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28 results on '"Michelagnoli C."'

1. High-Precision Spectroscopy of O20 Benchmarking Ab Initio Calculations in Light Nuclei

Author

Zanon, I., primary, Clément, E., additional, Goasduff, A., additional, Menéndez, J., additional, Miyagi, T., additional, Assié, M., additional, Ciemała, M., additional, Flavigny, F., additional, Lemasson, A., additional, Matta, A., additional, Ramos, D., additional, Rejmund, M., additional, Achouri, L., additional, Ackermann, D., additional, Barrientos, D., additional, Beaumel, D., additional, Benzoni, G., additional, Boston, A. J., additional, Boston, H. C., additional, Bottoni, S., additional, Bracco, A., additional, Brugnara, D., additional, de France, G., additional, de Sereville, N., additional, Delaunay, F., additional, Desesquelles, P., additional, Didierjean, F., additional, Domingo-Prato, C., additional, Dudouet, J., additional, Eberth, J., additional, Fernández, D., additional, Fougères, C., additional, Gadea, A., additional, Galtarossa, F., additional, Girard-Alcindor, V., additional, Gonzales, V., additional, Gottardo, A., additional, Hammache, F., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Kaşkaş, A., additional, Kim, Y. H., additional, Kuşoğlu, A., additional, Labiche, M., additional, Leblond, S., additional, Lenain, C., additional, Lenzi, S. M., additional, Leoni, S., additional, Li, H., additional, Ljungvall, J., additional, Lois-Fuentes, J., additional, Lopez-Martens, A., additional, Maj, A., additional, Menegazzo, R., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Napoli, D. R., additional, Nyberg, J., additional, Pasqualato, G., additional, Podolyak, Zs., additional, Pullia, A., additional, Quintana, B., additional, Recchia, F., additional, Regueira-Castro, D., additional, Reiter, P., additional, Rezynkina, K., additional, Rojo, J. S., additional, Salsac, M. D., additional, Sanchis, E., additional, Şenyiğit, M., additional, Siciliano, M., additional, Sohler, D., additional, Stezowski, O., additional, Theisen, Ch., additional, Utepov, A., additional, Valiente-Dobón, J. J., additional, Verney, D., additional, and Zielinska, M., additional

Published
2023
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2. Evidence of Partial Seniority Conservation in the πg9/2 Shell for the N=50 Isotones

Author

Pérez-Vidal, R. M., primary, Gadea, A., additional, Domingo-Pardo, C., additional, Gargano, A., additional, Valiente-Dobón, J. J., additional, Clément, E., additional, Lemasson, A., additional, Coraggio, L., additional, Siciliano, M., additional, Szilner, S., additional, Bast, M., additional, Braunroth, T., additional, Collado, J., additional, Corina, A., additional, Dewald, A., additional, Doncel, M., additional, Dudouet, J., additional, de France, G., additional, Fransen, C., additional, González, V., additional, Hüyük, T., additional, Jacquot, B., additional, John, P. R., additional, Jungclaus, A., additional, Kim, Y. H., additional, Korichi, A., additional, Labiche, M., additional, Lenzi, S., additional, Li, H., additional, Ljungvall, J., additional, López-Martens, A., additional, Mengoni, D., additional, Michelagnoli, C., additional, Müller-Gatermann, C., additional, Napoli, D. R., additional, Navin, A., additional, Quintana, B., additional, Ramos, D., additional, Rejmund, M., additional, Sanchis, E., additional, Simpson, J., additional, Stezowski, O., additional, Wilmsen, D., additional, Zielińska, M., additional, Boston, A. J., additional, Barrientos, D., additional, Bednarczyk, P., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, H. C., additional, Bracco, A., additional, Cederwall, B., additional, Cullen, D. M., additional, Didierjean, F., additional, Eberth, J., additional, Gottardo, A., additional, Goupil, J., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Kaşkaş, A., additional, Korten, W., additional, Leoni, S., additional, Menegazzo, R., additional, Million, B., additional, Nyberg, J., additional, Podolyak, Zs., additional, Pullia, A., additional, Ralet, D., additional, Recchia, F., additional, Reiter, P., additional, Rezynkina, K., additional, Salsac, M. D., additional, Şenyiğit, M., additional, Sohler, D., additional, Theisen, Ch., additional, and Verney, D., additional

Published
2022
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3. Shape coexistence at zero spin in 64Ni driven by the monopole tensor interaction

