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1. Evidence for a Novel Reaction Mechanism of a Prompt Shock-Induced Fission Following the Fusion of 78Kr and 40Ca Nuclei at E/A =10 MeV

Author

Henry, E., Toke, J., Nyibule, S., Quinlan, M., Schroder, W. U., Ademard, G., Amorini, F., Auditore, L., Beck, C., Berceanu, I., Bonnet, E., Borderie, B., Cardella, G., Chbihi, A., Colonna, M., De Filippo, E., DOnofrio, A., Frankland, J. D., Geraci, E., La Guidara, E., La Commara, M., Lanzalone, G., Lautesse, P., Lebhertz, D., Neindre, N. Le, Lombardo, I., Loria, D., Mazurek, K., Pagano, A., Papa, M., Piasecki, E., Pirrone, S., Politi, G., Porto, F., Rizzo, F., Rosato, E., Rusotto, P., Spadaccini, G., Trifiro, A., Trimarchi, M., Verde, G., Vigilante, M., and Wieleczko, J. P.

Subjects
Nuclear Experiment
Abstract

An analysis of experimental data from the inverse-kinematics ISODEC experiment on 78Kr+40Ca reaction at a bombarding energy of 10 AMeV has revealed signatures of a hitherto unknown reaction mechanism, intermediate between the classical damped binary collisions and fusion-fission, but also substantially different from what is being termed in the literature as fast fission or quasi fission. These signatures point to a scenario where the system fuses transiently while virtually equilibrating mass asymmetry and energy and, yet, keeping part of the energy stored in a collective shock-imparted and, possibly, angular momentum bearing form of excitation. Subsequently the system fissions dynamically along the collision or shock axis with the emerging fragments featuring a broad mass spectrum centered around symmetric fission, relative velocities somewhat higher along the fission axis than in transverse direction, and virtually no intrinsic spin. The class of massasymmetric fission events shows a distinct preference for the more massive fragments to proceed along the beam direction, a characteristic reminiscent of that reported earlier for dynamic fragmentation of projectile-like fragments alone and pointing to the memory of the initial mass and velocity distribution., Comment: 5 PAGES, 6 FIGURES

Published
2014

2. Semi-supervised Eigenvectors for Large-scale Locally-biased Learning

Author

Hansen, Toke J. and Mahoney, Michael W.

Subjects
Computer Science - Learning, Mathematics - Spectral Theory, Statistics - Machine Learning
Abstract

In many applications, one has side information, e.g., labels that are provided in a semi-supervised manner, about a specific target region of a large data set, and one wants to perform machine learning and data analysis tasks "nearby" that prespecified target region. For example, one might be interested in the clustering structure of a data graph near a prespecified "seed set" of nodes, or one might be interested in finding partitions in an image that are near a prespecified "ground truth" set of pixels. Locally-biased problems of this sort are particularly challenging for popular eigenvector-based machine learning and data analysis tools. At root, the reason is that eigenvectors are inherently global quantities, thus limiting the applicability of eigenvector-based methods in situations where one is interested in very local properties of the data. In this paper, we address this issue by providing a methodology to construct semi-supervised eigenvectors of a graph Laplacian, and we illustrate how these locally-biased eigenvectors can be used to perform locally-biased machine learning. These semi-supervised eigenvectors capture successively-orthogonalized directions of maximum variance, conditioned on being well-correlated with an input seed set of nodes that is assumed to be provided in a semi-supervised manner. We show that these semi-supervised eigenvectors can be computed quickly as the solution to a system of linear equations; and we also describe several variants of our basic method that have improved scaling properties. We provide several empirical examples demonstrating how these semi-supervised eigenvectors can be used to perform locally-biased learning; and we discuss the relationship between our results and recent machine learning algorithms that use global eigenvectors of the graph Laplacian.

Published
2013

3. Surface Boiling - a New Type of Instability of Highly Excited Atomic Nuclei

Author

Tõke, J. and Schröder, W. U.

Subjects
Nuclear Theory
Abstract

The evolution of the nuclear matter density distribution with excitation energy is studied within the framework of a finite-range interacting Fermi gas model and microcanonical thermodynamics in Thomas-Fermi approximation. It is found that with increasing excitation energy, both infinite and finite systems become unstable against infinitesimal matter density fluctuations, albeit in different ways. In modeling, this instability reveals itself via an apparent negative heat capacity of the system and is seen to result in the volume boiling in the case of infinite matter and surface boiling in the case of finite systems. The latter phenomenon of surface boiling is unique to small systems and it appears to provide a natural explanation for the observed saturation-like patterns in what is commonly termed caloric curves and what represents functional dependence of nuclear temperature on the excitation energy., Comment: 17 pages, 4 figures

Published
2012

4. Status of the LUX Dark Matter Search

Author

Fiorucci, S., Akerib, D. S., Bedikian, S., Bernstein, A., Bolozdynya, A., Bradley, A., Carr, D., Chapman, J., Clark, K., Classen, T., Curioni, A., Dahl, E., Dazeley, S., de Viveiros, L., Druszkiewicz, E., Gaitskell, R., Hall, C., Faham, C. Hernandez, Holbrook, B., Kastens, L., Kazkaz, K., Lander, R., Lesko, K., Malling, D., Mannino, R., McKinsey, D., Mei, D., Mock, J., Nikkel, J., Phelps, P., Schroeder, U., Shutt, T., Skulski, W., Sorensen, P., Spaans, J., Stiegler, T., Svoboda, R., Sweany, M., Thomson, J., Toke, J., Tripathi, M., Walsh, N., Webb, R., White, J., Wolfs, F., Woods, M., and Zhang, C.

Subjects
Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of design which make the experiment a very strong competitor in the field of direct detection, as well as an easily scalable concept. We will also present its potential reach for supersymmetric dark matter detection, within various timeframes ranging from 1 year to 5 years or more., Comment: 4 pages, in proceedings of the SUSY09 conference

Published
2009
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5. Isoscaling in statistical fragment emission in an extended compound nucleus model

Author

Ye, W., Tõke, J., and Schröder, W. U.

Subjects
Nuclear Theory
Abstract

Based on an extended compound nucleus model, isospin effects in statistical fragment emission from excited nuclear systems are investigated. An experimentally observed scaling behavior of the ratio of isotope yields $Y_i(N,Z)$ from two similar emitting sources with different neutron-to-proton ratios is predicted theoretically, i.e., the relationship of $Y_2/Y_1 \propto exp(\alpha N + \beta Z)$ is demonstrated. The symmetry energy coefficient $C_{sym}$ extracted from the simulation results is $\sim$ 27 MeV which is consistent with realistic theoretical estimates and recent experimental data. The influence of the surface entropy on the isoscaling behavior is discussed in detail. It is found that although the surface entropy increases the numercial values of isoscaling parameters $\alpha$ and $\beta$, it does not affect the isoscaling behavior qualitatively and has only a minor effect on the extracted symmetry energy coefficient., Comment: 10 pages, 6 figures

Published
2008
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6. Common Signatures of Statistical Coulomb Fragmentation of Highly Excited Nuclei and Phase Transitions in Confined Microcanonical Systems

Author

Tõke, J., Quinlan, M. J., Pawelczak, I., and Schröder, W. U.

