162 results on '"Gadea, Andrés"'
Search Results
2. Quantitative description of neuronal calcium dynamics in C. elegans’ thermoreception
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Mobille, Zachary, Follmann, Rosangela, Vidal-Gadea, Andrés, and Rosa, Epaminondas, Jr.
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- 2023
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3. Methods for Modulating and Measuring Neuromuscular Exertion in C. elegans
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Hughes, Kiley J., primary and Vidal-Gadea, Andrés G., additional
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- 2022
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4. Low gas consumption fabrication of 3He solid targets for nuclear reactions
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Fernández, Asunción, Hufschmidt, Dirk, Colaux, Julien L., Valiente-Dobón, Jose Javier, Godinho, Vanda, Jiménez de Haro, Maria C., Feria, David, Gadea, Andrés, and Lucas, Stéphane
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- 2020
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5. Thermal acclimation and habitat-dependent differences in temperature robustness of a crustacean motor circuit
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Stein, Wolfgang, primary, Torres, Gabriela, additional, Giménez, Luis, additional, Espinosa-Novo, Noé, additional, Geißel, Jan Phillipp, additional, Vidal-Gadea, Andrés, additional, and Harzsch, Steffen, additional
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- 2023
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6. Thermal acclimation and habitat-dependent differences in temperature robustness of a crustacean motor circuit
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Stein, Wolfgang, Torres, Gabriela, Giménez, Luis, Espinosa-Novo, Noé, Geißel, Jan Phillipp, Vidal-Gadea, Andrés, Harzsch, Steffen, Stein, Wolfgang, Torres, Gabriela, Giménez, Luis, Espinosa-Novo, Noé, Geißel, Jan Phillipp, Vidal-Gadea, Andrés, and Harzsch, Steffen
- Abstract
Introduction: At the cellular level, acute temperature changes alter ionic conductances, ion channel kinetics, and the activity of entire neuronal circuits. This can result in severe consequences for neural function, animal behavior and survival. In poikilothermic animals, and particularly in aquatic species whose core temperature equals the surrounding water temperature, neurons experience rather rapid and wide-ranging temperature fluctuations. Recent work on pattern generating neural circuits in the crustacean stomatogastric nervous system have demonstrated that neuronal circuits can exhibit an intrinsic robustness to temperature fluctuations. However, considering the increased warming of the oceans and recurring heatwaves due to climate change, the question arises whether this intrinsic robustness can acclimate to changing environmental conditions, and whether it differs between species and ocean habitats. Methods: We address these questions using the pyloric pattern generating circuits in the stomatogastric nervous system of two crab species, Hemigrapsus sanguineus and Carcinus maenas that have seen a worldwide expansion in recent decades. Results and discussion: Consistent with their history as invasive species, we find that pyloric activity showed a broad temperature robustness (>30°C). Moreover, the temperature-robust range was dependent on habitat temperature in both species. Warm-acclimating animals shifted the critical temperature at which circuit activity breaks down to higher temperatures. This came at the cost of robustness against cold stimuli in H. sanguineus, but not in C. maenas. Comparing the temperature responses of C. maenas from a cold latitude (the North Sea) to those from a warm latitude (Spain) demonstrated that similar shifts in robustness occurred in natural environments. Our results thus demonstrate that neuronal temperature robustness correlates with, and responds to, environmental temperature conditions, potentially preparing animals for
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- 2023
7. Locomotion
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Gährs, Casey, primary and Vidal-Gadea, Andrés, additional
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- 2018
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8. Humidity sensation requires both mechanosensory and thermosensory pathways in Caenorhabditis elegans
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Russell, Joshua, Vidal-Gadea, Andrés G., Makay, Alex, Lanam, Carolyn, and Pierce-Shimomura, Jonathan T.
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- 2014
9. Conceptual design of the early implementation of the NEutron Detector Array (NEDA) with AGATA
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Hüyük, Tayfun, Di Nitto, Antonio, Jaworski, Grzegorz, Gadea, Andrés, Javier Valiente-Dobón, José, Nyberg, Johan, Palacz, Marcin, Söderström, Pär-Anders, Jose Aliaga-Varea, Ramon, de Angelis, Giacomo, Ataç, Ayşe, Collado, Javier, Domingo-Pardo, Cesar, Egea, Francisco Javier, Erduran, Nizamettin, Ertürk, Sefa, de France, Gilles, Gadea, Rafael, González, Vicente, Herrero-Bosch, Vicente, Kaşkaş, Ayşe, Modamio, Victor, Moszynski, Marek, Sanchis, Enrique, Triossi, Andrea, and Wadsworth, Robert
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- 2016
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10. Combining Old and New Tricks: The Study of Genes, Neurons, and Behavior in Crayfish
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Stein, Wolfgang, primary, DeMaegd, Margaret L., additional, Benson, Abigail M., additional, Roy, Rajit S., additional, and Vidal-Gadea, Andrés G., additional
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- 2022
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11. The dynamic range of voltage-dependent gap junction signaling is maintained by Ih-induced membrane potential depolarization
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Stein, Wolfgang, primary, DeMaegd, Margaret L., additional, Braun, Lena Yolanda, additional, Vidal-Gadea, Andrés G., additional, Harris, Allison L., additional, and Städele, Carola, additional
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- 2022
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12. Caenorhabditis elegans selects distinct crawling and swimming gaits via dopamine and serotonin
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Vidal-Gadea, Andrés, Topper, Stephen, Young, Layla, Crisp, Ashley, Kressin, Leah, Elbel, Erin, Maples, Thomas, Brauner, Martin, Erbguth, Karen, Axelrod, Abram, Gottschalk, Alexander, Siegel, Dionicio, and Pierce-Shimomura, Jonathan T.
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- 2011
13. The dynamic range of voltage-dependent gap junction signaling is maintained by Ih-induced membrane potential depolarization
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Stein, Wolfgang, primary, DeMaegd, Margaret L., additional, Braun, Lena Yolanda, additional, Vidal-Gadea, Andrés, additional, Harris, Allison L., additional, and Städele, Carola, additional
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- 2021
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14. Distinct mechanoreceptor pezo-1 isoforms modulate food intake in the nematode Caenorhabditis elegans
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Hughes, Kiley, primary, Shah, Ashka, additional, Bai, Xiaofei, additional, Adams, Jessica, additional, Bauer, Rosemary, additional, Jackson, Janelle, additional, Harris, Emily, additional, Ficca, Alyson, additional, Freebairn, Ploy, additional, Mohammed, Shawn, additional, Fernández, Eliana M, additional, Bainbridge, Chance, additional, Brocco, Marcela, additional, Stein, Wolfgang, additional, and Vidal-Gadea, Andrés G, additional
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- 2021
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15. Neuronal membrane glycoprotein (nmgp‐1) gene deficiency affects chemosensation‐related behaviors, dauer exit and egg‐laying in Caenorhabditis elegans
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Fernández, Eliana M., primary, Cutraro, Yamila B., additional, Adams, Jessica, additional, Monteleone, Melisa C., additional, Hughes, Kiley, additional, Frasch, Alberto C., additional, Vidal‐Gadea, Andrés, additional, and Brocco, Marcela A., additional
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- 2021
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16. Reinterpretation of excited states in Po 212: Shell-model multiplets rather than α -cluster states
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Fernández, A., Jungclaus, Andrea, Golubev, P., Rudolph, D., Sarmiento, L. G., Gargano, A., Naïdja, H., Astier, A., Dupont, E., Gadea, Andrés, Nácher, Enrique, Perea, Ángel, Wimmer, K., Clément, E., Fremont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H. J., Ljungvall, J., Ménager, L., Pérez-Vidal, R.M., Petrache, C. M., Ralet, D., Ropert, J. A., Saillant, F., Såmark-Roth, A., Simpson, G. S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lalović, N., Lorenz, Ch, Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Bracco, A., Ciemala, M., Collado, J., Cullen, D.M., Domingo Pardo, César, Eberth, J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D.R., Nyberg, J., Podolyak, Zs, Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, Ch, Valiente-Dobón, J. J., European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Generalitat Valenciana, Swedish Research Council, and Federal Ministry of Education and Research (Germany)
- Abstract
19 pags., 14 figs., 3 tabs., A γ-ray spectroscopic study of Po212 was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction C12(Pb208,Po212)Be8 and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1- and 2- and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of Po212 with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4-), 1751 (8-), 1787 (6-), 1946 (4-), 1986 (8-), and 2016 (6-) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of Po212 is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 61+ yrast state, and exclusive reaction cross sections., This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 654002 and FEDER funds. We furthermore acknowledge support from the Spanish Ministerio de Ciencia, Inovación y Universidades under contracts FPA2014-57196-C5, FPA2017-84756-C4, and SEV-2014-0398, the Generalitat Valenciana under Grant No. PROMETEO/2019/005, the Swedish Research Council (Vetenskapsrådet, VR 2016-3969), and the German BMBF under Contracts No. 05P18PKFN9 and No. 05P19PKFNA.