Author

Mărginean, N., Little, D., Tsunoda, Y., Leoni, S., Janssens, R.V.F., Fornal, B., Michelagnoli, C., Stan, L., Crespi, F.C.L., Lică, R., Sferrazza, M., Turturica, A., Ayangeakaa, A.D., Auranen, K., Barani, M., Bender, P.C., Bottoni, S., Boromiza, M., Bracco, A., Călinescu, S., Campbell, C.M., Carpenter, M.P., Chowdhury, P., Ciemała, M., Cieplicka-Oryńczak, N., Cline, D., Clisu, C., Crawford, H.L., Dinescu, I.E., Dudouet, J., Florea, N., Forney, A.M., Fracassetti, S., Gade, A., Gheorghe, I., Hayes, A.B., Harca, I., Henderson, J., Ionescu, A., Iskra, Ł.W., Jentschel, M., Kandzia, F., Kim, Y.H., Kondev, F.G., Korschinek, G., Köster, U., Krzysiek, M., Lauritsen, T., Li, J., Mărginean, R., Maugeri, E.A., Mihai, R.E., Mitu, A., Mutti, P., Negret, A., Niţă, C.R., Olăcel, A., Oprea, A., Pascu, S., Petrone, C., Porzio, C., Rhodes, D., Schumann, D., Sotty, C., Stolze, S.M., Şuvăilă, R., Toma, S., Ujeniuc, S., Walters, W.B., Wu, C.Y., Wu, J., Zhu, S., and Ziliani, S.

Subjects
Nuclear Theory
Abstract

The low-spin structure of the semimagic 64Ni nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.

Published
2020

4. Evidence for Coexisting Shapes through Lifetime Measurements in Zr98

Author

Singh, Purnima, primary, Korten, W., additional, Hagen, T. W., additional, Görgen, A., additional, Grente, L., additional, Salsac, M.-D., additional, Farget, F., additional, Clément, E., additional, de France, G., additional, Braunroth, T., additional, Bruyneel, B., additional, Celikovic, I., additional, Delaune, O., additional, Dewald, A., additional, Dijon, A., additional, Delaroche, J.-P., additional, Girod, M., additional, Hackstein, M., additional, Jacquot, B., additional, Libert, J., additional, Litzinger, J., additional, Ljungvall, J., additional, Louchart, C., additional, Gottardo, A., additional, Michelagnoli, C., additional, Müller-Gatermann, C., additional, Napoli, D. R., additional, Otsuka, T., additional, Pillet, N., additional, Recchia, F., additional, Rother, W., additional, Sahin, E., additional, Siem, S., additional, Sulignano, B., additional, Togashi, T., additional, Tsunoda, Y., additional, Theisen, Ch., additional, and Valiente-Dobon, J. J., additional

Published
2018
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5. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the Ni78 Region: A Hint from Lifetime Measurements

Author

Delafosse, C., primary, Verney, D., additional, Marević, P., additional, Gottardo, A., additional, Michelagnoli, C., additional, Lemasson, A., additional, Goasduff, A., additional, Ljungvall, J., additional, Clément, E., additional, Korichi, A., additional, De Angelis, G., additional, Andreoiu, C., additional, Babo, M., additional, Boso, A., additional, Didierjean, F., additional, Dudouet, J., additional, Franchoo, S., additional, Gadea, A., additional, Georgiev, G., additional, Ibrahim, F., additional, Jacquot, B., additional, Konstantinopoulos, T., additional, Lenzi, S. M., additional, Maquart, G., additional, Matea, I., additional, Mengoni, D., additional, Napoli, D. R., additional, Nikšić, T., additional, Olivier, L., additional, Pérez-Vidal, R. M., additional, Portail, C., additional, Recchia, F., additional, Redon, N., additional, Siciliano, M., additional, Stefan, I., additional, Stezowski, O., additional, Vretenar, D., additional, Zielinska, M., additional, Barrientos, D., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Cederwall, B., additional, Charles, L., additional, Ciemala, M., additional, Collado, J., additional, Cullen, D. M., additional, Désesquelles, P., additional, de France, G., additional, Domingo-Pardo, C., additional, Eberth, J., additional, González, V., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Korten, W., additional, Lefevre, A., additional, Legruel, F., additional, Menegazzo, R., additional, Million, B., additional, Nyberg, J., additional, Quintana, B., additional, Ralet, D., additional, Reiter, P., additional, Saillant, F., additional, Sanchis, E., additional, Theisen, Ch., additional, and Valiente Dobon, J. J., additional

Published
2018
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6. Neutron Skin Effects in Mirror Energy Differences: The Case of Mg23−Na23

Author

Boso, A., primary, Lenzi, S. M., additional, Recchia, F., additional, Bonnard, J., additional, Zuker, A. P., additional, Aydin, S., additional, Bentley, M. A., additional, Cederwall, B., additional, Clement, E., additional, de France, G., additional, Di Nitto, A., additional, Dijon, A., additional, Doncel, M., additional, Ghazi-Moradi, F., additional, Gadea, A., additional, Gottardo, A., additional, Henry, T., additional, Hüyük, T., additional, Jaworski, G., additional, John, P. R., additional, Juhász, K., additional, Kuti, I., additional, Melon, B., additional, Mengoni, D., additional, Michelagnoli, C., additional, Modamio, V., additional, Napoli, D. R., additional, Nyakó, B. M., additional, Nyberg, J., additional, Palacz, M., additional, Timár, J., additional, and Valiente-Dobón, J. J., additional

Published
2018
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7. Pseudospin symmetry and microscopic origin of shape coexistence in the 78Ni region: A hint from lifetime measurements