Subjects
Nuclear Theory
Abstract

Characteristic signatures of statistical Coulomb fragmentation of highly excited nuclear systems were analyzed. It was found that in some important aspects, they coincide with perceived signatures of phase transitions in confined hypothetical pseudo-microcanonical systems, thus potentially giving rise to a false interpretation of experimental observations in terms of phase transitions. It is demonstrated that the heat capacity as derived based on experimental observations may show domains of faux negative heat capacity for the same fundamental reason a faux negative heat capacity appears in constrained numerical modeling of phase transitions in excited nuclear matter, the reason being an effective truncation of the microcanonical phase space. Similarly, selected experimental data may exhibit bimodality apparently in accordance with the truncated pseudo-microcanonical (but not the true microcanonical) calculations for confined systems., Comment: 23 pages, 7 figures

Published
2008
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7. R & D for Future Zeplin

Author

Bisset, R., Carson, M. J., Chagani, H., Cline, D. B., Daw, E. J., Ferbel, T., Gao, J., Gao, Y. S., Kudryavtsev, V. A., Lightfoot, P. K., Majewski, P., Maxin, J., Miller, J., Ooi, W. C., Robinson, M., Salinas, G., Schroeder, U., Seifert, J., Sergiampietri, F., Skulski, W., Smith, P. F., Spooner, N. J. C., Toke, J., Wang, H., White, J. T., Wolfs, F., and Yang, X.

Subjects
Astrophysics
Abstract

We propose a new concept for a very low background multi-ton liquid xenon Dark Matter experiment. The detector consists of two concentric spheres and a charge readout device in the centre. Xenon between the two spheres forms a self-shield and veto device. The inner surface of the central sphere is coated with CsI to form an internal photocathode with minimum of 2\pi coverage for any event in the active volume. Photoelectrons from the CsI photocathode drift toward the charge readout micro-structure in the centre of the detector. Both scintillation and ionisation are measured simultaneously for background rejection and 3-D event mapping. In addition to external shielding, the low background is achieved by eliminating PMTs and by using low radioactivity pure materials throughout the detector. We present detailed calculations of the charge readout system and design details. The detector is expected to probe the full SUSY parameter space., Comment: to appear in Proc. 7th UCLA Symposium on Sources and Detection of Dark Matter and Dark Energy in the Universe, 22-24 February, Marina del Rey, USA; Nucl. Phys. B Proc. Suppl., in press; 4 pages, 3 figues

Published
2007
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8. Retardation of Particle Evaporation from Excited Nuclear Systems Due to Thermal Expansion

Author

Tõke, J., Pieńkowski, L., Houck, M., Schröder, W. U., and Sobotka, L. G.

Subjects
Nuclear Theory
Abstract

Particle evaporation rates from excited nuclear systems at equilibrium matter density are studied within the Harmonic-Interaction Fermi Gas Model (HIFGM) combined with Weisskopf's detailed balance approach. It is found that thermal expansion of a hot nucleus, as described quantitatively by HIFGM, leads to a significant retardation of particle emission, greatly extending the validity of Weisskopf's approach. The decay of such highly excited nuclei is strongly influenced by surface instabilities.

Published
2005
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9. The Caloric Curve for Mononuclear Configurations

Author

Sobotka, L. G., Charity, R. J., Toke, J., and Schroder, W. U.

Subjects
Nuclear Theory
Abstract

The caloric curve for mononuclear configurations is studied with a schematic model. We investigate the dependence of the entropy on the density and effective mass profiles. A plateau in the caloric curve is a direct result of decreasing density and the destruction of correlations with increasing excitation. The mononuclear regime is metastable with respect to binary fission at low excitation energy and unstable with respect to multifragmentation at high excitation. The statistical framework presented here is suitable to treat scenarios where experimental conditions are set to favor population of highly excited mononuclear states., Comment: 4 pages, 4 figures, 3 color

Published
2004
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10. Influence of the Coulomb Interaction on the Chemical Equilibrium of Nuclear Systems at Break-Up

Author

Tõke, J., Gawlikowicz, W., and Schröder, W. U.

Subjects
Nuclear Theory
Abstract

The importance of a Coulomb correction to the formalism proposed by Albergo et al. for determining the temperatures of nuclear systems at break-up and the ensities of free nucleon gases is discussed. While the proposed correction has no effect on the temperatures extracted based on double isotope ratios, it becomes non-negligible when such temperatures or densities of free nucleon gases are extracted based on multiplicities of heavier fragments of different atomic numbers.

Published
2000
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11. Statistical Interpretation of Joint Multiplicity Distributions of Neutrons and Charged Particles

Author

Toke, J., Agnihotri, D. K., Skulski, W., and Schroeder, W. U.

Subjects
Nuclear Experiment
Abstract

Experimental joint multiplicity distributions of neutrons and charged particles emitted in complex nuclear reactions provide an important test of theoretical models. The method is applied to test three different theoretical models of nuclear multi-fragmentation, two of which fail the test. The measurement of neutrons is decisive in distinguishing between the Berlin and Copenhagen models of nuclear multi-fragmentation and challenges the interpretation of pseudo- Arrhenius plots. Statistical-model evaporation calculations with GEMINI give a good reproduction first and second moments of the experimental multiplicity correlations., Comment: 12 pages, 3 figures Added GEMINI calculations of multiplicity correlations Added brief discussion of how neutron emission is treated in MMMC

Published
1999
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12. Status of the LUX Dark Matter Search

Author

Fiorucci, S, Akerib, DS, Bedikian, S, Bernstein, A, Bolozdynya, A, Bradley, A, Carr, D, Chapman, J, Clark, K, Classen, T, Curioni, A, Dahl, E, Dazeley, S, de Viveiros, L, Druszkiewicz, E, Gaitskell, R, Hall, C, Hernandez Faham, C, Holbrook, B, Kastens, L, Kazkaz, K, Lander, R, Lesko, K, Malling, D, Mannino, R, McKinsey, D, Mei, D, Mock, J, Nikkel, J, Phelps, P, Schroeder, U, Shutt, T, Skulski, W, Sorensen, P, Spaans, J, Stiegler, T, Svoboda, R, Sweany, M, Thomson, J, Toke, J, Tripathi, M, Walsh, N, Webb, R, White, J, Wolfs, F, Woods, M, Zhang, C, Alverson, George, Nath, Pran, and Nelson, Brent

Subjects
Nuclear and Plasma Physics, Particle and High Energy Physics, Physical Sciences, Dark Matter, LUX, astro-ph.CO, astro-ph.IM
Abstract

The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of design which make the experiment a very strong competitor in the field of direct detection, as well as an easily scalable concept. We will also present its potential reach for supersymmetric dark matter detection, within various timeframes ranging from 1 year to 5 years or more. © 2010 American Institute of Physics.