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- 2021
17. Evidence for enhanced neutron-proton correlations from the level structure of the N=Z+1 nucleus Tc44 4387
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Liu, X., Cederwall, B., Qi, C., Wyss, R. A., Aktas, Ó, Ertoprak, A., Zhang, W., Clément, E., De France, G., Ralet, D., Gadea, Andrés, Goasduff, A., Jaworski, G., Kuti, I., Nyakó, B. M., Nyberg, J., Palacz, M., Wadsworth, R., Valiente-Dobón, J. J., Al-Azri, H., Ataç Nyberg, A., Bäck, T., De Angelis, G., Doncel, M., Dudouet, J., Gottardo, A., Jurado, M., Ljungvall, J., Mengoni, D., Napoli, D.R., Petrache, C. M., Sohler, D., Timár, J., Barrientos, D., Bednarczyk, P., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Burrows, I., Charles, L., Ciemala, M., Crespi, F.C.L., Cullen, D.M., Désesquelles, P., Domingo Pardo, César, Eberth, J., Erduran, N., Ertürk, S., González, V., Goupil, J., Hess, H., Hüyük, T., Jungclaus, Andrea, Korten, W., Lemasson, A., Leoni, S., Maj, A., Menegazzo, R., Million, B., Perez-Vidal, R. M., Podolyàk, Zs, Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Simpson, J., Stezowski, O., Theisen, C., Zielińska, M., Swedish Research Council, European Commission, Science and Technology Facilities Council (UK), National Science Centre (Poland), National Research, Development and Innovation Office (Hungary), Agencia Estatal de Investigación (España), Generalitat Valenciana, and China Scholarship Council
- Abstract
5 pags., 4 figs., The low-lying excited states in the neutron-deficient N=Z+1 nucleus Tc444387 have been studied via the fusion-evaporation reaction Fe54(Ar36, 2n1p)Tc87 at the Grand Accélérateur National d'Ions Lourds (GANIL), France. The AGATA spectrometer was used in conjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arrays to measure coincident prompt γ rays, neutrons, and charged particles emitted in the reaction. A level scheme of Tc87 from the (9/2g.s.+) state to the (33/21+) state was established based on six mutually coincident γ-ray transitions. The constructed level structure exhibits a rotational behavior with a sharp backbending at ω≈0.50 MeV. A decrease in alignment frequency and increase in alignment sharpness in the odd-mass isotonic chains around N=44 is proposed as an effect of the enhanced isoscalar neutron-proton interactions in odd-mass nuclei when approaching the N=Z line., This work was supported by the Swedish Research Council under Grants No. 621-2014-5558 and No. 2019-04880, the EU 7th Framework Programme, Integrating Activities Transnational Access, Project No. 262010 ENSAR, the UK STFC under Grants No. ST/L005727/1 and No. ST/P003885/1, the Polish National Science Centre, Grants No. 2017/25/B/ST2/01569, No. COPIN-INFN, No. COPIN-IN2P3, and No. COPIGAL projects, the National Research, Development and Innovation Fund of Hungary (Project No. K128947), the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034), the Hungarian National Research, Development and Innovation Office - NKFIH, Contract No. PD124717, the Ministerio de Ciencia e Innovación and Generalitat Valenciana, Spanish, under Grants No. SEV-2014-0398, No. FPA2017-84756-C4, and No. PROMETEO/2019/005 and by the EU FEDER funds. X.L. gratefully acknowledges support from the China Scholarship Council, Grant No. 201700260183 for his stay in Sweden.
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- 2021
18. Physiologists turned Geneticists: Identifying transcripts and genes for neuronal function in the Marbled Crayfish, Procambarus virginalis
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Stein, Wolfgang, Talasu, Saisupritha, Vidal-Gadea, Andrés, and DeMaegd, Margaret L.
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education ,Article - Abstract
The number of undergraduate researchers interested in pursuing neurophysiological research exceeds the research laboratory positions and hands-on course experiences available because these types of experiments often require extensive experience or expensive equipment. In contrast, genetic and molecular tools can more easily incorporate undergraduates with less time or training. With the explosion of newly sequenced genomes and transcriptomes, there is a large pool of untapped molecular and genetic information which would greatly inform neurophysiological processes. Classically trained neurophysiologists often struggle to make use of newly available genetic information for themselves and their trainees, despite the clear advantage of combining genetic and physiological techniques. This is particularly prevalent among researchers working with organisms that historically had no or only few genetic tools available. Combining these two fields will expose undergraduates to a greater variety of research approaches, concepts, and hands-on experiences. The goal of this manuscript is to provide an easily understandable and reproducible workflow that can be applied in both lab and classroom settings to identify genes involved in neuronal function. We outline clear learning objectives that can be acquired by following our workflow and assessed by peer-evaluation. Using our workflow, we identify and validate the sequence of two new Gamma Aminobutyric Acid A (GABAA) receptor subunit homologs in the recently published genome and transcriptome of the marbled crayfish, Procambarus virginalis. Altogether, this allows undergraduate students to apply their knowledge of the processes of gene expression to functional neuronal outcomes. It also provides them with opportunities to contribute significantly to physiological research, thereby exposing them to interdisciplinary approaches.
- Published
- 2020
19. Lifetimes of core-excited states in semi-magic 95Rh
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Ertoprak, A., Algora, Alejandro, Gadea, Andrés, Huyuk, Tayfun, Ministerio de Ciencia, Innovación y Universidades (España), and Generalitat Valenciana
- Abstract
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus Rh. The fusion-evaporation reaction Ni(Ca, 3 p) was used to populate high-spin states in Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.
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- 2020
20. Isospin Properties of Nuclear Pair Correlations from the Level Structure of the Self-Conjugate Nucleus Ru 88
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Cederwall, B., Gadea, Andrés, Jurado, M., Domingo Pardo, César, Huyuk, Tayfun, Perez Vidal, R.M., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)
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Nuclear Theory ,Nuclear Experiment - Abstract
The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N=Z) nuclide Ru448844 has been measured using the combination of the Advanced Gamma Tracking Array (AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT charged particle detector array. Excited states in Ru88 were populated via the Fe54(Ar36,2nγ)Ru88∗ fusion-evaporation reaction at the Grand Accélérateur National d'Ions Lourds (GANIL) accelerator complex. The observed γ-ray cascade is assigned to Ru88 using clean prompt γ-γ-2-neutron coincidences in anticoincidence with the detection of charged particles, confirming and extending the previously assigned sequence of low-lying excited states. It is consistent with a moderately deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring N>Z nuclides. The direct observation of such a "delayed" rotational alignment in a deformed N=Z nucleus is in agreement with theoretical predictions related to the presence of strong isoscalar neutron-proton pair correlations.
- Published
- 2020
21. Physics opportunities with the Advanced Gamma Tracking Array: AGATA
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Korten, W., Gadea, Andrés, and Ministerio de Ciencia, Innovación y Universidades (España)
- Abstract
AGATA Collaboration New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams. The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).
- Published
- 2020
22. Lifetimes of core-excited states in semi-magic 95Rh
- Author
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Ministerio de Ciencia, Innovación y Universidades (España), Generalitat Valenciana, Ertoprak, A., Algora, Alejandro, Gadea, Andrés, Huyuk, Tayfun, Ministerio de Ciencia, Innovación y Universidades (España), Generalitat Valenciana, Ertoprak, A., Algora, Alejandro, Gadea, Andrés, and Huyuk, Tayfun
- Abstract
Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus Rh. The fusion-evaporation reaction Ni(Ca, 3 p) was used to populate high-spin states in Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations.