Author

Delafosse, C., Verney, D., Marević, P., Gottardo, A., Michelagnoli, C., Lemasson, A., Goasduff, A., Ljungvall, J., Clément, E., Korichi, A., De Angelis, G., Andreoiu, C., Babo, M., Boso, A., Didierjean, F., Dudouet, J., Franchoo, S., Gadea, A., Georgiev, G., Ibrahim, F., Jacquot, B., Konstantinopoulos, T., Lenzi, S. M., Maquart, G., Matea, I., Mengoni, D., Napoli, D. R., Nikšić, T., Olivier, L., Pérez-Vidal, R. M., Portail, C., Recchia, F., Redon, N., Siciliano, M., Stefan, I., Stezowski, O., Vretenar, D., Zielinska, M., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Cederwall, B., Charles, L., Ciemala, M., Collado, J., Cullen, D. M., Désesquelles, P., De France, G., Domingo-Pardo, C., Eberth, J., González, V., Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Lefevre, A., Legruel, F., Menegazzo, R., Million, B., Nyberg, J., Quintana, B., Ralet, D., Reiter, P., Saillant, F., Sanchis, E., Theisen, Ch., Valiente Dobon, J. J., Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics and Astronomy (all), Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics
Abstract

International audience; Lifetime measurements of excited states of the light $N=52$ isotones $^{88}$Kr, $^{86}$Se, and $^{84}$Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities $B(E2;2^+ \rightarrow 0^+)$ and $B(E2;4^+ \rightarrow 2^+)$ were obtained for the first time for the hard-to-reach $^{84}$Ge. While the $B(E2;2^+ \rightarrow 0^+)$ values of $^{88}$Kr, $^{86}$Se saturate the maximum quadrupole collectivity offered by the natural valence $(3s, 2d, 1g_{7/2}, 1h_{11/2})$ space of an inert $^{78}$Ni core, the value obtained for $^{84}$Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at $N \lesssim 49$, extend beyond $N=50$. The onset of collectivity at $Z=32$ is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector $\rho$ field in shell-structure evolution.

Published
2018

8. Kr369660 –Low- Z Boundary of the Island of Deformation at N=60

Author

Dudouet, J., primary, Lemasson, A., additional, Duchêne, G., additional, Rejmund, M., additional, Clément, E., additional, Michelagnoli, C., additional, Didierjean, F., additional, Korichi, A., additional, Maquart, G., additional, Stezowski, O., additional, Lizarazo, C., additional, Pérez-Vidal, R. M., additional, Andreoiu, C., additional, de Angelis, G., additional, Astier, A., additional, Delafosse, C., additional, Deloncle, I., additional, Dombradi, Z., additional, de France, G., additional, Gadea, A., additional, Gottardo, A., additional, Jacquot, B., additional, Jones, P., additional, Konstantinopoulos, T., additional, Kuti, I., additional, Le Blanc, F., additional, Lenzi, S. M., additional, Li, G., additional, Lozeva, R., additional, Million, B., additional, Napoli, D. R., additional, Navin, A., additional, Petrache, C. M., additional, Pietralla, N., additional, Ralet, D., additional, Ramdhane, M., additional, Redon, N., additional, Schmitt, C., additional, Sohler, D., additional, Verney, D., additional, Barrientos, D., additional, Birkenbach, B., additional, Burrows, I., additional, Charles, L., additional, Collado, J., additional, Cullen, D. M., additional, Désesquelles, P., additional, Domingo Pardo, C., additional, González, V., additional, Harkness-Brennan, L., additional, Hess, H., additional, Judson, D. S., additional, Karolak, M., additional, Korten, W., additional, Labiche, M., additional, Ljungvall, J., additional, Menegazzo, R., additional, Mengoni, D., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Salsac, M. D., additional, Sanchis, E., additional, Theisen, Ch., additional, Valiente-Dobón, J. J., additional, and Zielińska, M., additional

Published
2017
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9. Role of the Δ Resonance in the Population of a Four-Nucleon State in the Fe56→Fe54 Reaction at Relativistic Energies

Author

Podolyák, Zs., primary, Shand, C. M., additional, Lalović, N., additional, Gerl, J., additional, Rudolph, D., additional, Alexander, T., additional, Boutachkov, P., additional, Cortés, M. L., additional, Górska, M., additional, Kojouharov, I., additional, Kurz, N., additional, Louchart, C., additional, Merchán, E., additional, Michelagnoli, C., additional, Pérez-Vidal, R. M., additional, Pietri, S., additional, Ralet, D., additional, Reese, M., additional, Schaffner, H., additional, Stahl, Ch., additional, Weick, H., additional, Ameil, F., additional, de Angelis, G., additional, Arici, T., additional, Carroll, R., additional, Dombrádi, Zs., additional, Gadea, A., additional, Golubev, P., additional, Lettmann, M., additional, Lizarazo, C., additional, Mahboub, D., additional, Pai, H., additional, Patel, Z., additional, Pietralla, N., additional, Regan, P. H., additional, Sarmiento, L. G., additional, Wieland, O., additional, Wilson, E., additional, Birkenbach, B., additional, Bruyneel, B., additional, Burrows, I., additional, Charles, L., additional, Clément, E., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Désesquelles, P., additional, Eberth, J., additional, González, V., additional, Habermann, T., additional, Harkness-Brennan, L., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Korten, W., additional, Labiche, M., additional, Maj, A., additional, Mengoni, D., additional, Napoli, D. R., additional, Pullia, A., additional, Quintana, B., additional, Rainovski, G., additional, Reiter, P., additional, Salsac, M. D., additional, Sanchis, E., additional, and Valiente Dóbon, J. J., additional