Published
2010

13. Status of the LUX dark matter search

Author

Fiorucci, S, Akerib, DS, Bedikian, S, Bernstein, A, Bolozdynya, A, Bradley, A, Carr, D, Chapman, J, Clark, K, Classen, T, Curioni, A, Dahl, E, Dazeley, S, De Viveiros, L, Druszkiewicz, E, Gaitskell, R, Hall, C, Hernandez Faham, C, Holbrook, B, Kastens, L, Kazkaz, K, Lander, R, Lesko, K, Malling, D, Mannino, R, McKinsey, D, Mei, D, Mock, J, Nikkel, J, Phelps, P, Schroeder, U, Shutt, T, Skulski, W, Sorensen, P, Spaans, J, Stiegler, T, Svoboda, R, Sweany, M, Thomson, J, Toke, J, Tripathi, M, Walsh, N, Webb, R, White, J, Wolfs, F, Woods, M, and Zhang, C

Subjects
Dark Matter, LUX, astro-ph.CO, astro-ph.IM
Abstract

The Large Underground Xenon (LUX) dark matter search experiment is currently being deployed at the Homestake Laboratory in South Dakota. We will highlight the main elements of design which make the experiment a very strong competitor in the field of direct detection, as well as an easily scalable concept. We will also present its potential reach for supersymmetric dark matter detection, within various timeframes ranging from 1 year to 5 years or more. © 2010 American Institute of Physics.

Published
2009

14. Probing the Concept of Statistical Independence of Intermediate-Mass Fragment Production in Heavy-Ion Collisions

Author

Skulski, W., Toke, J., and Schroeder, W. U.

Subjects
Nuclear Experiment
Abstract

It is found that the total IMF-transverse-energy (E_t) spectra in multi-IMF events are well represented by synthetic spectra obtained by folding of the single-IMF spectrum. Using the experimental IMF multiplicity distribution, the observed trends in the IMF multiplicity distribution for fixed values of E_t are reproduced. The synthetic distributions show binomial reducibility and Arrhenius-like scaling, similar to that reported in the literature. Similar results are obtained when the above folding-type synthesis is replaced with one based on mixing events with different IMF multiplicities. For statistically independent IMF emission, the observed binomial reducibility and Arrhenius-type scaling are merely reflections of the shape of the single-IMF transverse-energy spectrum. Hence, a valid interpretation of IMF distributions in terms of a particular production scenario has to explain independently the observed shape of the single-IMF E_t spectrum., Comment: 13 pages with 8 figure

Published
1998
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15. A New Type of Shape Instability of Hot Nuclei and Prompt Nuclear Fragmentation

Author

Toke, J. and Schroeder, W. U.

Subjects
Nuclear Theory
Abstract

A novel mechanism of prompt nuclear fragmentation is proposed. Assuming micro-canonical or canonical equilibrium, it is shown that a strong enhancement of the accessible phase space volume, due to the diffuceness of the nuclear surface, leads to dynamical instabilities of hot nuclei and to prompt fragmentation. Equations are derived for the transition temperature T_T, for which the thermodynamical surface tension vanishes, as well as for the thermodynamical fissility parameter chi_td., Comment: 11 pages, 2 figures

Published
1998
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16. Isospin influence on the decay modes of the systems produced in the 78,86Kr +40,48Ca reactions at 10 AMeV

Author

Gnoffo B., Pirrone S., Politi G., La Commara M., Wieleczko J.P., De Filippo E., Russotto P., Trimarchi M., Vigilante M., Ademard G., Amorini F., Auditore L., Beck C., Bercenau I., Bonnet E., Borderie B., Cardella G., Chibihi A., Colonna M., D’Onofrio A., Frankland J.D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., LeNeidre N., Lombardo I., Mazurek K., Norella S., Pagano A., Pagano E.V., Papa M., Piasecki E., Porto F., Quattrocchi L., Quinlann M., Rizzo F., Shoroeder U., Spadaccini G., Trifirò A., Toke J., and Verde G.

Subjects
Physics, QC1-999
Abstract

The results of the analysis of the reactions 78,86Kr +40,48 Ca at 10 AMeV are presented. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multidetector CHIMERA, with beams delivered by the Superconductive Cyclotron. The competition among the various disintegration paths and in particular the isospin effects on the decay modes of the produced composite systems are investigated; this provides information about fundamental nuclear quantities such as level density, fission barrier and viscosity. Different isotopic composition and relative richness are observed among the reaction products of the two systems. An odd-even staggering effect is present in the charge distributions, in particular for the light fragments produced by the neutron-poor system. The kinematical characteristics of the IMF seem to indicate a high degree of the relaxation of the formed system. Besides, global features analysis seems to show some differences in the contribution arising from the various reaction mechanisms for the two reactions.

Published
2016
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17. Isospin influence on the decay modes of compound systems produced in the 78,86Kr + 40,48Ca at 10 AMeV

Author

Pirrone S., Politi G., Wieleczko J.P., De Filippo E., Gnoffo B., Russotto P., Trimarchi M., La Commara M., Vigilante M., Ademard G., Amorini F., Auditore L., Beck C., Berceanu I., Bonnet E., Borderie B., Cardella G., Chibihi A., Colonna M., D’Onofrio A., Frankland J. D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., Le Neindre N., Lombardo I., Mazurek K., Norella S., Pagano A., Pagano E.V., Papa M., Piasecki E., Porto F., Quattrocchi L., Quinlann M., Rizzo F., Schroeder W. U., Spadaccini G., Trifirò A., Toke J., and Verde G.

Subjects
Physics, QC1-999
Abstract

The study of the decay modes competition of the compound systems produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10AMeV is presented. In particular, the N/Z entrance channel influence on the decay paths of the compound systems, directly connected to the isospin influence, is investigated. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multi-detector CHIMERA. Charge, mass, angular distributions and kinematical features of the reaction products were studied. The analysis shows some differences in the contribution arising from the various reaction mechanisms for the neutron poor and neutron rich systems. Comparison with theoretical statistical and dynamical models are presented for the two systems. Besides a study of the influence of the energy on the entrance channel is performed for the 78Kr+40Ca reaction, by comparing the results of this experiment to those obtained for the same system at 5.5 AMeV with the INDRA device at GANIL.

