[en] The ⁴⁰Ca(⁷Li,2n)⁴⁵V reaction was studied by means of prompt and delayed n-γ and γ-γ coincidences. On the basis of the observed gamma cascades, the comparison with those known in the mirror nucleus ⁴⁵Ti, and lifetime measurements for gamma transitions populating the ⁴⁵V ground state, preliminary assignments were made for states in ⁴⁵V. 1 figure

[en] The astrophysical reaction rate of the ⁴⁵V(p,γ)⁴⁶Cr reaction, which is relevant to ⁴⁴Ti production in core-collapse supernovae, has been revised through a consistent application of the Thomas-Ehrman level displacement formalism. The new rate agrees well with that predicted by the NON-SMOKER statistical calculation with an ETFSI mass model

[en] Objective: To investigate histopathological and immuno phenotypic differences between breast carcinomas sporadic (CM E) and developed in the context of breast cancer (B C) Family (CM F). Methodology: The study included in the CME group (n = 34) patients (pts) with unilateral CM diagnosed after age 30 without family history of CM. In CM F group (n = 26) family members were included pts with 3 or more cases of CM (at least one diagnosed before age 50) or two cases with any of the following sub-criteria: at least one case diagnosed before age 35, paternal transmission, bilateral breast cancer, cancer ovary. Each group was subdivided into 2 subgroups according to age at diagnosis of CM: age equal to or greater than 40 years (subgroup 1) and age under 40 years (subgroup 2). It recorded the clinical characteristics and conventional anatomical and pathological parameters. By immunohistochemistry (IHC) expression of estrogen receptors was studied and progesterone (E R, P R), HER2, p3, bcl-2 and Ki67. Appropriate statistical tests were applied to Univariate and multivariate analyzes. Results: Mean age at diagnosis (45 vs 58, p <0.001) and tumor size (p <0.05) were lower in the CMF group than in the group with CME. In both groups predominant histological type was infiltrating ductal carcinoma NOS. He documented a tendency to higher histological grade and lower E R expression in CMF regarding CME. There were no differences in the expression of Pr, HER2, Ki67, bcl2 and p53. while in the CMF group no differences in tumor characteristics were observed by age diagnosis, in the CME, subgroup 2 showed a predominance of edges expansive growth, lower tubular differentiation, histological grade end stores III, minor component in situ, and low expression of RE. Discussion: Morphologic and immune phenotypic features are similar to the CMF studies documented in the United States and Europe, which agrees with the ancestral origin predominant in our population. Overall, the group presented a phenotype CMF tumor similar to that observed in tumors associated with BRCA2 mutations, or more ratio BRCA2 mutations and / or genes of unknown susceptibility. these results are in agreement with the prevalence of BRCA2 mutations in Uruguayan families recently reported by our group. Within the group with the CME under 40 pts years of diagnosis had a tumor phenotype similar to the tumor-associated BRCA1, so even in the absence of family history of CM, the investigation would be justified Germ line mutations in this gene. Conclusions: phenotypic characterization of breast carcinomas can contribute to selection of pts for conducting genetic tests in our population

[en] Experiments at U. of Rochester (NSRL) and at Argonne National Lab, designed to measure the ground state nuclear magnetic moments of short-lived mirror isotopes in the sd-shell (²³Mg, T_1/2 = 11.3 s) and the f_7/2-shell (⁴³Ti, T_1/2 = 0.49 s, and ⁴⁵V, T_1/2 = 0.54 s) are presented. Reaction products are mass separated using the Rochester RMS (²³Mg) or the Argonne FMA (⁴³Ti, ⁴⁵V), polarized by passage through tilted carbon foils and implanted in a crystal host which is surrounded by an rf coil and immersed in an external magnetic holding field. Anisotropic Β-emission serves as signature of ensemble polarization, and a frequency scan of the applied rf locates the nuclear magnetic resonance when decay asymmetry vanishes. Adequate decay asymmetry has been observed for ²³Mg in cooled MgO and Pt host crystals, resulting in a few rf scans and a preliminary magnetic moment value. Sufficient production yield and separation of ⁴³Ti and ⁴⁵V have been observed, and polarization tests are currently underway. Progress for these systems as well as improvement on the ²³Mg moment will be presented

[en] The β⁺ decay of ⁴⁵V (Jsup(π), T = 7/2^-, 1/2) has been observed. The half-life was found to be 539 +- 18 ms; in addition to the superallowed transition to the mirror state (⁴⁵Ti ground state), it exhibits a (4.3 +- 1.5)% allowed branch to the 5/2^- state at 40.1 keV in ⁴⁵Ti. Decay data for the complete fsub(7/2) shell series of mirror nuclei are presented. (orig.)

