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95 results on '"C., Rossi Alvarez"'

1. THE 19/2- g-FACTOR IN 39K USING A TRANSIENT FIELD-FUSION REACTION TECHNIQUE

Author: R. Ribas, D. Bazzacco, A. A. Pakou, F. Brandolini, E. Maglione, P. Pavan, C. Rossi-Alvarez, and M. DePoli
Subjects: Physics, g factor, Nuclear fusion, Thermodynamics, Transient field
Abstract: The magnetic moment of the 19/2- state in 39K has been measured by the transient field technique. The state was excited by the inverse reaction 12C(32S,pa)39K and the recoil nucleus traversed a thin Gd foil. Its absolute g-factor, g= 0.35(3), was obtained by an internal calibration, which makes use of the magnetic moment of the 15/2+ state in 41Ca also excited in the same reaction. The experimental result agrees well within shell model predictions.
Published: 2020
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2. S-factor of 14N(p,γ)15O at astrophysical energies⋆

Author: M. Junker, C. Rolfs, Mario R. Romano, A. Lemut, E. Somorjai, Carlo Broggini, A. Formicola, Gianluca Imbriani, J. N. Klug, Gy. Gyürky, Alberto Vomiero, A. Guglielmetti, C. Gustavino, R. Bonetti, Daniel Bemmerer, R. Menegazzo, C. Rossi Alvarez, D. Schürmann, Zs. Fülöp, Frank Strieder, A. P. Jesus, F. Confortola, P. Corvisiero, Vincenzo Roca, G. Gervino, Oscar Straniero, Filippo Terrasi, Carmen Angulo, H. Costantini, F. Schümann, Paolo Prati, Jenniffer Cruz, H. P. Trautvetter, Pierre Descouvemont, Imbriani, Gianluca, H., Costantini, A., Formicola, A., Vomiero, C., Angulo, D., Bemmerer, R., Bonetti, C., Broggini, F., Confortola, P., Corvisiero, J., Cruz, P., Descouvemont, Z., Fülöp, G., Gervino, A., Guglielmetti, C., Gustavino, Gyürky, G. y., A. P., Jesu, M., Junker, J. N., Klug, A., Lemut, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, Romano, Mario, C., Rossi Alvarez, F., Schümann, D., Schürmann, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, H. P., Trautvetter, Z., Fulop, Gyurky, G. Y., C., ROSSI ALVAREZ, F., Schumann, and D., Schurmann
Subjects: Experimental Nuclear Physic, Physics, Nuclear and High Energy Physics, Work (thermodynamics), 010308 nuclear & particles physics, S-factor, FOS: Physical sciences, chemistry.chemical_element, underground laboratory, 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Level structure, Nuclear Experiment (nucl-ex), Nuclear Astrophysic, Tin, Nuclear Experiment, 010303 astronomy & astrophysics, Value (mathematics)
Abstract: The astrophysical S-factor of 14N(p,gamma)15O has been measured for effective center-of-mass energies between E_eff = 119 and 367 keV at the LUNA facility using TiN solid targets and Ge detectors. The data are in good agreement with previous and recent work at overlapping energies. R-matrix analysis reveals that due to the complex level structure of 15O the extrapolated S(0) value is model dependent and calls for additional experimental efforts to reduce the present uncertainty in S(0) to a level of a few percent as required by astrophysical calculations., Comment: Eur. Phys. J. A, accepted. 17 pages, 15 figures
Published: 2005
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3. Uranium distribution in the Variscan Basement of Northeastern Sardinia

Author: Stefano Cuccuru, Giacomo Oggiano, Giovanni Fiorentini, Liliana Mou, Xhixha M. Kaçeli, Antonio Puccini, A. Zanon, G. P. Buso, Enrico Guastaldi, Matteo Albéri, Gerti Xhixha, C. Rossi Alvarez, Ivan Callegari, Fabio Mantovani, Leonardo Casini, G. P. Bezzon, Marica Baldoncini, and Virginia Strati
Subjects: 010504 meteorology & atmospheric sciences, Metamorphic rock, Pluton, Geography, Planning and Development, Geochemistry, FOS: Physical sciences, chemistry.chemical_element, 010502 geochemistry & geophysics, 01 natural sciences, Variscan granitoids, Physics - Geophysics, Earth and Planetary Sciences (miscellaneous), 0105 earth and related environmental sciences, geography, Arzachena pluton, Variscan-Sardinian batholith, geography.geographical_feature_category, Radiogenic nuclide, Bedrock, in situ and laboratory gamma-ray spectroscopy, Kriging with Variance of Measurements Errors, radiogenic heat-producing elements, Ambientale, Massif, Uranium, Geophysics (physics.geo-ph), Basement (geology), chemistry, Spatial variability, Geology
Abstract: We present a detailed map of the uranium distribution and its uncertainties in the Variscan Basement of Northeastern Sardinia (VBNS) at a scale 1:100,000. An area of 2100 km2 was investigated by means of 535 data points obtained from laboratory and in situ gamma-ray spectrometry measurements. These data volume corresponds to the highest sampling density of the European Variscides, aimed at studying the genetic processes of the upper crust potentially triggered by an enrichment of radiogenic heat-producing elements. For the first time the Kriging with Variance of Measurement Error method was used to assign weights to the input data which are based on the degree of confidence associated to the measurements obtained with different gamma-ray spectrometry techniques. A detailed tuning of the model parameters for the adopted Experimental Semi-Variogram led to identify a maximum distance of spatial variability coherent to the observed tendency of the experimental data. We demonstrate that the obtained uranium distribution in the VBNS, characterized by several calc-alkaline plutons emplaced within migmatitic massifs and amphibolite-facies metamorphic rocks, is an excellent benchmark for the study of 'hot' collisional chains. The uranium map of VBNS, and in particular the Arzachena minor pluton, confirms the emplacement model based on the recognition of the different petrological associations characterizing the Variscan magmatic processes in the Late Paleozoic. Furthermore, the presented model of the uranium content of the geological bedrock is a potential baseline for future mapping of radon-prone areas., 16 pages, 6 Figures, 1 Map
Published: 2015
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4. Big Bang6Li nucleosynthesis studied deep underground (LUNA collaboration)

Author: C. G. Bruno, H. Costantini, Tamás Szücs, V. Mossa, A. Bellini, M. Erhard, G. Gervino, A. Boeltzig, C. Gustavino, Oscar Straniero, Daniel Bemmerer, M. P. Takács, Carlo Broggini, David Scott, Marialuisa Aliotta, A. Guglielmetti, Z. Elekes, A. Formicola, Gy. Gyürky, E. Somorjai, Antonio Caciolli, P. Corvisiero, Zs. Fülöp, Davide Trezzi, Rosanna Depalo, C. Mazzocchi, Michele Marta, M. Junker, A. Lemut, Thomas Davinson, Paolo Prati, F. Ferraro, R. Menegazzo, F. R. Pantaleo, F. Cavanna, M. Anders, and C. Rossi Alvarez
Subjects: Big Bang, Nuclear reaction, Physics, e Underground, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics, Big Bang Nucleosynthesis, 01 natural sciences, Cosmology, Nuclear physics, Stars, Big Bang nucleosynthesis, Nuclear Astrophysics, Big Bang Nucleosynthesis, 6Li abundanc,e Underground, Nucleosynthesis, 6Li abundanc, 0103 physical sciences, Nuclear Astrophysics, Nuclear astrophysics, Nuclide, 6Li abundance, Underground, 010306 general physics
Abstract: The correct prediction of the abundances of the light nuclides produced during the epoch of Big Bang Nucleosynthesis (BBN) is one of the main topics of modern cosmology. For many of the nuclear reactions that are relevant for this epoch, direct experimental cross section data are available, ushering the so-called “age of precision”. The present work addresses an exception to this current status: the 2H(α,γ)6Li reaction that controls 6Li production in the Big Bang. Recent controversial observations of 6Li in metal-poor stars have heightened the interest in understanding primordial 6Li production. If confirmed, these observations would lead to a second cosmological lithium problem, in addition to the well-known 7Li problem. In the present work, the direct experimental cross section data on 2H(α,γ)6Li in the BBN energy range are reported. The measurement has been performed deep underground at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator in the Laboratori Nazionali del Gran Sasso, Italy. The cross section has been directly measured at the energies of interest for Big Bang Nucleosynthesis for the first time, at E c m = 80, 93, 120, and 133 keV. Based on the new data, the 2H(α,γ)6Li thermonuclear reaction rate has been derived. Our rate is even lower than previously reported, thus increasing the discrepancy between predicted Big Bang 6Li abundance and the amount of primordial 6Li inferred from observations.
Published: 2017

5. Decay properties of high spin states in Mn

Author: D. Bazzacco, J. A. Cameron, C. Rossi Alvarez, J. Sanchez-Solano, H. Grawe, A. Gadea, E. Farnea, S. M. Lenzi, F. Brandolini, D. Cano-Ott, M. De Poli, G. de Angelis, C. A. Ur, D. R. Napoli, J. Döring, M. Axiotis, C. A. Kalfas, E. Nâcher Gonzalez, Gabriel Martínez-Pinedo, Berta Rubio, S. Lunardi, R. Borcea, N. Marginean, J. L. Tain, T. Martinez, E. Roeckl, and C. Mazzocchi
Subjects: Physics, Recoil, Spin states, Spins, Attenuation, Detector, Shell (structure), Atomic physics, Coincidence
Abstract: The electromagnetic decay properties of high spin states in 52Mn have been studied through various experiments with the GASP and EUROBALL arrays plus the ISIS charged-particle detector, the Neutron-Wall and the Recoil Filter Detector. From 7-7-particles coincidence measurements, spins and parities of these states have been determined and using the Doppler-shift attenuation method the mean life of some of these states have been determined. These results are compared with large scale shell-model calculations in the full fp shell.
Published: 2019
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6. The bottleneck of CNO burning and the age of Globular Clusters

Author: H. P. Trautvetter, R. Bonetti, H. Costantini, R. Menegazzo, Oscar Straniero, Gianluca Imbriani, P. Corvisiero, Filippo Terrasi, A. Formicola, Frank Strieder, Zsolt Fülöp, C. Gustavino, C. Rossi Alvarez, A. Guglielmetti, Gyuri Gyürky, Jenniffer Cruz, Alberto Vomiero, Sandra Zavatarelli, E. Somorjai, G. Gervino, M. Junker, Mario R. Romano, A. Lemut, Vincenzo Roca, Paolo Prati, Carlo Broggini, A. P. Jesus, F. Schümann, C. Rolfs, Daniel Bemmerer, G., Imbriani, H., Costantini, A., Formicola, D., Bemmerer, R., Bonetti, C., Broggini, P., Corvisiero, J., Cruz, Z., Fulop, G., Gervino, A., Guglielmetti, C., Gustavino, G., Gyurky, A. P., Jesu, M., Junker, A., Lemut, R., Menegazzo, P., Prati, V., Roca, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schumann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, A., Vomiero, S., Zavatarelli, Imbriani, Gianluca, Costantini, H., Formicola, A., Bemmerer, D., Bonetti, R., Broggini, C., Corvisiero, P., Cruz, J., Fülöp, Z., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, G., Jesus, A. P., Junker, M., Lemut, A., Menegazzo, R., Prati, P., Roca, Vincenzo, Rolfs, C., Romano, Mario, Rossi Alvarez, C., Schümann, F., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., Vomiero, A., and Zavatarelli, S.
Subjects: Physics, 010308 nuclear & particles physics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Bottleneck, Luminosity, stars: evolution - stars: population II - nuclear reaction, Red-giant branch, Reaction rate, Stars, Low energy, nucleosynthesi, Space and Planetary Science, Globular cluster, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, abundances - Galaxy: globular clusters, Low Mass, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics
Abstract: The transition between the Main Sequence and the Red Giant Branch in low mass stars is powered by the onset of the CNO burning, whose bottleneck is the $^{14}$N(p,$\gamma)^{15}$O. The LUNA collaboration has recently improved the low energy measurements of the cross section of this key reaction. We analyse the impact of the revised reaction rate on the estimate of the Globular Clusters ages, as derived from the turnoff luminosity. We found that the age of the oldest Globulars should be increased by about 0.7-1 Gyr with respect to the current estimates.
Published: 2004
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7. A new study of 10B(p, Î±)7Be reaction at low energies

Author: C. Spitaleri, M. La Cognata, S. Romano, Antonio Caciolli, S. M. R. Puglia, Rosanna Depalo, C. Rossi Alvarez, M. L. Sergi, V. Rigato, Liliana Mou, Carlo Broggini, R. Menegazzo, A. Tumino, and L. Lamia
Subjects: Physics, Range (particle radiation), Nuclear and High Energy Physics, 010308 nuclear & particles physics, chemistry.chemical_element, Germanium, 01 natural sciences, Nuclear physics, Cross section (physics), chemistry, Clean energy, 0103 physical sciences, Nuclear astrophysics, Activation method, Nuclear Experiment, 010303 astronomy & astrophysics, Energy (signal processing)
Abstract: The $^{10}$B(p,$\alpha$)$^{7}$Be reaction is of great interest since it has many applications in different fields of research such as nuclear astrophysics, nuclear physics, and models of new reactors for clean energy generation. This reaction has been studied at the AN2000 accelerator of the INFN National Laboratories of Legnaro (LNL). The total cross section has been measured in a wide energy range (250 $-$ 1182 keV) by using the activation method. The decays of the $^7$Be nuclei produced by the reaction were measured at the low counting facility of LNL by using two fully shielded high-purity germanium detectors. The present dataset shows a large discrepancy with respect to one of the previous data at the same energies and reduces the total uncertainty to the level of 6\%. An R-matrix calculation has been performed on the present data using the parameters from previous Trojan Horse measurements for the 10 and 500 keV resonances. The present data do not lay on the R-matrix fit in one point suggesting the existence of a $^{11}$C level not observed yet. Further nuclear investigations are needed to confirm this hypothesis., Comment: accepted to EPJA (6 pages, 3 figures)
Published: 2016