Published
2016
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18. High mortality within 90 days of diagnosis in patients with Cushing's syndrome: results from the ERCUSYN registry

Author

Valassi, E, Tabarin, A, Brue, T, Feelders, RA, Reincke, M, Netea-Maier, R, Toth, M, Zacharieva, S, Webb, SM, Tsagarakis, S, Chanson, P, Pfeiffer, M, Droste, M, Komerdus, I, Kastelan, D, Maiter, D, Chabre, O, Franz, H, Santos, A, Strasburger, CJ, Trainer, PJ, Newell-Price, J, Ragnarsson, O, Ambroglo, A, Aranda, G, Arosio, M, Balomenaki, M, Beck-Peccoz, P, Berr-Kirmair, C, Bolanowski, M, Bollerslev, J, Thierry, B, Carvalho, D, Cavagnini, F, Christ, E, Demtroder, F, Denes, J, Dimopoulou, C, Dreval, A, Dusek, T, Erdinc, E, Evang, JA, Fazel, J, Fica, S, Ghigo, E, Greenman, Y, Greisa, V, Halperin, I, Hanzu, FA, Hermus, A, Johannsson, G, Kamenicky, P, Kasperlik-Zaluska, A, Kirchner, J, Darko, K, Kraljevic, I, Kruszynska, A, Lambrescu, I, Lang, S, Luger, A, Marpole, N, Martin, S, Martinie, M, Moros, O, Orbetzova, M, Paiva, I, Giraldi, FP, Pereira, AM, Pickel, J, Pirags, V, Reghina, AD, Riesgo, P, Roberts, M, Roerink, S, Roig, O, Rowan, C, Rudenko, P, Sahnoun, MA, Salvador, J, Sigurjonsdottir, HA, Polovina, TS, Smith, R, Stachowska, B, Stalla, G, Toke, J, Ubina, E, Vinay, S, Wagenmakers, M, Werner, S, Young, J, Zdunowski, P, Zopf, K, Zopp, S, Zosin, I, and ERCUSYN Study Grp

Abstract

Objective: Patients with Cushing's syndrome (CS) have increased mortality. The aim of this study was to evaluate the causes and time of death in a large cohort of patients with CS and to establish factors associated with increased mortality. Methods: In this cohort study, we analyzed 1564 patients included in the European Registry on CS (ERCUSYN); 1045 (67%) had pituitary-dependent CS, 385 (25%) adrenal-dependent CS, 89 (5%) had an ectopic source and 45 (3%) other causes. The median (IQR) overall follow-up time in ERCUSYN was 2.7 (1.2-5.5) years. Results: Forty-nine patients had died at the time of the analysis; 23 (47%) with pituitary-dependent CS, 6 (12%) with adrenal-dependent CS, 18 (37%) with ectopic CS and two (4%) with CS due to other causes. Of 42 patients whose cause of death was known, 15 (36%) died due to progression of the underlying disease, 13 (31%) due to infections, 7 (17%) due to cardiovascular or cerebrovascular disease and 2 due to pulmonary embolism. The commonest cause of death in patients with pituitary-dependent CS and adrenal-dependent CS were infectious diseases (n = 8) and progression of the underlying tumor (n = 10) in patients with ectopic CS. Patients who had died were older and more often males, and had more frequently muscle weakness, diabetes mellitus and ectopic CS, compared to survivors. Of 49 deceased patients, 22 (45%) died within 90 days from start of treatment and 5 (10%) before any treatment was given. The commonest cause of deaths in these 27 patients were infections (n = 10; 37%). In a regression analysis, age, ectopic CS and active disease were independently associated with overall death before and within 90 days from the start of treatment. Conclusion: Mortality rate was highest in patients with ectopic CS. Infectious diseases the commonest cause of death soon after diagnosis, emphasizing the need for careful vigilance at that time, especially in patients presenting with concomitant diabetes mellitus.

Published
2019

19. Decay competition for IMF produced in the collisions 78Kr+40Ca and 86Kr+48Ca at 10 A·MeV

Author

La Commara M., Pirrone S., Politi G., Wieleczko J.P., Ademard G., De Filippo E., Vigilante M., Amorini F., Auditore L., Beck C., Berceanu I., Bonnet E., Borderie B., Cardella G., Chbihi A., Colonna M., Frankland J.D., Geraci E., Henry E., La Guidara E., Lanzalone G., Lautesse P., Lebhertz D., Le Neindre N., Lombardo I., Loria D., Mazurek K., Pagano A., Papa M., Piasecki E., Porto F., Quinlann M., Rivet M.F., Rizzo F., Rosato E., Russotto P., Schroeder W.U., Spadaccini G., Trifirò A., Toke J., Trimarchi M., and Verde G.

Subjects
Physics, QC1-999
Abstract

Decay modes of excited compound systems 118Ba and 134Ba, produced respectively in the 78Kr+40Ca and 86Kr+48Ca collisions at 10 A·MeV, are investigated. In particular, the competition between the various disintegration path of medium mass compound nuclei, formed by fusion processes, the production of the so referred Intermediate Mass Fragments (IMF), and the isospin dependence of the decay process are studied. Data were taken at the INFN-Laboratori Nazionali del Sud (LNS) by using the CHIMERA array. Data analysis is in progress; a first indication on the average-energy angular distributions suggests pre-equilibrium effects affecting the data and the presence of isotopical effects.

Published
2014
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20. ISODEC Experiment: study and comparison of the decay mode of 78Kr+40Ca and 86Kr+48Ca systems at 10 AMeV

Author

Piasecki E., Papa M., Pagano A., Mazurek K., Loria D., Lombardo I., Le Neindre N., Lebhertz D., Lautesse P., Lanzalone G., La Guidara E., Henry E., Geraci E., Frankland J.D., D’Onofrio A., Colonna M., Chbihi A., Cardella G., Borderie B., Bonnet E., Berceanu I., Beck C., Auditore L., Amorini F., Vigilante M., De Filippo E., Ademard G., Wieleczko J.P., La Commara M., Politi G., Pirrone S., Porto F., Quinlann M., Rizzo F., Rosato E., Russotto P., Schroeder W.U., Spadaccini G., Trifirò A., Toke J., Trimarchi M., and Verde G.

Subjects
Physics, QC1-999
Abstract

We present the first results of the ISODEC experiment, performed at the INFN-LNS with the CHIMERA device, in order to study the competition between the various disintegration modes of 118,134Ba compound nuclei produced by bombarding 40,48Ca targets with beams of 78,86Kr at 10 AMeV. This work aims thus to explore the isospin dependence of the decay modes of medium mass compound nuclei formed by fusion processes. The experiment complements data already obtained at 5.5 MeV/A for 78,82Kr+40Ca reactions, studied by Ademard et al. with beams delivered by GANIL facility and by using the INDRA detector.

Published
2011
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23. Glutamate-system defects behind psychiatric manifestations in a familial hemiplegic migraine type 2 disease-mutation mouse model

Author

Bøttger, Pernille, Glerup, Simon, Gesslein, Bodil, Illarionova, Nina B, Isaksen, Toke J, Heuck, Anders, Clausen, Bettina H, Füchtbauer, Ernst-Martin, Gramsbergen, Jan B, Gunnarson, Eli, Aperia, Anita, Lauritzen, Martin, Lambertsen, Kate L, Nissen, Poul, Lykke-Hartmann, Karin, Bøttger, Pernille, Glerup, Simon, Gesslein, Bodil, Illarionova, Nina B, Isaksen, Toke J, Heuck, Anders, Clausen, Bettina H, Füchtbauer, Ernst-Martin, Gramsbergen, Jan B, Gunnarson, Eli, Aperia, Anita, Lauritzen, Martin, Lambertsen, Kate L, Nissen, Poul, and Lykke-Hartmann, Karin