[en] Direct mass measurements of ⁷⁸Kr projectile fragments have been performed in the recently commissioned storage ring CSRe employing the isochronous mass spectrometry method. A new data-analysis technique has been developed to correct the drifts in the revolution frequencies caused by instabilities of the magnetic fields in the CSRe, thus yielding a mass resolving power of R=m/Δm∼1.7x10⁵ (sigma). Masses for ⁴⁵V, ⁴⁷Cr, ⁴⁹Mn and ⁵¹Fe nuclei are determined with a relative mass precision of δm/m∼2x10^-7 (sigma) which is an improvement by a factor of ∼2 compared to the literature values.

[en] A complete survey is presented of all half-life and branching-ratio measurements related to the isospin T=1/2 mirror β transitions ranging from ³He to ⁸³Mo. No measurements are ignored, although some are rejected for cause. Using the decay energies obtained in the 2003 Mass Evaluation experimental ft values are then determined for the transitions up to ⁴⁵V. For the first time also all associated theoretical corrections needed to convert these results into ''corrected''Ft values, similar to the superallowed 0⁺→0⁺ pure Fermi β transitions, were calculated. Precisions of the resulting values are in most cases between 0.1 and 0.4%. These Ft^mirror values can now be used to extract precise weak interaction information from past and ongoing correlation measurements in the beta decay of the T=1/2 mirror β transitions

[en] The aim of this work is to evaluate the performance of a strip sensor with a single photon counting data acquisition system based on VA1 readout chips to study the feasibility of a silicon microstrip detector for medical application. The sensor is an AC-coupled single-sided microstrip sensor and the active area of the sensor is 32.0 mmx32.0 mm with a thickness of 380 μm. The sensor has 64 readout strips with a pitch of 500 μm. The sensor was biased at 45 V and the experiment was performed at room temperature. Two silicon strip sensors were mounted perpendicularly one another to get two-dimensional position information with a 5 mm space gap. Two low noise analog ASICs, VA1 chips, were used for signal readout of the strip sensor. The assembly of sensors and readout electronics was housed in an Al light-tight box. A CsI(Tl) scintillation crystal and a 2-in. photomultiplier tube were used to trigger signal events. The data acquisition system was based on a 64 MHz FADC and control softwares for the PC-Linux platform. Imaging tests were performed by using a lead phantom with a ⁹⁰Sr radioactive source and a 45 MeV proton beam at Korea Institute of Radiological and Medical Science in Seoul, respectively. Results of the S/N ratio measurement and phantom images are presented

[en] The status of the ion-guide isotope separator on line at the Tohoku University Cyclotron is reported. Using the present ion-guide system together with a ΔE-E plastic counter telescope and germanium detector we identified 16 short-lived nuclei including firstly mass separated nuclei; ⁵⁷Cu, ⁴⁵V and so on. The efficiency of mass separation was ε ∼1 %, where ε is defined as the number of atoms collected at the end of the separator divided by that recoiling from the target. Application of IGISOL to nuclear physics is being performed for nuclei in the f_7/2-p3/2 shell regions and medium mass neutron-rich nuclei produced by proton-induced fission reaction with a uranium target. (author)

[en] The study of mirror symmetry has been extended to the Tz=±1/2 nuclei 45V and 45Ti using a 24Mg + 24Mg fusion-evaporation reaction at the Vivitron accelerator at IReS Strasbourg. In order to extend the study to more-exotic nuclei, a new experimental technique using fragmentation of a secondary beam has been tried at GSI. The aim was to study excited states in 53Ni using fragmentation of a 55Ni beam produced in the initial fragmentation of 600 MeV/A 58Ni by a 9Be target. Details and results of both experiments will be presented