[en] Recent investigations of h_11/2 proton intruder bands in odd ₅₁Sb nuclei are reported. In addition to experiments performed at SUNY Stony Brook and Chalk River, data from Early Implementation of GAMMASPHERE (analysis in progress) are presented. In particular, the nuclei ¹⁰⁹Sb and ¹¹¹Sb are discussed. Rotational bands based on the πh_11/2 orbital coupled to a 2p2h deformed state of the ₅₀Sn core have been observed. These bands have been observed to high spin, and in the case of ¹⁰⁹Sb to a rotational frequency of 1.4 MeV, the highest frequency observed in a heavy nucleus. The dynamic moments of inertia in these bands decrease slowly with frequency, suggesting a gradual band termination. The systematics of such bands in ^109-119Sb will be discussed

[en] Short communication. 1 tab

[en] We have performed experiments on the β-decay of several Sn nuclides near /sup 132/Sn. The multiplet structure of /sup 132,130/Sb was studied and an extensive level scheme was constructed for the decay of the 7-isomer in /sup 130/Sn. These investigations were extended to /sup 131,129,127/Sb where the properties of the more complex multiplets were determined. Extensive high-spin level schemes were constructed for the decay of /sup 131,129/Sn and a 19/2-, β-decaying isomer was placed in the /sup 129/Sb level scheme. A partial level is presented for the decay of the 19/2- isomer into levels of /sup 129/Te

[en] Excited states have been identified for the first time in ¹¹⁰Sb in a comprehensive series of γ-spectroscopy experiments, including recoil-mass and neutron-field measurements. Three high-spin decoupled bands with configurations based on 2p-2h excitations across the Z = 50 shell gap, are observed to show the features of smooth band termination, the first such observation in an odd-odd nucleus. The yrast intruder band has been connected to the low spin levels and is tentatively identified up to its predicred termination at I^π = (45⁺). Detailed configuration assignments are made through comparison with configuration-dependent cranked Nilsson-Strutinsky calculations; excellent agreement with experiment is obtained. The systematic occurrence of smoothly terminating bands in the neighboring isotopes is discussed

[en] Targetry of ^natSn-target on Cu substrate was investigated for the production of ^{117,118m,119,120m,122}Sb. The electrodeposition experiments were carried out using potassium stannate trihydrate and potassium hydroxide. The optimum conditions of the electrodeposition of tin were as follows: 40 g/L ^natSn, temperature 75 ^oC and current density (dc) used throughout of 50 mA/cm². The deposited target was irradiated at 160 μA current and 16 MeV proton beam (10 min). Separation of no-carrier-added (nca) ^{117,118m,119,120m,122}Sb from the irradiated ^natSn target hydrochloric solution was investigated using silica-gel column chromatography. (authors)

No abstract available

[en] Sub-10 nm semiconducting nanostructures are crucial for the realization of nanoscale devices. Fabrication of nanostructures at this scale with homogeneous properties is challenging. Using ab initio calculations, we show that self-standing ribbons of antimony selenide and antimony sulfide of width 1.1 nm exhibit well-defined bandgaps of 1.66 and 2.16 eV, respectively. Molecular dynamics studies show that these ribbons are stable at 500 K. The one-dimensional (1D) heterostructure of these nanoribbons (Sb₂Se₃/Sb₂S₃) along the [001] direction shows a straddling type behavior.

[en] The properties of the excited states of the Sb isotopes were studied. The excited states were produced mainly with the (p,xn) reaction. A detailed description of the experimental techniques used and of the analysis of the experimental data is given. The use of Hauser-Feshbach analysis for spin assignments is discussed. Singles γ-ray spectra, n-γ and γ-γ coincidence measurements are reported in a study of the level properties of the lighter odd-odd Sb nuclei, ¹¹²Sb, ¹¹⁴Sb and ¹¹⁶Sb. The light odd-A Sb isotopes ¹¹¹Sb, ¹¹³Sb, and ¹¹⁵Sb were studied with in-beam γ-techniques using the (p,2n) reaction on enriched foils of ¹¹²Sn, ¹¹⁴Sn and ¹¹⁶Sn for the production of the excited states. (Auth.)

[en] In recent years, environmental concerns regarding antimony have grown considerably due to anthropogenic processes that have resulted in increasing concentration of Sb in the environment, and also because of its impacts and possible adverse effects to living organisms. Several techniques have been used, to obtain reliable results for Sb, since Sb is present at low level concentration, requiring analytical instrumentation with low detection limits. The neutron activation analysis (NAA) technique has a high metrological level for the determination of several elements in different matrices. However, Sb determination in environmental and biological samples presents some analytical difficulties due to its low concentrations and gamma ray spectrum interferences. The objective of this research was to study on Sb determination in environmental reference materials by NAA. Ten environmental reference materials were selected and analyzed using long period irradiation at IEA-R1 research nuclear reactor. The induced gamma activities of ¹²²Sb and ¹²⁴Sb were measured. Relative errors of the results demonstrated that the accuracy depends mainly on Sb radioisotope measured, the decay time for counting and the sample composition. (author)

[en] The existence of rotational structures in nuclei bordering on the spherical Z= 50 closed shell has been known for some time. Nevertheless, our understanding of collective effects in this region is remarkably incomplete; for example, before this work little high-spin data existed and there were no lifetime measurements to confirm the collectivity associated with the rotational bands observed in Sb (Z = 51) and Sn (Z = 50) nuclei. Furthermore, the role of the h_11/2 orbital was virtually unknown, although it has the highest angular momentum of the orbitals in this mass region and therefore is expected to have the most influence on the properties of high-spin states. In the A ∼ 130 and A ∼ 180 mass regions, where highly deformed intruder bands have been observed, it is the neutron i_13/2 orbitals, respectively, which are preferentially lowered in energy by a combination of large deformation and fast rotation In lighter nuclei the h_11/2 orbital is expected to appear as an intruder configuration. (author). 11 refs., 1 tab., 4 figs