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1. High-spin structures in Xe 132 and Xe 133 and evidence for isomers along the N=79 isotones

Author

Vogt, A, Siciliano, M, Birkenbach, B, Reiter, P, Hadyńska-Klȩk, K, Wheldon, C, Valiente-Dobón, JJ, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Blazhev, A, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, De Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Fransen, C, Freeman, SJ, Fu, B, Gadea, A, Gelletly, W, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hetzenegger, R, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Karayonchev, V, Kaya, L, Korten, W, Lee, IY, Leoni, S, Liang, X, Lunardi, S, MacChiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Podolyák, Z, Pollarolo, G, Pullia, A, Queiser, M, Recchia, F, Regan, PH, Régis, JM, Saed-Samii, N, Şahin, E, Scarlassara, F, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, PA, Stefanini, AM, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Warner, DD, Wolf, K, Wu, CY, and Zell, KO

Abstract

The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

Published
2017

2. High-spin structures in Xe132 and Xe133 and evidence for isomers along the N=79 isotones

Author

Vogt, A, Siciliano, M, Birkenbach, B, Reiter, P, Hadyńska-Klęk, K, Wheldon, C, Valiente-Dobón, JJ, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Blazhev, A, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, de Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Fransen, C, Freeman, SJ, Fu, B, Gadea, A, Gelletly, W, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hetzenegger, R, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Karayonchev, V, Kaya, L, Korten, W, Lee, IY, Leoni, S, Liang, X, Lunardi, S, Macchiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Podolyák, Zs, Pollarolo, G, Pullia, A, Queiser, M, Recchia, F, Regan, PH, Régis, J-M, Saed-Samii, N, Şahin, E, Scarlassara, F, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, P-A, Stefanini, AM, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Warner, DD, Wolf, K, Wu, CY, and Zell, KO

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The transitional nuclei Xe132 and Xe133 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+Pb208 MNT reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (ii) in the Xe136+Pt198 MNT reaction employing the GAMMASPHERE spectrometer in combination with the gas-detector array CHICO, and (iii) as an evaporation residue after a Te130(α,xn)Xe134-xn fusion-evaporation reaction employing the HORUS γ-ray array at the University of Cologne. The high-spin level schemes are considerably extended above the Jπ=(7-) and (10+) isomers in Xe132 and above the 11/2- isomer in Xe133. The results are compared to the high-spin systematics of the Z=54 as well as the N=78 and N=79 chains. Furthermore, evidence is found for a long-lived (T1/2â‰1μs) isomer in Xe133 which closes a gap along the N=79 isotones. Shell-model calculations employing the SN100PN and PQM130 effective interactions reproduce the experimental findings and provide guidance to the interpretation of the observed high-spin features.

Published
2017

3. Isomers and high-spin structures in the N=81 isotones Xe 135 and Ba 137

Author

Vogt, A, Birkenbach, B, Reiter, P, Blazhev, A, Siciliano, M, Hadyńska-Klȩk, K, Valiente-Dobón, JJ, Wheldon, C, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Bowry, M, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, De Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Freeman, SJ, Fu, B, Gadea, A, Geibel, K, Gelletly, W, Gengelbach, A, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Kaya, L, Korten, W, Lee, IY, Leoni, S, Lewandowski, L, Liang, X, Lunardi, S, Macchiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Pellegri, L, Podolyák, Z, Pollarolo, G, Pullia, A, Queiser, M, Radeck, F, Recchia, F, Regan, PH, Rosiak, D, Saed-Samii, N, Şahin, E, Scarlassara, F, Schneiders, D, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, PA, Stefanini, AM, Steinbach, T, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Vandone, V, Warner, DD, Wiens, A, Wu, CY, and Zell, KO

Abstract

The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 is identified as an isomer, closing a gap in the systematics along the N=81 isotones. Its half-life is measured to be 9.0(9) ns, corresponding to a reduced transition probability of B(E2,19/2-→15/2-)=0.52(6) W.u. The experimentally deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Latest shell-model calculations reproduce the experimental findings generally well and provide guidance to the interpretation of the new levels.

Published
2017

4. Isomers and high-spin structures in the N=81 isotones Xe135 and Ba137

Author

Vogt, A, Birkenbach, B, Reiter, P, Blazhev, A, Siciliano, M, Hadyńska-Klęk, K, Valiente-Dobón, JJ, Wheldon, C, Teruya, E, Yoshinaga, N, Arnswald, K, Bazzacco, D, Bowry, M, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, de Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Freeman, SJ, Fu, B, Gadea, A, Geibel, K, Gelletly, W, Gengelbach, A, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hirsch, R, Hua, H, John, PR, Jolie, J, Jungclaus, A, Kaya, L, Korten, W, Lee, IY, Leoni, S, Lewandowski, L, Liang, X, Lunardi, S, Macchiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Pearson, CJ, Pellegri, L, Podolyák, Zs, Pollarolo, G, Pullia, A, Queiser, M, Radeck, F, Recchia, F, Regan, PH, Rosiak, D, Saed-Samii, N, Şahin, E, Scarlassara, F, Schneiders, D, Seidlitz, M, Siebeck, B, Sletten, G, Smith, JF, Söderström, P-A, Stefanini, AM, Steinbach, T, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Vandone, V, Warner, DD, Wiens, A, Wu, CY, and Zell, KO

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Nuclear and plasma physics
Abstract

The high-spin structures and isomers of the N=81 isotones Xe135 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Both nuclei are populated (i) in Xe136+U238 and (ii) Xe136+Pb208 MNT reactions employing the high-resolution Advanced Gamma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA, (iii) in the Xe136+Pt198 MNT reaction employing the γ-ray array GAMMASPHERE in combination with the gas-detector array CHICO, and (iv) via a B11+Te130 fusion-evaporation reaction with the HORUS γ-ray array at the University of Cologne. The high-spin level schemesof Xe135 and Ba137 are considerably extended to higher energies. The 2058-keV (19/2-) state in Xe135 is identified as an isomer, closing a gap in the systematics along the N=81 isotones. Its half-life is measured to be 9.0(9) ns, corresponding to a reduced transition probability of B(E2,19/2-→15/2-)=0.52(6) W.u. The experimentally deduced reduced transition probabilities of the isomeric states are compared to shell-model predictions. Latest shell-model calculations reproduce the experimental findings generally well and provide guidance to the interpretation of the new levels.