8. The worldwide NORM production and a fully automated gamma-ray spectrometer for their characterization

Author: Ivan Callegari, Gerti Xhixha, M. Kaçeli Xhixha, G. P. Bezzon, Enrico Guastaldi, A. Pasquini, Carlo Broggini, Antonio Caciolli, Fabio Mantovani, C. Rossi Alvarez, S. De Bianchi, Giovanni Massa, M. Shyti, Giovanni Fiorentini, Roberto Menegazzo, G. P. Buso, and Liliana Mou
Subjects: Health, Toxicology and Mutagenesis, FOS: Physical sciences, Industrial waste/by-product, Raw material, Analytical Chemistry, HPGe, Gamma-ray spectrometry, NORM, Non-nuclear industry, Reference materials, Nuclear Medicine and Imaging, Toxicology and Mutagenesis, Radiology, Nuclear Medicine and imaging, Gamma spectroscopy, Nuclear Experiment (nucl-ex), Process engineering, Nuclear Experiment, Spectroscopy, Physics, Radionuclide, Spectrometer, business.industry, Environmental and Occupational Health, Public Health, Environmental and Occupational Health, Ambientale, Nuclear Energy and Engineering, Radiology, Nuclear Medicine and Imaging, Pollution, Certified reference materials, Fully automated, Health, Norm (mathematics), Electromagnetic shielding, Public Health, Radiology, business
Abstract: Materials containing radionuclides of natural origin, which is modified by human made processes and being subject to regulation because of their radioactivity are known as NORM. We present a brief review of the main categories of non-nuclear industries together with the levels of activity concentration in feed raw materials, products and waste, including mechanisms of radioisotope enrichments. The global management of NORM shows a high level of complexity, mainly due to different degrees of radioactivity enhancement and the huge amount of worldwide waste production. The future tendency of guidelines concerning environmental protection will require both a systematic monitoring based on the ever-increasing sampling and high performance of gamma ray spectroscopy. On the ground of these requirements a new low background fully automated high-resolution gamma-ray spectrometer MCA_Rad has been developed. The design of Pb and Cu shielding allowed to reach a background reduction of two order of magnitude with respect to laboratory radioactivity. A severe lowering of manpower cost is obtained through a fully automation system, which enables up to 24 samples to be measured without any human attendance. Two coupled HPGe detectors increase the detection efficiency, performing accurate measurements on sample volume (180 cc) with a reduction of sample transport cost of material. Details of the instrument calibration method are presented. MCA_Rad system can measure in less than one hour a typical NORM sample enriched in U and Th with some hundreds of Bq/kg, with an overall uncertainty less than 5%. Quality control of this method has been tested. Measurements of certified reference materials RGK-1, RGU-2 and RGTh-1 containing concentrations of K, U and Th comparable to NORM have been performed, resulting an overall relative discrepancy of 5% among central values within the reported uncertainty., 21 pages, 4 figures, 6 tables
Published: 2012
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9. A new FSA approach for in situ γ ray spectroscopy

Author: A. Zanon, Ivan Callegari, C. Rossi Alvarez, G. P. Buso, G. P. Bezzon, Fabio Mantovani, Liliana Mou, Marica Baldoncini, Giovanni Massa, Gerti Xhixha, Tommaso Colonna, Roberto Menegazzo, Antonio Caciolli, Carlo Broggini, M. Shyti, Enrico Guastaldi, and Giovanni Fiorentini
Subjects: Environmental Engineering, Environmental radioactivity, FSA, Soil, Calibration, Sodium, Iodide, Analytical chemistry, Sodium Iodide, Particle detector, Physics - Geophysics, Environmental Chemistry, Least-Squares Analysis, Spectroscopy, Waste Management and Disposal, Radioisotopes, Algorithms, Italy, Scintillation Counting, Spectrum Analysis, Gamma Rays, Pollution, Chemistry, Detector, Gamma ray, Ambientale, Semiconductor detector, Physics - Data Analysis, Statistics and Probability, Scintillation counter, Measuring instrument
Abstract: An increasing demand of environmental radioactivity monitoring comes both from the scientific community and from the society. This requires accurate, reliable and fast response preferably from portable radiation detectors. Thanks to recent improvements in the technology, $\gamma$-spectroscopy with sodium iodide scintillators has been proved to be an excellent tool for in-situ measurements for the identification and quantitative determination of $\gamma$-ray emitting radioisotopes, reducing time and costs. Both for geological and civil purposes not only $^{40}$K, $^{238}$U, and $^{232}$Th have to be measured, but there is also a growing interest to determine the abundances of anthropic elements, like $^{137}$Cs and $^{131}$I, which are used to monitor the effect of nuclear accidents or other human activities. The Full Spectrum Analysis (FSA) approach has been chosen to analyze the $\gamma$-spectra. The Non Negative Least Square (NNLS) and the energy calibration adjustment have been implemented in this method for the first time in order to correct the intrinsic problem related with the $\chi ^2$ minimization which could lead to artifacts and non physical results in the analysis. A new calibration procedure has been developed for the FSA method by using in situ $\gamma$-spectra instead of calibration pad spectra. Finally, the new method has been validated by acquiring $\gamma$-spectra with a 10.16 cm x 10.16 cm sodium iodide detector in 80 different sites in the Ombrone basin, in Tuscany. The results from the FSA method have been compared with the laboratory measurements by using HPGe detectors on soil samples collected in the different sites, showing a satisfactory agreement between them. In particular, the $^{137}$Cs isotopes has been implemented in the analysis since it has been found not negligible during the in-situ measurements., Comment: accepted by Science of Total Environment: 8 pages, 10 figures, 3 tables
Published: 2012
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10. Ground state capture in 14N(p,γ)15O studied above the 259 keV resonance at LUNA

Author: A. Guglielmetti, Zs. Fülöp, Daniel Bemmerer, C. Rossi Alvarez, Carlo Broggini, Antonio Caciolli, E. Somorjai, B. Limata, C. Gustavino, A. Formicola, M. Marta, R. Menegazzo, F. Confortola, G. Gervino, H. Costantini, C. Mazzocchi, Alberto Vomiero, Gianluca Imbriani, R. Bonetti, Oscar Straniero, H. P. Trautvetter, Vincenzo Roca, Paolo Prati, Filippo Terrasi, Z. Elekes, P. Corvisiero, M. Junker, A. Lemut, C. Rolfs, Frank Strieder, Gy. Gyürky, S. Vezzu, H. P., Trautvetter, D., Bemmerer, R., Bonetti, C., Broggini, A., Caciolli, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, A., Formicola, Z., Fulop, G., Gervino, A., Guglielmetti, G., Gyurky, C., Gustavino, G., Imbriani, M., Junker, A., Lemut, B., Limata, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, S., Vezzu, A., Vomiero, Zs, Fäuläop, Gy, Gyäurky, Imbriani, Gianluca, Limata, BENEDICTA NORMANNA, Roca, Vincenzo, C., Rossi Alvarez, F., Terrasi, and S., Vezzù
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Detector, Resonance, CNO cycle, Clover-type gamma detector, Ground state, underground laboratory, Nuclear Experiment, Coincidence
Abstract: We report on a new measurement of $^{14}$N(p,$\gamma$)$^{15}$O for the ground state capture transition at $E_p$ = 360, 380 and 400 keV, using the 400 kV LUNA accelerator. The true coincidence summing effect --the major source of error in the ground state capture determination-- has been significantly reduced by using a Clover--type gamma detector., Comment: 6 pages, 5 figures, Accepted for publication in Journal of Physics G
Published: 2008

11. Comparison of the LUNA 3He(α,γ)7Be activation results with earlier measurements and model calculations

Author: H. Costantini, F. Confortola, Daniel Bemmerer, A. Formicola, R. Bonetti, Z. Elekes, A. Guglielmetti, M. Laubenstein, Carlo Broggini, Oscar Straniero, Gianluca Imbriani, Filippo Terrasi, M. Junker, A. Lemut, V. Lozza, P. Corvisiero, R. Menegazzo, Frank Strieder, C. Rolfs, E. Somorjai, Gy. Gyürky, B. Limata, C. Rossi Alvarez, G. Gervino, Zs. Fülöp, C. Gustavino, M. Marta, H. P. Trautvetter, Vincenzo Roca, Paolo Prati, G., Gyurky, D., Bemmerer, F., Confortola, H., Costantini, A., Formicola, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Z., Fulop, G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, V., Lozza, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, G., Gyürky, Z., Fülöp, Imbriani, Gianluca, Limata, BENEDICTA NORMANNA, Roca, Vincenzo, C., Rossi Alvarez, and F., Terrasi
Subjects: Physics, Nuclear and High Energy Physics, comparison with other data, S-factor, Theoretical models, Zero-point energy, Alpha (ethology), FOS: Physical sciences, activation measurement, nuclear reaction, Nuclear physics, Cross section (physics), Activation method, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Recently, the LUNA collaboration has carried out a high precision measurement on the 3He(alpha,gamma)7Be reaction cross section with both activation and on-line gamma-detection methods at unprecedented low energies. In this paper the results obtained with the activation method are summarized. The results are compared with previous activation experiments and the zero energy extrapolated astrophysical S factor is determined using different theoretical models., Comment: Accepted for publication in Journal of Physics G
Published: 2008

12. Radioisotopic purity and imaging properties of cyclotron-produced 99mTc using direct 100Mo(p,2n) reaction

Author: Flavia Groppi, Adriano Duatti, G. Pupillo, A Selva, Licia Uccelli, L. De Nardo, L. Strada, Antonio Rosato, Micol Pasquali, Alessandra Boschi, C Rossi-Alvarez, Petra Martini, G. Di Domenico, Mario Marengo, A Salvini, Angelo Taibi, L Mou, Federico Zagni, M. Bello, Laura Meléndez-Alafort, M. Loriggiola, Nikolay Uzunov, Simone Manenti, Gianfranco Cicoria, and Juan Esposito
Subjects: Materials science, Proton, Pertechnetate, Cyclotron, 010403 inorganic & nuclear chemistry, 01 natural sciences, NO, 030218 nuclear medicine & medical imaging, Sodium pertechnetate, law.invention, 03 medical and health sciences, chemistry.chemical_compound, 0302 clinical medicine, Image spatial resolution, law, Nuclear Medicine and Imaging, Radiology, Nuclear Medicine and imaging, Nuclide, Image resolution, Range (particle radiation), Radiological and Ultrasound Technology, Radiochemistry, Gamma ray, European pharmacopeia, 0104 chemical sciences, Radioisotopic purity, Compton scattering, Image contrast, Radionuclidic purity, Radiology, Nuclear Medicine and Imaging, chemistry, Radiology
Abstract: Evaluation of the radioisotopic purity of technetium-99m (99mTc) produced in GBq amounts by proton bombardment of enriched molibdenum-100 (100Mo) metallic targets at low proton energies (i.e. within 15-20 MeV) is conducted. This energy range was chosen since it is easily achievable by many conventional medical cyclotrons already available in the nuclear medicine departments of hospitals. The main motivation for such a study is in the framework of the research activities at the international level that have been conducted over the last few years to develop alternative production routes for the most widespread radioisotope used in medical imaging. The analysis of technetium isotopes and isomeric states (9xTc) present in the pertechnetate saline Na99mTcO4 solutions, obtained after the extraction/purification procedure, reveals radionuclidic purity levels basically in compliance with the limits recently issued by European Pharmacopoeia 9.3 (2018 Sodium pertechnetate (99mTc) injection 4801-3). Moreover, the impact of 9xTc contaminant nuclides on the final image quality is thoroughly evaluated, analyzing the emitted high-energy gamma rays and their influence on the image quality. The spatial resolution of images from cyclotron-produced 99mTc acquired with a mini-gamma camera was determined and compared with that obtained using technetium-99m solutions eluted from standard 99Mo/99mTc generators. The effect of the increased image background contribution due to Compton-scattered higher-energy gamma rays (E γ > 200 keV), which could cause image-contrast deterioration, was also studied. It is concluded that, due to the high radionuclidic purity of cyclotron-produced 99mTc using 100Mo(p,2n)99mTc reaction at a proton beam energy in the range 15.7-19.4 MeV, the resulting image properties are well comparable with those from the generator-eluted 99mTc.
Published: 2018
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13. Feasibility of low energy radiative capture experiments at the LUNA underground accelerator facility

Author: Gianluca Imbriani, Mario R. Romano, Daniel Bemmerer, Matthias Junker, Gy. Gyürky, Roberto Menegazzo, F. Confortola, A. P. Jesus, C. Rossi Alvarez, E. Somorjai, Oscar Straniero, C. Gustavino, C. Rolfs, H. P. Trautvetter, Filippo Terrasi, P. Corvisiero, João Cruz, F. Schümann, A. Guglielmetti, Paolo Prati, A. Lemut, G. Gervino, Detlef Rogalla, A. Formicola, B. Limata, Zs. Fülöp, R. Bonetti, Alberto Vomiero, H. Costantini, C. Broggini, Vincenzo Roca, F. Strieder, D., Bemmerer, F., Confortola, A., Lemut, R., Bonetti, C., Broggini, P., Corvisiero, H., Costantini, J., Cruz, A., Formicola, Flp, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, Gyrky, G. Y., G., Imbriani, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, V., Roca, D., Rogalla, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schmann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, A., Vomiero, Fülöp, Z. s., Gyürky, G. y., Imbriani, Gianluca, Roca, Vincenzo, Romano, Mario, C., Rossi Alvarez, F., Schümann, F., Terrasi, Fulop, Z. S., Gyurky, G. Y., F., Schumann, and AND A., Vomiero
Subjects: Nuclear reaction, Physics, Experimental Nuclear Physic, Nuclear and High Energy Physics, Proton, Gamma ray, chemistry.chemical_element, FOS: Physical sciences, Germanium, Bismuth germanate, underground laboratory, Nuclear physics, symbols.namesake, chemistry.chemical_compound, chemistry, symbols, Nuclear astrophysics, Nuclear Experiment (nucl-ex), Nuclear Astrophysic, Doppler effect, Nuclear Experiment, Beam (structure)
Abstract: The LUNA (Laboratory Underground for Nuclear Astrophysics) facility has been designed to study nuclear reactions of astrophysical interest. It is located deep underground in the Gran Sasso National Laboratory, Italy. Two electrostatic accelerators, with 50 and 400 kV maximum voltage, in combination with solid and gas target setups allowed to measure the total cross sections of the radiative capture reactions $^2$H(p,$\gamma$)3He and $^{14}$N(p,$\gamma$)$^{15}$O within their relevant Gamow peaks. We report on the gamma background in the Gran Sasso laboratory measured by germanium and bismuth germanate detectors, with and without an incident proton beam. A method to localize the sources of beam induced background using the Doppler shift of emitted gamma rays is presented. The feasibility of radiative capture studies at energies of astrophysical interest is discussed for several experimental scenarios., Comment: Submitted to Eur. Phys. J. A
Published: 2005

