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116 results on '"Harissopulos, S."'

3. Activation Cross Section Measurement of the (n,2n) Reaction on 203Tl

Author

Diakaki Μ., Vlastou R., Patas S., Chasapoglou S., Kokkoris M., Alamanos G., Frantzis C., Axiotis M., Harissopulos S., and Lagoyannis A.

Subjects
Physics, QC1-999
Abstract

The aim of the present work was to study the cross-section of the (n,2n) reaction on 203Tl, by irradiating a natural TlCl pellet target with monoenergetic neutron beams at 16.4, 18.9 and 19.3 MeV. The cross section of the 203Tl(n,2n)202Tl reaction was measured via the activation method, with respect to the 197Au(n,2n)196Au and 27Al(n,α)24Na reference reactions. At the same time, the 203Tl(n,3n)201Tl was also measured at 18.9 and 19.3 MeV. The monoenergetic neutron beams were generated at the 5.5 MV Tandem accelerator of NCSR “Demokritos”, using the 3H(d,n)4He reaction. In addition, theoretical calculations with the EMPIRE code have been performed, in order to find a suitable model for the description of the experimental data of the present work along with the data from literature.

Published
2023
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4. Cross Section Measurements and Theoretical Study of the 174,176Hf(n,2n)173,175Hf Reactions

Author

Vlastou R., Kalamara A., Serris M., Chasapoglou S., Frantzis C., Tsivouraki E., Kokkoris M., Krokidi K., Axiotis M., Harissopulos S., and Lagoyannis A.

Subjects
Physics, QC1-999
Abstract

Experimental cross section measurements for the 176Hf(n,2n)175Hf and 174Hf(n,2n)173Hf reactions were carried out, using the activation technique. The neutron beam energy in the range of 15.3-20.3 MeV was produced via the 3H(d,n)4He reaction at the 5.5 MeV Tandem Van de Graaf accelerator laboratory of NCSR “Demokritos”. A thin metallic foil of natural Hf was used, while for the determination of the neutron flux at the target position, reference foils of Al were placed at the front and back of the Hf target. The irradiations were continuous for ~24-48 hours, leading to a total neutron fluence of 1010-1011 n/cm2 and a BF3 detector was used for monitoring the neutron flux during the irradiations. After the end of each irradiation, the activity of the Hf target and the Al reference foils were measured off-line by two HPGe detectors. The 176Hf(n,2n)175Hf reaction has been corrected for the contribution of the 177Hf(n,3n)175Hf and 174Hf(n,γ)175Hf reactions. Statistical model calculations based on the Hauser-Feshbach theory have also been performed using the EMPIRE 3.2.3 code. The predictions have been compared with the data of the present work as well as with data from literature.

Published
2023
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14. Intrinsic limits on resolutions in muon- and electron-neutrino charged-current events in the KM3NeT/ORCA detector