Published
2017

5. Spectroscopy of Neutron-rich Fe Isotopes Populated in the \(^{70}\)Zn+\(^{238}\)U Reaction

Author

Benito, J., primary, Lenzi, S.M., additional, Recchia, F., additional, Axiotis, M., additional, Aydin, S., additional, Bazzacco, D., additional, Benzoni, G., additional, Bizzeti, P.G., additional, Bizzeti-Sona, A.M., additional, Bracco, A., additional, Broda, R., additional, Bucurescu, D., additional, Caurier, E., additional, Corradi, L., additional, de Angelis, G., additional, Della Vedova, F., additional, Farnea, E., additional, Fornal, B., additional, Fioretto, E., additional, Gadea, A., additional, Gottardo, A., additional, Ionescu-Bujor, M., additional, Iordachescu, A., additional, Leoni, S., additional, Lunardi, S., additional, Mărginean, N., additional, Mărginean, R., additional, Mason, P., additional, Menegazzo, R., additional, Mengoni, D., additional, Million, B., additional, Montagnoli, G., additional, Napoli, D.R., additional, Nowacki, F., additional, Orlandi, R., additional, Pollarolo, G., additional, Poves, A., additional, Sahin, E., additional, Scarlassara, F., additional, Singh, R.P., additional, Stefanini, A.M., additional, Szilner, S., additional, Ur, C.A., additional, Valiente-Dobón, J.J., additional, and Wieland, O., additional

Published
2024
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6. High-spin structure of Xe 134

Author

Vogt, A, Birkenbach, B, Reiter, P, Blazhev, A, Siciliano, M, Valiente-Dobón, JJ, Wheldon, C, Bazzacco, D, Bowry, M, Bracco, A, Bruyneel, B, Chakrawarthy, RS, Chapman, R, Cline, D, Corradi, L, Crespi, FCL, Cromaz, M, De Angelis, G, Eberth, J, Fallon, P, Farnea, E, Fioretto, E, Freeman, SJ, Gadea, A, Geibel, K, Gelletly, W, Gengelbach, A, Giaz, A, Görgen, A, Gottardo, A, Hayes, AB, Hess, H, Hua, H, John, PR, Jolie, J, Jungclaus, A, Korten, W, Lee, IY, Leoni, S, Liang, X, Lunardi, S, Macchiavelli, AO, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Napoli, D, Pearson, CJ, Pellegri, L, Podolyák, Z, Pollarolo, G, Pullia, A, Radeck, F, Recchia, F, Regan, PH, Şahin, E, Scarlassara, F, Sletten, G, Smith, JF, Söderström, PA, Stefanini, AM, Steinbach, T, Stezowski, O, Szilner, S, Szpak, B, Teng, R, Ur, C, Vandone, V, Ward, D, Warner, DD, Wiens, A, and Wu, CY

Abstract

Detailed spectroscopic information on the N∼82 nuclei is necessary to benchmark shell-model calculations in the region. The nuclear structure above long-lived isomers in Xe134 is investigated after multinucleon transfer (MNT) and actinide fission. Xenon-134 was populated as (i) a transfer product in Xe136+U238 and Xe136+Pb208 MNT reactions and (ii) as a fission product in the Xe136+U238 reaction employing the high-resolution Advanced Gamma Tracking Array (AGATA). Trajectory reconstruction has been applied for the complete identification of beamlike transfer products with the magnetic spectrometer PRISMA. The Xe136+Pt198 MNT reaction was studied with the γ-ray spectrometer GAMMASPHERE in combination with the gas detector array Compact Heavy Ion Counter (CHICO). Several high-spin states in Xe134 on top of the two long-lived isomers are discovered based on γγ-coincidence relationships and information on the γ-ray angular distributions as well as excitation energies from the total kinetic energy loss and fission fragments. The revised level scheme of Xe134 is extended up to an excitation energy of 5.832 MeV with tentative spin-parity assignments up to 16+. Previous assignments of states above the 7- isomer are revised. Latest shell-model calculations employing two different effective interactions reproduce the experimental findings and support the new spin and parity assignments.

Published
2016

7. Identification and rejection of scattered neutrons in AGATA

Author

Şenyiğit, M., Ataç, A., Akkoyun, S., Kaşkaş, A., Bazzacco, D., Nyberg, J., Recchia, F., Brambilla, S., Camera, F., Crespi, F. C. L., Farnea, E., Giaz, A., Gottardo, A., Kempley, R., Ljungvall, J., Mengoni, D., Michelagnoli, C., Million, B., Palacz, M., Pellegri, L., Riboldi, S., Şahin, E., Söderström, P. A., Dobon, J. J. Valiente, and collaboration, the AGATA

Subjects
Nuclear Experiment
Abstract

Gamma rays and neutrons, emitted following spontaneous fission of 252Cf, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36-fold segmented high-purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2 detectors. The aim of the experiment was to study the interaction of neutrons in the segmented high-purity germanium detectors of AGATA and to investigate the possibility to discriminate neutrons and gamma rays with the gamma-ray tracking technique. The BaF2 detectors were used for a time-of-flight measurement, which gave an independent discrimination of neutrons and gamma rays and which was used to optimise the gamma-ray tracking-based neutron rejection methods. It was found that standard gamma-ray tracking, without any additional neutron rejection features, eliminates effectively most of the interaction points due to recoiling Ge nuclei after elastic scattering of neutrons. Standard tracking rejects also a significant amount of the events due to inelastic scattering of neutrons in the germanium crystals. Further enhancements of the neutron rejection was obtained by setting conditions on the following quantities, which were evaluated for each event by the tracking algorithm: energy of the first and second interaction point, difference in the calculated incoming direction of the gamma ray, figure-of-merit value. The experimental results of tracking with neutron rejection agree rather well with Geant4 simulations.

Published
2013
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8. High-spin structure in $^{40}$K

Author

Söderström, P. -A., Recchia, F., Nyberg, J., Gadea, A., Lenzi, S. M., Poves, A., Ataç, A., Aydin, S., Bazzacco, D., Bednarczyk, P., Bellato, M., Birkenbach, B., Bortolato, D., Boston, A. J., Boston, H. C., Bruyneel, B., Bucurescu, D., Calore, E., Cederwall, B., Charles, L., Chavas, J., Colosimo, S., Crespi, F. C. L., Cullen, D. M., de Angelis, G., Désesquelles, P., Dosme, N., Duchêne, G., Eberth, J., Farnea, E., Filmer, F., Görgen, A., Gottardo, A., Grębosz, J., Gulmini, M., Hess, H., Hughes, T. A., Jaworski, G., Jolie, J., Joshi, P., Judson, D. S., Jungclaus, A., Karkour, N., Karolak, M., Kempley, R. S., Khaplanov, A., Korten, W., Ljungvall, J., Lunardi, S., Maj, A., Maron, G., Męczyński, W., Mengoni, D., Michelagnoli, C., Molini, P., Napoli, D. R., Nolan, P. J., Norman, M., Obertelli, A., Podolyak, Zs., Pullia, A., Quintana, B., Redon, N., Regan, P. H., Reiter, P., Robinson, A. P., Şahin, E., Simpson, J., Salsac, M. D., Smith, J. F., Stézowski, O., Theisen, Ch., Tonev, D., Unsworth, C., Ur, C. A., Valiente-Dobón, J. J., and Wiens, A.