- Published
- 2020
23. Contributions to Phase Two of AGATA electronics
- Author
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Gadea, Andrés, Collado Ruiz, Javier Primitivo, Gadea, Andrés, and Collado Ruiz, Javier Primitivo
- Abstract
In the field of Nuclear Physics, high-resolution gamma ray spectroscopy is an accurate method to perform nuclear structure studies, retrieving the energy and angular distributions from gamma photons emitted in the transition between nuclear states. In order to obtain the nucleus in an excited state, such that will emit gamma-rays, we are forced to collide matter, doing nuclear reactions (in the in-beam spectroscopy) or resort to the radioactive decay (decay spectroscopy). The High Purity Germanium (HPGe) semiconductor detectors have shown to provide good response as gamma-ray detector. As other semiconductor detectors, HPGe produce, with high sensitiveness, a current proportional to gamma ray energies while there are subject to high voltage inverse polarization, in cryogenic conditions. The AGATA (Advanced GAmma Tracking Array) HPGe detector array is a state-ofthe-art detector array for the gamma ray spectroscopy technique in nuclear physics. In order to improve the sensitivity, AGATA HPGe detectors have the outer contact divided in 36 segments in order to determine photon position and energy deposited in each segment. With the interaction energy and position information is possible to reconstruct (Track) the gamma-ray interaction sequence using tracking algorithms. With such technique is possible to maximize the sensitivity of the detector array (energy resolution and P/T) without using part of the detection solid angle for the anti-Compton active shields. In addition to the segmented detectors, the positions sensitive HPGe arrays require sampling electronics with spectroscopic signal-to-noise ratios, which provides the traces to be processed by the Pulse Shape Analysis algorithms. To provide maximum efficiency and sensitivity, the AGATA project aims to construct a 4¿ solid angle detector array. This geometry optimizes as well the information obtained, something that is especially important in experiments using expensiv ...
- Published
- 2020
24. Affordable Caenorhabditis elegans tracking system for classroom use
- Author
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Leonard, Nicholas, primary and Vidal-Gadea, Andrés G., additional
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- 2021
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25. The dynamic range of voltage-dependent gap junction signaling is maintained by Ih-induced membrane potential depolarization.
- Author
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Stein, Wolfgang, DeMaegd, Margaret L., Braun, Lena Yolanda, Vidal-Gadea, Andrés G, Harris, Allison L., and Städele, Carola
- Subjects
MEMBRANE potential ,POSTSYNAPTIC potential ,MOTOR neurons ,SYNAPSES ,GANGLIA ,NEURAL transmission ,NEURONS - Abstract
Like their chemical counterparts, electrical synapses show complex dynamics such as rectification and voltage dependence that interact with other electrical processes in neurons. The consequences arising from these interactions for the electrical behavior of the synapse, and the dynamics they create, remain largely unexplored. Using a voltage-dependent electrical synapse between a descending modulatory projection neuron (MCN1) and a motor neuron (LG) in the crustacean stomatogastric ganglion, we find that the influence of the hyperpolarization-activated inward current (I
h ) is critical to the function of the electrical synapse. When we blocked Ih with CsCl, the apparent voltage dependence of the electrical synapse shifted by 18.7 mV to more hyperpolarized voltages, placing the dynamic range of the electrical synapse outside of the range of voltages used by the LG motor neuron (-60.2 mV to -44.9 mV). With dual electrode current- and voltage-clamp recordings, we demonstrate that this voltage shift is not due to a change in the properties of the gap junction itself, but is a result of a sustained effect of Ih on the presynaptic MCN1 axon terminal membrane potential. Ih -induced depolarization of the axon terminal membrane potential increased the electrical postsynaptic potentials and currents. With Ih present, the axon terminal resting membrane potential is depolarized, shifting the dynamic range of the electrical synapse toward the functional range of the motor neuron. We thus demonstrate that the function of an electrical synapse is critically influenced by a voltage-dependent ionic current (Ih ). [ABSTRACT FROM AUTHOR]- Published
- 2022
- Full Text
- View/download PDF
26. Coordination of behavioral hierarchies during environmental transitions in Caenorhabditis elegans
- Author
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Vidal-Gadea, Andrés G., Davis, Scott, Becker, Lindsay, and Pierce-Shimomura, Jonathan T.
- Published
- 2012
27. Neuronal membrane glycoprotein (nmgp‐1) gene deficiency affects chemosensation‐related behaviors, dauer exit and egg‐laying in Caenorhabditis elegans.
- Author
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Fernández, Eliana M., Cutraro, Yamila B., Adams, Jessica, Monteleone, Melisa C., Hughes, Kiley J., Frasch, Alberto C., Vidal‐Gadea, Andrés G., and Brocco, Marcela A.
- Subjects
CAENORHABDITIS elegans ,NERVOUS system ,SENSORY neurons ,PSYCHOLOGICAL stress ,GENES - Abstract
The nervous system monitors the environment to maintain homeostasis, which can be affected by stressful conditions. Using mammalian models of chronic stress, we previously observed altered brain levels of GPM6A, a protein involved in neuronal morphology. However, GPM6A's role in systemic stress responses remains unresolved. The nematode Caenorhabditis elegans expresses a GPM6A ortholog, the neuronal membrane glycoprotein 1 (NMGP‐1). Because of the shared features between nematode and mammalian nervous systems and the vast genetic tools available in C. elegans, we used the worm to elucidate the role of GPM6A in the stress response. We first identified nmgp‐1 expression in different amphid and phasmid neurons. To understand the nmgp‐1 role, we characterized the behavior of nmgp‐1(RNAi) animals and two nmgp‐1 mutant alleles. Compared to control animals, mutant and RNAi‐treated worms exhibited increased recovery time from the stress‐resistant dauer stage, altered SDS chemosensation and reduced egg‐laying rate resulting in egg retention (bag‐of‐worms phenotype). Silencing of nmgp‐1 expression induced morphological abnormalities in the ASJ sensory neurons, partly responsible for dauer exit. These results indicate that nmgp‐1 is required for neuronal morphology and for behaviors associated with chemosensation. Finally, we propose nmgp‐1 mutants as a tool to screen drugs for human nervous system pathologies. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
28. Lifetime measurements in Ti 52,54 to study shell evolution toward N=32
- Author
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Goldkuhle, A., Fransen, C., Blazhev, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dewald, A., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.H., Lemasson, A., Lenzi, Silvia M., Li, H.J., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B.S., Pérez-Vidal, R.M., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K.O., Ataç, A., Barrientos, D., Barthe-Dejean, C., Benzoni, G., Boston, A.J., Boston, H.C., Bourgault, P., Burrows, I., Cacitti, J., Cederwall, B., Ciemala, M., Cullen, D.M., De France, G., Domingo Pardo, César, Foucher, J.L., Fremont, G., Gadea, Andrés, Gangnant, P., González, V., Goupil, J., Henrich, C., Houarner, C., Sanchis, E., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)
- Subjects
Nuclear Experiment - Abstract
AGATA Collaboration, Lifetimes of the excited states in the neutron-rich Ti52,54 nuclei, produced in a multinucleon-transfer reaction, were measured by employing the Cologne plunger device and the recoil-distance Doppler-shift method. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility by using the Advanced Gamma Tracking Array for the γ-ray detection, coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification. A comparison between the transition probabilities obtained from the measured lifetimes of the 21+ to 81+ yrast states in Ti52,54 and that from the shell-model calculations based on the well-established GXPF1A, GXPF1B, and KB3G fp shell interactions support the N=32 subshell closure. The B(E2) values for Ti52 determined in this work are in disagreement with the known data, but are consistent with the predictions of the shell-model calculations and reduce the previously observed pronounced staggering across the even-even titanium isotopes.
- Published
- 2019
29. Excitations of the magic N=50 neutron-core revealed in Ga 81
- Author
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Dudouet, J., Lemasson, A., Maquart, G., Nowacki, F., Verney, D., Rejmund, M., Duchêne, G., Stezowski, O., Clément, E., Michelagnoli, C., Korichi, A., Andreoiu, C., Astier, A., De Angelis, G., De France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombrádi, Zs., Ducoin, C., Gadea, Andrés, Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Le Blanc, F., Lenzi, Silvia M., Li, G., Lozeva, R., Million, B., Napoli, D.R., Navin, A., Pérez-Vidal, R. M., Petrache, C.M., Ralet, D., Ramdhane, M., Redon, N., Schmitt, C., Sohler, D., Ministerio de Economía y Competitividad (España), and Ministerio de Ciencia, Innovación y Universidades (España)
- Subjects
Astrophysics::High Energy Astrophysical Phenomena ,Nuclear Theory ,Physics::Atomic and Molecular Clusters ,Nuclear Experiment - Abstract
The high-spin states of the neutron-rich Ga81, with three valence protons outside a Ni78 core, were measured. The measurement involved prompt γ-ray spectroscopy of fission fragments isotopically identified using the combination of the variable mode spectrometer (VAMOS++) and the advanced gamma tracking array (AGATA). The new γ-ray transitions, observed in coincidence with Ga81 ions, and the corresponding level scheme do not confirm the high-spin levels reported earlier. The newly observed high-spin states in Ga81 are interpreted using the results of state-of-the-art large-scale shell model (LSSM) calculations. The lower excitation energy levels are understood as resulting from the recoupling of three valence protons to the closed doubly magic core, while the highest excitation energy levels correspond to excitations of the magic N=50 neutron core. These results support the doubly magic character of Ni78 and the persistence of the N=50 shell closure but also highlight the presence of strong proton-neutron correlations associated with the promotion of neutrons across the magic N=50 shell gap, only few nucleons away from Ni78.