Author

Adrián-Martínez, S., Ageron, M., Aiello, S., Albert, A., Ameli, F., Anassontzis, E. G., Andre, M., Androulakis, G., Anghinolfi, M., Anton, G., Ardid, M., Avgitas, T., Barbarino, G., Barbarito, E., Baret, B., Barrios-Mart, J., Belias, A., Berbee, E., van den Berg, A., Bertin, V., Beurthey, S., van Beveren, V., Beverini, N., Biagi, S., Biagioni, A., Billault, M., Bondì, M., Bormuth, R., Bouhadef, B., Bourlis, G., Bourret, S., Boutonnet, C., Bouwhuis, M., Bozza, C., Bruijn, R., Brunner, J., Buis, E., Buompane, R., Busto, J., Cacopardo, G., Caillat, L., Calamai, M., Calvo, D., Capone, A., Caramete, L., Cecchini, S., Celli, S., Champion, C., Cherubini, S., Chiarella, V., Chiarelli, L., Chiarusi, T., Circella, M., Classen, L., Cobas, D., Cocimano, R., Coelho, J. A. B., Coleiro, A., Colonges, S., Coniglione, R., Cordelli, M., Cosquer, A., Coyle, P., Creusot, A., Cuttone, G., D’Amato, C., D’Amico, A., D’Onofrio, A., De Bonis, G., De Sio, C., Di Palma, I., Díaz, A. F., Distefano, C., Donzaud, C., Dornic, D., Dorosti-Hasankiadeh, Q., Drakopoulou, E., Drouhin, D., Durocher, M., Eberl, T., Eichie, S., van Eijk, D., El Bojaddaini, I., Elsaesser, D., Enzenhöfer, A., Favaro, M., Fermani, P., Ferrara, G., Frascadore, G., Furini, M., Fusco, L. A., Gal, T., Galatà, S., Garufi, F., Gay, P., Gebyehu, M., Giacomini, F., Gialanella, L., Giordano, V., Gizani, N., Gracia, R., Graf, K., Grégoire, T., Grella, G., Grmek, A., Guerzoni, M., Habel, R., Hallmann, S., van Haren, H., Harissopulos, S., Heid, T., Heijboer, A., Heine, E., Henry, S., Hernández-Rey, J. J., Hevinga, M., Hofestädt, J., Hugon, C. M. F., Illuminati, G., James, C. W., Jansweijerf, P., Jongen, M., de Jong, M., Kadler, M., Kalekin, O., Kappes, A., Katz, U. F., Keller, P., Kieft, G., Kießling, D., Koffeman, E. N., Kooijman, P., Kouchner, A., Kreter, M., Kulikovskiy, V., Lahmann, R., Lamare, P., Larosa, G., Leisos, A., Leone, F., Leonora, E., Lindsey Clark, M., Liolios, A., Llorens Alvarez, C. D., Lo Presti, D., Löhner, H., Lonardo, A., Lotze, M., Loucatos, S., Maccioni, E., Mannheim, K., Manzali, M., Margiotta, A., Margotti, A., Marinelli, A., Maris, O., Markou, C., Martínez-Mora, J. A., Martini, A., Marzaioli, F., Mele, R., Melis, K. W., Michael, T., Migliozzi, P., Migneco, E., Mijakowski, P., Miraglia, A., Mollo, C. M., Mongelli, M., Morganti, M., Moussa, A., Musico, P., Musumeci, M., Navas, S., Nicolau, C. A., Olcina, I., Olivetto, C., Orlando, A., Orzelli, A., Pancaldi, G., Papaikonomou, A., Papaleo, R., Păvălas, G. E., Peek, H., Pellegrini, G., Pellegrino, C., Perrina, C., Pfutzner, M., Piattelli, P., Pikounis, K., Pleinert, M.-O., Poma, G. E., Popa, V., Pradier, T., Pratolongo, F., Pühlhofer, G., Pulvirenti, S., Quinn, L., Racca, C., Raffaelli, F., Randazzo, N., Rauch, T., Real, D., Resvanis, L., Reubelt, J., Riccobene, G., Rossi, C., Rovelli, A., Saldaña, M., Salvadori, I., Samtleben, D. F. E., Sánchez García, A., Sánchez Losa, A., Sanguineti, M., Santangelo, A., Santonocito, D., Sapienza, P., Schimmel, F., Schmelling, J., Schnabel, J., Sciacca, V., Sedita, M., Seitz, T., Sgura, I., Simeone, F., Sipala, V., Spisso, B., Spurio, M., Stavropoulos, G., Steijger, J., Stellacci, S. M., Stransky, D., Taiuti, M., Tayalati, Y., Terrasi, F., Tézier, D., Theraube, S., Timmer, P., Tönnis, C., Trasatti, L., Travaglini, R., Trovato, A., Tsirigotis, A., Tzamarias, S., Tzamariudaki, E., Vallage, B., Van Elewyck, V., Vermeulen, J., Versari, F., Vicini, P., Viola, S., Vivolo, D., Volkert, M., Wiggers, L., Wilms, J., de Wolf, E., Zachariadou, K., Zani, S., Zornoza, J. D., Zúñiga, J., and The KM3NeT collaboration