14. The S-factor at solar energies: The prompt γ experiment at LUNA

Author: M. Laubenstein, A. Guglielmetti, Z. Elekes, Vincenzo Roca, R. Menegazzo, G. Gervino, F. Confortola, H. P. Trautvetter, Paolo Prati, Gianluca Imbriani, C. Rolfs, H. Costantini, P. Corvisiero, P. Bezzon, C. Gustavino, Zs. Fülöp, Daniel Bemmerer, Gy. Gyürky, B. Limata, C. Rossi Alvarez, A. Formicola, M. Junker, Oscar Straniero, Filippo Terrasi, F. Strieder, A. Lemut, E. Somorjai, M. Marta, V. Lozza, R. Bonetti, and Carlo Broggini
Subjects: Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Stars, Hydrogen, chemistry, Big Bang nucleosynthesis, Branching fraction, S-factor, Nucleosynthesis, Solar neutrino, chemistry.chemical_element
Abstract: The He 3 ( α , γ ) Be 7 process is a key reaction in both Big-Bang nucleosynthesis and p–p chain of Hydrogen Burning in Stars. A new measurement of the He 3 ( α , γ ) Be 7 cross section has been performed at the INFN Gran Sasso underground laboratory by both the activation and the prompt γ detection methods. The present work reports full details of the prompt γ detection experiment, focusing on the determination of the systematic uncertainty. The final data, including activation measurements at LUNA, are compared with the results of the last generation experiments and two different theoretical models are used to obtain the S-factor at solar energies.
Published: 2008
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15. Impact of a revised $^{25}$Mg(p,$\gamma$)$^{26}$Al reaction rate on the operation of the Mg-Al cycle

Author: Daniel Bemmerer, H. P. Trautvetter, Michele Marta, Gianluca Imbriani, Carlo Broggini, A. Lemut, Luciano Piersanti, H. Costantini, Oscar Straniero, Filippo Terrasi, Vincenzo Roca, Gyuri Gyürky, Frank Strieder, Paolo Prati, C. Mazzocchi, A. Guglielmetti, B. Limata, C. Gustavino, M. Junker, A. Formicola, Roberto Menegazzo, G. Gervino, C. Rolfs, C. Rossi Alvarez, Sergio Cristallo, Antonio Caciolli, E. Somorjai, Z. Elekes, P. Corvisiero, Zsolt Fülöp, A. DiLeva, O., Straniero, Imbriani, Gianluca, F., Strieder, D., Bemmerer, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, S., Cristallo, DI LEVA, Antonino, A., Formicola, Z., Eleke, Fülöp, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyürky, G. y., M., Junker, A., Lemut, B., Limata, M., Marta, C., Mazzocchi, R., Menegazzo, L., Piersanti, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, F., Terrasi, and H. P., Trautvetter
Subjects: Nuclear reaction, Proton, globular clusters: general, nuclear reactions, nucleosynthesis, abundances, stars: AGB and post-AGB, stars: WolfRayet, Astronomy and Astrophysics, Space and Planetary Science, astrofisica nucleare, Astrophysics, Evoluzione stellare, Chemical kinetics, Reaction rate, Nucleosynthesis, Nuclear astrophysics, Asymptotic giant branch, Nuclear Experiment, Physics, abundances, Presolar grains, Nuclear reactions, nucleosynthesis, abundances — Stars: AGB and post-AGB — Stars: Wolf-Rayet — globular clusters: general, Astrophysics - Astrophysics of Galaxies, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract: Proton captures on Mg isotopes play an important role in the Mg-Al cycle active in stellar H-burning regions. In particular, low-energy nuclear resonances in the $^{25}$Mg(p,$\gamma$)$^{26}$Al reaction affect the production of radioactive $^{26}$Al$^{gs}$ as well as the resulting Mg/Al abundance ratio. Reliable estimations of these quantities require precise measurements of the strengths of low-energy resonances. Based on a new experimental study performed at LUNA, we provide revised rates of the $^{25}$Mg(p,$\gamma$)$^{26}$Al$^{gs}$ and the $^{25}$Mg(p,$\gamma$)$^{26}$Al$^{m}$ reactions with corresponding uncertainties. In the temperature range 50 to 150 MK, the new recommended rate of the $^{26}$Al$^{m}$ production is up to 5 times higher than previously assumed. In addition, at T$=100$ MK, the revised total reaction rate is a factor of 2 higher. Note that this is the range of temperature at which the Mg-Al cycle operates in an H-burning zone. The effects of this revision are discussed. Due to the significantly larger $^{25}$Mg(p,$\gamma$)$^{26}$Al$^{m}$ rate, the estimated production of $^{26}$Al$^{gs}$ in H-burning regions is less efficient than previously obtained. As a result, the new rates should imply a smaller contribution from Wolf-Rayet stars to the galactic $^{26}$Al budget. Similarly, we show that the AGB extra-mixing scenario does not appear able to explain the most extreme values of $^{26}$Al/$^{27}$Al, i.e. $>10^{-2}$, found in some O-rich presolar grains. Finally, the substantial increase of the total reaction rate makes the hypothesis of a self-pollution by massive AGBs a more robust explanation for the Mg-Al anticorrelation observed in Globular-Cluster stars.
Published: 2012

16. The25Mg(p, Î³)26Al reaction at low astrophysical energies

Author: A. Best, M. Junker, Antonio Caciolli, E. Somorjai, C. Rolfs, A. Lemut, Z. Elekes, P. Corvisiero, C. Gustavino, Oscar Straniero, Frank Strieder, Gianluca Imbriani, Michele Marta, Filippo Terrasi, A. Formicola, C. Rossi Alvarez, Daniel Bemmerer, H. P. Trautvetter, Vincenzo Roca, A. DiLeva, Paolo Prati, Zsolt Fülöp, B. Limata, Roberto Menegazzo, Gyuri Gyürky, G. Gervino, A. Guglielmetti, H. Costantini, Carlo Broggini, C. Mazzocchi, F., Strieder, Limata, BENEDICTA NORMANNA, A., Formicola, Imbriani, Gianluca, M., Junker, D., Bemmerer, Best, Andrea, C., Broggini, A., Caciolli, P., Corvisiero, H., Costantini, DI LEVA, Antonino, Z., Eleke, Fülöp, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyürky, G. y., A., Lemut, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Terrasi, and H. P., Trautvetter
Subjects: Physics, Nuclear and High Energy Physics, Nuclear astrophysic, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Resolution (electron density), Resonance, Mg-Al cycle, Nuclear astrophysics, Proton-capture reaction, Reaction rate, Resonance strength, Crystal, Nuclear physics, Underground laboratory, High Energy Physics::Experiment, Atomic physics, Hpge detector, Nuclear Experiment
Abstract: In the present work we report on a new measurement of resonance strengths in the reaction 25Mg(p,gamma)26Al at E_cm= 92 and 189 keV. This study was performed at the LUNA facility in the Gran Sasso underground laboratory using a 4pi BGO summing crystal. For the first time the 92 keV resonance was directly observed and a resonance strength omega-gamma=(2.9+/-0.6)x10E-10 eV was determined. Additionally, the gamma-ray branchings and strength of the 189 keV resonance were studied with a high resolution HPGe detector yielding an omega-gamma value in agreement with the BGO measurement, but 20% larger compared to previous works.
Published: 2012

17. Preparation and characterisation of isotopically enriched Ta2O5 targets for nuclear astrophysics studies

Author: Gianluca Imbriani, Tamás Szücs, H. P. Trautvetter, Oscar Straniero, Marialuisa Aliotta, Filippo Terrasi, M. Marta, G. Gervino, C. Rolfs, A. Formicola, A. Guglielmetti, Zs. Fülöp, Carlo Broggini, M. Campeggio, Gy. Gyürky, Enrico Napolitani, C. Salvo, Frank Strieder, C. Gustavino, R. Menegazzo, V. Rigato, Vincenzo Roca, Paolo Prati, Daniel Bemmerer, M. Anders, C. Rossi Alvarez, Rosanna Depalo, Antonio Caciolli, E. Somorjai, Z. Elekes, P. Corvisiero, Davide Trezzi, Douglas Scott, A. Bellini, A. Di Leva, M. Junker, A., Caciolli, D. A., Scott, A., Di Leva, A., Formicola, M., Aliotta, M., Ander, A., Bellini, D., Bemmerer, C., Broggini, M., Campeggio, P., Corvisiero, R., Depalo, Z., Eleke, Z., Fülöp, G., Gervino, A., Guglielmetti, C., Gustavino, G., Gyürky, G., Imbriani, M., Junker, M., Marta, R., Menegazzo, E., Napolitani, P., Prati, V., Rigato, V., Roca, C., Rolf, C., Rossi Alvarez, E., Somorjai, C., Salvo, O., Straniero, F., Strieder, T., Szüc, Terrasi, Filippo, H. P., Trautvetter, D., Trezzi, DI LEVA, Antonino, Fülöp, Z. s., Gyürky, G. y., Imbriani, Gianluca, Roca, Vincenzo, and F., Terrasi
Subjects: Physics, Nuclear and High Energy Physics, stellar evolution, Proton, nuclear astrophysics, Radiochemistry, Tantalum, FOS: Physical sciences, chemistry.chemical_element, Isotopic composition, chemistry, nuclear physics, Nuclear astrophysics, Special care, Nuclear Experiment (nucl-ex), Nuclear Experiment, Stoichiometry, Beam (structure)
Abstract: The direct measurement of reaction cross sections at astrophysical energies often requires the use of solid targets of known thickness, isotopic composition, and stoichiometry that are able to withstand high beam currents for extended periods of time. Here, we report on the production and characterisation of isotopically enriched Ta$_2$O$_5$ targets for the study of proton-induced reactions at the Laboratory for Underground Nuclear Astrophysics facility of the Laboratori Nazionali del Gran Sasso. The targets were prepared by anodisation of tantalum backings in enriched water (up to 66% in $^{17}$O and up to 96% in $^{18}$O). Special care was devoted to minimising the presence of any contaminants that could induce unwanted background reactions with the beam in the energy region of astrophysical interest. Results from target characterisation measurements are reported, and the conclusions for proton capture measurements with these targets are drawn., accepted to EPJA
Published: 2012
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18. Uranium distribution in the Variscan Basement of Northeastern Sardinia

Author: M. Kaçeli Xhixha, M. Albèri, M. Baldoncini, G.P. Bezzon, G.P. Buso, I. Callegari, L. Casini, S. Cuccuru, G. Fiorentini, E. Guastaldi, F. Mantovani, L. Mou, G. Oggiano, A. Puccini, C. Rossi Alvarez, V. Strati, G. Xhixha, A. Zanon, M. Kaçeli Xhixha, M. Albèri, M. Baldoncini, G.P. Bezzon, G.P. Buso, I. Callegari, L. Casini, S. Cuccuru, G. Fiorentini, E. Guastaldi, F. Mantovani, L. Mou, G. Oggiano, A. Puccini, C. Rossi Alvarez, V. Strati, G. Xhixha, and A. Zanon
Published: 2016
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19. Gamma-decay study of21Na and21Ne, octupole bands in21Ne

Author: C. A. Ur, D. Bazzacco, H. G. Bohlen, S. Lunardi, Tz. Kokalova, W. von Oertzen, S. Thummerer, Aurora Tumino, A. M. Bizzeti-Sona, R. Menegazzo, N. Marginean, S. M. Lenzi, T. N. Massey, B. Gebauer, M. De Poli, G. de Angelis, D. R. Napoli, A. Gadea, P. G. Bizzeti, C. Rossi Alvarez, Th. Kröll, and M. Axiotis
Subjects: Physics, Nuclear and High Energy Physics, Dipole, Spins, Gamma ray, Parity (physics), Atomic physics, Excitation
Abstract: The reactions 16O(7Li, 2n) and 16O(7Li, np) populating 21Na and 21Ne have been studied at EL = 27 MeV using the GASP γ-detector array. The level scheme for 21Na and 21Ne has been extended to higher excitation energy. Spins and parities of the observed levels are assigned tentatively supporting the identification of opposite parity structures connected by strong dipole transitions. The structure of these bands is interpreted as based on a reflection asymmetric cluster structure.
Published: 2003
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20. Direct measurement of the 15N(p,gamma)16O total cross section at novae energies

Author: C. Rossi Alvarez, Z. Elekes, Roberto Menegazzo, Daniel Bemmerer, G. Gervino, Carlo Broggini, Vincenzo Roca, A. Formicola, Paolo Prati, P. Corvisiero, Zs. Fülöp, Antonio Caciolli, C. Gustavino, M. Junker, E. Somorjai, Oscar Straniero, R. Bonetti, H. Costantini, F. Confortola, A. Guglielmetti, C. Rolfs, Gy. Gyürky, M. Marta, B. Limata, D., Bemmerer, A., Caciolli, R., Bonetti, C., Broggini, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, A., Formicola, Zs F¨, Ul¨op, G., Gervino, A., Guglielmetti, C., Gustavino, Gy, Gy¨urky, M., Junker, Limata, BENEDICTA NORMANNA, M., Marta, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, and O., Straniero
Subjects: Nuclear and High Energy Physics, CNO cycle, Hydrogen, chemistry.chemical_element, FOS: Physical sciences, Nova burning, CNO cycle, Bismuth germanate, chemistry.chemical_compound, Cross section (physics), Nuclear Experiment (nucl-ex), Nuclear Experiment, Solar and Stellar Astrophysics (astro-ph.SR), Physics, gas target, novae astrophysics, Nova (laser), Nitrogen, Isotopic composition, LUNA, Astrophysics - Solar and Stellar Astrophysics, chemistry, nuclear astrophisic, Nuclear astrophysics, BGO detector, Center of mass, Atomic physics
Abstract: The 15N(p,gamma)16O reaction controls the passage of nucleosynthetic material from the first to the second carbon-nitrogen-oxygen (CNO) cycle. A direct measurement of the total 15N(p,gamma)16O cross section at energies corresponding to hydrogen burning in novae is presented here. Data have been taken at 90-230 keV center-of-mass energy using a windowless gas target filled with nitrogen of natural isotopic composition and a bismuth germanate summing detector. The cross section is found to be a factor two lower than previously believed., Comment: LUNA collaboration; accepted by J. Phys. G
Published: 2009
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21. Ultra-sensitive in-beam gamma-ray spectroscopy for nuclear astrophysics at LUNA