- Published
- 2019
30. New spectroscopic information on Tl 211,213: A changing structure beyond the N=126 shell closure
- Author
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Gottardo, A., Valiente-Dobón, J. J., Benzoni, G., Morales, Ana Isabel, Gadea, Andrés, Lunardi, S., Boutachkov, P., Bruce, A.M., Górska, M., Grebosz, J., Pietri, S., Podolyák, Z., Pfützner, M., Regan, P. H., Rudolph, D., Weick, H., Alcántara Núñez, J., Algora, Alejandro, Al-Dahan, N., De Angelis, G., Ayyad, Y., Alkhomashi, N., Allegro, P. R. P., Bazzacco, D., Benlliure, J., Bowry, M., Bracco, A., Bunce, M., Camera, F., Casarejos, E., Cortés, M.L., Crespi, F.C.L., Corsi, A., Denis Bacelar, A. M., Deo, A. Y., Domingo Pardo, César, Doncel, M., Dombrádi, Zs., Engert, T., Eppinger, K., Farrelly, G. F., Farinon, F., Geissel, H., Gerl, J., Goel, N., Gregor, E., Habermann, T., Hoischen, R., Janik, R., and Generalitat Valenciana
- Subjects
Nuclear Theory ,Physics::Atomic and Molecular Clusters ,Nuclear Experiment - Abstract
The neutron-rich isotopes Tl211,213, beyond the N=126 shell closure, have been studied for the first time in isomer γ-ray decay, exploiting the fragmentation of a primary uranium beam at the Fragment Separator-Rare Isotopes Investigation at GSI setup. The observed isomeric states in Tl211,213 show a deviation from the seniority-like scheme of Tl209. The possible interpretation of the data is discussed on the basis of energy-level systematics and shell-model calculations.
- Published
- 2019
31. Identification of high-spin proton configurations in Ba 136 and Ba 137
- Author
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Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Gargano, A., Coraggio, L., Itaco, N., Blazhev, A., Arnswald, K., Bazzacco, D., Birkenbach, B., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hetzenegger, R., Hirsch, R., John, P.R., Jolie, J., Jungclaus, Andrea, Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovi¿, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Z., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Sahin, E., Saitama University, Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Bonn-Cologne Graduate School of Physics and Astronomy, and Generalitat Valenciana
- Abstract
19 pags., 11 figs., 3 tabs., The high-spin structures of Ba136 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Ba136 is populated in a Xe136+U238 MNT reaction employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and in two Be9+Te130 fusion-evaporation reactions using the High-efficiency Observatory for γ-Ray Unique Spectroscopy (HORUS) at the FN tandem accelerator of the University of Cologne, Germany. Furthermore, both isotopes are populated in an elusive reaction channel in the B11+Te130 fusion-evaporation reaction utilizing the HORUS γ-ray array. The level scheme above the Jπ=10+ isomer in Ba136 is revised and extended up to an excitation energy of approximately 5.5 MeV. From the results of angular-correlation measurements, the Ex=3707- and Ex=4920-keV states are identified as the bandheads of positive- and negative-parity cascades. While the high-spin regimes of both Te132 and Xe134 are characterized by high-energy 12+→10+ transitions, the Ba136E2 ground-state band is interrupted by negative-parity states only a few hundred keV above the Jπ=10+ isomer. Furthermore, spins are established for several hitherto unassigned high-spin states in Ba137. The new results close a gap along the high-spin structure of N, Furthermore, we express our thanks to Dr. E. Teruya and Dr. N. Yoshinaga from Saitama University, Japan, for providing the results of their shellmodel calculation with the PQM130 interaction. The research leading to these results has received funding from the German BMBF under Contracts No. 05P15PKFN9 TP1 and No. 05P18PKFN9 TP1, from the European Union Seventh Framework Programme FP7/2007-2013 under Grant Agreement No. 262010 - ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854- C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5, and from the UK Science and Technology Facilities Council (STFC). L.K. and A.V. thank the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) for financial support. One of the authors (A. Gadea) has been supported by the Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019, and EU under the FEDER program.
- Published
- 2019
32. Test of a 3He target for transfer reactions in inverse kinematics
- Author
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Carozzi, G., Valiente-Dobón, J. J., Gadea, Andrés, Siciliano, M., Mengoni, D., Fernández-Camacho, A., Godinho, V., Hufschmidt, Dirk, Di Nitto, A., Carozzi, G., Valiente-Dobon, J. J., Gadea, A., Siciliano, M., Mengoni, D., Fernandez, A., Godinho, V., Hufschmidt, D., and Di Nitto, A.
- Abstract
With the aim of studying exotic nuclei close to the proton dripline, an innovative 3He target was produced and tested in a collaboration between the Materials Science Institute of Seville (Spain) and the Legnaro National Laboratories (Italy). The target was manufactured with a new technique that aims to reduce the costs while providing high quality targets. The target was tested at the Legnaro National Laboratories. The results of this test are presented in this contribution.
- Published
- 2019
33. Isomer spectroscopy in Ba-133 and high-spin structure of Ba-134
- Author
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Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H.-K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, Andrea, Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., Zell, K. O., Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), and Generalitat Valenciana
- Abstract
18 pags., 11 figs., 4 tabs., The transitional nuclei Ba-134 and Ba-133 are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The J(pi) = 19/2(+) state at 1942 keV in Ba-133 is identified as an isomer with a half-life of 66.6(20) ns corresponding to a B(E1) value of 7.7(4) x 10(-6) e(2) fm(2) for the J(pi) = 19/2(+) to J(pi) = 19/2(-) transition. The level scheme of Ba-134 above the J(pi) = 10(+) isomer is extended to approximately 6 MeV. A pronounced backbending is observed at h omega = 0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z = 56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional Ba-134., The research leading to these results has received funding from the German BMBF under Contracts No. 05P15PKFN9 TP1 and No. 05P18PKFN9 TP1, from the European Union Seventh Framework Programme FP7/2007-2013 under Grant No. 262010-ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014- 57196-C5, and from the U.K. Science and Technology Facilities Council (STFC). One of the authors (A. Gadea) has been supported by the Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019 and EU under the FEDER program.
- Published
- 2019
34. Collectivity along N=50: Nuclear structure studies on the neutron-magic nuclei 92Mo and 94Ru with AGATA and VAMOS++
- Author
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Gadea, Andrés, Domingo Pardo, César, Perez Vidal, R.M., Gadea, Andrés, Domingo Pardo, César, and Perez Vidal, R.M.
- Abstract
El trabajo desarrollado en esta Tesis se centra en estudio experimental del comportamiento colectivo de los estados excitados de los núcleos semimágicos con N=50 en función de la ocupación del orbital g9/2 de protones, a través de la medida de la vida media de los estados "yrast" 4+ de los núcleos 92Mo y 94Ru. En particular, se ha investigado la conservación de "seniority" a lo largo de la capa g9/2 que es la primera capa donde podría no conservarse.
- Published
- 2019
35. Isomer spectroscopy in Ba-133 and high-spin structure of Ba-134
- Author
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Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Generalitat Valenciana, Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H. K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, Andrea, Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., Zell, K. O., Federal Ministry of Education and Research (Germany), European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Generalitat Valenciana, Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H. K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, Andrés, Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, Andrea, Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., and Zell, K. O.
- Abstract
The transitional nuclei Ba-134 and Ba-133 are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The J(pi) = 19/2(+) state at 1942 keV in Ba-133 is identified as an isomer with a half-life of 66.6(20) ns corresponding to a B(E1) value of 7.7(4) x 10(-6) e(2) fm(2) for the J(pi) = 19/2(+) to J(pi) = 19/2(-) transition. The level scheme of Ba-134 above the J(pi) = 10(+) isomer is extended to approximately 6 MeV. A pronounced backbending is observed at h omega = 0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z = 56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional Ba-134.