Subjects
Nuclear Experiment
Abstract

High-spin states of $^{40}$K have been populated in the fusion-evaporation reaction $^{12}$C($^{30}$Si,np)$^{40}$K and studied by means of $\gamma$-ray spectroscopy techniques using one AGATA triple cluster detector, at INFN - Laboratori Nazionali di Legnaro. Several new states with excitation energy up to 8 MeV and spin up to $10^-$ have been discovered. These new states are discussed in terms of J=3 and T=0 neutron-proton hole pairs. Shell-model calculations in a large model space have shown a good agreement with the experimental data for most of the energy levels. The evolution of the structure of this nucleus is here studied as a function of excitation energy and angular momentum., Comment: 23 pages, 5 figures, submitted to Phys. Rev. C

Published
2012
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9. Response of AGATA Segmented HPGe Detectors to Gamma Rays up to 15.1 MeV

Author

Crespi, F. C. L., Avigo, R., Camera, F., Akkoyun, S., Atac, A., Bazzacco, D., Bellato, M., Benzoni, G., Blasi, N., Bortolato, D., Bottoni, S., Bracco, A., Brambilla, S., Bruyneel, B., Cerutia, S., Ciemala, M., Coelli, S., Eberth, J., Fanin, C., Farnea, E., Gadea, A., Giaz, A., Gottardo, A., Hess, H., Kmiecik, M., Leoni, S., Maj, A., Mengoni, D., Michelagnoli, C., Million, B., Montanari, D., Pellegri, L., Recchia, F., Reiter, P., Riboldi, S., Ur, C. A., Vandone, V., Valiente-Dobon, J. J., Wieland, O., Wiens, A., and Collaboration, The AGATA

Subjects
Nuclear Experiment, 81V35
Abstract

The response of AGATA segmented HPGe detectors to gamma rays in the energy range 2-15 MeV was measured. The 15.1 MeV gamma rays were produced using the reaction d(11B,ng)12C at Ebeam = 19.1 MeV, while gamma-rays between 2 to 9 MeV were produced using an Am-Be-Fe radioactive source. The energy resolution and linearity were studied and the energy-to-pulse-height conversion resulted to be linear within 0.05%. Experimental interaction multiplicity distributions are discussed and compared with the results of Geant4 simulations. It is shown that the application of gamma-ray tracking allows a suppression of background radiation following neutron capture by Ge nuclei. Finally the Doppler correction for the 15.1 MeV gamma line, performed using the position information extracted with Pulse-shape Analysis, is discussed., Comment: 10 pages, 11 figures

Published
2012
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10. AGATA - Advanced Gamma Tracking Array

Author

Akkoyun, S., Algora, A., Alikhani, B., Ameil, F., de Angelis, G., Arnold, L., Astier, A., Ataç, A., Aubert, Y., Aufranc, C., Austin, A., Aydin, S., Azaiez, F., Badoer, S., Balabanski, D. L., Barrientos, D., Baulieu, G., Baumann, R., Bazzacco, D., Beck, F. A., Beck, T., Bednarczyk, P., Bellato, M., Bentley, M. A., Benzoni, G., Berthier, R., Berti, L., Beunard, R., Bianco, G. Lo, Birkenbach, B., Bizzeti, P. G., Bizzeti-Sona, A. M., Blanc, F. Le, Blasco, J. M., Blasi, N., Bloor, D., Boiano, C., Borsato, M., Bortolato, D., Boston, A. J., Boston, H. C., Bourgault, P., Boutachkov, P., Bouty, A., Bracco, A., Brambilla, S., Brawn, I. P., Brondi, A., Broussard, S., Bruyneel, B., Bucurescu, D., Burrows, I., Bürger, A., Cabaret, S., Cahan, B., Calore, E., Camera, F., Capsoni, A., Carrió, F., Casati, G., Castoldi, M., Cederwall, B., Cercus, J. -L., Chambert, V., Chambit, M. El, Chapman, R., Charles, L., Chavas, J., Clément, E., Cocconi, P., Coelli, S., Coleman-Smith, P. J., Colombo, A., Colosimo, S., Commeaux, C., Conventi, D., Cooper, R. J., Corsi, A., Cortesi, A., Costa, L., Crespi, F. C. L., Cresswell, J. R., Cullen, D. M., Curien, D., Czermak, A., Delbourg, D., Depalo, R., Descombes, T., Désesquelles, P., Detistov, P., Diarra, C., Didierjean, F., Dimmock, M. R., Doan, Q. T., Domingo-Pardo, C., Doncel, M., Dorangeville, F., Dosme, N., Drouen, Y., Duchêne, G., Dulny, B., Eberth, J., Edelbruck, P., Egea, J., Engert, T., Erduran, M. N., Ertürk, S., Fanin, C., Fantinel, S., Farnea, E., Faul, T., Filliger, M., Filmer, F., Finck, Ch., de France, G., Gadea, A., Gast, W., Geraci, A., Gerl, J., Gernhäuser, R., Giannatiempo, A., Giaz, A., Gibelin, L., Givechev, A., Goel, N., González, V., Gottardo, A., Grave, X., Grȩbosz, J., Griffiths, R., Grint, A. N., Gros, P., Guevara, L., Gulmini, M., Görgen, A., Ha, H. T. M., Habermann, T., Harkness, L. J., Harroch, H., Hauschild, K., He, C., Hernández-Prieto, A., Hervieu, B., Hess, H., Hüyük, T., Ince, E., Isocrate, R., Jaworski, G., Johnson, A., Jolie, J., Jones, P., Jonson, B., Joshi, P., Judson, D. S., Jungclaus, A., Kaci, M., Karkour, N., Karolak, M., Kaşkaş, A., Kebbiri, M., Kempley, R. S., Khaplanov, A., Klupp, S., Kogimtzis, M., Kojouharov, I., Korichi, A., Korten, W., Kröll, Th., Krücken, R., Kurz, N., Ky, B. Y., Labiche, M., Lafay, X., Lavergne, L., Lazarus, I. H., Leboutelier, S., Lefebvre, F., Legay, E., Legeard, L., Lelli, F., Lenzi, S. M., Leoni, S., Lermitage, A., Lersch, D., Leske, J., Letts, S. C., Lhenoret, S., Lieder, R. M., Linget, D., Ljungvall, J., Lopez-Martens, A., Lotodé, A., Lunardi, S., Maj, A., van der Marel, J., Mariette, Y., Marginean, N., Marginean, R., Maron, G., Mather, A. R., Mȩczyński, W., Mendéz, V., Medina, P., Melon, B., Menegazzo, R., Mengoni, D., Merchan, E., Mihailescu, L., Michelagnoli, C., Mierzejewski, J., Milechina, L., Million, B., Mitev, K., Molini, P., Montanari, D., Moon, S., Morbiducci, F., Moro, R., Morrall, P. S., Möller, O., Nannini, A., Napoli, D. R., Nelson, L., Nespolo, M., Ngo, V. L., Nicoletto, M., Nicolini, R., Noa, Y. Le, Nolan, P. J., Norman, M., Nyberg, J., Obertelli, A., Olariu, A., Orlandi, R., Oxley, D. C., Özben, C., Ozille, M., Oziol, C., Pachoud, E., Palacz, M., Palin, J., Pancin, J., Parisel, C., Pariset, P., Pascovici, G., Peghin, R., Pellegri, L., Perego, A., Perrier, S., Petcu, M., Petkov, P., Petrache, C., Pierre, E., Pietralla, N., Pietri, S., Pignanelli, M., Piqueras, I., Podolyak, Z., Pouhalec, P. Le, Pouthas, J., Pugnére, D., Pucknell, V. F. E., Pullia, A., Quintana, B., Raine, R., Rainovski, G., Ramina, L., Rampazzo, G., La Rana, G., Rebeschini, M., Recchia, F., Redon, N., Reese, M., Reiter, P., Regan, P. H., Riboldi, S., Richer, M., Rigato, M., Rigby, S., Ripamonti, G., Robinson, A. P., Robin, J., Roccaz, J., Ropert, J. -A., Rossé, B., Alvarez, C. Rossi, Rosso, D., Rubio, B., Rudolph, D., Saillant, F., Şahin, E., Salomon, F., Salsac, M. -D., Salt, J., Salvato, G., Sampson, J., Sanchis, E., Santos, C., Schaffner, H., Schlarb, M., Scraggs, D. P., Seddon, D., Şenyiğit, M., Sigward, M. -H., Simpson, G., Simpson, J., Slee, M., Smith, J. F., Sona, P., Sowicki, B., Spolaore, P., Stahl, C., Stanios, T., Stefanova, E., Stézowski, O., Strachan, J., Suliman, G., Söderström, P. -A., Tain, J. L., Tanguy, S., Tashenov, S., Theisen, Ch., Thornhill, J., Tomasi, F., Toniolo, N., Touzery, R., Travers, B., Triossi, A., Tripon, M., Tun-Lanoë, K. M. M., Turcato, M., Unsworth, C., Ur, C. A., Valiente-Dobon, J. J., Vandone, V., Vardaci, E., Venturelli, R., Veronese, F., Veyssiere, Ch., Viscione, E., Wadsworth, R., Walker, P. M., Warr, N., Weber, C., Weisshaar, D., Wells, D., Wieland, O., Wiens, A., Wittwer, G., Wollersheim, H. J., Zocca, F., Zamfir, N. V., Ziȩbliński, M., and Zucchiatti, A.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realization of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly-segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterization of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximize its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer., Comment: This version contains a correction of a typing error in the caption of Fig. 2. The DOI to the article published in Nucl. Instr. Meth A was also added