Abstract

Migraine is a complex brain disorder, and understanding the complexity of this prevalent disease could improve quality of life for millions of people. Familial Hemiplegic Migraine type 2 (FHM2) is a subtype of migraine with aura and co-morbidities like epilepsy/seizures, cognitive impairments and psychiatric manifestations, such as obsessive-compulsive disorder (OCD). FHM2 disease-mutations locate to the ATP1A2 gene encoding the astrocyte-located α2-isoform of the sodium-potassium pump (α2Na(+)/K(+)-ATPase). We show that knock-in mice heterozygous for the FHM2-associated G301R-mutation (α2(+/G301R)) phenocopy several FHM2-relevant disease traits e.g., by mimicking mood depression and OCD. In vitro studies showed impaired glutamate uptake in hippocampal mixed astrocyte-neuron cultures from α2(G301R/G301R) E17 embryonic mice, and moreover, induction of cortical spreading depression (CSD) resulted in reduced recovery in α2(+/G301R) male mice. Moreover, NMDA-type glutamate receptor antagonists or progestin-only treatment reverted specific α2(+/G301R) behavioral phenotypes. Our findings demonstrate that studies of an in vivo relevant FHM2 disease knock-in mouse model provide a link between the female sex hormone cycle and the glutamate system and a link to co-morbid psychiatric manifestations of FHM2.

Published
2016

24. Decay competition in IMF production in the collisions Kr-78+Ca-40 and Kr-86+Ca-48 at 10 AMeV

Author

Pirrone, S, Politi, Giuseppe, La Commara, M, Wieleczko, Jp, De Filippo, E, Gnoffo, B, Ademard, G, Vigilante, M, Amorini, F, Auditore, Lucrezia, Beck, C, Berceanu, I, Bonnet, E, Borderie, B, Cardella, G, Chbihi, A, Colonna, M, D'Onofrio, A, Frankland, Jd, Geraci, E, Henry, E, Laguidara, E, Lanzalone, G, Lautesse, P, Lebhertz, D, Le Neindre, N, Lombardo, I, Mazurek, K, Pagano, Angelo, Papa, M, Piasecki, E, Quinlann, M, Rizzo, Francesca, Rosato, E, Russotto, P, Schroeder, Wu, Spadaccini, G, Trifiro, A, Toke, J, Trimarchi, M, and Verde, G.

Published
2014

26. Glutamate-system defects behind psychiatric manifestations in a familial hemiplegic migraine type 2 disease-mutation mouse model

Author

Bøttger, Pernille, primary, Glerup, Simon, additional, Gesslein, Bodil, additional, Illarionova, Nina B., additional, Isaksen, Toke J., additional, Heuck, Anders, additional, Clausen, Bettina H., additional, Füchtbauer, Ernst-Martin, additional, Gramsbergen, Jan B., additional, Gunnarson, Eli, additional, Aperia, Anita, additional, Lauritzen, Martin, additional, Lambertsen, Kate L., additional, Nissen, Poul, additional, and Lykke-Hartmann, Karin, additional

Published
2016
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27. Isospin influence on the decay modes of compound systems produced in the78,86Kr +40,48Ca at 10 AMeV

Author

Pirrone, S., primary, Politi, G., additional, Wieleczko, J.P., additional, De Filippo, E., additional, Gnoffo, B., additional, Russotto, P., additional, Trimarchi, M., additional, La Commara, M., additional, Vigilante, M., additional, Ademard, G., additional, Amorini, F., additional, Auditore, L., additional, Beck, C., additional, Berceanu, I., additional, Bonnet, E., additional, Borderie, B., additional, Cardella, G., additional, Chibihi, A., additional, Colonna, M., additional, D’Onofrio, A., additional, Frankland, J. D., additional, Geraci, E., additional, Henry, E., additional, La Guidara, E., additional, Lanzalone, G., additional, Lautesse, P., additional, Lebhertz, D., additional, Le Neindre, N., additional, Lombardo, I., additional, Mazurek, K., additional, Norella, S., additional, Pagano, A., additional, Pagano, E.V., additional, Papa, M., additional, Piasecki, E., additional, Porto, F., additional, Quattrocchi, L., additional, Quinlann, M., additional, Rizzo, F., additional, Schroeder, W. U., additional, Spadaccini, G., additional, Trifirò, A., additional, Toke, J., additional, and Verde, G., additional

Published
2016
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28. Isospin influence on the decay modes of the systems produced in the78,86Kr +40,48Ca reactions at 10 AMeV

Author

Gnoffo, B., primary, Pirrone, S., additional, Politi, G., additional, La Commara, M., additional, Wieleczko, J.P., additional, De Filippo, E., additional, Russotto, P., additional, Trimarchi, M., additional, Vigilante, M., additional, Ademard, G., additional, Amorini, F., additional, Auditore, L., additional, Beck, C., additional, Bercenau, I., additional, Bonnet, E., additional, Borderie, B., additional, Cardella, G., additional, Chibihi, A., additional, Colonna, M., additional, D’Onofrio, A., additional, Frankland, J.D., additional, Geraci, E., additional, Henry, E., additional, La Guidara, E., additional, Lanzalone, G., additional, Lautesse, P., additional, Lebhertz, D., additional, LeNeidre, N., additional, Lombardo, I., additional, Mazurek, K., additional, Norella, S., additional, Pagano, A., additional, Pagano, E.V., additional, Papa, M., additional, Piasecki, E., additional, Porto, F., additional, Quattrocchi, L., additional, Quinlann, M., additional, Rizzo, F., additional, Shoroeder, U., additional, Spadaccini, G., additional, Trifirò, A., additional, Toke, J., additional, and Verde, G., additional

Published
2016
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29. Study and comparison of the decay modes of the systems formed in the reactions Kr-78+Ca-40 and Kr-86+Ca-48 at 10 AMeV

Author

Politi, G, Pirrone, S, La Commara, M, Wieleczko, Jp, Ademard, G, De Filippo, E, Vigilante, M, Amorini, F, Auditore, L, Beck, C, Berceanu, I, Bonnet, E, Borderie, B, Cardella, G, Chbihi, A, Colonna, M, D'Onofrio, A, Frankland, Jd, Geraci, E, Henry, E, Laguidara, E, Lanzalone, G, Lautesse, P, Lebhertz, D, Leneindre, N, Lombardo, I, Loria, D, Mazurek, K, Pagano, A, Papa, M, Piasecki, E, Porto, F, Quinlann, M, Rizzo, F, Rosato, E, Russotto, P, Schroeder, Wu, Spadaccini, G, Trifiro, A, Toke, J, Trimarchi, M, and Verde, G

Published
2012

30. A modular NIM electronics for Pulse Shape method with the large area n-planar silicon detectors of the 4 pi CHIMERA

Author

Bassini, R, Boiano, C, Pagano, A, Amorini, F, Anzalone, A, Auditore, L, Cardella, G, Cavallaro, S, Chatterjee, Mb, D’Andrea, M, De Filippo, E, Giudice, N, Grimaldi, A, Guazzoni, P, La Guidara, E, Lanzano, G, Lanzalone, G, Maiolino, C, Nicotra, D, Papa, M, Pirrone, S, Politi, G, Porto, F, Pullia, F, Russo, S, Russotto, P, Sacca, G, Sassi, M, Stiro, Mario, Schroder, Wu, Trifiro, A, Toke, J, Trimarchi, M, Urso, S, Zetta, L, Giustolisi, Francesco, and Guardone, N

