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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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12. 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
NUCLEAR cross sections, HAFNIUM isotopes, NUCLEAR activation analysis, NUCLEAR reactions, NEUTRON flux
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. [ABSTRACT FROM AUTHOR]

Published
2023
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15. 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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17. 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
NUCLEAR cross sections, NEUTRON beams, MONOENERGETIC radiation, NUCLEAR activation analysis, COLLISIONS (Nuclear physics)
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. [ABSTRACT FROM AUTHOR]

Published
2023
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18. 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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25. 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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30. 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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34. 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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35. 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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37. 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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38. 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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39. 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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42. 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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43. 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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44. Au 197 (n,2n) reaction cross section in the 15-21 MeV energy range

Author

Kalamara, A. Vlastou, R. Kokkoris, M. Nicolis, N.G. Patronis, N. Serris, M. Michalopoulou, V. Stamatopoulos, A. Lagoyannis, A. Harissopulos, S.

Abstract

The cross section of the Au197(n,2n)Au196 reaction has been determined at six energies ranging from 15.3-20.9 MeV by means of the activation technique, relative to the Al27(n,α)Na24 reaction. Quasimonoenergetic neutron beams were produced via the H3(d,n)He4 reaction at the 5.5 MV Tandem T11/25 accelerator laboratory of NCSR "Demokritos". After the irradiations, the induced γ-ray activity of the target and reference foils was measured with high-resolution HPGe detectors. The cross section for the high spin isomeric state (12-) was determined along with the sum of the ground (2-), the first (5+), and second (12-) isomeric states. Theoretical calculations were carried out with the codes empire 3.2.2 and talys 1.8. Optimum input parameters were chosen in such a way as to simultaneously reproduce several experimental reaction channel cross sections in a satisfactory way, namely the (n,elastic), (n,2n), (n,3n), (n,p), (n,α), and (n,total) ones. © 2018 American Physical Society.

Published
2018

45. 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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46. 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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49. Surface composition and structure of divertor tiles following the JET tokamak operation with the ITER-like wall

Author

Lagoyannis, A. Tsavalas, P. Mergia, K. Provatas, G. Triantou, K. Tsompopoulou, E. Rubel, M. Petersson, P. Widdowson, A. Harissopulos, S. Mertzimekis, T.J. JET contributors

Subjects
genetic structures, sense organs
Abstract

Samples extracted from several divertor tiles following the 2011-2012 operation of JET with the ITER-Like wall were analyzed using ion beam analysis methods, x-ray fluorescence spectroscopy, scanning electron microscopy with energy dispersive spectroscopy analysis and x-ray diffraction. The emphasis was on the determination of light species and on material mixing including compound formation on the bottom and the outer divertor tiles. Deposition of deuterium, beryllium, carbon, nitrogen, oxygen, iron, chromium, nickel and molybdenum has been detected on all studied tiles. The thickest deposition, of around 4 μm, was measured on the bottom of the outer divertor, whereas the other surfaces (inner bottom and vertical outer) the co-deposits were around 1 μm. x-ray diffraction measurements have revealed the formation of the compound W2C on all specimens. © 2017 IOP Publishing Ltd.

Published
2017

50. Lifetime measurements in Ru 100

Author

Konstantinopoulos, T. Petkov, P. Goasduff, A. Arici, T. Astier, A. Atanasova, L. Axiotis, M. Bonatsos, D. Detistov, P. Dewald, A. Eller, M.J. Foteinou, V. Gargano, A. Georgiev, G. Gladnishki, K. Gottardo, A. Harissopulos, S. Hess, H. Kaim, S. Kocheva, D. Kusoglu, A. Lagoyannis, A. Ljungvall, J. Lutter, R. Matea, I. Melon, B. Mertzimekis, T.J. Nannini, A. Petrache, C.M. Petrovici, A. Provatas, G. Reiter, P. Rocchini, M. Roccia, S. Seidlitz, M. Siebeck, B. Suzuki, D. Warr, N. De Witte, H. Zerrouki, T.

Abstract

The nucleus Ru100 appears to be a good candidate for the E(5) critical point symmetry which describes the U(5)-SO(6) shape phase transition. To investigate this point with respect to the electromagnetic transition strengths, lifetime measurements of its yrast states have been performed using the recoil distance Doppler shift technique as well as the Doppler shift attenuation method. As a result, the lifetimes of the yrast 2+, 4+, and 8+ states were determined. The deduced transition strengths are compared to the E(5) predictions as well as to the results of excited Vampir and shell-model calculations. © 2017 American Physical Society.

Published
2017

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