Published
2011
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11. Transition probabilities in the X(5) candidate $^{122}$Ba

Author

Bizzeti, P. G., Bizzeti-Sona, A. M., Tonev, D., Giannatiempo, A., Ur, C. A., Dewald, A., Melon, B., Michelagnoli, C., Petkov, P., Bazzacco, D., Costin, A., de Angelis, G., Della Vedova, F., Fantuzi, M., Farnea, E., Fransen, C., Gadea, A., Lenzi, S., Lunardi, S., Marginean, N., Marginean, R., Menegazzo, R., Mengoni, D., Moeller, O., Nannini, A., Napoli, D. R., Nespolo, M., Pavan, P., Perego, A., Petrache, C. M., Pietralla, N., Alvarez, C. Rossi, and Sona, P.

Subjects
Nuclear Experiment
Abstract

To investigate the possible X(5) character of 122Ba, suggested by the ground state band energy pattern, the lifetimes of the lowest yrast states of 122Ba have been measured, via the Recoil Distance Doppler-Shift method. The relevant levels have been populated by using the 108Cd(16O,2n)122Ba and the 112Sn(13C,3n)122Ba reactions. The B(E2) values deduced in the present work are compared to the predictions of the X(5) model and to calculations performed in the framework of the IBA-1 and IBA-2 models.

Published
2010
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12. Spectroscopy of Neutron-Rich 168,170Dy: Yrast Band Evolution Close to the NpNn Valence Maximum

Author

Söderström, P. -A., Nyberg, J., Regan, P. H., Algora, A., de Angelis, G., Ashley, S. F., Aydin, S., Bazzacco, D., Casperson, R. J., Catford, W. N., Cederkäll, J., Chapman, R., Corradi, L., Fahlander, C., Farnea, E., Fioretto, E., Freeman, S. J., Gadea, A., Gelletly, W., Gottardo, A., Grodner, E., He, C. Y., Jones, G. A., Keyes, K., Labiche, M., Liang, X., Liu, Z., Lunardi, S., Mărginean, N., Mason, P., Menegazzo, R., Mengoni, D., Montagnoli, G., Napoli, D., Ollier, J., Pietri, S., Podolyák, Zs., Pollarolo, G., Recchia, F., Şahin, E., Scarlassara, F., Silvestri, R., Smith, J. F., Spohr, K. -M., Steer, S. J., Stefanini, A. M., Szilner, S., Thompson, N. J., Tveten, G. M., Ur, C. A., Valiente-Dobón, J. J., Werner, V., Williams, S. J., Xu, F. R., and Zhu, J. Y.

Subjects
Nuclear Experiment
Abstract

The yrast sequence of the neutron-rich dysprosium isotope 168Dy has been studied using multi-nucleon transfer reactions following collisions between a 460-MeV 82Se beam and a 170Er target. The reaction products were identified using the PRISMA magnetic spectrometer and the gamma rays detected using the CLARA HPGe-detector array. The 2+ and 4+ members of the previously measured ground state rotational band of 168Dy have been confirmed and the yrast band extended up to 10+. A tentative candidate for the 4+ to 2+ transition in 170Dy was also identified. The data on these nuclei and on the lighter even-even dysprosium isotopes are interpreted in terms of Total Routhian Surface calculations and the evolution of collectivity in the vicinity of the proton-neutron valence product maximum is discussed., Comment: 15 pages, 7 figures, submitted to Phys. Rev. C

Published
2009
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13. Gamma-ray spectroscopy of $^{38}_{17}$Cl using grazing reactions

Author

O'Donnell, D., Chapman, R., Liang, X., Azaiez, F., Haas, F., Beghini, S., Behera, B. R., Burns, M., Caurier, E., Corradi, L., Curien, D., Deacon, A. N., Dombradi, Z. S., Farnea, E., Fioretto, E., Hodsdon, A., Ibrahim, F., Jungclaus, A., Keyes, K., Latina, A., Marginean, N., Montagnoli, G., Napoli, D. R., Nowacki, F., Ollier, J., Papenberg, A., Pollarolo, G., Salsac, M. -D., Scarlassara, F., Smith, J. F., Spohr, K. M., Stanoiu, M., Stefanini, A. M., Szilner, S., Trotta, M., Verney, D., and Wang, Z. M.