Published
2016
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10. Isospin Mixing in ^{80}Zr: From Finite to Zero Temperature

Author

Ceruti, S., Camera, F., Bracco, A., Avigo, R., Benzoni, G., Blasi, N., Bocchi, G., Bottoni, S., Brambilla, S., Crespi, F. C. L., Giaz, A., Leoni, S., Mentana, A., Million, B., Morales, A. I., Nicolini, R., Pellegri, L., Pullia, A., Riboldi, S., Wieland, O., Birkenbach, B., Bazzacco, D., Ciemala, M., Désesquelles, P., Eberth, J., Farnea, E., Görgen, A., Gottardo, A., Hess, H., Judson, D. S., Jungclaus, A., Kmiecik, M., Korten, W., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Modamio, V., Montanari, D., Myalski, S., Napoli, D., Quintana, B., Reiter, P., Recchia, F., Rosso, D., Sahin, E., Salsac, M. D., Söderström, P. -A., Stezowski, O., Theisen, Ch., Ur, C., Valiente-Dobón, J. J., Zieblinski, M., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Univ. Paris-Sud, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], Physics and Astronomy (all), GIANT-DIPOLE RESONANCE, STATES, NUCLEI, SYMMETRY, Nuclear Theory, WIDTH, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, DECAY, BREAKING, RESTORATION
Abstract

International audience; The isospin mixing was deduced in the compound nucleus Zr-80 at an excitation energy of E* = 54 MeV from the gamma decay of the giant dipole resonance. The reaction Ca-40 + Ca-40 at E-beam = 136 MeV was used to form the compound nucleus in the isospin I = 0 channel, while the reaction Cl-37 + Ca-44 at E-beam = 95 MeV was used as the reference reaction. The. rays were detected with the AGATA demonstrator array coupled with LaBr3:Ce detectors. The temperature dependence of the isospin mixing was obtained and the zero-temperature value deduced. The isospin-symmetry-breaking correction delta(C) used for the Fermi superallowed transitions was extracted and found to be consistent with beta-decay data.

Published
2015

11. Superdeformed and Triaxial States inCa42

Author

Hadyńska-Klȩk, K., primary, Napiorkowski, P. J., additional, Zielińska, M., additional, Srebrny, J., additional, Maj, A., additional, Azaiez, F., additional, Valiente Dobón, J. J., additional, Kicińska-Habior, M., additional, Nowacki, F., additional, Naïdja, H., additional, Bounthong, B., additional, Rodríguez, T. R., additional, de Angelis, G., additional, Abraham, T., additional, Anil Kumar, G., additional, Bazzacco, D., additional, Bellato, M., additional, Bortolato, D., additional, Bednarczyk, P., additional, Benzoni, G., additional, Berti, L., additional, Birkenbach, B., additional, Bruyneel, B., additional, Brambilla, S., additional, Camera, F., additional, Chavas, J., additional, Cederwall, B., additional, Charles, L., additional, Ciemała, M., additional, Cocconi, P., additional, Coleman-Smith, P., additional, Colombo, A., additional, Corsi, A., additional, Crespi, F. C. L., additional, Cullen, D. M., additional, Czermak, A., additional, Désesquelles, P., additional, Doherty, D. T., additional, Dulny, B., additional, Eberth, J., additional, Farnea, E., additional, Fornal, B., additional, Franchoo, S., additional, Gadea, A., additional, Giaz, A., additional, Gottardo, A., additional, Grave, X., additional, Grȩbosz, J., additional, Görgen, A., additional, Gulmini, M., additional, Habermann, T., additional, Hess, H., additional, Isocrate, R., additional, Iwanicki, J., additional, Jaworski, G., additional, Judson, D. S., additional, Jungclaus, A., additional, Karkour, N., additional, Kmiecik, M., additional, Karpiński, D., additional, Kisieliński, M., additional, Kondratyev, N., additional, Korichi, A., additional, Komorowska, M., additional, Kowalczyk, M., additional, Korten, W., additional, Krzysiek, M., additional, Lehaut, G., additional, Leoni, S., additional, Ljungvall, J., additional, Lopez-Martens, A., additional, Lunardi, S., additional, Maron, G., additional, Mazurek, K., additional, Menegazzo, R., additional, Mengoni, D., additional, Merchán, E., additional, Mȩczyński, W., additional, Michelagnoli, C., additional, Mierzejewski, J., additional, Million, B., additional, Myalski, S., additional, Napoli, D. R., additional, Nicolini, R., additional, Niikura, M., additional, Obertelli, A., additional, Özmen, S. F., additional, Palacz, M., additional, Próchniak, L., additional, Pullia, A., additional, Quintana, B., additional, Rampazzo, G., additional, Recchia, F., additional, Redon, N., additional, Reiter, P., additional, Rosso, D., additional, Rusek, K., additional, Sahin, E., additional, Salsac, M.-D., additional, Söderström, P.-A., additional, Stefan, I., additional, Stézowski, O., additional, Styczeń, J., additional, Theisen, Ch., additional, Toniolo, N., additional, Ur, C. A., additional, Vandone, V., additional, Wadsworth, R., additional, Wasilewska, B., additional, Wiens, A., additional, Wood, J. L., additional, Wrzosek-Lipska, K., additional, and Ziȩbliński, M., additional