Author: M. Junker, R. Bonetti, A. Lemut, A. Formicola, Matthias Laubenstein, Z. Elekes, M. Marta, C. Rolfs, C. Gustavino, Gianluca Imbriani, Vincenzo Roca, P. Corvisiero, C. Rossi Alvarez, C. Mazzocchi, Paolo Prati, H. Costantini, B. Limata, Daniel Bemmerer, Carlo Broggini, Zs. Fülöp, Gy. Gyürky, G. Gervino, Antonio Caciolli, E. Somorjai, Oscar Straniero, Frank Strieder, Filippo Terrasi, A. Guglielmetti, R. Menegazzo, L. Agostino, F. Confortola, H. P. Trautvetter, A., Caciolli, L., Agostino, D., Bemmerer, R., Bonetti, C., Broggini, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, A., Formicola, Fulop, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. Y., G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, H. P., Trautvetter, Caciolli, A., Agostino, L., Bemmerer, D., Bonetti, R., Broggini, C., Confortola, F., Corvisiero, P., Costantini, H., Elekes, Z., Formicola, A., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, Gianluca, Junker, M., Laubenstein, M., Lemut, A., Limata, B., Marta, M., Mazzocchi, C., Menegazzo, R., Prati, P., Roca, Vincenzo, Rolfs, C., Rossi Alvarez, C., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., and Trautvetter, H. P.
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, 3H, 3He, complex mixtures, and 4He-induced reactions, Nuclear physics, Nuclear physic, Nuclear astrophysics, γ-ray spectroscopy, Physics::Accelerator Physics, Gamma spectroscopy, Nuclear Experiment (nucl-ex), Spectroscopy, Nuclear Experiment, Beam (structure), Ultra sensitive
Abstract: Ultra-sensitive in-beam gamma-ray spectroscopy studies for nuclear astrophysics are performed at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400 kV accelerator, deep underground in Italy's Gran Sasso laboratory. By virtue of a specially constructed passive shield, the laboratory gamma-ray background for E_\gamma < 3 MeV at LUNA has been reduced to levels comparable to those experienced in dedicated offline underground gamma-counting setups. The gamma-ray background induced by an incident alpha-beam has been studied. The data are used to evaluate the feasibility of sensitive in-beam experiments at LUNA and, by extension, at similar proposed facilities., Comment: accepted, Eur. Phys. J. A
Published: 2009

22. A new study of 25Mg $(\alpha, n)$ 28Si angular distributions at $E_{\alpha} =3-5$ MeV

Author: Rosanna Depalo, M. Cinausero, R. Menegazzo, N. Blasi, C. Rossi Alvarez, Tommaso Marchi, O. Wieland, D. Fabris, S. Appannababu, P. F. Mastinu, Antonio Caciolli, G. Montagnoli, G. Collazuol, M. Degerlier, V. Rigato, F. Gramegna, Carlo Broggini, and Mario Leone
Subjects: Physics, Nuclear and High Energy Physics, Milky Way, Hadron, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy, Neutron spectroscopy, law.invention, Nuclear physics, Astrophysics - Solar and Stellar Astrophysics, law, Nucleosynthesis, Van de Graaff generator, Nuclear fusion, Neutron, Nuclear Experiment
Abstract: The observation of $^{26}$Al gives us the proof of active nucleosynthesis in the Milky Way. However the identification of the main producers of $^{26}$Al is still a matter of debate. Many sites have been proposed, but our poor knowledge of the nuclear processes involved introduces high uncertainties. In particular, the limited accuracy on the $^{25}$Mg($\alpha$,n)$^{28}$Si reaction cross section has been identified as the main source of nuclear uncertainty in the production of $^{26}$Al in C/Ne explosive burning in massive stars, which has been suggested to be the main source of $^{26}$Al in the Galaxy. We studied this reaction through neutron spectroscopy at the CN Van de Graaff accelerator of the Legnaro National Laboratories. Thanks to this technique we are able to discriminate the ($\alpha$,n) events from possible contamination arising from parasitic reactions. In particular, we measured the neutron angular distributions at 5 different beam energies (between 3 and 5 MeV) in the \ang{17.5}-\ang{106} laboratory system angular range. The presented results disagree with the assumptions introduced in the analysis of a previous experiment., Comment: 9 pages, 9 figures - accepted by EPJA
Published: 2014
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23. First Direct Measurement of theH2(α,γ)Li6Cross Section at Big Bang Energies and the Primordial Lithium Problem

Author: C. Mazzocchi, Carlo Broggini, T. Davinson, C. Rossi Alvarez, Daniel Bemmerer, A. Bellini, R. Menegazzo, Tamás Szücs, Paolo Prati, Antonio Caciolli, E. Somorjai, P. Corvisiero, Douglas Scott, M. Erhard, Davide Trezzi, M. Anders, Michele Marta, M. Junker, A. Lemut, C. Gustavino, Zs. Fülöp, Oscar Straniero, Marialuisa Aliotta, A. Guglielmetti, Gyuri Gyürky, G. Gervino, A. Formicola, Z. Elekes, and H. Costantini
Subjects: Physics, Nuclear physics, Stars, Low energy, Big Bang nucleosynthesis, Isoscalar, Coulomb, General Physics and Astronomy, Coulomb barrier, Halo, Atomic physics, Electric dipole transition
Abstract: Recent observations of $^{6}\mathrm{Li}$ in metal poor stars suggest a large production of this isotope during big bang nucleosynthesis (BBN). In standard BBN calculations, the $^{2}\mathrm{H}(\ensuremath{\alpha},\ensuremath{\gamma})^{6}\mathrm{Li}$ reaction dominates $^{6}\mathrm{Li}$ production. This reaction has never been measured inside the BBN energy region because its cross section drops exponentially at low energy and because the electric dipole transition is strongly suppressed for the isoscalar particles $^{2}\mathrm{H}$ and $\ensuremath{\alpha}$ at energies below the Coulomb barrier. Indirect measurements using the Coulomb dissociation of $^{6}\mathrm{Li}$ only give upper limits owing to the dominance of nuclear breakup processes. Here, we report on the results of the first measurement of the $^{2}\mathrm{H}(\ensuremath{\alpha},\ensuremath{\gamma})^{6}\mathrm{Li}$ cross section at big bang energies. The experiment was performed deep underground at the LUNA 400 kV accelerator in Gran Sasso, Italy. The primordial $^{6}\mathrm{Li}/^{7}\mathrm{Li}$ isotopic abundance ratio has been determined to be $(1.5\ifmmode\pm\else\textpm\fi{}0.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$, from our experimental data and standard BBN theory. The much higher $^{6}\mathrm{Li}/^{7}\mathrm{Li}$ values reported for halo stars will likely require a nonstandard physics explanation, as discussed in the literature.
Published: 2014
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24. A new study of the22Ne(p, Î³)23Na reaction deep underground: Feasibility, setup and first observation of the 186 keV resonance

Author: P. Corvisiero, G. Gervino, Thomas Davinson, Rosanna Depalo, Douglas Scott, A. Formicola, C. Rossi Alvarez, C. Gustavino, M. Junker, C. G. Bruno, Gianluca Imbriani, Oscar Straniero, Marialuisa Aliotta, Davide Trezzi, Tamás Szücs, Paolo Prati, E. Somorjai, Antonio Caciolli, A. Guglielmetti, M. L. Menzel, Zs. Fülöp, Carlo Broggini, Daniel Bemmerer, Gy. Gyürky, A. Di Leva, R. Menegazzo, F. Cavanna, F. Ferraro, Frank Strieder, M. Anders, Z. Elekes, Cavanna, F, Depalo, R., Menzel, M. L., Aliotta, M., Anders, M., Bemmerer, D., Broggini, C., Bruno, C. G., Caciolli, A., Corvisiero, P., Davinson, T., DI LEVA, Antonino, Elekes, Z., Ferraro, F., Formicola, A., Fülöp, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, G. y., Imbriani, Gianluca, Junker, M., Menegazzo, R., Prati, P., Rossi Alvarez, C., Scott, D. A., Somorjai, E., Straniero, O., Strieder, F., Szücs, T., and Trezzi, D.
Subjects: Physics, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Proton, Hydrogen, astrofisica nucleare, fisica, Resonance, chemistry.chemical_element, fisica underground, Nuclear physics, Neon, chemistry, fisica sperimentale, Astrophysics - Solar and Stellar Astrophysics, Nucleosynthesis, Nuclear astrophysics, Nuclear fusion, Nuclear Experiment, Beam (structure), Nuclear Physics
Abstract: The $^{22}$Ne(p,$\gamma$)$^{23}$Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle is active in asymptotic giant branch stars as well as in novae and contributes to the nucleosythesis of neon and sodium isotopes. In order to reduce the uncertainties in the predicted nucleosynthesis yields, new experimental efforts to measure the $^{22}$Ne(p,$\gamma$)$^{23}$Na cross section directly at the astrophysically relevant energies are needed. In the present work, a feasibility study for a $^{22}$Ne(p,$\gamma$)$^{23}$Na experiment at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400\,kV accelerator deep underground in the Gran Sasso laboratory, Italy, is reported. The ion beam induced $\gamma$-ray background has been studied. The feasibility study led to the first observation of the $E_{\rm p}$ = 186\,keV resonance in a direct experiment. An experimental lower limit of 0.12\,$\times$\,10$^{-6}$\,eV has been obtained for the resonance strength. Informed by the feasibility study, a dedicated experimental setup for the $^{22}$Ne(p,$\gamma$)$^{23}$Na experiment has been developed. The new setup has been characterized by a study of the temperature and pressure profiles. The beam heating effect that reduces the effective neon gas density due to the heating by the incident proton beam has been studied using the resonance scan technique, and the size of this effect has been determined for a neon gas target., Comment: Minor errors corrected; final version
Published: 2014

25. First direct measurement of the H 2 (Î±,Î³) Li 6 cross section at big bang energies and the primordial lithium problem

Author: M, Anders, D, Trezzi, R, Menegazzo, M, Aliotta, A, Bellini, D, Bemmerer, C, Broggini, A, Caciolli, P, Corvisiero, H, Costantini, T, Davinson, Z, Elekes, M, Erhard, A, Formicola, Zs, Fülöp, G, Gervino, A, Guglielmetti, C, Gustavino, Gy, Gyürky, M, Junker, A, Lemut, M, Marta, C, Mazzocchi, P, Prati, C, Rossi Alvarez, D A, Scott, E, Somorjai, O, Straniero, and T, Szücs
Subjects: LUNA, Underground nuclear astrophysics, Physics and Astronomy (all), nuclear astrophysics, fisica underground, big-bang nucleosynthesis, Big Bang nucleosynthesis
Abstract: Recent observations of (6)Li in metal poor stars suggest a large production of this isotope during big bang nucleosynthesis (BBN). In standard BBN calculations, the (2)H(α,γ)(6)Li reaction dominates (6)Li production. This reaction has never been measured inside the BBN energy region because its cross section drops exponentially at low energy and because the electric dipole transition is strongly suppressed for the isoscalar particles (2)H and α at energies below the Coulomb barrier. Indirect measurements using the Coulomb dissociation of (6)Li only give upper limits owing to the dominance of nuclear breakup processes. Here, we report on the results of the first measurement of the (2)H(α,γ)(6)Li cross section at big bang energies. The experiment was performed deep underground at the LUNA 400 kV accelerator in Gran Sasso, Italy. The primordial (6)Li/(7)Li isotopic abundance ratio has been determined to be (1.5 ± 0.3) × 10(-5), from our experimental data and standard BBN theory. The much higher (6)Li/(7)Li values reported for halo stars will likely require a nonstandard physics explanation, as discussed in the literature.
Published: 2014

26. Measurement of the25Mg(α,n)28Si reaction cross section at LNL

Author: Tommaso Marchi, R. Menegazzo, F. Gramegna, S. Appannababu, F. Camera, M. Cinausero, P. F. Mastinu, G. Collanzuol, N. Blasi, G. Montagnoli, D. Fabris, V. L. Kravchuk, G. Prete, C. Broggini, V. Rigato, Rosanna Depalo, O. Wieland, Mario Leone, Augusto Lombardi, Antonio Caciolli, and C. Rossi Alvarez
Subjects: Physics, Nuclear reaction, QC1-999, chemistry.chemical_element, Galaxy, Interstellar medium, Physics and Astronomy (all), Cross section (physics), Neon, Stars, chemistry, Nucleosynthesis, Emission spectrum, Atomic physics
Abstract: The detection of the 1809 keV emission line associated with the decay of 26 Al in the interstellar medium provides a direct evidence of recent nucleosynthesis events in our galaxy. 26 Al is thought to be mainly produced in massive stars, but in order to have a quantita- tive understanding of the 26 Al distribution, the cross section of all the nuclear reactions involved in its production should be accurately known. A recent sensitivity study demonstrated that the 25 Mg( ,n) 28 Si is the reaction with the strongest impact on the synthesis of 26 Al during explosive Neon and Carbon burning (4). In order to improve the experimental knowledge of the 25 Mg( ,n) 28 Si cross section, a new direct measurement has been performed at Legnaro National Laboratories. The experimental setup, the data analysis and preliminary results are discussed.
Published: 2014