Subjects
Nuclear Experiment
Abstract

Excited states of $^{38}_{17}$Cl$_{21}$ were populated in grazing reactions during the interaction of a beam of $^{36}_{16}$S$_{20}$ ions of energy 215 MeV with a $^{208}_{82}$Pb$_{126}$ target. The combination of the PRISMA magnetic spectrometer and the CLARA $\gamma$-ray detector array was used to identify the reaction fragments and to detect their decay via $\gamma$-ray emission. A level scheme for $^{38}$Cl is presented with tentative spin and parity assignments. The level scheme is discussed within the context of the systematics of neighboring nuclei and is compared with the results of state-of-the-art shell model calculations., Comment: 8 pages, 6 figures and 2 tables Changes: Table II and Figure 5 have been updated

Published
2009
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14. Spectroscopic studies of Dy-168,170 using CLARA and PRISMA

Author

Söderström, P. -A., Nyberg, J., Regan, P. H., Algora, A., de Angelis, G., Ashley, S. F., Aydin, S., Bazzacco, D., Casperson, R. J., Catford, W. N., Cederkäll, J., Chapman, R., Corradi, L., Fahlander, C., Farnea, E., Freeman, S. J., Gadea, A., Gelletly, W., Grodner, E., He, C. Y., Jones, G. A., Keyes, K., Labiche, M., Liang, X., Liu, Z., Lunardi, S., Marginean, N., Menegazzo, R., Mengoni, D., Napoli, D., Ollier, J., Pietri, S., Podolyàk, Zs., Recchia, F., Sahin, E., Smith, J. F., Spohr, K. M., Steer, S. J., Stefanini, A., Thompson, N. J., Tveten, G., Ur, C. A., Valiente-Dóbon, J. J., Werner, V., and Williams, S. J.

Subjects
Nuclear Experiment
Abstract

Preliminary results from an experiment aiming at Dy-170. Submitted to the LNL Annual Report 2008., Comment: 2 pages, 4 figures, Submitted to the LNL Annual Report 2008

Published
2009

15. AGATA: Gamma-ray tracking in segmented HPGe detectors

Author

Söderström, P. -A., Al-Adili, A., Nyberg, J., Recchia, F., Farnea, E., and Gadea, A.

Subjects
Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The next generation of radioactive ion beam facilities, which will give experimental access to many exotic nuclei, are presently being developed. At the same time the next generation of high resolution gamma-ray spectrometers, based on gamma-ray tracking, for studying the structure of these exotic nuclei are being developed. One of the main differences in tracking of $\gamma$ rays versus charged particles is that the gamma rays do not deposit their energy "continuously" in the detector, but in a few discrete steps. Also, in the field of nuclear spectroscopy, the location of the source is mostly well known while the exact interaction position in the detector is the unknown quantity. This makes the challenges of gamma-ray tracking in germanium somewhat different compared to vertexing in silicon detectors. In these proceedings we present the methods for determining the 3D interaction positions in the detector and how these are used to reconstruct the gamma-ray tracks in the AGATA detector array. We also present preliminary simulation results of a proposed in-beam method to measure the interaction position resolution in the germanium detectors., Comment: 10 pages, 6 figures. To appear in the proceedings of 17th International Workshop on Vertex detectors July 28 - 1 August 2008 Uto Island, Sweden

Published
2008

16. Multinucleon transfer reactions in closed-shell nuclei

Author

Szilner, S., Ur, C. A., Corradi, L., Marginean, N., Pollarolo, G., Stefanini, A. M., Beghini, S., Behera, B. R., Fioretto, E., Gadea, A., Guiot, B., Latina, A., Mason, P., Montagnoli, G., Scarlassara, F., Trotta, M., de Angelis, G., Della Vedova, F., Farnea, E., Haas, F., Lenzi, S., Lunardi, S., Marginean, R., Menegazzo, R, Napoli, D. R., Nespolo, M., Pokrovsky, I. V., Recchia, F., Romoli, M., Salsac, M. -D., Soic, N., and Valiente-Dobon, J. J.

Subjects
Nuclear Experiment
Abstract

Multinucleon transfer reactions in 40Ca+96Zr and 90Zr+208Pb have been measured at energies close to the Coulomb barrier in a high resolution gamma-particle coincidence experiment. The large solid angle magnetic spectrometer PRISMA coupled to the CLARA gamma-array has been employed. Trajectory reconstruction has been applied for the complete identification of transfer products. Mass and charge yields, total kinetic energy losses, gamma transitions of the binary reaction partners, and comparison of data with semiclassical calculations are reported. Specific transitions in 95Zr populated in one particle transfer channels are discussed in terms of particle-phonon couplings. The gamma decays from states in 42Ca in the excitation energy region expected from pairing vibrations are also observed., Comment: 10 pages, 9 figures

Published
2007
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17. Strong Deformation Effects in Hot Rotating 46Ti

Author

Kmiecik, M., Maj, A., Brekiesz, M., Mazurek, K., Bednarczyk, P., Grebosz, J., Meczynski, W., Styczen, J., Zieblinski, M., Zuber, K., Papka, P., Beck, C., Curien, D., Haas, F., Rauch, V., Rousseau, M., Dudek, J., Schunck, N., Bracco, A., Camera, F., Benzoni, G., Wieland, O., Herskind, B., Farnea, E., and De Angelis, G.

Subjects
Nuclear Experiment
Abstract

Exotic-deformation effects in 46Ti nucleus were investigated by analysing the high-energy gamma-ray and the alpha-particle energy spectra. One of the experiments was performed using the charged-particle multi-detector array ICARE together with a large volume (4"x4") BGO detector. The study focused on simultaneous measurement of light charged particles and gamma-rays in coincidence with the evaporation residues. The experimental data show a signature of very large deformations of the compound nucleus in the Jacobi transition region at the highest spins. These results are compared to data from previous experiments performed with the HECTOR array coupled to the EUROBALL array, where it was found that the GDR strength function is highly fragmented, strongly indicating a presence of nuclei with very large deformation., Comment: 10 pages, 6 figures, Proceedings of the Zakopane Conference on Nuclear Physics, to be published in Acta Phys. Pol. B (2007)

Published
2006

18. Evidence for the Jacobi shape transition in hot 46Ti

Author

Maj, A., Kmiecik, M., Bracco, A., Camera, F., Bednarczyk, P., Herskind, B., Brambilla, S., Benzoni, G., Brekiesz, M., Curien, D., DeAngelis, G., Farnea, E., Grebosz, J., Kicinska-Habior, M., Leoni, S., Meczynski, W., Million, B., Napoli, D. R., Nyberg, J., Petrache, C. M., Styczen, J., Wieland, O., Zieblinski, M., Zuber, K., Dubray, N., Dudek, J., and Pomorski, K.

Subjects
Nuclear Experiment
Abstract

The gamma-rays from the decay of the GDR in 46Ti compound nucleus formed in the 18O+28Si reaction at bombarding energy 105 MeV have been measured in an experiment using a setup consisting of the combined EUROBALL IV, HECTOR and EUCLIDES arrays. A comparison of the extracted GDR lineshape data with the predictions of the thermal shape fluctuation model shows evidence for the Jacobi shape transition in hot 46Ti. In addition to the previously found broad structure in the GDR lineshape region at 18-27 MeV caused by large deformations, the presence of a low energy component (around 10 MeV), due to the Coriolis splitting in prolate well deformed shape, has been identified for the first time., Comment: 8 pages, 4 figures, proceedings of the COMEX1 conference, June 2003, Paris; to be published in Nucl. Phys. A

Published
2003
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19. Band termination in the N=Z Odd-Odd Nucleus 46V

Author

Lenzi, S. M., Napoli, D. R., Ur, C. A., Bazzacco, D., Brandolini, F., Cameron, J. A., Caurier, E., de Angelis, G., De Poli, M., Farnea, E., Gadea, A., Hankonen, S., Lunardi, S., Martinez-Pinedo, G., Podolyak, Zs., Poves, A., Alvarez, C. Rossi, Sanchez-Solano, J., and Somacal, H.