Published
2016
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12. Isospin Mixing inZr80: From Finite to Zero Temperature

Author

Ceruti, S., primary, Camera, F., additional, Bracco, A., additional, Avigo, R., additional, Benzoni, G., additional, Blasi, N., additional, Bocchi, G., additional, Bottoni, S., additional, Brambilla, S., additional, Crespi, F. C. L., additional, Giaz, A., additional, Leoni, S., additional, Mentana, A., additional, Million, B., additional, Morales, A. I., additional, Nicolini, R., additional, Pellegri, L., additional, Pullia, A., additional, Riboldi, S., additional, Wieland, O., additional, Birkenbach, B., additional, Bazzacco, D., additional, Ciemala, M., additional, Désesquelles, P., additional, Eberth, J., additional, Farnea, E., additional, Görgen, A., additional, Gottardo, A., additional, Hess, H., additional, Judson, D. S., additional, Jungclaus, A., additional, Kmiecik, M., additional, Korten, W., additional, Maj, A., additional, Menegazzo, R., additional, Mengoni, D., additional, Michelagnoli, C., additional, Modamio, V., additional, Montanari, D., additional, Myalski, S., additional, Napoli, D., additional, Quintana, B., additional, Reiter, P., additional, Recchia, F., additional, Rosso, D., additional, Sahin, E., additional, Salsac, M. D., additional, Söderström, P.-A., additional, Stezowski, O., additional, Theisen, Ch., additional, Ur, C., additional, Valiente-Dobón, J. J., additional, and Zieblinski, M., additional

Published
2015
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13. Quadrupole Transition Strength in theNi74Nucleus and Core Polarization Effects in the Neutron-Rich Ni Isotopes

Author

Marchi, T., primary, de Angelis, G., additional, Valiente-Dobón, J. J., additional, Bader, V. M., additional, Baugher, T., additional, Bazin, D., additional, Berryman, J., additional, Bonaccorso, A., additional, Clark, R., additional, Coraggio, L., additional, Crawford, H. L., additional, Doncel, M., additional, Farnea, E., additional, Gade, A., additional, Gadea, A., additional, Gargano, A., additional, Glasmacher, T., additional, Gottardo, A., additional, Gramegna, F., additional, Itaco, N., additional, John, P. R., additional, Kumar, R., additional, Lenzi, S. M., additional, Lunardi, S., additional, McDaniel, S., additional, Michelagnoli, C., additional, Mengoni, D., additional, Modamio, V., additional, Napoli, D. R., additional, Quintana, B., additional, Ratkiewicz, A., additional, Recchia, F., additional, Sahin, E., additional, Stroberg, R., additional, Weisshaar, D., additional, Wimmer, K., additional, and Winkler, R., additional

Published
2014
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14. Neutron Pair Transfer inNi60+Sn116Far below the Coulomb Barrier

Author

Montanari, D., primary, Corradi, L., additional, Szilner, S., additional, Pollarolo, G., additional, Fioretto, E., additional, Montagnoli, G., additional, Scarlassara, F., additional, Stefanini, A. M., additional, Courtin, S., additional, Goasduff, A., additional, Haas, F., additional, Jelavić Malenica, D., additional, Michelagnoli, C., additional, Mijatović, T., additional, Soić, N., additional, Ur, C. A., additional, and Varga Pajtler, M., additional

Published
2014
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15. Isospin Character of Low-Lying Pygmy Dipole States inPb208via Inelastic Scattering ofO17Ions