27. 3He(alpha,gamma)7Be cross section at low energies

Author: G.Y. GYÜRKY, F. CONFORTOLA, H. COSTANTINI, A. FORMICOLA, D. BEMMERER, R. BONETTI, C. BROGGINI, P. CORVISIERO, Z. ELEKES, Z.S. FÜLÖP, G. GERVINO, A. GUGLIELMETTI, C. GUSTAVINO, G. IMBRIANI, M. JUNKER, M. LAUBENSTEIN, A. LEMUT, B. LIMATA, M. MARTA, R. MENEGAZZO, P. PRATI, V. ROCA, C. ROLFS, C. ROSSI ALVAREZ, E. SOMORJAI, O. STRANIERO, F. STRIEDER, F. TERRASI, H. P. TRAUTVETTER, LOZZA, VALENTINA, Gyürky, G. Y., F., Confortola, H., Costantini, A., Formicola, D., Bemmerer, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fülöp, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, Lozza, Valentina, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, and H. P., Trautvetter
Subjects: Astrophysics (astro-ph), FOS: Physical sciences, Nuclear Experiment (nucl-ex), Astrophysics, Nuclear Experiment
Abstract: The flux of 7Be and 8B neutrinos from the Sun and the production of 7Li via primordial nucleosynthesis depend on the rate of the 3He(alpha,gamma)7Be reaction. In extension of a previous study showing cross section data at 127 - 167 keV center of mass energy, the present work reports on a measurement of the 3He(alpha,gamma)7Be cross section at 106 keV performed at Italy's Gran Sasso underground laboratory by the activation method. This energy is closer to the solar Gamow energy than ever reached before. The result is sigma = 0.567 +- 0.029(stat) +- 0.016(syst) nbarn. The data are compared with previous activation studies at high energy, and a recommended S(0) value for all 3He(alpha,gamma)7Be activation studies, including the present work, is given., Accepted for publication in PRC
Published: 2007

28. Astrophysical S factor of the 3He(alpha,gamma)7Be reaction measured at low energy via detection of prompt and delayed gamma rays

Author: F. CONFORTOLA, D. BEMMERER, H. COSTANTINI, A. FORMICOLA, G.Y. GYÜRKY, P. BEZZON, R. BONETTI, C. BROGGINI, P. CORVISIERO, Z. ELEKES, Z.S. FÜLÖP, G. GERVINO, A. GUGLIELMETTI, C. GUSTAVINO, G. IMBRIANI, M. JUNKER, M. LAUBENSTEIN, A. LEMUT, B. LIMATA, M. MARTA, R. MENEGAZZO, P. PRATI, V. ROCA, C. ROLFS, C. ROSSI ALVAREZ, E. SOMORJAI, O. STRANIERO, F. STRIEDER, F. TERRASI, H. P. TRAUTVETTER, LOZZA, VALENTINA, F., Confortola, D., Bemmerer, H., Costantini, A., Formicola, Gyürky, G. Y., P., Bezzon, R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fülöp, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, Lozza, Valentina, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, and H. P., Trautvetter
Published: 2007

29. Measurement of 25Mg(p; gamma)26Al resonance strengths via gamma spectrometry

Author: A. Formicola, BEST, ANDREAS, M. Junker, D. Bemmerer, R. Bonetti, C. Broggini, A. Caciolli, F. Confortola, P. Corvisiero, H. Costantini, Z. Elekes, Z. Fulop, G. Gervino, A. Guglielmetti, G. Gyürky, C. Gustavino, A. Lemut, M. Marta, C. Mazzocchi, R. Menegazzo, P. Prati, C. Rolfs, C. Rossi Alvarez, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. T.r.a.u.t.v.e.t.t.e.r. In: Journal of physics G. : nuclear, particle p.h.y.s.i.c.s. ISSN 0954 3.8.9.9. 3.5.:.1. p. 014013 0.1.4.0.1.3., IMBRIANI, GIANLUCA, LIMATA, BENEDICTA NORMANNA, ROCA, VINCENZO, A., Formicola, Best, Andrea, Imbriani, Gianluca, M., Junker, D., Bemmerer, R., Bonetti, C., Broggini, A., Caciolli, F., Confortola, P., Corvisiero, H., Costantini, Z., Eleke, Z., Fulop, G., Gervino, A., Guglielmetti, G., Gyürky, C., Gustavino, A., Lemut, Limata, BENEDICTA NORMANNA, M., Marta, C., Mazzocchi, R., Menegazzo, P., Prati, Roca, Vincenzo, C., Rolf, C., Rossi Alvarez, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, nuclear, H. P. T. r. a. u. t. v. e. t. t. e. r. In: Journal of physics G., and Particle, p. h. y. s. i. c. s. ISSN 0954 3. 8. 9. 9. 3. 5. :. 1. p. 014013 0. 1. 4. 0. 1. 3.
Subjects: Physics, Nuclear and High Energy Physics, COSMIC cancer database, Photon, Detector, Resonance, FOS: Physical sciences, Mass spectrometry, Galaxy, Nuclear physics, Underground laboratory, Mg abbundance, Nuclear Experiment (nucl-ex), Hpge detector, Nuclear Experiment, nuclear astrophysic
Abstract: The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determing the sources of interstellar 26Al. The predicted 26Al is too low compared to the observation, for a better understanding more accurate rates for the 25Mg(p; gamma)26Al reaction are required. The 25Mg(p;gamma)26Al reaction has been investigated at the resonances at Er= 745; 418; 374; 304 keV at Ruhr-Universitat-Bochum using a Tandem accelerator and a 4piNaI detector. In addition the resonance at Er = 189 keV has been measured deep underground laboratory at Laboratori Nazionali del Gran Sasso, exploiting the strong suppression of cosmic background. This low resonance has been studied with the 400 kV LUNA accelerator and a HPGe detector. The preliminary results of the resonance strengths will be reported., Comment: Accepted for publication in Journal of Physics G
Published: 2007
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30. Activation Measurement of the 3He(alpha,gamma)7Be Cross Section at Low Energy

Author: D. BEMMERER, F. CONFORTOLA, H. COSTANTINI, A. FORMICOLA, G. GYURKY, R. BONETTI, C. BROGGINI, P. CORVISIERO, Z. ELEKES, Z. FULOP, G. GERVINO, A. GUGLIELMETTI, C. GUSTAVINO, M. JUNKER, M. LAUBENSTEIN, A. LEMUT, B. LIMATA, V. LOZZA, M. MARTA, R. MENEGAZZO, P. . PRATI, C. ROLFS, C. ROSSI ALVAREZ, E. SOMORJAI, O. STRANIERO, F. STRIEDER, F. TERRASI, H. P. TRAUTVETTER, IMBRIANI, GIANLUCA, ROCA, VINCENZO, D., Bemmerer, F., Confortola, H., Costantini, A., Formicola, Gyürky, G. Y., R., Bonetti, C., Broggini, P., Corvisiero, Z., Eleke, Fülöp, Z. S., G., Gervino, A., Guglielmetti, C., Gustavino, G., Imbriani, M., Junker, M., Laubenstein, A., Lemut, B., Limata, Lozza, Valentina, M., Marta, R., Menegazzo, P., Prati, V., Roca, C., Rolf, C., ROSSI ALVAREZ, E., Somorjai, O., Straniero, F., Strieder, F., Terrasi, H. P., Trautvetter, G., Gyurky, Z., Fulop, Imbriani, Gianluca, V., Lozza, Prati, P., and Roca, Vincenzo
Subjects: Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Nuclear Experiment (nucl-ex), Astrophysics, Nuclear Experiment
Abstract: The nuclear physics input from the 3He(alpha,gamma)7Be cross section is a major uncertainty in the fluxes of 7Be and 8B neutrinos from the Sun predicted by solar models and in the 7Li abundance obtained in big-bang nucleosynthesis calculations. The present work reports on a new precision experiment using the activation technique at energies directly relevant to big-bang nucleosynthesis. Previously such low energies had been reached experimentally only by the prompt-gamma technique and with inferior precision. Using a windowless gas target, high beam intensity, and low background gamma-counting facilities, the 3He(alpha,gamma)7Be cross section has been determined at 127, 148, and 169 keV center-of-mass energy with a total uncertainty of 4%. The sources of systematic uncertainty are discussed in detail. The present data can be used in big-bang nucleosynthesis calculations and to constrain the extrapolation of the 3He(alpha,gamma)7Be astrophysical S factor to solar energies.
Published: 2006

31. CNO hydrogen burning studied deep underground

Author: C. Rolfs, Daniel Bemmerer, Gy. Gyürky, Carlo Broggini, C. Rossi Alvarez, R. Menegazzo, R. Bonetti, F. Schümann, H. P. Trautvetter, G. Gervino, B. Limata, Gianluca Imbriani, Oscar Straniero, Frank Strieder, Filippo Terrasi, João Cruz, A. P. Jesus, F. Confortola, M. Junker, A. Guglielmetti, Mario R. Romano, A. Formicola, Zs. Fülöp, A. Lemut, H. Costantini, Detlef Rogalla, C. Gustavino, Vincenzo Roca, Paolo Prati, E. Somorjai, P. Corvisiero, Bemmerer, D., Confortola, F., Lemut, A., Bonetti, R., Broggini, C., Corvisiero, P., Costantini, H., Cruz, J., Formicola, A., Fulop, Z. s., Gervino, G., Guglielmetti, A., Gustavino, C., Gyurky, G. y., Imbriani, Gianluca, Jesus, A. P., Junker, M., Limata, B., Menegazzo, R., Prati, P., Roca, Vincenzo, Rogalla, D., Rolfs, C., Romano, Mario, Rossi Alvarez, C., Schuemann, F., Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., D., Bemmerer, A., Lemut, R., Bonetti, C., Broggini, P., Corvisiero, H., Costantini, J., Cruz, A., Formicola, Z., Fulop, G., Gervino, A., Guglielmetti, C., Gustavino, G., Gyurky, G., Imbriani, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, V., Roca, D., Rogalla, C., Rolf, M., Romano, C., ROSSI ALVAREZ, F., Schu, Mann, E., Somorjai, O., Straniero, F., Strieder, Terrasi, Filippo, and H. P., Trautvetter
Subjects: Physics, Nuclear and High Energy Physics, CNO cycle, Hydrogen, and linear accelerators - X- and γ-ray spectroscopy, collective, Extrapolation, chemistry.chemical_element, Alpha particle, Radiative capture - Hydrostatic stellar nucleosynthesis - Electrostatic, Nuclear physics, chemistry, Excited state, Nuclear astrophysics, Nuclear fusion, Atomic physics, Ground state
Abstract: In stars, four hydrogen nuclei are converted into a helium nucleus in two competing nuclear fusion processes, namely the proton-proton chain (p-p chain) and the carbon-nitrogen-oxygen (CNO) cycle. For temperatures above 20 million kelvin, the CNO cycle dominates energy production, and its rate is determined by the slowest process, the 14N(p,γ)15O radiative capture reaction. This reaction proceeds through direct and resonant capture into the ground state and several excited states in 15O. High energy data for capture into each of these states can be extrapolated to stellar energies using an R-matrix fit. The results from several recent extrapolation studies are discussed. A new experiment at the LUNA (Laboratory for Underground Nuclear Astrophysics) 400kV accelerator in Italy's Gran Sasso laboratory measures the total cross section of the 14N(p,γ)15O reaction with a windowless gas target and a 4π BGO summing detector, down to center of mass energies as low as 70keV. After reviewing the characteristics of the LUNA facility, the main features of this experiment are discussed, as well as astrophysical scenarios where cross section data in the energy range covered have a direct impact, without any extrapolation.
Published: 2006

32. First measurement of the 14N(p,gamma)15O cross section down to 70 keV

Author: Carlo Broggini, Gianluca Imbriani, R. Bonetti, C. Rossi Alvarez, F. Confortola, Oscar Straniero, A. Guglielmetti, Filippo Terrasi, Daniel Bemmerer, Vincenzo Roca, João Cruz, B. Limata, Frank Strieder, Paolo Prati, G. Gervino, H. Costantini, P. Corvisiero, A. Formicola, A. P. Jesus, Zs. Fülöp, E. Somorjai, Gy. Gyürky, C. Rolfs, Detlef Rogalla, F. Schümann, C. Gustavino, Roberto Menegazzo, H. P. Trautvetter, M. Junker, Mario R. Romano, A. Lemut, A., Lemut, D., Bemmerer, F., Confortola, R., Bonetti, C., Broggini, Corvisiero, _. P., H., Costantini, J., Cruz, A., Formicola, Fulop, Z. s., G., Gervino, A., Guglielmetti, C., Gustavino, Gyurky, G. y., Imbriani, Gianluca, A. P., Jesu, M., Junker, B., Limata, R., Menegazzo, P., Prati, Roca, Vincenzo, D., Rogalla, C., Rolf, Romano, Mario, C., Rossi Alvarez, F., Shumann, E., Somorjai, O., Straniero, F., Strieder, and F., Terrasi
Subjects: Nuclear and High Energy Physics, CNO cycle, Explosive material, Hydrogen, Cross section measurement, 14N(p, γ)15O, AGB stars, Hydrogen shell burning, Radiative capture, Underground nuclear astrophysics, Thermonuclear reaction, chemistry.chemical_element, FOS: Physical sciences, Astrophysics, Resonance (particle physics), γ)15O, Nuclear physics, Cross section (physics), 14N(p, Nuclear Experiment (nucl-ex), Nuclear Experiment, Physics, Detector, Astrophysics (astro-ph), Stars, chemistry, Atomic physics
Abstract: In stars with temperatures above 20 × 10 6 K , hydrogen burning is dominated by the CNO cycle. Its rate is determined by the slowest process, the 14N(p, γ)15O reaction. Deep underground in Italy's Gran Sasso laboratory, at the LUNA 400 kV accelerator, the cross section of this reaction has been measured at energies much lower than ever achieved before. Using a windowless gas target and a 4π BGO summing detector, direct cross section data has been obtained down to 70 keV, reaching a value of 0.24 picobarn. The Gamow peak has been covered by experimental data for several scenarios of stable and explosive hydrogen burning. In addition, the strength of the 259 keV resonance has been remeasured. The thermonuclear reaction rate has been calculated for temperatures 90 – 300 × 10 6 K , for the first time with negligible impact from extrapolations.
Published: 2006
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33. Uranium distribution in the Variscan Basement of Northeastern Sardinia