Published
2017
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16. A new recoil distance technique using low energy coulomb excitation in inverse kinematics

Author

Rother, W., Dewald, A., Pascovici, G., Fransen, C., Frießner, G., Hackstein, M., Ilie, G., Iwasaki, H., Jolie, J., Melon, B., Petkov, P., Pfeiffer, M., Pissulla, Th., Zell, K.-O., Jakobsson, U., Julin, R., Jones, P., Ketelhut, S., Nieminen, P., Peura, P., Rahkila, P., Uusitalo, J., Scholey, C., Harissopulos, S., Lagoyannis, A., Konstantinopoulos, T., Grahn, T., and Balabanski, D.

Published
2011
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22. 6,7Li + 28Si total reaction cross sections at near barrier energies

Author

Pakou, A., Musumarra, A., Pierroutsakou, D., Alamanos, N., Assimakopoulos, P.A., Divis, N., Doukelis, G., Gillibert, A., Harissopulos, S., Kalyva, G., Kokkoris, M., Lagoyannis, A., Mertzimekis, T.J., Nicolis, N.G., Papachristodoulou, C., Perdikakis, G., Roubos, D., Rusek, K., Spyrou, S., and Zarkadas, Ch.

Published
2007
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27. Beta decay of 93Pd

Author

Schmidt, K., Mazzocchi, C., Borcea, R., Döring, J., Galanopoulos, S., Górska, M., Grawe, H., Harissopulos, S., Hellström, M., Janas, Z., Kirchner, R., Kriembardis, G., La Commara, M., Ostrowski, A. N., Rainovski, G., and Roeckl, E.

Published
2000
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31. E1 and E2 capture cross section and astrophysical reaction rate of the key reaction 12C( α, γ) 16O

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assunção, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotić, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., and Szilner, S.

Published
2005
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32. New determination of the 12C( α, γ) 16O reaction rate from γ-ray angular distribution measurements

Author

Hammer, J.W., Fey, M., Kunz, R., Kiener, J., Tatischeff, V., Haas, F., Weil, J.L., Assunção, M., Beck, C., Boukari-Pelissie, C., Coc, A., Correia, J.J., Courtin, S., Fleurot, F., Galanopoulos, E., Grama, C., Hammache, F., Harissopulos, S., Korichi, A., Krmpotić, E., Le Du, D., Lopez-Martens, A., Malcherek, D., Meunier, R., Papka, P., Paradellis, T., Rousseau, M., Rowley, N., Staudt, G., and Szilner, S.

Published
2005
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34. High spin structures of 122Xe

Author

Serris, M., Papadopoulos, C. T., Vlastou, R., Kalfas, C. A., Kossionides, S., Fotiades, N., Harissopulos, S., Beausang, C. W., Joyce, M. J., Paul, E. S., Bentley, M. A., Araddad, S., Simpson, J., and Sharpey-Schafer, J. F.

Published
1997
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35. High spin structures in194Hg

Author

Fotiades, N., Harissopulos, S., Kalfas, C. A., Kossionides, S., Papadopoulos, C. T., Vlastou, R., Serris, M., Sharpey-Schafer, J. F., Joyce, M. J., Beausang, C. W., Dagnall, P. J., Forsyth, P. D., Gale, S. J., Jones, P. M., Paul, E. S., Twin, P. J., Simpson, J., Cullen, D. M., Fallon, P., Riley, M. A., Clark, R. M., Hauschild, K., and Wadsworth, R.

Published
1996
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36. Low-energy enhancement of nuclear γ strength and its impact on astrophysical reaction rates

Author

Larsen A. C., Blasi N., Bracco A., Bürger A., Camera F., Eriksen T.K., Giacoppo F., Goriely S., Guttormsen M., Görgen A., Hagen T. W., Harissopulos S., Koehler P. E., Leoni S., Million B., Nyhus H.T., Renstrøm T.T., Rose S., Ruud I.E., Schiller A., Siem S., Tornyi T., Tveten G. M., Voinov A. V., and Wiedeking M.