Subjects
Nuclear Experiment
Abstract

High spin states in the odd-odd N=Z nucleus 46V have been identified. At low spin, the T=1 isobaric analogue states of 46Ti are established up to I = 6+. Other high spin states, including the band terminating state, are tentatively assigned to the same T=1 band. The T=0 band built on the low-lying 3+ isomer is observed up to the 1f7/2-shell termination at I=15. Both signatures of a negative parity T=0 band are observed up to the terminating states at I = 16- and I = 17-, respectively. The structure of this band is interpreted as a particle-hole excitation from the 1d3/2 shell. Spherical shell model calculations are found to be in excellent agreement with the experimental results., Comment: 5 pages, 4 figures

Published
1999
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20. Magnetic rotation in the nucleus Eu-141

Author

Marcinkowska, Z, Rzaca-Urban, T, Droste, C, Morek, T, Czajkowska, B, Urban, W, Marcinkowski, R, Olbratowski, P, Lieder, RM, Brans, H, Gast, W, Jager, HM, Mihailescu, L, Bazzacco, D, Falconi, G, Menegazzo, R, Lunardi, S, Rossi-Alvarez, C, de Angelis, G, Farnea, E, Gadea, A, Napoli, DR, and Podolyak, Z

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Published
2003

21. Magnetic rotation in the nucleus 141Eu

Author

Marcinkowska, Z, Rzaca-Urban, T, Droste, C, Morek, T, Czajkowska, B, Urban, W, Marcinkowski, R, Olbratowski, P, Lieder, RM, Brans, H, Gast, W, Jager, HM, Mihailescu, L, Bazzacco, D, Falconi, G, Menegazzo, R, Lunardi, S, Rossi-Alvarez, C, De Angelis, G, Farnea, E, Gadea, A, Napoli, DR, and Podolyak, Z

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Abstract

The previously known level scheme of 141Eu nucleus was revised and substantially extended. Three dipole cascades, characterized by large B(M1)/B(E2) ratios, have been found. Spin and parity assignments were based on the angular distribution ratios and linear polarizations of γ-rays. The experimental results have been compared with the calculations of Tilted Axis Cranking (TAC) model.

Published
2003

22. Study of medium-spin states of neutron-rich 87, 89, 91Rb isotopes

Author

Torres, D. A., Chapman, R., Kumar, V., Hadinia, B., Hodsdon, A., Labiche, M., Liang, X., O’Donnell, D., Ollier, J., Orlandi, R., Smith, J. F., Spohr, K. -M., Wady, P., Wang, Z. M., Corradi, L., Fioretto, E., Gadea, A., de Angelis, G., Mărginean, N., Napoli, D. R., Sahin, E., Stefanini, A. M., Valiente-Dobón, J. J., Vedova, F. D., Axiotis, M., Martinez, T., Szilner, S., Bazzacco, D., Beghini, S., Farnea, E., Mărginean, R., Mengoni, D., Montagnoli, G., Recchia, F., Scarlassara, F., Ur, C. A., Lenzi, S. M., Lunardi, S., Kröll, T., Haas, F., Faul, T., Hjorth-Jensen, M., Carlsson, B. G., Freeman, S. J., Smith, A. G., Jones, G., Thompson, N., Pollarolo, G., and Simpson, G. S.

Published
2019
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26. Structure of the [formula omitted] As, Ge, Ga nuclei

Author

Sahin, E., de Angelis, G., Duchene, G., Faul, T., Gadea, A., Lisetskiy, A.F., Ackermann, D., Algora, A., Aydin, S., Azaiez, F., Bazzacco, D., Benzoni, G., Bostan, M., Byrski, T., Celikovic, I., Chapman, R., Corradi, L., Courtin, S., Curien, D., Pramanik, U. Datta, Didierjean, F., Dorvaux, O., Erduran, M.N., Erturk, S., Farnea, E., Fioretto, E., de France, G., Franchoo, S., Gall, B., Gottardo, A., Guiot, B., Haas, F., Ibrahim, F., Ince, E., Khouaja, A., Kusoglu, A., La Rana, G., Labiche, M., Lebhertz, D., Lenzi, S., Leoni, S., Lunardi, S., Mason, P., Mengoni, D., Michelagnoli, C., Modamio, V., Montagnoli, G., Montanari, D., Moro, R., Mouginot, B., Napoli, D.R., OʼDonnell, D., Oliveira, J.R.B., Ollier, J., Orlandi, R., Pollarolo, G., Recchia, F., Robin, J., Salsac, M.-D., Scarlassara, F., Singh, R.P., Silvestri, R., Smith, J.F., Stefan, I., Stefanini, A.M., Subotic, K., Szilner, S., Tonev, D., Torres, D.A., Trotta, M., Ujic, P., Ur, C., Valiente-Dobón, J.J., Verney, D., Yalcinkaya, M., Wady, P.T., Wiedemann, K.T., and Zuber, K.

Published
2012
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28. Conceptual design and infrastructure for the installation of the first AGATA sub-array at LNL

Author

Gadea, A., Farnea, E., Valiente-Dobón, J.J., Million, B., Mengoni, D., Bazzacco, D., Recchia, F., Dewald, A., Pissulla, Th., Rother, W., de Angelis, G., Austin, A., Aydin, S., Badoer, S., Bellato, M., Benzoni, G., Berti, L., Beunard, R., Birkenbach, B., Bissiato, E., Blasi, N., Boiano, C., Bortolato, D., Bracco, A., Brambilla, S., Bruyneel, B., Calore, E., Camera, F., Capsoni, A., Chavas, J., Cocconi, P., Coelli, S., Colombo, A., Conventi, D., Costa, L., Corradi, L., Corsi, A., Cortesi, A., Crespi, F.C.L., Dosme, N., Eberth, J., Fantinel, S., Fanin, C., Fioretto, E., Fransen, Ch., Giaz, A., Gottardo, A., Grave, X., Grebosz, J., Griffiths, R., Grodner, E., Gulmini, M., Habermann, T., He, C., Hess, H., Isocrate, R., Jolie, J., Jones, P., Latina, A., Legay, E., Lenzi, S., Leoni, S., Lelli, F., Lersch, D., Lunardi, S., Maron, G., Menegazzo, R., Michelagnoli, C., Molini, P., Montagnoli, G., Montanari, D., Möller, O., Napoli, D.R., Nicoletto, M., Nicolini, R., Ozille, M., Pascovici, G., Peghin, R., Pignanelli, M., Pucknell, V., Pullia, A., Ramina, L., Rampazzo, G., Rebeschini, M., Reiter, P., Riboldi, S., Rigato, M., Rossi Alvarez, C., Rosso, D., Salvato, G., Strachan, J., Sahin, E., Scarlassara, F., Simpson, J., Stefanini, A.M., Stezowski, O., Tomasi, F., Toniolo, N., Triossi, A., Turcato, M., Ur, C.A., Vandone, V., Venturelli, R., Veronese, F., Veyssiere, C., Viscione, E., Wieland, O., Wiens, A., Zocca, F., and Zucchiatti, A.