- Published
- 2019
36. Quadrupole collectivity in 42Ca from low-energy Coulomb excitation with AGATA
- Author
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Hadynska-Klek, Katarzyna, Napiorkowski, Paweł Jan, Zielinska, Magdalena, Srebrny, Julian, Maj, Adam, Azaiez, Faisal, Valiente-Dobón, Jose Javier, Kicinska-Habior, M, Nowacki, Frédéric, Naïdja, Houda, Bounthong, B, Rodriguez, T.R., De Angelis, G., Abraham, T., Anil Kumar, G, Bazzacco, Dino, Bellato, Marco, Bortolato, D., Bednarczyk, P., Benzoni, Giovanna, Berti, L, Birkenbach, Benedikt, Bruyneel, B., Brambilla, S., Camera, Franco, Chavas, J, Cederwall, B., Charles, L., Ciemala, M., Cocconi, P, Coleman-Smith, P, Colombo, A, Corsi, A., Crespi, F.C.L., Cullen, Dave M., Czermak, A, Désesquelles, Pierre, Doherty, Daniel T., Dulny, B, Eberth, Jürgen, Farnea, Enrico, Fornal, B., Franchoo, Serge, Gadea, Andrés, Giaz, Agnese, Gottardo, Andrea, Grave, X, Grebosz, J., Görgen, Andreas, Gulmini, M, Habermann, T, Hess, Herbert, Isocrate, R., Iwanicki, J., Jaworski, G, Judson, DS, Jungclaus, Andrea, Karkour, N., Kmiecik, M., Karpinski, D, Kisielinski, M, Kondratyev, N, Korichi, Amel, Komorowska, M, Kowalczyk, M., Korten, Wolfram, Krzysiek, M, Lehaut, G, Leoni, Silvia, Ljungvall, Joa, Lopez-Martens, Araceli, Lunardi, Santo, Maron, G., Mazurek, K., Menegazzo, Roberto, Mengoni, Daniele, Merchan, E., Meczynski, W., Michelagnoli, Caterina, Milion, B, Myalski, S., Napoli, D.R., Niikura, Megumi, Obertelli, Alexandre, Ozmen, SF, Palacz, M, Prochniak, L., Pullia, A., Quintana, B., Rampazzo, G, Recchia, F., Redon, N, Reiter, Peter, Rosso, D., Rusek, K, Sahin, Eda, Salsac, Marie Delphine, Söderström, Pär Anders, Stefan, I., Stezowski, Olivier, Styczen, J, Theisen, Christophe, Toniolo, N, Ur, Cǎlin A., Wadsworth, R, Wasilewska, B., Wiens, Andreas, Wood, J.L., Wrzosek-Lipska, Katarzyna, and Ziblinski, M.
- Abstract
A Coulomb-excitation experiment to study electromagnetic properties of 42Ca was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. γ rays from excited states in 42Ca were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2 matrix elements coupling six low-lying states in 42Ca, including the diagonal E2 matrix elements of 2+ 1 and 2+ 2 states, were determined using the least-squares code GOSIA. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 0+ 1,2 and 2+ 1,2 states, as well as triaxiality for 0+ 1,2 states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in 42Ca. The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in 42Ca.
- Published
- 2018
37. High-spin structures in Xe 132 and Xe 133 and evidence for isomers along the N=79 isotones
- Author
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Vogt, A., Siciliano, M., Birkenbach, B., Reiter, P., Gadea, Andrés, Gelletly, W., Giaz, A., Görgen, A., Jungclaus, Andrea, MacChiavelli, A. O., Japan Society for the Promotion of Science, Bonn-Cologne Graduate School of Physics and Astronomy, Generalitat Valenciana, National Science Foundation (US), Science and Technology Facilities Council (UK), Ministerio de Ciencia e Innovación (España), European Commission, Federal Ministry of Education and Research (Germany), and Ministerio de Economía y Competitividad (España)
- Abstract
A. Vogt et al. -- 14 pags., 10 figs., The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features., The research leading to these results has received funding from the German BMBF under Contract No. 05P12PKFNE TP4, from the European Union Seventh Framework Programme FP7/2007- 2013 under Grant Agreement No. 262010 - ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014- 57196-C5, from the UK Science and Technology Facilities Council (STFC), and from the US National Science Foundation (NSF). E.T. and N.Y. were supported by a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Fellows (Grant No. 26.10429). A.V. and L.K. thank the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) for financial support. One of the authors (A. Gadea) has been supported by the GeneralitatValenciana, Spain, under the grant PROMETEOII/2014/019 and by the EU under the FEDER program.
- Published
- 2017
38. Isomers and high-spin structures in the N=81 isotones Xe 135 and Ba 137
- Author
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Vogt, A., Birkenbach, B., Reiter, P., Blazhev, A., Siciliano, M., Gadea, Andrés, Geibel, K., Gelletly, W., Jungclaus, Andrea, Leoni, S., Lewandowski, L., Liang, X., Lunardi, S., European Commission, Ministerio de Ciencia e Innovación (España), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Japan Society for the Promotion of Science, Bonn-Cologne Graduate School of Physics and Astronomy, Generalitat Valenciana, Federal Ministry of Education and Research (Germany), and National Science Foundation (US)
- Abstract
A Vogt et al. -- 17 pags., 11 figs., 4 tabs., The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 is identified as an isomer, closing a gap in the systematics along the N=81 isotones. Its half-life is measured to be 9.0(9) ns, corresponding to a reduced transition probability of B(E2,19/2-→15/2-)=0.52(6) W.u. The experimentally deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Latest shell-model calculations reproduce the experimental findings generally well and provide guidance to the interpretation of the new levels., The research leading to these results has received funding from the German BMBF under Contract No. 05P12PKFNE TP4, from the European Union Seventh Framework Programme FP7/2007- 2013 under Grant Agreement No. 262010-ENSAR, from the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04, from the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014- 57196-C5, from the UK Science and Technology Facilities Council (STFC), and from the US National Science Foundation (NSF). E.T. and N.Y. were supported by a Grant-in-Aid for Japan Society for the Promotion of Science (JSPS) Fellows (Grant No. 26.10429). A.V. and L.K. thank the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) for financial support. One of the authors (A. Gadea) has been supported by the Generalitat Valenciana, Spain, under the grant PROMETEOII/2014/019, and by the EU under the Fonds Europeen de D´eveloppement ´ Economique et R´egional program.
