive parity band has predominantly aν 2 g 9/2×πg 9/2 structure. The observed negative parity yrast states in the spin range 15/2−≦I≦29/2− are most probably of (g 9/2)2 ×(f 5/2,p 1/2) (3qp) nature as suggested by a comparison of the84Sr and85Y level structures and electromagnetic transition strengths.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01432443

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Structure of high spin states in83Y (1988)

Lister, C. J. ; Varley, B. J. ; Fieber, W. ; [et al.]

Springer

The European physical journal 329 (1988), S. 413-427

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ISSN: 1434-601X

Keywords: 21.10.HW ; 23.20.−g ; 27.50.+ e

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract We report on the first in-beam study of high spin levels in83Y which were established up to 9.0 MeV excitation energy and probable spin of 41/2+ resp. 27/2− by means of the reaction58Ni(28Si, 3p). Ten lifetimes and six lifetime limits in the 10−12–10−9 s range were determined in two recoil distance Doppler shift experiments. The positive parity yrast states form ag 9/2 Coriolis decoupled band with partial alignment, near-rigid rotor moment of inertia and deformationβ 2=0.29. The negative parity yrast band has very similar collective properties; it shows a pronounced band crossing at rotational frequency ħω≈0.40 MeV which we associate with twoquasiparticleg 9/2 proton alignment. At 2.56 MeV excitation, a second ΔI=1 band starting with 17/2− was found. On the basis of the similarity to85Y and the very weakE2 decay of this state, we suggest that this band has (3qp) configuration with an alignedg 9/2 neutron pair. The lifetimes of the lowest 2+ and 4+ state in84Zr populated in the reaction58Ni (28Si, 2p) were determined to be τ(2)=17.8(11) ps resp. τ(4)=3.5(4) ps.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01294346

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