Published
2011
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30. Interaction position resolution simulations and in-beam measurements of the AGATA HPGe detectors

Author

Söderström, P.-A., Recchia, F., Nyberg, J., Al-Adili, A., Ataç, A., Aydin, S., Bazzacco, D., Bednarczyk, P., Birkenbach, B., Bortolato, D., Boston, A.J., Boston, H.C., Bruyneel, B., Bucurescu, D., Calore, E., Colosimo, S., Crespi, F.C.L., Dosme, N., Eberth, J., Farnea, E., Filmer, F., Gadea, A., Gottardo, A., Grave, X., Grebosz, J., Griffiths, R., Gulmini, M., Habermann, T., Hess, H., Jaworski, G., Jones, P., Joshi, P., Judson, D.S., Kempley, R., Khaplanov, A., Legay, E., Lersch, D., Ljungvall, J., Lopez-Martens, A., Meczynski, W., Mengoni, D., Michelagnoli, C., Molini, P., Napoli, D.R., Orlandi, R., Pascovici, G., Pullia, A., Reiter, P., Sahin, E., Smith, J.F., Strachan, J., Tonev, D., Unsworth, C., Ur, C.A., Valiente-Dobón, J.J., Veyssiere, C., and Wiens, A.

Published
2011
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31. Transition probabilities in 31P and 31S: A test for isospin symmetry

Author

Tonev, D., de Angelis, G., Deloncle, I., Goutev, N., De Gregorio, G., Pavlov, P., Pantaleev, I.L., Iliev, S., Yavahchova, M.S., Bizzeti, P.G., Demerdjiev, A., Dimitrov, D.T., Farnea, E., Gadea, A., Geleva, E., He, C.Y., Laftchiev, H., Lenzi, S.M., Lunardi, S., Marginean, N., Menegazzo, R., Napoli, D.R., Nowacki, F., Orlandi, R., Penttilä, H., Recchia, F., Sahin, E., Singh, R.P., Stoyanova, M., Ur, C.A., and Wirth, H.-F.

Published
2021
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34. Evolution of the Ar isotopic chain: the N=28 shell gap south of 48Ca

Author

Mengoni, D., Valiente-Dobón, J.J., Gadea, A., Lenzi, S.M., Lunardi, S., Broda, R., Dewald, A., Pissulla, T., Angus, L., Aydin, S., Bazzacco, D., Benzoni, G., Bizzeti, P.G., Bizzeti-Sona, A.M., Corradi, L., Crespi, F., de Angelis, G., Farnea, E., Fioretto, E., Goergen, A., Gottardo, A., Grodner, E., Królas, W., Leoni, S., Mason, P., Montanari, D., Montagnoli, G., Napoli, D.R., Obertelli, A., Pawłat, T., Pollarolo, G., Recchia, F., Algora, A., Rubio, B., Sahin, E., Scarlassara, F., Smith, J.F., Stefanini, A.M., Szilner, S., Ur, C.A., Wady, P.T., and Wrzesiński, J.

Published
2010
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36. Transition probabilities in P and S: A test for isospin symmetry

Author

Tonev, D., de Angelis, G., Deloncle, I., Goutev, N., De Gregorio, G., Pavlov, P., Pantaleev, I.L., Iliev, S., Yavahchova, M.S., Bizzeti, P.G., Demerdjiev, A., Dimitrov, D.T., Farnea, E., Gadea, A., Geleva, E., He, C.Y., Laftchiev, H., Lenzi, S.M., Lunardi, S., Marginean, N., Menegazzo, R., Napoli, D.R., Nowacki, F., Orlandi, R., Penttilä, H., Recchia, F., Sahin, E., Singh, R.P., Stoyanova, M., Ur, C.A., and Wirth, H.F.

Abstract

Excited states in the mirror nuclei $^{31}$P and $^{31}$S were populated in the 1p and 1n exit channels of the reaction $^{20}$Ne + $^{12}$C, at a beam energy of 33 MeV. The $^{20}$Ne beam was delivered for the first time by the Piave-Alpi accelerator of the Laboratori Nazionali di Legnaro. Angular correlations of coincident γ-rays and Doppler-shift attenuation lifetime measurements were performed using the multi-detector array GASP in conjunction with the EUCLIDES charged particle detector. In the observed B(E1) strengths, the isoscalar component, amounting to 24% of the isovector one, provides strong evidence for breaking of the isospin symmetry in the A=31 mass region. Self-consistent beyond mean field calculations using Equation of Motion method based on a chiral potential and including two- and three-body forces reproduce well the experimental B(E1) strengths, reinforcing our conclusion. Coherent mixing from higher-lying states involving the Giant Isovector Monopole Resonance accounts well for the effect observed. The breaking of the isospin symmetry originates from the violation of the charge symmetry of the two- and three-body parts of the potential, only related to the Coulomb interaction.

Published
2021

38. Position resolution of the prototype AGATA triple-cluster detector from an in-beam experiment

Author

Recchia, F., Bazzacco, D., Farnea, E., Gadea, A., Venturelli, R., Beck, T., Bednarczyk, P., Buerger, A., Dewald, A., Dimmock, M., Duchêne, G., Eberth, J., Faul, T., Gerl, J., Gernhaeuser, R., Hauschild, K., Holler, A., Jones, P., Korten, W., Kröll, Th., Krücken, R., Kurz, N., Ljungvall, J., Lunardi, S., Maierbeck, P., Mengoni, D., Nyberg, J., Nelson, L., Pascovici, G., Reiter, P., Schaffner, H., Schlarb, M., Steinhardt, T., Thelen, O., Ur, C.A., Valiente Dobon, J.J., and Weißhaar, D.

Published
2009
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42. Electromagnetic properties of vibrational bands in 170Er

Author

DiJulio, D. D., Cederkall, J., Fahlander, C., Ekström, A., Golubev, P., Mattsson, K., Rudolph, D., de Angelis, G., Aydin, S., Y. Deo, A., Farnea, E., Farrelly, G., Geibel, K., He, C., Iwanicki, J., Kempley, R., Marginean, N., Menegazzo, R., Mengoni, D., Orlandi, R., Podolyak, Z., Recchia, F., Reiter, P., Sahin, E., Smith, J., Söderström, P. A., Torres, D. A., Tveten, G. M., Ur, C. A., Valiente-Dobón, J. J., Wendt, A., and Zielińska, M.