Subjects
Physics, Silicon, Physics::Instrumentation and Detectors, business.industry, Detector, chemistry.chemical_element, Signal, Time of flight, Nuclear magnetic resonance, Optics, Planar, chemistry, Nuclear electronics, Rise time, business, Energy (signal processing)
Abstract

A new modular NIM electronics has been developed for pulse shape discrimination (PSD) of the signals produced in silicon (Si) detectors. The main purpose in design the module was the possibility to achieve Z-identification of light nuclear fragments (Z < 15) which are stopped in the active region of a silicon detector, with a charge resolution as good as that one commonly obtained with an energy loss ΔE - E method requiring a two-stage telescopes. In the present study, a simple PSD method based on the rise time measurement of the charge signal is proposed. The method was developed for the silicon detectors of the 4π array CHIMERA and, consequently, it was implemented in a compact NIM module. This implementation allows for charge discrimination of fragments with charge Z < 15 and energy threshold as low as 4.5 MeV/nucleon (for Z = 6). This result is the natural follow on of a previous work recently done for the large area planar silicon detectors of CHIMERA, where the silicon detectors were used in both direct and reverse injection. The good performance of the constant fraction discrimination (CFD) required to trigger a start signal allowed to use this signal for time of flight (TOF) methods.

Published
2007

31. Present and future activity with CHIMERA 4p detector

Author

Cardella, G., Agodi, C., Amorini, F., Anzalone, A., Arena, N., Auditore, L., Barna, R., Benisz, A., Berceanu, I., Cavallaro, S., DE FILIPPO, E., Emanuele, U., Gawlikowicz, W., Grassi, L., Giuliani, G., Giustolisi, F., Grzeszczuk, A., Guazzoni, P., Kowalski, S., LA GUIDARA, E., Lanzalone, G., Lombardo, I., LO NIGRO, S., Loria, D., Maiolino, C., Nicolis, N. G., Pagano, A., Papa, M., Pawelczak, I., Petrovici, M., Piasecki, E., Pirrone, S., Planeta, R., Politi, Giuseppe, Pop, A., Porto, F., Previdi, F., Quinlan, M., Rizzo, Francesca, Rosato, E., Russotto, P., Schroder, U., Schmidt, K., Sipala, K. SIWEK WILCZYNSKA V., SKWIRA CHALOT, I., Sperduto, M. L., Sochocka, A., Stiro, M., Swiderski, L., Trifiro, A., Trimarchi, M., Toke, J., Verde, G., Vigilante, M., Wilczynski, J., Zetta, L., and Zipper, W.

Published
2007

32. Upgrading the CHIMERA detector: State of the art and perspectives

Author

Politi, G., Alderighi, M., Amorini, F., Anzalone, A., Arena, N., Auditore, Lucrezia, Bassini, R., Boiano, C., Cardella, G., Cavallaro, S., Chatterjee, M. B., D’Andrea, M., De Filippo, E., Fichera, F., Geraci, E., Giustolisi, F., Guardone, N., Grimaldi, A., Guazzoni, P., La Guidara, E., Lanzalone, G., Lanzanò, G., Maiolino, C., Nicotra, D., Pagano, A., Papa, M., Pirrone, S., Porto, F., Pullia, A., Rizzo, F., Russo, S., Russotto, P., Santonocito, D., Saccà, G., Sassi, M., Schroder, W. U., Sechi, G., Trifiro', Antonio, Toke, J., Trimarchi, Marina, Urso and, S., and Zetta, L.

Published
2006

33. Proposal for upgrading CHIMERA 4pi detector

Author

Pagano, A., Alderighi, M., Amorini, F., Anzalone, A., Arena, N., Auditore, L., Barn, R., Bassini, R., Blicharska, J., Boiano, C., Cal, C., Campagna, V., Cardella, G., Cavallaro, S., Chatterjee, M. B., Dandrea, M., DE FILIPPO, E., DE PASQUALE, D., DI STEFANO, A., Fichera, F., Geraci, Elena Irene, Giudice, N., Giustolisi, F., Grzeszczuk, A., Guardone, N., Grimaldi, A., Guazzoni, P., LA GUIDARA, E., Lanzan, G., Lanzalone, G., Nicotra, D., Papa, M., Pirrone, S., Politi, Giuseppe, Porto, F, Rapicavoli, C., Rosato, E., Rizzo, Francesca, Rizza, G., Russo, S., Russotto, P., Salamone, S., Sacc, G., Sassi, M., Schrder, W. U., Sechi, G., Trifir, A., Toke, J., Trimarchi, M., Urso, S., Vigilante, M., Zipper, W., and Zetta, AND L.

Published
2005

34. Decay competition in IMF production in the collisions 78Kr+40Ca and 86Kr+48Ca at 10 AMeV

Author

Pirrone, S, primary, Politi, G, additional, Commara, M La, additional, Wieleczko, J P, additional, Filippo, E De, additional, Gnoffo, B, additional, Ademard, G, additional, Vigilante, M, additional, Amorini, F, additional, Auditore, L, additional, Beck, C, additional, Berceanu, I, additional, Bonnet, E, additional, Borderie, B, additional, Cardella, G, additional, Chbihi, A, additional, Colonna, M, additional, D'Onofrio, A, additional, Frankland, J D, additional, Geraci, E, additional, Henry, E, additional, Laguidara, E, additional, Lanzalone, G, additional, Lautesse, P, additional, Lebhertz, D, additional, Neindre, N Le, additional, Lombardo, I, additional, Mazurek, K, additional, Pagano, A, additional, Papa, M, additional, Piasecki, E, additional, Quinlann, M, additional, Rizzo, F, additional, Rosato, E, additional, Russotto, P, additional, Schroeder, W U, additional, Spadaccini, G, additional, Trifirò, A, additional, Toke, J, additional, Trimarchi, M, additional, and Verde, G, additional

Published
2014
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35. Decay competition for IMF produced in the collisions78Kr+40Ca and86Kr+48Ca at 10 A·MeV

Author

La Commara, M., primary, Pirrone, S., additional, Politi, G., additional, Wieleczko, J.P., additional, Ademard, G., additional, De Filippo, E., additional, Vigilante, M., additional, Amorini, F., additional, Auditore, L., additional, Beck, C., additional, Berceanu, I., additional, Bonnet, E., additional, Borderie, B., additional, Cardella, G., additional, Chbihi, A., additional, Colonna, M., additional, Frankland, J.D., additional, Geraci, E., additional, Henry, E., additional, La Guidara, E., additional, Lanzalone, G., additional, Lautesse, P., additional, Lebhertz, D., additional, Le Neindre, N., additional, Lombardo, I., additional, Loria, D., additional, Mazurek, K., additional, Pagano, A., additional, Papa, M., additional, Piasecki, E., additional, Porto, F., additional, Quinlann, M., additional, Rivet, M.F., additional, Rizzo, F., additional, Rosato, E., additional, Russotto, P., additional, Schroeder, W.U., additional, Spadaccini, G., additional, Trifirò, A., additional, Toke, J., additional, Trimarchi, M., additional, and Verde, G., additional

Published
2014
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36. Insights into the Pathology of the α2-Na+/K+-ATPase in Neurological Disorders; Lessons from Animal Models.