Subjects
Physics, QC1-999
Abstract

An unexpected enhancement in the low-energy part of the γ-strength function for light and medium-mass nuclei has been discovered at the Oslo Cyclotron Laboratory. This enhancement could lead to an increase in the neutron-capture rates up to two orders of magnitude for very exotic, neutron-rich nuclei. However, it is still an open question whether this structure persists when approaching the neutron drip line.

Published
2014
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39. Dipole structures in 122Xe

Author

Serris, M., Papadopoulos, C.T., Vlastou, R., Kalfas, C.A., Kossionides, S., Fotiades, N., Harissopulos, S., Beausang, C.W., Joyce, M.J., Paul, E.S., Bentley, M.A., Simpson, J., and Sharpey-Schafer, J.F.

Published
1997
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40. Do light nuclei display a universal γ-ray strength function?

Author

Voinov A., Norrby M., Schiller A., Krtička T., Lönnroth T., Kmiecik M., Mazurek K., Perdikakis G., Spyrou A., Lagoyannis A., Konstantinopoulos T., Tveten G.M., Harissopulos S., Syed N.U.H., Toft H.K., Nyhus H.T., Siem S., Bürger A., Görgen A., Guttormsen M., and Larsen A.C.

Subjects
Physics, QC1-999
Abstract

In this work we focus on properties in the quasi-continuum of light nuclei. Generally, both level density and γ-ray strength function (γ-SF) differ from nucleus to nucleus. In order to investigate this closer, we have performed particle-γ coincidences using the reactions (p, p'), (p, d) and (p, t) on a 46Ti target. In particular, the very rich data set of the 46Ti(p, p')46Ti inelastic scattering reaction allows analysis of the coincidence data for many independent data sets. Using the Oslo method, we find one common level density for all data sets. If transitions to well-separated low-energy levels are included, the deduced γ-SF may change by a factor of 2 – 3, due strong to Porter-Thomas fluctuations. However, a universal γ-SF with small fluctuations is found provided that only excitation energies above 3 MeV are taken into account. The nuclear structure of the titaniums is discussed within a combinatorial quasi-particle model, showing that only few Nilsson orbitals participate in building up the level density for these light nuclei.

Published
2012
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41. Level Densities and γ Strength Functions in Light Sc and Ti Isotopes

Author

Voinov A., Spyrou A., Siem S., Perdikakis G., Nyhus H., Norby M., Mazurek K., Lönnroth T., Lagoyannis A., Krtička M., Konstantinopoulos T., Kmiecik M., Harissopulos S., Guttormsen M., Syed N.U.H., Larsen A.C., and Bürger A.

Subjects
Physics, QC1-999
Abstract

We present preliminary results from a measurement of nuclear level densities and the γ-ray strength of light Sc and Ti isotopes using the Oslo Method.

Published
2010
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42. Beta decay of medium and high spin isomers in 94Ag

Author

La Commara, M., Schmidt, K., Grawe, H., Döring, J., Borcea, R., Galanopoulos, S., Górska, M., Harissopulos, S., Hellström, M., Janas, Z., Kirchner, R., Mazzocchi, C., Ostrowski, A.N., Plettner, C., Rainovski, G., and Roeckl, E.

Published
2002
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46. UPBEND AND M1 SCISSORS MODE IN NEUTRON-RICH NUCLEI -- CONSEQUENCES FOR r-PROCESS (n, γ) REACTION RATES.

Author

LARSEN, A. C., GORIELY, S., BERNSTEIN, L. A., BLEUEL, D. L., BRACCO, A., BROWN, B. A., CAMERA, F., ERIKSEN, T. K., FRAUENDORF, S., GIACOPPO, F., GUTTORMSEN, M., GÖRGEN, A., HARISSOPULOS, S., LEONI, S., LIDDICK, S. N., NAQVI, F., NYHUS, H. T., ROSE, S. J., RENSTRØM, T., and SCHWENGNER, R.