Author: M. Kaçeli Xhixha, M. Albèri, M. Baldoncini, G.P. Bezzon, G.P. Buso, I. Callegari, L. Casini, S. Cuccuru, G. Fiorentini, E. Guastaldi, F. Mantovani, L. Mou, G. Oggiano, A. Puccini, C. Rossi Alvarez, V. Strati, G. Xhixha, A. Zanon, M. Kaçeli Xhixha, M. Albèri, M. Baldoncini, G.P. Bezzon, G.P. Buso, I. Callegari, L. Casini, S. Cuccuru, G. Fiorentini, E. Guastaldi, F. Mantovani, L. Mou, G. Oggiano, A. Puccini, C. Rossi Alvarez, V. Strati, G. Xhixha, and A. Zanon
Published: 2015
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34. Total natural radioactivity, Veneto (Italy)

Author: V. Strati, M. Baldoncini, G.P. Bezzon, C. Broggini, G.P. Buso, A. Caciolli, I. Callegari, L. Carmignani, T. Colonna, G. Fiorentini, E. Guastaldi, M. Kaçeli Xhixha, F. Mantovani, R. Menegazzo, L. Mou, C. Rossi Alvarez, G. Xhixha, A. Zanon, V. Strati, M. Baldoncini, G.P. Bezzon, C. Broggini, G.P. Buso, A. Caciolli, I. Callegari, L. Carmignani, T. Colonna, G. Fiorentini, E. Guastaldi, M. Kaçeli Xhixha, F. Mantovani, R. Menegazzo, L. Mou, C. Rossi Alvarez, G. Xhixha, and A. Zanon
Published: 2015
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35. Excited states in52Feand the origin of the yrast trap atIπ=12+

Author: M. De Poli, A. Gadea, S. M. Lenzi, D. Bazzacco, S. Lunardi, D. M. Brink, G. de Angelis, P. Pavan, C. E. Svensson, E. Caurier, Gabriel Martínez-Pinedo, F. Brandolini, C. Rossi Alvarez, J. A. Cameron, C. A. Ur, M. A. Nagarajan, D. R. Napoli, N. Marginean, and D. Bucurescu
Subjects: Physics, Nuclear and High Energy Physics, Yrast, Spectroscopy methods, Excited state, SHELL model, Nuclear structure, Parity (physics), Atomic physics, Beam energy, Excitation
Abstract: Excited states in ${}^{52}\mathrm{Fe}$ have been studied up to spin $10\ensuremath{\Elzxh}$ in the reaction ${}^{28}\mathrm{Si}{+}^{28}\mathrm{Si}$ at 115 MeV beam energy by using in-beam $\ensuremath{\gamma}$-ray spectroscopy methods at the GASP array. The excitation energy of the yrast ${10}^{+}$ state is 7.381 MeV, almost 0.5 MeV above the well known ${\ensuremath{\beta}}^{+}$-decaying yrast ${12}^{+}$ state. Experimental upper limits for the $B(E4)$ transition probabilities from the ${12}^{+}$ isomer to the ${8}_{1}^{+}$ and ${8}_{2}^{+}$ states have been determined. The mean lifetimes of five excited states have been measured by using the Doppler shift attenuation method. Complete diagonalizations in the $\mathrm{pf}$ major shell lead to very good agreement with the experimental level scheme and transition probabilities. The lifetime, $\mathrm{log}\mathrm{ft}$ value, branching ratios, and $B(E4)$ values are calculated for the ${12}^{+}$ isomer. The positive parity states are also interpreted in terms of a Nilsson projected method. The structure of the yrast levels of ${}^{52}\mathrm{Fe}$ is compared with those of its cross conjugate ${}^{44}\mathrm{Ti}.$
Published: 1998
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36. Delayed alignment in the N = Z nucleus 72Kr

Author: S. Skoda, P. G. Bizzeti, M. De Poli, T. Martinez, Claes Fahlander, J. Eberth, A. Gadea, A. M. Bizzeti-Sona, W. Gelletly, G. de Angelis, Dirk Rudolph, D. Bazzacco, P. Pavan, F. Brandolini, F. Becker, Ani Aprahamian, D. Foltescu, B. Rubio, W. Satula, D. R. Napoli, S. Lunardi, C. M. Petrache, Ramon Wyss, C. Rossi Alvarez, D. De Acuña, E. Farnea, C. A. Ur, P. Spolaore, S. M. Lenzi, and H.G. Thomas
Subjects: Physics, Coupling, Nuclear and High Energy Physics, medicine.anatomical_structure, Spins, Isotope, Pairing, Degrees of freedom (physics and chemistry), medicine, Atomic physics, Beam energy, Nucleus, Excitation
Abstract: The structure of Kr-72 has been investigated at GASP through the Ca-40(Ca-40,2 alpha) reaction at a beam energy of 160 MeV using the 4 pi ISIS Si-ball for reaction channel selection. The level scheme has been extended up to an excitation energy of approximate to 8.5 MeV. The spins and parities of the observed levels are assigned tentatively. The observed band shows the predicted change from oblate to prolate shape. The four quasi-particle g(9/2) alignment is found to be significantly delayed in rotational frequency with respect to the heavier Kr isotopes. Such a delay contradicts the predictions of standard mean-field calculations and may reflect either additional correlations in the T = 0 pairing channel or coupling to vibrational degrees of freedom or both. (C) 1997 Elsevier Science B.V. (Less)
Published: 1997
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37. Neutron-induced background by an Î±-beam incident on a deuterium gas target and its implications for the study of the2H(Î±, Î³)6Li reaction at LUNA

Author: M. Erhard, Davide Trezzi, M. Anders, H. Costantini, Oscar Straniero, M. Marta, Marialuisa Aliotta, R. Menegazzo, T. Davinson, Paolo Prati, Z. Elekes, Douglas Scott, Tamás Szücs, C. Gustavino, A. Bellini, Daniel Bemmerer, M. Junker, P. Corvisiero, Zs. Fülöp, A. Formicola, A. Lemut, Antonio Caciolli, E. Somorjai, Carlo Broggini, C. Mazzocchi, C. Rossi Alvarez, G. Gervino, A. Guglielmetti, and Gy. Gyürky
Subjects: Big Bang, Physics, Elastic scattering, Nuclear and High Energy Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Semiconductor detector, Nuclear physics, Big Bang nucleosynthesis, Deuterium, Neutron flux, Neutron source, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract: The production of the stable isotope Li-6 in standard Big Bang nucleosynthesis has recently attracted much interest. Recent observations in metal-poor stars suggest that a cosmological Li-6 plateau may exist. If true, this plateau would come in addition to the well-known Spite plateau of Li-7 abundances and would point to a predominantly primordial origin of Li-6, contrary to the results of standard Big Bang nucleosynthesis calculations. Therefore, the nuclear physics underlying Big Bang Li-6 production must be revisited. The main production channel for Li-6 in the Big Bang is the 2H(alpha,gamma)6Li reaction. The present work reports on neutron-induced effects in a high-purity germanium detector that were encountered in a new study of this reaction. In the experiment, an {\alpha}-beam from the underground accelerator LUNA in Gran Sasso, Italy, and a windowless deuterium gas target are used. A low neutron flux is induced by energetic deuterons from elastic scattering and, subsequently, the 2H(d,n)3He reaction. Due to the ultra-low laboratory neutron background at LUNA, the effect of this weak flux of 2-3 MeV neutrons on well-shielded high-purity germanium detectors has been studied in detail. Data have been taken at 280 and 400 keV alpha-beam energy and for comparison also using an americium-beryllium neutron source., Comment: Submitted to EPJA; 13 pages, 8 figures
Published: 2013

38. Alpha particles in coincidence with the superdeformed band in 150Tb

Author: D. Fabris, S. Lunardi, D. Bazzacco, M. Cinausero, Marcello Lunardon, G. de Angelis, E. Fioretto, R. Burch, C. Rossi Alvarez, G. Nebbia, Giuseppe Viesti, G. Prete, E. Farnea, G. Vedovato, and Nilberto H. Medina
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Angular momentum, Alpha particle, Atomic physics, Coincidence, Spectral line
Abstract: Alpha particle spectra in coincidence both with normal deformed (ND) and superdeformed (SD) bands of 150 Tb have been measured using the reaction 120 Sn( 37 Cl,α3n) at 187 MeV bombarding energy. A clear difference is observed between the two spectra, that in coincidence with the SD states being shifted to lower energies. This effect is understood in terms of different angular momentum regions from which the ND and SD states orginate. The standard statistical model fails to describe the angular momentum dependence of the alpha particle energies.
Published: 1996
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39. First allowed bandcrossing in neutron deficient nucleus 141Tb

Author: Fernando Rodolfo Espinoza-Quiñones, Zsolt Podolyak, C. M. Petrache, C. A. Ur, M. Ionescu-Bujor, A. Gadea, J. R. B. Oliveira, Roberto Vicençotto Ribas, M. De Poli, E. W. Cybulska, C. Rossi-Alvarez, F. Soramel, Marcia de Almeida Rizzutto, P. Spolaore, D. Bazzacco, D. De Acuña, A. Iordachescu, E. Farnea, M. N. Rao, F. Brandolini, G. de Angelis, D. Foltescu, W. A. Seale, S. Lunardi, María Angélica Cardona, D. R. Napoli, and Nilberto H. Medina
Subjects: Physics, Yrast, Nuclear Theory, General Physics and Astronomy, Rotational frequency, Nuclear physics, medicine.anatomical_structure, Excited state, medicine, Physics::Accelerator Physics, Incident energy, Neutron, Nuclear Experiment, Nucleus
Abstract: The neutron deficient 141Tb nucleus has been studied with the 92Mo (54Fe, alphap) reaction at 240-MeV incident energy and the multidetector array GASP. For the yrast pih11/2 decoupled band, excited states up to 6.7 MeV and spin up to 47/2- have been observed. This band presents an upbend at rotational frequency of omega = 0.38 MeV due to the alignment of h11/2 protons. The results are discussed in terms of the Cranking model.
Published: 2004
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40. Tilted axis rotation, candidates for chiral bands, and wobbling motion in138Nd

Author: S. Lunardi, C. M. Petrache, C. A. Ur, E. Farnea, Masayuki Matsuzaki, C. Rossi Alvarez, S. Frauendorf, R. Leguillon, R. Venturelli, G. de Angelis, T. Zerrouki, D. Bazzacco, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Spins, 010308 nuclear & particles physics, Parity (physics), 21.10.Re, 21.60.Ev, 23.20.Lv, 27.60.+j, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Dipole, Classical mechanics, Coincident, Pairing, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Principal axis theorem
Abstract: High-spin states in ${}^{138}$Nd were investigated using the reaction ${}^{94}$Zr(${}^{48}\mathrm{Ca},4n$), detecting coincident $\ensuremath{\gamma}$ rays with the gasp spectrometer. A rich level scheme was constructed including four bands of negative parity at low spins, eight bands of dipole transitions, and eight bands of quadrupole transitions at medium spins. The cranked shell model and the tilted-axis cranking model are used to assign configurations to the observed bands, where zero pairing is assumed. For selected configurations the case of finite pairing is also considered. A consistent notation for configuration assignment that applies for both zero and finite pairing is introduced. The observed bands are interpreted as rotation around the short and long principal axes (quadrupole bands), as well as around a tilted axis (dipole bands). The dipole bands have an intermediate character, between magnetic and collective electric rotation. A pair of dipole bands is identified as candidates for chiral partners. The possible existence of the wobbling mode at low deformation and medium spins is discussed. The consistent interpretation of the multitude of observed bands strongly supports the existence of stable triaxial deformation at medium spins in ${}^{138}$Nd.
Published: 2012
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41. AGATA-Advanced GAmma Tracking Array