Published
2011
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45. Decay of a narrow and high spin 24Mg + 24Mg resonance

Author

Salsac, M.-D., Haas, F., Courtin, S., Algora, A., Beck, C., Beghini, S., Behera, B.R., Chapman, R., Corradi, L., Dombradi, Z., Farnea, E., Fioretto, E., Gadea, A., Jenkins, D.G., Latina, A., Lebhertz, D., Lenzi, S., Liang, X., Marginean, N., Montagnoli, G., Napoli, D., Papka, P., Pokrovski, I., Pollarolo, G., Rousseau, M., Sahin, E., Sanchez i Zafra, A., Scarlassara, F., Sohler, D., Stefanini, A.M., Szilner, S., Trotta, M., Ur, C., Vedova, F. Della, Wang, Z.M., and Wiedemann, K.T.

Published
2008
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47. Isomer spectroscopy in Ba 133 and high-spin structure of Ba 134

Author

Kaya L., Vogt A., Reiter P., Siciliano M., Shimizu N., Utsuno Y., Wang H. -K., Gargano A., Coraggio L., Itaco N., Arnswald K., Bazzacco D., Birkenbach B., Blazhev A., Bracco A., Bruyneel B., Corradi L., Crespi F. C. L., De Angelis G., Droste M., Eberth J., Esmaylzadeh A., Farnea E., Fioretto E., Fransen C., Gadea A., Giaz A., Gorgen A., Gottardo A., Hadynska-Klek K., Hess H., Hirsch R., John P. R., Jolie J., Jungclaus A., Karayonchev V., Kornwebel L., Korten W., Leoni S., Lewandowski L., Lunardi S., Menegazzo R., Mengoni D., Michelagnoli C., Mijatovic T., Montagnoli G., Montanari D., Muller-Gatermann C., Napoli D., Podolyak Z., Pollarolo G., Recchia F., Regis J. -M., Saed-Samii N., Sahin E., Scarlassara F., Schomacker K., Seidlitz M., Siebeck B., Soderstrom P. -A., Stefanini A. M., Stezowski O., Szilner S., Szpak B., Teruya E., Ur C., Valiente-Dobon J. J., Wolf K., Yanase K., Yoshinaga N., Zell K. O., Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Shimizu, N., Utsuno, Y., Wang, H. -K., Gargano, A., Coraggio, L., Itaco, N., Arnswald, K., Bazzacco, D., Birkenbach, B., Blazhev, A., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F. C. L., De Angelis, G., Droste, M., Eberth, J., Esmaylzadeh, A., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Gorgen, A., Gottardo, A., Hadynska-Klek, K., Hess, H., Hirsch, R., John, P. R., Jolie, J., Jungclaus, A., Karayonchev, V., Kornwebel, L., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatovic, T., Montagnoli, G., Montanari, D., Muller-Gatermann, C., Napoli, D., Podolyak, Z., Pollarolo, G., Recchia, F., Regis, J. -M., Saed-Samii, N., Sahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Soderstrom, P. -A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobon, J. J., Wolf, K., Yanase, K., Yoshinaga, N., and Zell, K. O.

Abstract

The transitional nuclei Ba134 and Ba133 are investigated after multinucleon transfer employing the high-resolution Advanced GAmma Tracking Array coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and after fusion-evaporation reaction at the FN tandem accelerator of the University of Cologne, Germany. The Jπ=19/2+ state at 1942 keV in Ba133 is identified as an isomer with a half-life of 66.6(20)ns corresponding to a B(E1) value of 7.7(4)×10-6e2fm2 for the Jπ=19/2+ to Jπ=19/2- transition. The level scheme of Ba134 above the Jπ=10+ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ω=0.38 MeV along the positive-parity yrast band. The results are compared to the high-spin systematics of the Z=56 isotopes. Large-scale shell-model calculations employing the GCN50:82, SN100PN, SNV, PQM130, Realistic SM, and EPQQM interactions reproduce the experimental findings and elucidate the structure of the high-spin states. The shell-model calculations employing the GCN50:82 and PQM130 interactions reproduce alignment properties and provide detailed insight into the microscopic origin of this phenomenon in transitional Ba134.

Published
2019

48. Identification of high-spin proton configurations in Ba 136 and Ba 137

Author

Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Gargano, A., Coraggio, L., Itaco, N., Blazhev, A., Arnswald, K., Bazzacco, D., Birkenbach, B., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F. C. L., De Angelis, G., Droste, M., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klȩk, K., Hess, H., Hetzenegger, R., Hirsch, R., John, P. R., Jolie, J., Jungclaus, A., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatović, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Siciliano, M., Scarlassara, F., Seidlitz, M., Söderström, P. -A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J. J., Weinert, M., Wolf, K., Zell, K. O., Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Gargano, A., Coraggio, L., Itaco, N., Blazhev, A., Arnswald, K., Bazzacco, D., Birkenbach, B., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F. C. L., De Angelis, G., Droste, M., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klȩk, K., Hess, H., Hetzenegger, R., Hirsch, R., John, P. R., Jolie, J., Jungclaus, A., Korten, W., Leoni, S., Lewandowski, L., Lunardi, S., Menegazzo, R., Mengoni, D., Michelagnoli, C., Mijatović, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Siciliano, M., Scarlassara, F., Seidlitz, M., Söderström, P. -A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J. J., Weinert, M., Wolf, K., and Zell, K. O.

Subjects
Nuclear and High Energy Physics
Abstract

The high-spin structures of Ba136 and Ba137 are investigated after multinucleon-transfer (MNT) and fusion-evaporation reactions. Ba136 is populated in a Xe136+U238 MNT reaction employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and in two Be9+Te130 fusion-evaporation reactions using the High-efficiency Observatory for γ-Ray Unique Spectroscopy (HORUS) at the FN tandem accelerator of the University of Cologne, Germany. Furthermore, both isotopes are populated in an elusive reaction channel in the B11+Te130 fusion-evaporation reaction utilizing the HORUS γ-ray array. The level scheme above the Jπ=10+ isomer in Ba136 is revised and extended up to an excitation energy of approximately 5.5 MeV. From the results of angular-correlation measurements, the Ex=3707- and Ex=4920-keV states are identified as the bandheads of positive- and negative-parity cascades. While the high-spin regimes of both Te132 and Xe134 are characterized by high-energy 12+→10+ transitions, the Ba136E2 ground-state band is interrupted by negative-parity states only a few hundred keV above the Jπ=10+ isomer. Furthermore, spins are established for several hitherto unassigned high-spin states in Ba137. The new results close a gap along the high-spin structure of N

Published
2019

49. Nuclear spectroscopy near the proton drip line in the lanthanide region: The122La nucleus

Author

Fantuzi, M., Petrache, C. M., Mengoni, D., Axiotis, M., Bazzacco, D., Benzoni, G., Bizzeti, P. G., Bizzeti-Sona, A. M., Blasi, N., Bracco, A., de Angelis, G., Farnea, E., Gadea, A., Kröll, Th., Leoni, S., Liu, H. L., Lunardi, S., Marginean, N., Menegazzo, R., Napoli, D. R., Nespolo, M., Pavan, P., Rossi Alvarez, C., Spolaore, P., Ur, C. A., Venturelli, R., and Xu, F. R.

Published
2008
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