Author

Crespi, F. C. L., primary, Bracco, A., additional, Nicolini, R., additional, Mengoni, D., additional, Pellegri, L., additional, Lanza, E. G., additional, Leoni, S., additional, Maj, A., additional, Kmiecik, M., additional, Avigo, R., additional, Benzoni, G., additional, Blasi, N., additional, Boiano, C., additional, Bottoni, S., additional, Brambilla, S., additional, Camera, F., additional, Ceruti, S., additional, Giaz, A., additional, Million, B., additional, Morales, A. I., additional, Vandone, V., additional, Wieland, O., additional, Bednarczyk, P., additional, Ciemała, M., additional, Grebosz, J., additional, Krzysiek, M., additional, Mazurek, K., additional, Zieblinski, M., additional, Bazzacco, D., additional, Bellato, M., additional, Birkenbach, B., additional, Bortolato, D., additional, Calore, E., additional, Cederwall, B., additional, Charles, L., additional, de Angelis, G., additional, Désesquelles, P., additional, Eberth, J., additional, Farnea, E., additional, Gadea, A., additional, Görgen, A., additional, Gottardo, A., additional, Isocrate, R., additional, Jolie, J., additional, Jungclaus, A., additional, Karkour, N., additional, Korten, W., additional, Menegazzo, R., additional, Michelagnoli, C., additional, Molini, P., additional, Napoli, D. R., additional, Pullia, A., additional, Recchia, F., additional, Reiter, P., additional, Rosso, D., additional, Sahin, E., additional, Salsac, M. D., additional, Siebeck, B., additional, Siem, S., additional, Simpson, J., additional, Söderström, P.-A., additional, Stezowski, O., additional, Theisen, Ch., additional, Ur, C., additional, and Valiente-Dobón, J. J., additional

Published
2014
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17. Shape Coexistence at Zero Spin in Ni 64 Driven by the Monopole Tensor Interaction

Author

Mărginean, N., Little, D., Tsunoda, Y., Leoni, S., Janssens, R. V. F., Fornal, B., Otsuka, T., Michelagnoli, C., Stan, L., Crespi, F. C. L., Costache, C., Lica, R., Sferrazza, M., Turturica, A., Ayangeakaa, A. D., Auranen, K., Barani, M., Bender, P. C., Bottoni, S., Boromiza, M., Bracco, A., Călinescu, S., Campbell, C. M., Carpenter, M. P., Chowdhury, P., Ciemała, M., Cieplicka-Oryǹczak, N., Cline, D., Clisu, C., Crawford, H. L., Dinescu, I. E., Dudouet, J., Filipescu, D., Florea, N., Forney, A. M., Fracassetti, S., Gade, A., Gheorghe, I., Hayes, A. B., Harca, I., Henderson, J., Ionescu, A., Iskra, Ł. W., Jentschel, M., Kandzia, F., Kim, Y. H., Kondev, F. G., Korschinek, G., Köster, U., Krishichayan, Krzysiek, M., Lauritsen, T., Li, J., Mărginean, R., Maugeri, E. A., Mihai, C., Mihai, R. E., Mitu, A., Mutti, P., Negret, A., Niţă, C. R., Olăcel, A., Oprea, A., Pascu, S., Petrone, C., Porzio, C., Rhodes, D., Seweryniak, D., Schumann, D., Sotty, C., Stolze, S. M., Şuvăilă, R., Toma, S., Ujeniuc, S., Walters, W. B., Wu, C. Y., Wu, J., Zhu, S., and Ziliani, S.

Abstract

The low-spin structure of the semimagic Ni64 nucleus has been considerably expanded: combining four experiments, several 0+ and 2+ excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0+ excitation is located at a surprisingly high energy (3463 keV), with a collective 2+ state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.

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18. Neutron Pair Transfer in 60Ni+116Sn Far below the Coulomb Barrier.

Author

Montanari, D., Corradi, L., Szilner, S., Pollarolo, G., Fioretto, E., Montagnoli, G., Scarlassara, F., Stefanini, A. M., Courtin, S., Goasduff, A., Haas, F., Jelavić Malenica, D., Michelagnoli, C., Mijatović, T., Soić, N., Ur, C. A., and Varga Pajtler, M.

Subjects
*COULOMB barriers (Nuclear fusion), *PAIRING correlations (Nuclear physics), *PAIR production, *HEAVY ions, *MAGNETIC spectrometer
Abstract

An excitation function of one- and two-neutron transfer channels for the 60Ni+116Sn system has been measured with the magnetic spectrometer PRISMA in a wide energy range, from the Coulomb barrier to far below it. The experimental transfer probabilities are well reproduced, for the first time with heavy ions, in absolute values and in slope by microscopic calculations which incorporate nucleon-nucleon pairing correlations. [ABSTRACT FROM AUTHOR]

Published
2014
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19. High-Precision Spectroscopy of ^{20}O Benchmarking Ab Initio Calculations in Light Nuclei.

Author

Zanon I, Clément E, Goasduff A, Menéndez J, Miyagi T, Assié M, Ciemała M, Flavigny F, Lemasson A, Matta A, Ramos D, Rejmund M, Achouri L, Ackermann D, Barrientos D, Beaumel D, Benzoni G, Boston AJ, Boston HC, Bottoni S, Bracco A, Brugnara D, de France G, de Sereville N, Delaunay F, Desesquelles P, Didierjean F, Domingo-Prato C, Dudouet J, Eberth J, Fernández D, Fougères C, Gadea A, Galtarossa F, Girard-Alcindor V, Gonzales V, Gottardo A, Hammache F, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Kaşkaş A, Kim YH, Kuşoğlu A, Labiche M, Leblond S, Lenain C, Lenzi SM, Leoni S, Li H, Ljungvall J, Lois-Fuentes J, Lopez-Martens A, Maj A, Menegazzo R, Mengoni D, Michelagnoli C, Million B, Napoli DR, Nyberg J, Pasqualato G, Podolyak Z, Pullia A, Quintana B, Recchia F, Regueira-Castro D, Reiter P, Rezynkina K, Rojo JS, Salsac MD, Sanchis E, Şenyiğit M, Siciliano M, Sohler D, Stezowski O, Theisen C, Utepov A, Valiente-Dobón JJ, Verney D, and Zielinska M