Author

Isaksen, Toke J. and Lykke-Hartmann, Karin

Subjects
ADENOSINE triphosphatase, NEUROLOGICAL disorders, CATALYTIC activity, CENTRAL nervous system, ANIMAL models in research
Abstract

A functional Na+/K+-ATPase consists of α catalytic a subunit and a regulatory β subunit. Four α isoforms of the Na+/K+-ATPase are found in mammals, each with a unique expression pattern and catalytic activity. The α2 isoform, encoded by the ATP1A2 gene, is primarily found in the central nervous system (CNS) and in heart-, skeletal- and smooth muscle tissues. In the CNS, the α2 isoform is mainly expressed in glial cells. In particular, the α2 isoform is found in astrocytes, important for astrocytic K+ clearance and, consequently, the indirect uptake of neurotransmitters. Both processes are essential for proper brain activity, and autosomal dominantly mutations in the ATP1A2 gene cause the neurological disorder Familial hemiplegic migraine type 2 (FHM2). FHM2 is a severe subtype of migraine with aura including temporary numbness or weakness, and affecting only one side of the body. FHM2 patients often suffer from neurological comorbidities such as seizures, sensory disturbances, cognitive impairment, and psychiatric manifestations. The functional consequences of FHM2 disease mutations leads to a partial or complete loss of function of pump activity; however, a clear phenotype-genotype correlation has yet to be elucidated. Gene-modified mouse models targeting the Atp1a2 gene have proved instrumental in the understanding of the pathology of FHM2. Several Atp1a2 knockout (KO) mice targeting different exons have been reported. Homozygous Atp1a2 KO mice die shortly after birth due to respiratory malfunction resulting from abnormal Cl- homeostasis in brainstem neurons. Heterozygous KO mice are viable, but display altered behavior and neurological deficits such as altered spatial learning, decreased motor activity and enhanced fear/anxiety compared to wild type mice. FHM2 knock-in (KI) mouse models carrying the human in vivo disease mutations W887R and G301R have also been reported. Both models display altered cortical spreading depression (CSD) and point to deficits in the glutamatergic system as the main underlying mechanism of FHM2. [ABSTRACT FROM AUTHOR]

Published
2016
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37. ISODEC Experiment: study and comparison of the decay mode of78Kr+40Ca and86Kr+48Ca systems at 10 AMeV

Author

Pirrone, S., primary, Politi, G., additional, La Commara, M., additional, Wieleczko, J.P., additional, Ademard, G., additional, De Filippo, E., additional, Vigilante, M., additional, Amorini, F., additional, Auditore, L., additional, Beck, C., additional, Berceanu, I., additional, Bonnet, E., additional, Borderie, B., additional, Cardella, G., additional, Chbihi, A., additional, Colonna, M., additional, D’Onofrio, A., additional, Frankland, J.D., additional, Geraci, E., additional, Henry, E., additional, La Guidara, E., additional, Lanzalone, G., additional, Lautesse, P., additional, Lebhertz, D., additional, Le Neindre, N., additional, Lombardo, I., additional, Loria, D., additional, Mazurek, K., additional, Pagano, A., additional, Papa, M., additional, Piasecki, E., additional, Porto, F., additional, Quinlann, M., additional, Rizzo, F., additional, Rosato, E., additional, Russotto, P., additional, Schroeder, W.U., additional, Spadaccini, G., additional, Trifirò, A., additional, Toke, J., additional, Trimarchi, M., additional, and Verde, G., additional

Published
2011
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38. Heavy residues and intermediate-mass fragment production in dissipative Au-197+Kr-86 collisions at E/A=35 MeV

Author

Djerroud, B, Agnihotri, DK, Baldwin, SP, Skulski, W, Toke, J, Schroder, WU, Charity, RJ, Dempsey, JF, Sarantites, DG, Sobotka, LG, Lott, B, Loveland, W, Aleklett, K, Djerroud, B, Agnihotri, DK, Baldwin, SP, Skulski, W, Toke, J, Schroder, WU, Charity, RJ, Dempsey, JF, Sarantites, DG, Sobotka, LG, Lott, B, Loveland, W, and Aleklett, K

Abstract

Neutrons and charged light and intermediate-mass products from the Au-197 + Kr-86 reaction at E-lab/A = 35 MeV were measured with 4 pi angular coverage, in coincidence with projectilelike (PLFs) and targetlike fragments (TLFs). The characteristics of PLF, Addresses: Djerroud B, McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada Univ Rochester, Dept Chem, Rochester, NY 14627 USA Washington Univ, Dept Chem, St Louis, MO 63130 USA Lab Natl GANIL, F-14021 Caen, France Oregon State Univ, Corvallis

Published
2001

39. Origin of slow, heavy residues observed in dissipative Au-197+Kr-86 collisions at E/A=35MeV

Author

Skulski, W, Djerroud, B, Agnihotri, DK, Baldwin, SP, Toke, J, Zhao, X, Schroder, WU, Sobotka, LG, Charity, RJ, Dempsey, J, Sarantites, DG, Lott, B, Loveland, W, Aleklett, Kjell, Skulski, W, Djerroud, B, Agnihotri, DK, Baldwin, SP, Toke, J, Zhao, X, Schroder, WU, Sobotka, LG, Charity, RJ, Dempsey, J, Sarantites, DG, Lott, B, Loveland, W, and Aleklett, Kjell

Abstract

An exclusive measurement of slow, massive residues from the Au-197 + Kr-86 reaction at E/A = 35 MeV has been performed in coincidence with projectile-like fragments, neutrons, as well as light- and intermediate-mass charged products. The highly efficient, Addresses: Skulski W, UNIV ROCHESTER, DEPT CHEM, ROCHESTER, NY 14627. UNIV ROCHESTER, NSRL, ROCHESTER, NY 14627. WASHINGTON UNIV, DEPT CHEM, ST LOUIS, MO 63130. GANIL, IN2P3, CNRS, DSM, CEA, F-14021 CAEN, FRANCE. OREGON STATE UNIV, DEPT CHEM, CORVALLIS, O

Published
1996

40. Semi-Supervised Eigenvectors for Large-Scale Locally-Biased Learning.

Author

Hansen, Toke J. and Mahoney, Michael W.