- Published
- 2017
39. Herramienta de emulación de micrófonos
- Author
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Rebolledo Gadea, Andrés and Gómez Alfageme, Juan José
- Subjects
Informática ,Electrónica - Abstract
A la hora de grabar señales provenientes de instrumentos musicales o voz en estudios de grabación se utilizan unos micrófonos determinados por cómo colorean la señal. Resulta interesante disponer de distintos tipos para poder ir combinándolos según las necesidades artísticas. El objetivo de este proyecto de fin de carrera es realizar una herramienta software en entorno gráfico programada en Matlab, en el que podremos cargar un archivo de audio grabado con un micrófono determinado, el programa lo procesará y el resultado se aproximará a como si se hubiese grabado con otro micrófono diferente. De esta forma, aunque dispongamos de un solo micrófono, se podrán emular todos los demás que hayamos cargado en el programa. La transformada rápida de Fourier (Fast Fourier Transform) es una herramienta fundamental en el procesado digital de señales. Se trata de un algoritmo para el cálculo de la transformada discreta de Fourier (DFT) de manera más rápida. Gracias a ella, podemos realizar una convolución en el dominio de la frecuencia realizando una multiplicación, lo que optimiza mucho los cálculos. Un sistema lineal e invariante en el tiempo (LTI) se puede caracterizar por su respuesta al impulso en el dominio temporal y por su respuesta en frecuencia en el dominio de la frecuencia. Se ha obtenido la respuesta en frecuencia de cada micrófono en cámara anecoica y guardado en archivos de Excel. Haciendo uso de la FFT, hemos diseñado un algoritmo que realiza la convolución de la señal con la respuesta en frecuencia del micrófono seleccionado. Como la señal es de una duración considerable, se ha utilizado el método solapamiento suma para realizar las operaciones por segmentos y después del tratamiento de la señal poder volverlos a unir convenientemente. Los micrófonos estudiados son los siguientes: - Beyerdynamic M69 TG - Shure SM58 - RODE NT5 - Shure beta 52A - AKG Perfection 400 - RODE NT 2000 ABSTRACT. When recording signals from musical instruments or voice in recording studios use microphones determined by how they color the signal. It is interesting to have different types to be able to combine them according to the artistic needs. The purpose of this project is to create a software tool in a graphical environment programmed in Matlab, in which we can upload an audio file recorded with a specific microphone, the program will process it and the result will approximate as if there were recorded with another microphone. In this way, even if we have a single microphone, we can emulate all the others we have loaded in the program. Fast Fourier Transform is a fundamental tool in digital signal processing. It is an algorithm for the calculation of the discrete Fourier transform (DFT) more quickly. Thanks to it, we can perform a convolution in the frequency domain by performing a multiplication, which greatly optimizes the calculations. A linear and time invariant system (LTI) can be characterized by its impulse response in the temporal domain and by its frequency response in the frequency domain. The frequency response of each microphone in the anechoic chamber has been obtained and saved in Excel files. Using the FFT, we have designed an algorithm that performs convolution of the signal with the frequency response of the selected microphone. As the signal is of considerable duration, the overlapping method has been used to perform the operations by segments and after the treatment of the signal to be able to re-attach them properly. The microphones studied are: - Beyerdynamic M69 TG - Shure SM58 - RODE NT5 - Shure beta 52A - AKG Perfection 400 - RODE NT 2000
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- 2017
40. Measurement of lifetimes in Fe 62,64, Co 61,63, and Mn 59
- Author
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Klintefjord, M., Ljungvall, J., Görgen, A., Pérez-Vidal, R. M., Gadea, Andrés, González, V., Jungclaus, Andrea, Sanchis, E., Valiente-Dobón, J. J., SCOAP, Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Swedish Research Council, European Commission, Laboratori Nazionali di Legnaro, and Research Council of Norway
- Abstract
M. Klintefjord et al. -- 11 pags., 8 figs., 1 tab. -- Open Access funded by Creative Commons Atribution Licence 4.0, Lifetimes of the 41+ states in Fe62,64 and the 11/21- states in Co61,63 and Mn59 were measured at the Grand Accélérateur National d'Ions Lourds (GANIL) facility by using the Advanced Gamma Tracking Array (AGATA) and the large-acceptance variable mode spectrometer (VAMOS++). The states were populated through multinucleon transfer reactions with a U238 beam impinging on a Ni64 target, and lifetimes in the picosecond range were measured by using the recoil distance Doppler shift method. The data show an increase of collectivity in the iron isotopes approaching N=40. The reduction of the subshell gap between the ν2p1/2 and ν1g9/2 orbitals leads to an increased population of the quasi-SU(3) pair (ν1g9/2,ν2d5/2), which causes an increase in quadrupole collectivity. This is not observed for the cobalt isotopes with N, The authors would also like to thank M. Loriggiola, Laboratori Nazionali di Legnaro, and G. Fremont, GANIL, for preparing the target and degrader foils. This project received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement n°654002. Support from the Norwegian Research Council, project grant 213442, is acknowledged. The project has received funding from the Swedish Research Council. This work is supported by the Spanish Ministerio de Economía y Competitividad under contract FPA2014-57196-C5-4-P. One of the authors, A. Gadea, was partially supported byMINECO and Generalitat Valenciana, Spain, under the grants FPA2014- 57196-C5 and PROMETEOII/2014/019, and by EU FEDER
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- 2017
41. Herramienta de emulación de micrófonos
- Author
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Gómez Alfageme, Juan José, Rebolledo Gadea, Andrés, Gómez Alfageme, Juan José, and Rebolledo Gadea, Andrés
- Abstract
A la hora de grabar señales provenientes de instrumentos musicales o voz en estudios de grabación se utilizan unos micrófonos determinados por cómo colorean la señal. Resulta interesante disponer de distintos tipos para poder ir combinándolos según las necesidades artísticas. El objetivo de este proyecto de fin de carrera es realizar una herramienta software en entorno gráfico programada en Matlab, en el que podremos cargar un archivo de audio grabado con un micrófono determinado, el programa lo procesará y el resultado se aproximará a como si se hubiese grabado con otro micrófono diferente. De esta forma, aunque dispongamos de un solo micrófono, se podrán emular todos los demás que hayamos cargado en el programa. La transformada rápida de Fourier (Fast Fourier Transform) es una herramienta fundamental en el procesado digital de señales. Se trata de un algoritmo para el cálculo de la transformada discreta de Fourier (DFT) de manera más rápida. Gracias a ella, podemos realizar una convolución en el dominio de la frecuencia realizando una multiplicación, lo que optimiza mucho los cálculos. Un sistema lineal e invariante en el tiempo (LTI) se puede caracterizar por su respuesta al impulso en el dominio temporal y por su respuesta en frecuencia en el dominio de la frecuencia. Se ha obtenido la respuesta en frecuencia de cada micrófono en cámara anecoica y guardado en archivos de Excel. Haciendo uso de la FFT, hemos diseñado un algoritmo que realiza la convolución de la señal con la respuesta en frecuencia del micrófono seleccionado. Como la señal es de una duración considerable, se ha utilizado el método solapamiento suma para realizar las operaciones por segmentos y después del tratamiento de la señal poder volverlos a unir convenientemente. Los micrófonos estudiados son los siguientes: - Beyerdynamic M69 TG - Shure SM58 - RODE NT5 - Shure beta 52A - AKG Perfection 400 - RODE NT 2000 ABSTRACT. When recording signals from musical instruments or voice in recording studio
- Published
- 2017
42. Pair neutron transfer in Ni 60 + Sn 116 probed via γ -particle coincidences
- Author
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Montanari, D., Corradi, L., Szilner, S., Pollarolo, G., Goasduff, A., Gadea, Andrés, Görgen, A., Gottardo, A., Jungclaus, Andrea, Karolak, M., Varga Pajtler, M., Generalitat Valenciana, Ministerio de Economía y Competitividad (España), European Commission, and Croatian Science Foundation
- Abstract
D. Montanari et al. ; 6 págs.; 5 figs.; 1 tab., We performed a γ-particle coincidence experiment for the Ni60+Sn116 system to investigate whether the population of the two-neutron pickup channel leading to Ni62 is mainly concentrated in the ground-state transition, as has been found in a previous work [D. Montanari et al., Phys. Rev. Lett. 113, 052501 (2014)PRLTAO0031-900710.1103/PhysRevLett.113.052501]. The experiment has been performed by employing the PRISMA magnetic spectrometer coupled to the Advanced Gamma Tracking Array (AGATA) demonstrator. The strength distribution of excited states corresponding to the inelastic, one- and two-neutron transfer channels has been extracted. We found that in the two-neutron transfer channel the strength to excited states corresponds to a fraction (less than 24%) of the total, consistent with the previously obtained results that the 2n channel is dominated by the ground-state to ground-state transition. ©2016 American Physical Society, This work was partly supported by the EU FP7/2007-2013 under Grant No. 262010-ENSAR and by the Croatian Science Foundation under Project No. 7194. A.G. was partially supported by MINECO and Generalitat Valenciana, Spain, under Grants No. FPA2014-57196-C5 and No. PROMETEOII/2014/019 and the EU under the FEDER program.
- Published
- 2016
43. Observations of the Gamow-Teller resonance in the rare-earth nuclei above Gd 146 populated in β decay
- Author
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Nácher, Enrique, Rubio, Berta, Algora, Alejandro, Cano Ott, Daniel, Taín, José Luis, Gadea, Andrés, Agramunt, Jorge, Gierlik, M., Karny, M., Janas, Z., Roeckl, E., Blazhev, A., Collatz, R., Döring, J., Hellström, M., Hu, Z., Kirchner, R., Mukha, I., Plettner, C., Shibata, M., Rykaczewski, K., Batist, L., Moroz, F., Wittmann, V., Valiente-Dobón, J. J., Ministerio de Economía y Competitividad (España), and Generalitat Valenciana
- Abstract
13 págs.; 11 figs. ; 1 tab., The rare-earth region of the nuclear table around the quasi-doubly magic nucleus Gd146 is one of the very few places in which the Gamow-Teller (GT) resonance can be populated in β decay. The appropriate technique to study such a phenomenon is total absorption spectroscopy, thanks to which one can measure the B(GT) distribution in β-decay experiments even when it is very fragmented and lies at high excitation energy in the daughter nucleus. Results on the GT resonance measured in the β decay of the odd-Z, N=83 nuclei Tb148, Ho150, and Tm152 are presented in this work and compared with shell-model calculations. The tail of the resonance is clearly observed up to the limit imposed by the Q value. This observation is important in the context of the understanding of the >quenching> of the GT strength. ©2016 American Physical Society, The authors would like to thank the GSI accelerator crew and the MSEP group for their support. This work has been partially supported by the Spanish Ministry (Grants No. FPA2005-03993, No. FPA200806419-C02-01, No. FPA2011- 24553, No. FPA2012-32443, No. FPA2014-57196-C5, and No. FPA2014-52823-C2-1-P) and the Generalitat Valenciana (PROMETEOII/2014/019).