Abstract

The excited states of unstable ^{20}O were investigated via γ-ray spectroscopy following the ^{19}O(d,p)^{20}O reaction at 8  AMeV. By exploiting the Doppler shift attenuation method, the lifetimes of the 2_{2}^{+} and 3_{1}^{+} states were firmly established. From the γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 2_{2}^{+} and 3_{1}^{+} states, the B(E2) and B(M1) were determined. Various chiral effective field theory Hamiltonians, describing the nuclear properties beyond ground states, along with a standard USDB interaction, were compared with the experimentally obtained data. Such a comparison for a large set of γ-ray transition probabilities with the valence space in medium similarity renormalization group ab initio calculations was performed for the first time in a nucleus far from stability. It was shown that the ab initio approaches using chiral effective field theory forces are challenged by detailed high-precision spectroscopic properties of nuclei. The reduced transition probabilities were found to be a very constraining test of the performance of the ab initio models.

Published
2023
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20. Shape Coexistence at Zero Spin in ^{64}Ni Driven by the Monopole Tensor Interaction.

Author

Mărginean N, Little D, Tsunoda Y, Leoni S, Janssens RVF, Fornal B, Otsuka T, Michelagnoli C, Stan L, Crespi FCL, Costache C, Lica R, Sferrazza M, Turturica A, Ayangeakaa AD, Auranen K, Barani M, Bender PC, Bottoni S, Boromiza M, Bracco A, Călinescu S, Campbell CM, Carpenter MP, Chowdhury P, Ciemała M, Cieplicka-Oryǹczak N, Cline D, Clisu C, Crawford HL, Dinescu IE, Dudouet J, Filipescu D, Florea N, Forney AM, Fracassetti S, Gade A, Gheorghe I, Hayes AB, Harca I, Henderson J, Ionescu A, Iskra ŁW, Jentschel M, Kandzia F, Kim YH, Kondev FG, Korschinek G, Köster U, Krishichayan, Krzysiek M, Lauritsen T, Li J, Mărginean R, Maugeri EA, Mihai C, Mihai RE, Mitu A, Mutti P, Negret A, Niţă CR, Olăcel A, Oprea A, Pascu S, Petrone C, Porzio C, Rhodes D, Seweryniak D, Schumann D, Sotty C, Stolze SM, Şuvăilă R, Toma S, Ujeniuc S, Walters WB, Wu CY, Wu J, Zhu S, and Ziliani S

Abstract

The low-spin structure of the semimagic ^{64}Ni nucleus has been considerably expanded: combining four experiments, several 0^{+} and 2^{+} excited states were identified below 4.5 MeV, and their properties established. The Monte Carlo shell model accounts for the results and unveils an unexpectedly complex landscape of coexisting shapes: a prolate 0^{+} excitation is located at a surprisingly high energy (3463 keV), with a collective 2^{+} state 286 keV above it, the first such observation in Ni isotopes. The evolution in excitation energy of the prolate minimum across the neutron N=40 subshell gap highlights the impact of the monopole interaction and its variation in strength with N.

Published
2020
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21. Pseudospin Symmetry and Microscopic Origin of Shape Coexistence in the ^{78}Ni Region: A Hint from Lifetime Measurements.

Author

Delafosse C, Verney D, Marević P, Gottardo A, Michelagnoli C, Lemasson A, Goasduff A, Ljungvall J, Clément E, Korichi A, De Angelis G, Andreoiu C, Babo M, Boso A, Didierjean F, Dudouet J, Franchoo S, Gadea A, Georgiev G, Ibrahim F, Jacquot B, Konstantinopoulos T, Lenzi SM, Maquart G, Matea I, Mengoni D, Napoli DR, Nikšić T, Olivier L, Pérez-Vidal RM, Portail C, Recchia F, Redon N, Siciliano M, Stefan I, Stezowski O, Vretenar D, Zielinska M, Barrientos D, Benzoni G, Birkenbach B, Boston AJ, Boston HC, Cederwall B, Charles L, Ciemala M, Collado J, Cullen DM, Désesquelles P, de France G, Domingo-Pardo C, Eberth J, González V, Harkness-Brennan LJ, Hess H, Judson DS, Jungclaus A, Korten W, Lefevre A, Legruel F, Menegazzo R, Million B, Nyberg J, Quintana B, Ralet D, Reiter P, Saillant F, Sanchis E, Theisen C, and Valiente Dobon JJ