Subjects
*EIGENVECTORS, *SUPERVISED learning, *INFORMATION theory, *GRAPH theory, *DATA analysis
Abstract

In many applications, one has side information, e.g., labels that are provided in a semisupervised manner, about a specific target region of a large data set, and one wants to perform machine learning and data analysis tasks "nearby" that prespecified target region. For example, one might be interested in the clustering structure of a data graph near a prespecified "seed set" of nodes, or one might be interested in finding partitions in an image that are near a prespecified "ground truth" set of pixels. Locally-biased problems of this sort are particularly challenging for popular eigenvector-based machine learning and data analysis tools. At root, the reason is that eigenvectors are inherently global quantities, thus limiting the applicability of eigenvector-based methods in situations where one is interested in very local properties of the data. In this paper, we address this issue by providing a methodology to construct semi-supervised eigenvectors of a graph Laplacian, and we illustrate how these locally-biased eigenvectors can be used to perform locally-biased machine learning. These semi-supervised eigenvectors capture successively-orthogonalized directions of maximum variance, conditioned on being well-correlated with an input seed set of nodes that is assumed to be provided in a semi-supervised manner. We show that these semi-supervised eigenvectors can be computed quickly as the solution to a system of linear equations; and we also describe several variants of our basic method that have improved scaling properties. We provide several empirical examples demonstrating how these semi-supervised eigenvectors can be used to perform locally-biased learning; and we discuss the relationship between our results and recent machine learning algorithms that use global eigenvectors of the graph Laplacian. [ABSTRACT FROM AUTHOR]

Published
2014

42. Isospin influence on the decay modes of the systems produced in the 78,86Kr +40,48Ca reactions at 10 AMeV

Author

Giuseppe Verde, S. Pirrone, Maria Colonna, M. Trimarchi, K. Mazurek, E. Geraci, G. Ademard, B. Borderie, D. Lebhertz, N. Leneidre, Ivano Lombardo, J.P. Wieleczko, G. Lanzalone, E. Piasecki, A. Pagano, U. Shoroeder, A. Chibihi, P. Lautesse, C. Beck, P. Russotto, B. Gnoffo, E. V. Pagano, F. Porto, Lucrezia Auditore, E. De Filippo, Eric Bonnet, S. Norella, Michele Papa, Jan Toke, G. Politi, Mariano Vigilante, F. Rizzo, F. Amorini, Antonio D'Onofrio, G. Cardella, E. La Guidara, J.D. Frankland, M. La Commara, E. Henry, G. Spadaccini, M. Quinlann, Antonio Trifiro, L. Quattrocchi, I. Bercenau, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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 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)-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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Greco, V., Gnoffo, B., Pirrone, S., Politi, G., La Commara, M., Wieleczko, J. P., De Filippo, E., Russotto, P., Trimarchi, M., Vigilante, M., Ademard, G., Amorini, F., Auditore, L., Beck, C., Bercenau, I., Bonnet, E., Borderie, B., Cardella, G., Chibihi, A., Colonna, M., D'Onofrio, A., Frankland, J. D., Geraci, E., Henry, E., La Guidara, E., Lanzalone, G., Lautesse, P., Lebhertz, D., Leneidre, N., Lombardo, I., Mazurek, K., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Piasecki, E., Porto, F., Quattrocchi, L., Quinlann, M., Rizzo, F., Shoroeder, U., Spadaccini, G., Trifirò, A., Toke, J., and Verde, G.

Subjects
Physics, Reaction mechanism, 010308 nuclear & particles physics, Fission, QC1-999, Relaxation (NMR), Cyclotron, Charge (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Isotopic composition, law.invention, Nuclear physics, Viscosity, Physics and Astronomy (all), law, Isospin, 0103 physical sciences, Atomic physics, 010306 general physics
Abstract

International audience; The results of the analysis of the reactions 78,86Kr +40,48 Ca at 10 AMeV are presented. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) in Catania by using the 4π multidetector CHIMERA, with beams delivered by the Superconductive Cyclotron. The competition among the various disintegration paths and in particular the isospin effects on the decay modes of the produced composite systems are investigated; this provides information about fundamental nuclear quantities such as level density, fission barrier and viscosity. Different isotopic composition and relative richness are observed among the reaction products of the two systems. An odd-even staggering effect is present in the charge distributions, in particular for the light fragments produced by the neutron-poor system. The kinematical characteristics of the IMF seem to indicate a high degree of the relaxation of the formed system. Besides, global features analysis seems to show some differences in the contribution arising from the various reaction mechanisms for the two reactions.

Published
2016

43. Isospin influence on the decay modes of compound systems produced in the $^{78,86}$Kr + $^{40,48}$Ca at 10 AMeV

Author

E. V. Pagano, Maria Colonna, B. Borderie, Jan Toke, P. Lautesse, S. Norella, W. U. Schroeder, E. De Filippo, Ivano Lombardo, J.P. Wieleczko, P. Russotto, B. Gnoffo, E. Geraci, E. Piasecki, A. Chibihi, Giuseppe Verde, Mariano Vigilante, A. Pagano, E. La Guidara, G. Lanzalone, C. Beck, Michele Papa, F. Amorini, S. Pirrone, Marina Trimarchi, K. Mazurek, G. Spadaccini, F. Rizzo, J.D. Frankland, Eric Bonnet, G. Ademard, Antonio D'Onofrio, D. Lebhertz, Lucrezia Auditore, N. Le Neindre, G. Politi, F. Porto, G. Cardella, I. Berceanu, M. La Commara, M. Quinlann, Antonio Trifiro, L. Quattrocchi, E. Henry, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), 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), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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 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), 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), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Kawano, T., Pirrone, S., Politi, G., Wieleczko, J. P., De Filippo, E., Gnoffo, B., Russotto, P., Trimarchi, M., La Commara, M., Vigilante, M., Ademard, G., Amorini, F., Auditore, L., Beck, C., Berceanu, I., Bonnet, E., Borderie, B., Cardella, G., Chibihi, A., Colonna, M., D'Onofrio, A., Frankland, J. D., Geraci, E., Henry, E., La Guidara, E., Lanzalone, G., Lautesse, P., Lebhertz, D., Le Neindre, N., Lombardo, I., Mazurek, K., Norella, S., Pagano, A., Pagano, E. V., Papa, M., Piasecki, E., Porto, F., Quattrocchi, L., Quinlann, M., Rizzo, F., Schroeder, W. U., Spadaccini, G., Trifiro, A., Toke, J., and Verde, G.

Subjects
Physics, Compound Nuclei, 010308 nuclear & particles physics, QC1-999, Charge (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Entrance channel, Nuclear physics, Physics and Astronomy (all), Isospin, 0103 physical sciences, Compund Nucleus, Fusion reactions, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

International audience; The study of the decay modes competition of the compound systems produced in thecollisions 78Kr+40Ca and 86Kr+48Ca at 10AMeV is presented. In particular, the N/Z entrance channelinfluence on the decay paths of the compound systems, directly connected to the isospin influence, isinvestigated. The experiment was performed at the INFN Laboratori Nazionali del Sud (LNS) inCatania by using the 4π multi-detector CHIMERA. Charge, mass, angular distributions andkinematical features of the reaction products were studied. The analysis shows some differences in thecontribution arising from the various reaction mechanisms for the neutron poor and neutron richsystems. Comparison with theoretical statistical and dynamical models are presented for the twosystems. Besides a study of the influence of the energy on the entrance channel is performed for the78Kr+40Ca reaction, by comparing the results of this experiment to those obtained for the same systemat 5.5 AMeV with the INDRA device at GANIL.

Published
2015

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