Author: A. Colombo, Y. Mariette, A. Johnson, W. Korten, A. Brondi, T. Faul, J. Robin, R. Depalo, M. Slee, J. Gre¸bosz, H. C. Boston, H. Harroch, B. Rossé, M. Filliger, M. Gulmini, A. Korichi, S. Brambilla, J.R. Cresswell, C. Parisel, P. Edelbruck, F. Ameil, F. Camera, C. Oziol, Matthew Richard Dimmock, G. Salvato, F. Morbiducci, J. Ropert, M. Borsato, E. Legay, Marco Bellato, C. Santos, Gheorghe Pascovici, L. Charles, J. Pancin, G. Casati, P. G. Bizzeti, T. Stanios, S. Lhenoret, Diego Barrientos, P.M. Jones, Andreas Görgen, V. Chambert, S. Aydin, K. Hauschild, B. Hervieu, R. Nicolini, J. Simpson, H. J. Wollersheim, L. Lavergne, Pär-Anders Söderström, G. S. Simpson, G. Jaworski, F. Filmer, R. Griffiths, P.S. Morrall, M. Petcu, G. Lo Bianco, D. Linget, A. Givechev, D. C. Oxley, M. Kogimtzis, F. Salomon, J. Jolie, D. Wells, S. Moon, C. Aufranc, A. Corsi, T. Descombes, N. Goel, J. Thornhill, N. Warr, Serkan Akkoyun, B. Birkenbach, F. Dorangeville, Joël Chavas, P. Medina, Roberto Isocrate, C. Weber, E. Merchan, Bo Cederwall, I. Kojouharov, Enrique Sanchis, A. Lopez-Martens, Oliver Wieland, F. Le Blanc, D. Seddon, S. C. Letts, D. Bazzacco, J. Leske, B. Bruyneel, Alberto Pullia, L. Nelson, G. La Rana, B. Travers, I. Burrows, G. Maron, S. Coelli, J. J. Valiente-Dobón, F. Saillant, Piotr Bednarczyk, V.L. Ngo, J. Mierzejewski, Norbert Pietralla, R.S. Kempley, N. Kurz, M. Rebeschini, S. Fantinel, D. L. Balabanski, A. J. Boston, F. Tomasi, R. Berthier, M. D. Salsac, B. Dulny, C. Stahl, N. Dosme, C. Fanin, R. Baumann, S. Pietri, A. Astier, M. Nicoletto, J. van der Marel, A. Bracco, Björn Jonson, D. Mengoni, D. Bloor, Luna Pellegri, F. Lefebvre, D. Pugnére, J. Egea, S. Cabaret, D. Curien, M. Reese, C. Commeaux, Dirk Rudolph, A. Giannatiempo, F. Recchia, L. Ramina, A. Lermitage, C. A. Ur, R. M. Lieder, I.P. Brawn, R. Menegazzo, R. Raine, Krasimir Mitev, D. R. Napoli, G. Suliman, M. Kebbiri, Y. Drouen, Susan Rigby, W. Me¸czyński, R. Wadsworth, F. 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P.] Univ Manchester, Sch Phys & Astron, Schuster Lab, Manchester M13 9PL, Lancs, England -- [Depalo, R.] Univ Padua, Dipartimento Astron, IT-35131 Padua, Italy -- [Descombes, T. -- Simpson, G.] Univ Grenoble 1, CNRS, IN2P3, LPSC,INP Grenoble, F-38026 Grenoble, France -- [Doncel, M. -- Hernandez-Prieto, A. -- Quintana, B.] Univ Salamanca, Dept Fis Fundamental, E-37008 Salamanca, Spain -- [Erduran, M. N. -- Ince, E.] Istanbul Univ, Istanbul, Turkey -- [Erturk, S.] Nigde Univ, Fac Sci, Dept Phys, TR-51200 Nigde, Turkey -- [Gast, W. -- Lieder, R. M. -- Mihailescu, L.] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany -- [Gernhaeuser, R. -- Klupp, S. -- Kruecken, R. -- Schlarb, M.] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany -- [Jaworski, G.] Warsaw Univ Technol, Fac Phys, PL-00662 Warsaw, Poland -- [Jaworski, G. -- Mierzejewski, J. -- Palacz, M.] Univ Warsaw, Heavy Ion Lab, PL-02093 Warsaw, Poland -- [Jones, P.] Univ Jyvaskyla, Dept Phys, FI-40014 Jyvaskyla, Finland -- [Jonson, B.] Chalmers, S-41296 Gothenburg, Sweden -- [Jungclaus, A. -- Orlandi, R.] CSIC, Inst Estruct Mat, E-28006 Madrid, Spain -- [Kempley, R. S. -- Podolyak, Z. -- Regan, P. H. -- Walker, P. M.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England -- [Mitev, K. -- Rainovski, G.] Sofia Univ St Kliment Ohridski, Fac Phys, Sofia, Bulgaria -- [Ozben, C.] Istanbul Tech Univ, TR-80626 Istanbul, Turkey -- [Rudolph, D.] Lund Univ, Dept Phys, SE-22100 Lund, Sweden, Research Group: Information Management, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), informatique, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, CSNSM MECA, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), CSNSM INFOR, CSNSM ELEC, Matière Nucléaire, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), AGATA, Akkoyun, S., Algora, A., Alikhani, B., Ameil, F., De Angelis, G, Arnold, L., Astier, A., Ataç, A., Aubert, Y., Aufranc, C., Austin, A., Aydin, S., Azaiez, F., Badoer, S., Balabanski, D. L., Barrientos, D., Baulieu G., L, Baumann, R., Bazzacco, D., Beck, F. A., Beck, T., Bednarczyk, P., Bellato, M., Bentley, M. A., Benzoni, G., Berthier, R., Berti, L., Beunard, R., Lo Bianco, G., Birkenbach, B., Bizzeti, P. G., Bizzeti Sona, A. M., Le Blanc, F., Blasco, J. M., Blasi, N., Bloor, D., Boiano, C., Borsato, M., Bortolato, D., Boston, A. J., Boston, H. C., Bourgault, P., Boutachkov, P., Bouty, A., Bracco, A., Brambilla, S., Brawn, I. P., Brondi, Augusto, Broussard, S., Bruyneel, B., Bucurescu, D., Burrows, I., Bürger, A., Cabaret, S., Cahan, B., Calore, E., Camera, F., Capsoni, A., Carrió, F., Casati, G., Castoldi, M., Cederwall, B., Cercus J., L, Chambert, V., El Chambit, M., Chapman, R., Charles, L., Chavas, J., Clément, E., Cocconi, P., Coelli, S., Coleman Smith, P. J., Colombo, A., Colosimo, S., Commeaux, C., Conventi, D., Cooper, R. J., Corsi, A., Cortesi, A., Costa, L., Crespi, F. C. L., Cresswell, J. R., Cullen, D. M., Curien, D., Czermak, A., Delbourg, D., Depalo, R., Descombes, T., Désesquelles, P., Detistov, P., Diarra, C., Didierjean, F., Dimmock, M. R., Doan, Q. T., Domingo Pardo, C., Doncel, M., Dorangeville, F., Dosme, N., Drouen, Y., Duchêne, G., Dulny, B., Eberth, J., Edelbruck, P., Egea, J., Engert, T., Erduran, M. N., Ertürk, S., Fanin, C., Fantinel, S., Farnea, E., Faul, T., Filliger, M., Filmer, F., Finck, C., De France, G., Gadea, A., Gast, W., Geraci, A., Gerl, J., Gernhäuser, R., Giannatiempo, A., Giaz, A., Gibelin, L., Givechev, A., Goel, N., González, V., Gottardo, A., Grave, X., Grȩbosz, J., Griffiths, R., Grint, A. N., Gros, P., Guevara, L., Gulmini, M., Görgen, A., Ha, H. T. M., Habermann, T., Harkness, L. J., Harroch, H., Hauschild, K., He, C., Hernández Prieto, A., Hervieu, B., Hess, H., Hüyük, T., Ince, E., Isocrate, R., Jaworski, G., Johnson, A., Jolie, J., Jones, P., Jonson, B., Joshi, P., Judson, D. S., Jungclaus, A., Kaci, M., Karkour, N., Karolak, M., Kaşkaş, A., Kebbiri, M., Kempley, R. S., Khaplanov, A., Klupp, S., Kogimtzis, M., Kojouharov, I., Korichi, A., Korten, W., Kröll, T., Krücken, R., Kurz, N., Ky, B. Y., Labiche, M., Lafay, X., Lavergne, L., Lazarus, I. H., Leboutelier, S., Lefebvre, F., Legay, E., Legeard, L., Lelli, F., Lenzi, S. M., Leoni, S., Lermitage, A., Lersch, D., Leske, J., Letts, S. C., Lhenoret, S., Lieder, R. M., Linget, D., Ljungvall, J., Lopez Martens, A., Lotodé, A., Lunardi, S., Maj, A., Van Der Marel, J., Mariette, Y., Marginean, N., Marginean, R., Maron, G., Mather, A. R., Mȩczyński, W., Mendéz, V., Medina, P., Melon, B., Menegazzo, R., Mengoni, D., Merchan, E., Mihailescu, L., Michelagnoli, C., Mierzejewski, J., Milechina, L., Million, B., Mitev, K., Molini, P., Montanari, D., Moon, S., Morbiducci, F., Moro, RENATA EMILIA MARIA, Morrall, P. S., Möller, O., Nannini, A, Napoli, D. R., Nelson, L., Nespolo, M., Ngo, V. L., Nicoletto, M., Nicolini, R., Le Noa, Y., Nolan, P. J., Norman, M., Nyberg, J., Obertelli, A., Olariu, A., Orlandi, R., Oxley, D. C., Özben, C., Ozille, M., Oziol, C., Pachoud, E., Palacz, M., Palin, J., Pancin, J., Parisel, C., Pariset, P., Pascovici, G., Peghin, R., Pellegri, L., Perego, A., Perrier, S., Petcu, M., Petkov, P., Petrache, C., Pierre, E., Pietralla, N., Pietri, S., Pignanelli, M., Piqueras, I., Podolyak, Z., Le Pouhalec, P., Pouthas, J., Pugnére D., L, Pucknell, V. F. E., Pullia, A., Quintana, B., Raine, R., Rainovski, G., Ramina, L., Rampazzo, G., LA RANA, Giovanni, Rebeschini, M., Recchia, F., Redon N., L, Reese M., C, Reiter, P., Regan, P. H., Riboldi, S., Richer, M., Rigato, M., Rigby, S., Ripamonti, G., Robinson, A., Robin, J., Roccaz, J., Ropert, J. A., Rossé, B. l., Rossi Alvarez, C., Rosso, D., Rubio, B., Rudolph, D., Saillant, F., Şahin, E., Salomon, F., Salsac, M. D., Salt, J., Salvato, G., Sampson, J., Sanchis, E., Santos, C., Schaffner, H., Schlarb, M., Scraggs, D. P., Seddon, D., Şenyiǧit, M., Sigward, M. H., Simpson, G., Simpson, J., Slee, M., Smith, J. F., Sona, P., Sowicki, B., Spolaore, P., Stahl, C., Stanios, T., Stefanova, E., Stézowski, O., Strachan, J., Suliman, G., Söderström, P. A., Tain, J. L., Tanguy, S., Tashenov, S., Theisen, C. h., Thornhill, J., Tomasi, F., Toniolo, N., Touzery, R., Travers, B., Triossi, A., Tripon, M., Tun Lanoë, K. M. M., Turcato, M., Unsworth, C., Ur, C. A., Valiente Dobon, J. J., Vandone, V., Vardaci, Emanuele, Venturelli, R., Veronese, F., Veyssiere, C., Viscione, E., Wadsworth, R., Walker, P. M., Warr, N., Weber, C., Weisshaar, D., Wells, D., Wieland, O., Wiens A., U, Wittwer, G., Wollersheim, H. J., Zocca, F., Zamfir, N. V., Ziȩbliński, M., Zucchiatti, A., Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), and 0-Belirlenecek
Subjects: Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, Pulse-shape and gamma-ray tracking algorithms, FOS: Physical sciences, Semiconductor detector performance and simulations, Integrated circuit, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Tracking (particle physics), gamma-Ray tracking, 01 natural sciences, Pulse-shape and γ-ray tracking algorithms, law.invention, Data acquisition, law, 0103 physical sciences, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), 010306 general physics, γ-Ray spectroscopy, Nuclear Experiment, Instrumentation, Digital signal processing, Event reconstruction, gamma-Ray spectroscopy, Physics, sezele, Spectrometer, Spectrometers, 010308 nuclear & particles physics, business.industry, Detector, AGATA, Digital signals, HPGe detectors, Pulse-shape, Ray tracking, HPGe detectors, Algorithms, Crystals, Germanium, Semiconductor detectors, Signal processing, Spectrometry, Tracking (position), γ-Ray tracking, Instrumentation and Detectors (physics.ins-det), AGATA, Física nuclear, business, Computer hardware
Abstract: WOS: 000300864200005, The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer. (C) 2011 Elsevier B.V. All rights reserved., EU [RII3-CT-2004-506065]; German BMBF [06K-167, 06KY2051]; Swedish Research Council; Knut and Alice Wallenberg Foundation; UK EPSRC Engineering and Physical Sciences Research Council; UK STFC Science and Technology Facilities Council; AWE plc; Scientific and Technological Research Council of Turkey [106T055]; Ankara University [05B4240002]; Polish Ministry of Science and Higher Education [DPN/N190/AGATA/2009]; Spanish MICINN [FPA2008-06419, FPA2009-13377-C02-02]; Spanish Consolider-Ingenio Programme CPAN [CSD2007-00042]; Generalitat Valenciana [PROMETEO/2010/101]; MICINN, Spain; INFN, Italy [AIC10-D-000568]; Science and Technology Facilities Council [ST/F012039/1, ST/J000094/1, ST/F004192/1, ST/J000159/1, ST/I504940/1, NuSTAR, ST/F006950/1, ST/I504916/1, ST/G000670/1, ST/F004060/1, ST/J000051/1, ST/J000108/1, ST/G000670/1 NuSTAR, ST/I504959/1, ST/G000727/1, ST/F004052/1, ST/F004184/1], AGATA and this work is supported by the European funding bodies and the EU Contract RII3-CT-2004-506065, the German BMBF under Grants 06K-167 and 06KY2051, the Swedish Research Council and the Knut and Alice Wallenberg Foundation, UK EPSRC Engineering and Physical Sciences Research Council, UK STFC Science and Technology Facilities Council, AWE plc, Scientific and Technological Research Council of Turkey (Proj. nr. 106T055) and Ankara University (BAP Proj. nr. 05B4240002), the Polish Ministry of Science and Higher Education under Grant DPN/N190/AGATA/2009, the Spanish MICINN under grants FPA2008-06419 and FPA2009-13377-C02-02, the Spanish Consolider-Ingenio 2010 Programme CPAN (contract number CSD2007-00042) the Generalitat Valenciana under Grant PROMETEO/2010/101, and research performed in the frame of the GSI-IN2P3 collaboration agreement number 02-42. A. Gadea and E. Farnea acknowledge the support of MICINN, Spain, and INFN, Italy, through the AIC10-D-000568 bilateral action.
Published: 2012
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42. Multiple-highly deformed bands in the nucleus 134Nd

Author: G. de Angelis, C. Rossi-Alvarez, S. Lunardi, D. Bazzacco, C. A. Ur, D. Bucurescu, C. M. Petrache, and Ramon Wyss
Subjects: Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Excited state, medicine, Moment of inertia, Detector array, Atomic physics, Nucleus
Abstract: A high statistics experiment has been performed at the GASP detector array employing the 110 Pd + 28 Si reaction at 130 MeV to populate 134 Nd. Our findings do not confirm earlier data on the highly-deformed band of this nucleus. On the other hand, two new rotational sequences have been identified which show the characteristics of the intruder bands in the A = 130 mass region. This is one of the first results indicating the presence of excited highly-deformed bands in nuclei of this region. The behaviour of the dynamical moment of inertia of one of the bands is quite different from that of the highly-deformed bands previously known.
Published: 1994
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43. Erratum: Constraining theSfactor ofN15(p,γ)O16at astrophysical energies [Phys. Rev. C82, 055804 (2010)]

Author: C. Rossi Alvarez, Gianluca Imbriani, Edward Stech, Oscar Straniero, F. Käppeler, P. J. LeBlanc, R. E. Azuma, C. Rolfs, S. Falahat, H. Leiste, Frank Strieder, Filippo Terrasi, Richard deBoer, Vincenzo Roca, A. Palumbo, Gy. Gyürky, C. Mazzocchi, R. Menegazzo, Paolo Prati, Antonio Caciolli, E. Somorjai, M. Marta, Q. Li, Zs. Fülöp, Manoel Couder, Carlo Broggini, S. O'Brien, Antonios Kontos, A. Best, Mary Beard, Wanpeng Tan, G. Gervino, M. Junker, H. P. Trautvetter, H. Costantini, E. Uberseder, A. Lemut, Joachim Görres, C. Gustavino, Z. Elekes, B. Limata, R. Kuntz, A. Formicola, P. Corvisiero, A. Guglielmetti, Daniel Bemmerer, and Michael Wiescher
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Stable isotope ratio, S-factor, Gamma ray, 01 natural sciences, Isotopes of oxygen, Nuclear physics, 0103 physical sciences, 010303 astronomy & astrophysics, Radioactive decay, Oxygen-16
Published: 2011
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44. TheN14(p,γ)O15reaction studied with a composite germanium detector