- Published
- 2016
44. Pygmy dipole resonance in Ce 140 via inelastic scattering of O 17
- Author
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Krzysiek, M., Kmiecik, M., Maj, A., Bednarczyk, P., Bracco, A., Crespi, F.C.L., Lanza, E. G., Litvinova, E., Paar, N., Avigo, R., Gadea, Andrés, Giaz, A., Jungclaus, Andrea, Leoni, Silvia, Rosso, D., Salsac, M. D., Croatian Science Foundation, Ministerio de Economía y Competitividad (España), Generalitat Valenciana, and National Science Centre (Poland)
- Abstract
M. Krzysiek et al. ; 8 págs.; 7 figs. ; 2 tabs., The γ decay from the high-lying states of Ce140 excited via inelastic scattering of O17 at a bombarding energy of 340 MeV was measured using the high-resolution AGATA-demonstrator array in coincidence with scattered ions detected in two segmented ΔE-E silicon detectors. Angular distributions of scattered ions and emitted γ rays were measured, as well as their differential cross sections. The excitation of 1- states below the neutron separation energy is similar to the one obtained in reactions with the α isoscalar probe. The comparison between the experimental differential cross sections and the corresponding predictions using the distorted-wave Born approximation allowed us to extract the isoscalar component of identified 1- pygmy states. For this analysis the form factor obtained by folding microscopically calculated transition densities and optical potentials was used. ©2016 American Physical Society, This work has been partly supported by the stipend from Marian Smoluchowski Krakow Research Consortium ’Matter-Energy-Future’ as a Leading National Research Center (KNOW) and also by several grants: the Polish National Science Centre under Contracts No. 2015/17/B/ST2/01534, No. 2013/09/N/ST2/04093, No. 2013/08/M/ST2/00591, and No. 2011/03/B/ST2/01894; US-NSF Grants No. PHY-1204486 and No. PHY-1404343; Croatian Science Foundation under Project No. IP-2014-09-9159; the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5-4-P. Also, A. Gadea has been supported by MINECO, Spain, under Grant No. FPA2014-57196-C5; Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019; and the EU under the FEDER program. The research leading to these results has also received funding from the European Union Seventh Framework Programme FP7/2007-2013 under Grant Agreement No. 262010 - ENSAR.
- Published
- 2016
45. First observation of γ rays emitted from excited states south-east of Sn132: The πg−19/2⊗νf7/2 multiplet of In83132
- Author
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Jungclaus, Andrea, Gargano, A., Grawe, H., Taprogge, J., Nishimura, S., Gadea, Andrés, Ilieva, S., Itaco, N., Kröll, T., Montaner-Pizá, A., Moschner, K., Mücher, D., RIKEN Nishina Center for Accelerator-Based Science, National Research Foundation of Korea, Ministerio de Economía y Competitividad (España), Hungarian Scientific Research Fund, European Commission, Federal Ministry of Education and Research (Germany), Helmholtz International Center for FAIR, Ministerio de Ciencia e Innovación (España), and Generalitat Valenciana
- Abstract
A. Jungclaus et al. ; 6 págs.; 4 figs. ; Rapid Communications, For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic Sn132, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from Cd85133, populated in the projectile fission of a U238 beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g9/2-1 - ν1f7/2 particle-hole multiplet in In83132. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2-1 - νg9/2 analog multiplet in Tl127208, one major proton and one major neutron shell above, are presented. ©2016 American Physical Society, We thank the staff of the RIKEN Nishina Center accelerator complex for providing stable beams with high intensities to the experiment. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish Ministerio de Ciencia e Innovación under Contract No. FPA2011-29854-C04 and the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5- 4-P, the Generalitat Valenciana (Spain) under Grant No. PROMETEO/2010/101, the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. NRF-2012R1A1A1041763), the Priority Centers Research Program in Korea (2009-0093817), OTKA Contract No. K-100835, JSPS KAKENHI (Grant No. 25247045), the European Commission through the Marie Curie Actions call PEOPLE-2011FP7-IEF under Contract No. 300096 and the German BMBF (No. 05P12RDCIA and No. 05P12RDNUP), and Helmholtz International Center for FAIR.
- Published
- 2016
46. β decay of semi-magic 130Cd: Revision and extension of the level scheme of 130 In
- Author
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Jungclaus, Andrea, Grawe, H., Nishimura, S., Doornenbal, P., Lorusso, G., Taprogge, J., Gadea, Andrés, Ilieva, S., Itaco, N., Kondev, F.G., Kröll, T., Montaner-Pizá, A., Federal Ministry of Education and Research (Germany), German Research Foundation, Science and Technology Facilities Council (UK), Department of Energy (US), European Commission, National Research Foundation of Korea, Generalitat Valenciana, Ministerio de Ciencia e Innovación (España), RIKEN Nishina Center for Accelerator-Based Science, and Ministerio de Economía y Competitividad (España)
- Abstract
A. Jungclaus et al.; 8 págs.; 5 figs.; 3 tabs., The β decay of the semi-magic nucleus Cd130 has been studied at the RIBF facility at the RIKEN Nishina Center. The high statistics of the present experiment allowed for a revision of the established level scheme of In130 and the observation of additional β feeding to high-lying core-excited states in In130. The experimental results are compared to shell-model calculations employing a model space consisting of the full major N=50-82 neutron and Z=28-50 proton shells and the NA-14 interaction, and good agreement is found. ©2016 American Physical Society, We thank the staff of the RIKEN Nishina Center accelerator complex for providing stable beams with high intensities to the experiment. We acknowledge the EUROBALL Owners Committee for the loan of germanium detectors and the PreSpec Collaboration for the readout electronics of the cluster detectors. This work was supported by the Spanish Ministerio de Ciencia e Innovación under contract FPA2011-29854-C04 and the Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5- 4-P, the Generalitat Valenciana (Spain) under Grant No. PROMETEO/2010/101, the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (NRF-2014S1A2A2028636, 2016K1A3A7A09005579), the Priority Centers Research Program in Korea (2009-0093817), OTKA Contract No. K-100835, JSPS KAKENHI (Grant No. 25247045), the European Commission through the Marie Curie Actions call FP7-PEOPLE-2011-IEF under Contract No. 300096, the US Department of Energy, Office of Nuclear Physics, under Contract No.DE-AC02-06CH11357, the STFC (UK), the “RIKEN foreign research program,” the German BMBF (No. 05P12RDCIA, No. 05P12RDNUP, and No. 05P12PKFNE), HIC for FAIR, the DFG cluster of excellence “Origin and Structure of the Universe,” and DFG (Contract No. KR2326/2-1).
- Published
- 2016
47. Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe 56 → Fe 54 Reaction at Relativistic Energies
- Author
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Podolyák, Z., Pérez-Vidal, R. M., Gadea, Andrés, González, V., Jungclaus, Andrea, Quintana, B., Sanchis, E., Federal Ministry of Education and Research (Germany), Ministerio de Economía y Competitividad (España), Science and Technology Facilities Council (UK), Generalitat Valenciana, Helmholtz Centre for Heavy Ion Research, European Commission, and Swedish Research Council
- Abstract
Z. Podolyák et al. ; 6 pags.; 5 figs., The Fe54 nucleus was populated from a Fe56 beam impinging on a Be target with an energy of E/A=500 MeV. The internal decay via γ-ray emission of the 10+ metastable state was observed. As the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the Fe56 ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of Fe54, suggesting that it was populated via the decay of the Δ0 resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10+ metastable state in Fe54 is a consequence of the quark structure of the nucleons. © 2016 American Physical Society, We thank the GSI accelerator staff for their excellent work. This work is supported by the STFC(UK), the Swedish Research Council, the German BMBF under Grants No. 05P15RD FN1, No. 05P12RDFN8, MINECO, Spain, under FPA2014-57196-C5, Generalitat Valenciana, Spain, under No. PROMETEOII/2014/019 and by the FEDER funds of the European Commission. This work has been supported by the European Community FP7–Capacities, ENSAR Contract No. 262010.