Subjects
ELECTRON emission, NUCLEAR energy levels, EXCITED states, NEUTRONS, EXCITATION energy (In situ microanalysis), NEUTRON capture, CHEMICAL kinetics
Abstract

An enhanced probability for low-energy γ-emission (upbend, Eγ <3 MeV) at high excitation energies has been observed for several light and medium-mass nuclei close to the valley of stability. Also the M1 scissors mode seen in deformed nuclei increases the γ-decay probability for low-energy γ-rays (Eγ ≈ 2-3 MeV). These phenomena, if present in neutron-rich nuclei, have the potential to increase radiative neutron-capture rates relevant for the r-process. The experimental and theoretical status of the upbend is discussed, and preliminary calculations of (n, γ ) reaction rates for neutronrich, mid-mass nuclei including the scissors mode are shown. [ABSTRACT FROM AUTHOR]

Published
2015
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47. Cross section measurements of proton capture reactions relevant to the p process: The case of 89Y(p, γ)90Zr and 121,123Sb(p, γ)122,124Te.

Author

Harissopulos, S., Spyrou, A., Lagoyannis, A., Axiotis, M., Demetriou, P., Hammer, J. W., Kunz, R., and Becker, H.-W.

Subjects
*PROTON capture, *ANGULAR distribution (Nuclear physics), *ANGULAR correlations (Nuclear physics), *NUCLEAR astrophysics research, *NUCLEAR reactions
Abstract

The cross sections of the 89Y(p, γ)90Zr and the 121,123Sb(p, γ)122,124Te reactions were determined from γ-angular distribution measurements at beam energies from 1.6 to 3.4 MeV. In addition, angle-integrated cross sections were also measured at Ep = 2, 3, 4, and 4.8 MeV for the 89Y(p, γ)90Zr reaction using the 4π γ-summing method. Astrophysical S factors and reaction rates were deduced from the measured cross sections. Statistical model calculations were performed using the nuclear-reaction code TALYS. The results from the comparison between theory and experiment are discussed in detail. [ABSTRACT FROM AUTHOR]

Published
2013
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48. Differential cross section measurements of the 32S(d,p)33S reaction for nuclear reaction analysis purposes

Author

Lagoyannis, A., Harissopulos, S., Misaelides, P., Provatas, G., Foteinou, V., and Kokkoris, M.

Subjects
*DIFFERENTIAL cross sections, *NUCLEAR reactions, *SULFUR, *DEUTERON reactions
Abstract

Abstract: Differential cross sections of the 32S(d,p0,1,2,3,4–6,7) reactions were determined for deuteron energies E lab =1975–2600keV (in steps of 25keV) and for detector angles between 140–170° in steps of 10°. A comparison of the experimental data with the existing ones and possible applications to nuclear reaction analysis (NRA) studies are discussed. [Copyright &y& Elsevier]

Published
2008
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50. The 27Al (p,γ)28Si reaction: direct capture cross-section and resonance strengths at Ep = 0.2-1.12 MeV.

Author

Harissopulos, S., Chronidou, C., Spyrou, K., Paradellis, T., Rolfs, C., Schulte, W.H., and Becker, H.W.

Abstract

The 27Al(p,γ)28Si reaction has been investigated using two different 4π NaI summing detectors. The strength of 26 resonances in the energy range from 200 to 1120 keV has been measured. In addition, yield measurements have been carried out at 9 beam energies in the 490 to 1150 keV range in order to determine the direct capture cross-section. The existing data on the non-resonant mechanism were analysed and combined with the results of the present work. The resulting resonance strengths as well as the deduced direct capture astrophysical S-factor are compared with previous work. [ABSTRACT FROM AUTHOR]

Published
2000
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