Author: Vincenzo Roca, Alberto Vomiero, Gianluca Imbriani, Gyuri Gyürky, C. Gustavino, G. Gervino, Z. Elekes, Frank Strieder, P. Corvisiero, C. Rolfs, B. Limata, Oscar Straniero, H. Costantini, C. Rossi Alvarez, Filippo Terrasi, D. Bemmerer, E. Somorjai, R. Menegazzo, M. Marta, Zs. Fülöp, A. Formicola, H. P. Trautvetter, Paolo Prati, M. Junker, A. Lemut, C. Mazzocchi, Carlo Broggini, A. Caciolli, and A. Guglielmetti
Subjects: Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, CNO cycle, Branching fraction, Excited state, Gamma ray, Atomic physics, Nuclear Experiment, Ground state, Particle detector, Radioactive decay
Abstract: The rate of the carbon-nitrogen-oxygen (CNO) cycle of hydrogen burning is controlled by the {sup 14}N(p,{gamma}){sup 15}O reaction. The reaction proceeds by capture to the ground states and several excited states in {sup 15}O. In order to obtain a reliable extrapolation of the excitation curve to astrophysical energy, fits in the R-matrix framework are needed. In an energy range that sensitively tests such fits, new cross-section data are reported here for the four major transitions in the {sup 14}N(p,{gamma}){sup 15}O reaction. The experiment has been performed at the Laboratory for Underground Nuclear Astrophysics (LUNA) 400-kV accelerator placed deep underground in the Gran Sasso facility in Italy. Using a composite germanium detector, summing corrections have been considerably reduced with respect to previous studies. The cross sections for capture to the ground state and to the 5181, 6172, and 6792 keV excited states in {sup 15}O have been determined at 359, 380, and 399 keV beam energy. In addition, the branching ratios for the decay of the 278-keV resonance have been remeasured.
Published: 2011
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45. Spin, quadrupole moment, and deformation of the magnetic-rotational band head inPb193

Author: H. Hübel, M. Ionescu-Bujor, N. Marginean, D. Bucurescu, F. Brandolini, DL Balabanski, M. De Poli, C. Rossi Alvarez, S. Frauendorf, A. Iordachescu, Roberto Menegazzo, Georgi P. Georgiev, Katrien Vyvey, P. Pavan, Gerda Neyens, C. A. Ur, S. Chmel, D. Bazzacco, M. Danchev, and H. Haas
Subjects: Physics, Nuclear and High Energy Physics, Proton, Condensed matter physics, 010308 nuclear & particles physics, Parity (physics), 01 natural sciences, 0103 physical sciences, Quadrupole, Nuclear magnetic moment, Atomic physics, Deformation (engineering), 010306 general physics, Spin (physics), Excitation, Energy (signal processing)
Abstract: The spectroscopic quadrupole moment of the ${T}_{1/2}=9.4(5)$ ns isomer in $^{193}\mathrm{Pb}$ at an excitation energy ${E}_{\mathrm{ex}}=(2585+x)$ keV is measured by the time-differential perturbed angular distribution method as $|{Q}_{s}|=2.6(3)$ $e$ b. Spin and parity ${I}^{\ensuremath{\pi}}=27/{2}^{\ensuremath{-}}$ are assigned to it based on angular distribution measurements. This state is the band head of a magnetic-rotational band, described by the $1{i}_{13/2}$ subshell with the $(3{s}_{1/2}^{\ensuremath{-}2}1{h}_{9/2}1{i}_{13/2}){}_{{11}^{\ensuremath{-}}}$ proton excitation. The pairing-plus-quadrupole tilted-axis cranking calculations reproduce the measured quadrupole moment with a moderate oblate deformation ${\ensuremath{\epsilon}}_{2}=\ensuremath{-}0.11$, similar to that of the ${11}^{\ensuremath{-}}$proton intruder states, which nuclei in the region. This is the first direct measurement of a quadrupole moment and thus of the deformation of a magnetic-rotational band head.
Published: 2011
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46. Revision of the 15N(p, γ)16O reaction rate and oxygen abundance in H-burning zones

Author: Gianluca Imbriani, G. Gervino, A. Formicola, Zs. Fülöp, C. Rolfs, V. Capogrosso, Oscar Straniero, Filippo Terrasi, Alberto Vomiero, Antonio Caciolli, E. Somorjai, Gy. Gyürky, H. P. Trautvetter, Z. Elekes, A. Guglielmetti, Carlo Broggini, Frank Strieder, C. Gustavino, H. Costantini, Sara Palmerini, P. Corvisiero, C. Mazzocchi, M. Marta, Vincenzo Roca, Paolo Prati, M. Junker, A. Lemut, R. Menegazzo, C. Rossi Alvarez, Daniel Bemmerer, Caciolli, A., Mazzocchi, C., Capogrosso, V., Bemmere, D., Broggini, C., Corvisiero, P., Costantini, H., Elekes, Z., Formicola, A., Fülöp, Z., Gervino, G., Guglielmetti, A., Gustavino, C., Gyürky, G., Imbriani, Gianluca, Junker, M., Lemut, A., Marta, M., Menegazzo, R., Palmerini, S., Prati, P., Roca, Vincenzo, Rolfs, C., Rossi Alvarez, C, Somorjai, E., Straniero, O., Strieder, F., Terrasi, F., Trautvetter, H. P., and Vomiero, A.
Subjects: Cataclysmic variables, Novae, Nuclear reaction, abundances, Stars: AGB and post-AGB, Population, nuclear astrophysics, CNO Cycle, Astrophysics, 01 natural sciences, Reaction rate, Nucleosynthesis, 0103 physical sciences, Asymptotic giant branch, education, Novae, Nuclear Experiment, 010303 astronomy & astrophysics, Cataclysmic variables, Physics, education.field_of_study, abundances, 010308 nuclear & particles physics, Nuclear reactions, nucleosynthesis, abundances, Stars: AGB and post-AGB, Astronomy and Astrophysics, Space and Planetary Science, nucleosynthesis, Giant star, Red-giant branch, Stars, Astrophysics - Solar and Stellar Astrophysics, nucleosynthesi, 13. Climate action, Globular cluster, Nuclear reactions
Abstract: The NO cycle takes place in the deepest layer of a H-burning core or shell, when the temperature exceeds T {\simeq} 30 {\cdot} 106 K. The O depletion observed in some globular cluster giant stars, always associated with a Na enhancement, may be due to either a deep mixing during the RGB (red giant branch) phase of the star or to the pollution of the primordial gas by an early population of massive AGB (asymptotic giant branch) stars, whose chemical composition was modified by the hot bottom burning. In both cases, the NO cycle is responsible for the O depletion. The activation of this cycle depends on the rate of the 15N(p,{\gamma})16O reaction. A precise evaluation of this reaction rate at temperatures as low as experienced in H-burning zones in stellar interiors is mandatory to understand the observed O abundances. We present a new measurement of the 15N(p,{\gamma})16O reaction performed at LUNA covering for the first time the center of mass energy range 70-370 keV, which corresponds to stellar temperatures between 65 {\cdot} 106 K and 780 {\cdot}106 K. This range includes the 15N(p,{\gamma})16O Gamow-peak energy of explosive H-burning taking place in the external layer of a nova and the one of the hot bottom burning (HBB) nucleosynthesis occurring in massive AGB stars. With the present data, we are also able to confirm the result of the previous R-matrix extrapolation. In particular, in the temperature range of astrophysical interest, the new rate is about a factor of 2 smaller than reported in the widely adopted compilation of reaction rates (NACRE or CF88) and the uncertainty is now reduced down to the 10% level., Comment: 6 pages, 5 figures
Published: 2011

47. Transition probabilities in the X(5) candidateBa122

Author: O. Möller, A. M. Bizzeti-Sona, C. Fransen, A. Nannini, D. Bazzacco, C. M. Petrache, P. Sona, M. Fantuzi, Norbert Pietralla, P. Pavan, R. Menegazzo, N. Marginean, A. Gadea, D. R. Napoli, G. de Angelis, B. Melon, S. Lunardi, C. Michelagnoli, Dimitar Tonev, D. Mengoni, S. M. Lenzi, C. A. Ur, P. G. Bizzeti, A. Perego, A. Giannatiempo, P. Petkov, F. Della Vedova, E. Farnea, C. Rossi Alvarez, A. Dewald, R. Marginean, M. Nespolo, and A. Costin
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Crystallography, Recoil, Neutron emission, Yrast, Atomic physics, Energy (signal processing)
Abstract: To investigate the possible X(5) character of {sup 122}Ba, suggested by the ground-state band energy pattern, the lifetimes of the lowest yrast states of {sup 122}Ba have been measured, via the recoil distance Doppler-shift method. The relevant levels have been populated by using the {sup 108}Cd({sup 16}O,2n){sup 122}Ba and the {sup 112}Sn({sup 13}C,3n){sup 122}Ba reactions. The B(E2) values deduced in the present work are compared to the predictions of the X(5) model and to calculations performed in the framework of the IBA-1 and IBA-2 models.
Published: 2010
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48. New experimental study of low-energy (p,γ) resonances in magnesium isotopes

Author: Z. Elekes, Gianluca Imbriani, P. Corvisiero, H. P. Trautvetter, M. Marta, R. Menegazzo, A. DiLeva, A. Lemut, Daniel Bemmerer, Antonio Caciolli, E. Somorjai, M. Junker, C. Rolfs, Hans Werner Becker, C. Salvo, H. Costantini, Paolo Prati, C. Gustavino, C. Rossi Alvarez, A. Best, Vincenzo Roca, Oscar Straniero, Zs. Fülöp, Filippo Terrasi, A. Formicola, C. Mazzocchi, B. Limata, Frank Strieder, Carlo Broggini, A. Guglielmetti, Gyuri Gyürky, G. Gervino, and R. Bonetti
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Low energy, Absolute measurement, Proton, Underground laboratory, Resonance, Production (computer science), Atomic physics, Isotopes of magnesium, Omega
Abstract: Proton captures on Mg isotopes play an important role in the Mg-Al cycle active in stellar $H$-shell burning. In particular, the strengths of low-energy resonances with $El200$ keV in $^{25}\mathrm{Mg}$($p,\ensuremath{\gamma}$)$^{26}\mathrm{Al}$ determine the production of $^{26}\mathrm{Al}$ and a precise knowledge of these nuclear data is highly desirable. Absolute measurements at such low energies are often very difficult and hampered by $\ensuremath{\gamma}$-ray background as well as changing target stoichiometry during the measurements. The latter problem can be partly avoided using higher-energy resonances of the same reaction as a normalization reference. Hence the parameters of suitable resonances have to be studied with adequate precision. In the present work we report on new measurements of the resonance strengths $\ensuremath{\omega}\ensuremath{\gamma}$ of the $E=214$, $304$, and $326$ keV resonances in the reactions $^{24}\mathrm{Mg}$($p,\ensuremath{\gamma}$)$^{25}\mathrm{Al}$, $^{25}\mathrm{Mg}$($p,\ensuremath{\gamma}$)$^{26}\mathrm{Al}$, and $^{26}\mathrm{Mg}$($p,\ensuremath{\gamma}$)$^{27}\mathrm{Al}$, respectively. These studies were performed at the LUNA facility in the Gran Sasso underground laboratory using multiple experimental techniques and provided results with a higher accuracy than previously achieved.
Published: 2010
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49. Total natural radioactivity, Veneto (Italy)

Author: V. Strati, M. Baldoncini, G.P. Bezzon, C. Broggini, G.P. Buso, A. Caciolli, I. Callegari, L. Carmignani, T. Colonna, G. Fiorentini, E. Guastaldi, M. Kaçeli Xhixha, F. Mantovani, R. Menegazzo, L. Mou, C. Rossi Alvarez, G. Xhixha, A. Zanon, V. Strati, M. Baldoncini, G.P. Bezzon, C. Broggini, G.P. Buso, A. Caciolli, I. Callegari, L. Carmignani, T. Colonna, G. Fiorentini, E. Guastaldi, M. Kaçeli Xhixha, F. Mantovani, R. Menegazzo, L. Mou, C. Rossi Alvarez, G. Xhixha, and A. Zanon
Published: 2014
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50. Magnetic dipole sequences inRb83

Author: M. Hausmann, N. Marginean, Ronald Schwengner, D. R. Napoli, O. Yordanov, M. Axiotis, K. P. Lieb, G. Rainovski, G. de Angelis, Andreas Wagner, A. Jungclaus, C. Rossi Alvarez, F. Brandolini, F. Dönau, H. Schnare, and S. Frauendorf
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Isotope, Magnetic rotation, Excited state, SHELL model, Parity (physics), Nuclide, Atomic physics, Magnetic dipole, Beam (structure)
Abstract: High-spin states in {sup 83}Rb were populated in the reaction {sup 11}B+{sup 76}Ge at beam energies of 45 and 50 MeV. {gamma} rays were detected with the spectrometer GASP. The level scheme of {sup 83}Rb was extended up to 13.9 MeV. Mean lifetimes of 23 levels were determined using the Doppler-shift-attenuation method. Among the bands newly established is a sequence comprising intense M1 transitions and crossover E2 transitions. This sequence turns out to be irregular and thus shows that magnetic rotation as observed in the neighboring odd-odd isotopes is not realized in this odd-even nuclide. Excited states in {sup 83}Rb were interpreted in terms of the shell model using the model space {pi}(0f{sub 5/2},1p{sub 3/2},1p{sub 1/2},0g{sub 9/2}) {nu}(1p{sub 1/2},0g{sub 9/2}). The configurations predicted for the negative-parity M1 sequence reproduce the M1 transition strengths fairly well.
Published: 2009
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