- Published
- 2016
48. Population of the 2(ms)(+) mixed-symmetry state of Ba-140 with the alpha-transfer reaction
- Author
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Stahl, C., Leske, J., Bauer, C., Gadea, Andrés, Jungclaus, Andrea, Theisen, Ch., Ur, C. A., Valiente-Dobón, J. J., Federal Ministry of Education and Research (Germany), Generalitat Valenciana, European Commission, Laboratori Nazionali di Legnaro, Helmholtz International Center for FAIR, and Ministerio de Economía y Competitividad (España)
- Abstract
C. Stahl et al.; 7 pags.; 6 figs.; 1 tab.; PACS number(s): 21.10.Re, 21.60.Fw, 25.40.Hs, Background: Identification of proton-neutron mixed-symmetric one-quadrupole phonon excitations (the 2(ms)(+) states) of atomic nuclei provides information on the isovector part of the residual nucleon-nucleon interaction. It was predicted that the 2(ms)(+) state of particular nuclei close to the U(5) limit of the interacting boson model, in particular Ba-140, should be considerably populated by alpha-transfer reactions [C. E. Alonso et al., Phys. Rev. C 78, 017301 (2008)]. Purpose: We aim at the identification of the 2(ms)(+) mixed-symmetry state (MSS) of radioactive Ba-140 and investigate its population by the alpha-transfer reaction as a suitable tool to selectively populate MSSs and as a potential new signature for its mixed-symmetric character. Method: A gamma-ray spectroscopy experiment was performed in inverse kinematics in order to populate the 2(ms)(+) state of Ba-140 by alpha-transfer from a C-nat target on Xe-136 beam ions. The population of the candidate for the 2(ms)(+) state of Ba-140 was measured relative to the population of the 2(1)(+) state. Results: The candidate for the 2(ms)(+) state of Ba-140 was populated by a transfer three times weaker than predicted. Another 2(+) state that can be ruled out as the MSS was in turn as strongly populated by the a transfer as predicted for the MSS. Conclusions: The relative population of 2(+) states by alpha-transfer cannot serve as a new signature for MSSs, since other 2(+) states are also strongly populated. Nevertheless, the substantial population of the MSS candidate of Ba-140 by alpha transfer qualifies this type of reaction as suitable tool to excite MSSs and study their electromagnetic decay properties. ©2015 American Physical Society, We thank the accelerator crew of the Laboratori Nazionali di Legnaro for providing the xenon beam, and K.-H. Speidel, A. Vitturi, O. Moller, G. Rainovski, and V. Werner for fruitful ¨ discussions. This work was supported by HIC for FAIR and the German BMBF under Grants No. 05P09RDFN4 and No. 05P12RDFN8. A. Gadea has been supported by MINECO, Spain, under the grant FPA2014-57196-C5, Generalitat Valenciana, Spain, under the grant PROMETEOII/2014/019, and by the EU under the FEDER program.
- Published
- 2015
49. Spectroscopy of neutron-rich P 34,35,36,37,38 populated in binary grazing reactions
- Author
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Chapman, R., Hodsdon, A., Bouhelal, M., Gadea, Andrés, Jungclaus, Andrea, Keyes, K., Szilner, S., Trotta, M., Verney, D., Laboratori Nazionali di Legnaro, Engineering and Physical Sciences Research Council (UK), Ministerio de Ciencia e Innovación (España), and Hungarian Scientific Research Fund
- Abstract
R. Chapman et al.; 17 pags.; 18 figs.; 1 tab.; PACS number(s): 23.20.Lv, 25.70.Lm, 27.30.+t, © 2015 American Physical Society. The neutron-rich nuclei P34,35,36,37,38 were populated in binary grazing reactions initiated by a beam of S36 ions at 215 MeV incident on a thin Pb208 target. The combination of the PRISMA magnetic spectrometer and the CLARA array of escape-suppressed Ge detectors was used to detect γ rays in coincidence with projectile-like nuclear species. Further evidence to support the observed γ decay of excited states of the populated phosphorus isotopes is provided by γ-γ coincidence measurements based on the results of an earlier thick-target deep-inelastic experiment. Level schemes for P34,35,36,37,38 are presented and discussed within the context of state-of-the-art shell-model calculations. In particular, new spin and parity assignments are proposed for a number of excited states of P36. The evolution with neutron number of the energy difference of the low-lying Jπ=3/2+ and 1/2+ states in the odd-A isotopes of phosphorus, as well as the relationship to nuclear collectivity, is discussed. The evolution with neutron number of the shell-model wave functions of the first Jπ=1/2+, 3/2+, and 5/2+ states of the odd-A phosphorus isotopes and of the first Jπ=3-, 4-, and 5- states of the even-A isotopes is also explored., We would like to thank the technical staff of the INFN Legnaro National Laboratory for their support during this experiment. This work was supported by the EPSRC (U.K). Four of us (A.H., M.B., K.L.K., and A.P.) would like to acknowledge the receipt of financial support from EPSRC during the course of this work. A.J. would like to acknowledge support from the Spanish Ministerio de Ciencia e Innovacion´ under Contract No. FPA2011-29854-C04. Z.D. acknowledges the financial support from OTKA Grant No. K100835.
- Published
- 2015
50. Light and heavy transfer products in Xe 136 + U 238 multinucleon transfer reactions
- Author
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Vogt, A., Birkenbach, B., Reiter, P., Corradi, L., Mijatovic, T., Gadea, Andrés, Jungclaus, Andrea, Vandone, V., Wiens, A., Generalitat Valenciana, Ministerio de Economía y Competitividad (España), Bonn-Cologne Graduate School of Physics and Astronomy, Ministerio de Ciencia e Innovación (España), Federal Ministry of Education and Research (Germany), and European Commission
- Abstract
A. Vogt et al.; 12 pags.; 14 figs.; PACS number(s): 24.10.−i, 25.70.Hi, 29.30.Aj, 29.40.Gx, © 2015 American Physical Society. ©2015 American Physical Society. Background: Multinucleon transfer reactions (MNT) are a competitive tool to populate exotic neutron-rich nuclei in a wide region of nuclei, where other production methods have severe limitations or cannot be used at all. Purpose: Experimental information on the yields of MNT reactions in comparison with theoretical calculations are necessary to make predictions for the production of neutron-rich heavy nuclei. It is crucial to determine the fraction of MNT reaction products which are surviving neutron emission or fission at the high excitation energy after the nucleon exchange. Method: Multinucleon transfer reactions in Xe136+U238 have been measured in a high-resolution γ-ray/particle coincidence experiment. The large solid-angle magnetic spectrometer PRISMA coupled to the high-resolution Advanced Gamma Tracking Array (AGATA) has been employed. Beamlike reaction products after multinucleon transfer in the Xe region were identified and selected with the PRISMA spectrometer. Coincident particles were tagged by multichannel plate detectors placed at the grazing angle of the targetlike recoils inside the scattering chamber. Results: Mass yields have been extracted and compared with calculations based on the grazing model for MNT reactions. Kinematic coincidences between the binary reaction products, i.e., beamlike and targetlike nuclei, were exploited to obtain population yields for nuclei in the actinide region and compared to x-ray yields measured by AGATA. Conclusions: No sizable yield of actinide nuclei beyond Z=93 is found to perform nuclear structure investigations. In-beam γ-ray spectroscopy is feasible for few-neutron transfer channels in U and the -2p channel populating Th isotopes., The research leading to these results has received funding from the German Bundesministerium fur Bildung ¨ und Forschung (BMBF) under Contract No. 05P12PKFNE TP4, the European Union Seventh Framework Programme (FP7/2007-2013) under Grant No. 262010-ENSAR, and the Spanish Ministerio de Ciencia e Innovacion under Contract ´ No. FPA2011-29854-C04. A.V. thanks the Bonn-Cologne Graduate School of Physics and Astronomy (BCGS) for financial support. One of the authors (A. Gadea) was supported by MINECO, Spain, under Grants No. FPA2011-29854-C04 and No. FPA2014-57196-C5, Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019, and EU under the FEDER program.
- Published
- 2015
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