Abstract

Lifetime measurements of excited states of the light N=52 isotones ^{88}Kr, ^{86}Se, and ^{84}Ge have been performed, using the recoil distance Doppler shift method and VAMOS and AGATA spectrometers for particle identification and gamma spectroscopy, respectively. The reduced electric quadrupole transition probabilities B(E2;2^{+}→0^{+}) and B(E2;4^{+}→2^{+}) were obtained for the first time for the hard-to-reach ^{84}Ge. While the B(E2;2^{+}→0^{+}) values of ^{88}Kr, ^{86}Se saturate the maximum quadrupole collectivity offered by the natural valence (3s, 2d, 1g_{7/2}, 1h_{11/2}) space of an inert ^{78}Ni core, the value obtained for ^{84}Ge largely exceeds it, suggesting that shape coexistence phenomena, previously reported at N≲49, extend beyond N=50. The onset of collectivity at Z=32 is understood as due to a pseudo-SU(3) organization of the proton single-particle sequence reflecting a clear manifestation of pseudospin symmetry. It is realized that the latter provides actually reliable guidance for understanding the observed proton and neutron single particle structure in the whole medium-mass region, from Ni to Sn, pointing towards the important role of the isovector-vector ρ field in shell-structure evolution.

Published
2018
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22. Evidence for Coexisting Shapes through Lifetime Measurements in ^{98}Zr.

Author

Singh P, Korten W, Hagen TW, Görgen A, Grente L, Salsac MD, Farget F, Clément E, de France G, Braunroth T, Bruyneel B, Celikovic I, Delaune O, Dewald A, Dijon A, Delaroche JP, Girod M, Hackstein M, Jacquot B, Libert J, Litzinger J, Ljungvall J, Louchart C, Gottardo A, Michelagnoli C, Müller-Gatermann C, Napoli DR, Otsuka T, Pillet N, Recchia F, Rother W, Sahin E, Siem S, Sulignano B, Togashi T, Tsunoda Y, Theisen C, and Valiente-Dobon JJ

Abstract

The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr were populated using the fission reaction between a 6.2  MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.

Published
2018
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23. Neutron Skin Effects in Mirror Energy Differences: The Case of ^{23}Mg-^{23}Na.

Author

Boso A, Lenzi SM, Recchia F, Bonnard J, Zuker AP, Aydin S, Bentley MA, Cederwall B, Clement E, de France G, Di Nitto A, Dijon A, Doncel M, Ghazi-Moradi F, Gadea A, Gottardo A, Henry T, Hüyük T, Jaworski G, John PR, Juhász K, Kuti I, Melon B, Mengoni D, Michelagnoli C, Modamio V, Napoli DR, Nyakó BM, Nyberg J, Palacz M, Timár J, and Valiente-Dobón JJ

Abstract

Energy differences between analogue states in the T=1/2 ^{23}Mg-^{23}Na mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetry-breaking interactions (ISB) and/or shape changes. Data are interpreted in the shell model framework following the method successfully applied to nuclei in the f_{7/2} shell. It is shown that the introduction of a schematic ISB interaction of the same type of that used in the f_{7/2} shell is needed to reproduce the data. An alternative novel description, applied here for the first time, relies on the use of an effective interaction deduced from a realistic charge-dependent chiral nucleon-nucleon potential. This analysis provides two important results: (i) The mirror energy differences give direct insight into the nuclear skin; (ii) the skin changes along the rotational bands are strongly correlated with the difference between the neutron and proton occupations of the s_{1/2} "halo" orbit.

Published
2018
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24. _{36}^{96}Kr_{60}-Low-Z Boundary of the Island of Deformation at N=60.

Author

Dudouet J, Lemasson A, Duchêne G, Rejmund M, Clément E, Michelagnoli C, Didierjean F, Korichi A, Maquart G, Stezowski O, Lizarazo C, Pérez-Vidal RM, Andreoiu C, de Angelis G, Astier A, Delafosse C, Deloncle I, Dombradi Z, de France G, Gadea A, Gottardo A, Jacquot B, Jones P, Konstantinopoulos T, Kuti I, Le Blanc F, Lenzi SM, Li G, Lozeva R, Million B, Napoli DR, Navin A, Petrache CM, Pietralla N, Ralet D, Ramdhane M, Redon N, Schmitt C, Sohler D, Verney D, Barrientos D, Birkenbach B, Burrows I, Charles L, Collado J, Cullen DM, Désesquelles P, Domingo Pardo C, González V, Harkness-Brennan L, Hess H, Judson DS, Karolak M, Korten W, Labiche M, Ljungvall J, Menegazzo R, Mengoni D, Pullia A, Recchia F, Reiter P, Salsac MD, Sanchis E, Theisen C, Valiente-Dobón JJ, and Zielińska M

Abstract

Prompt γ-ray spectroscopy of the neutron-rich ^{96}Kr, produced in transfer- and fusion-induced fission reactions, has been performed using the combination of the Advanced Gamma Tracking Array and the VAMOS++ spectrometer. A second excited state, assigned to J^{π}=4^{+}, is observed for the first time, and a previously reported level energy of the first 2^{+} excited state is confirmed. The measured energy ratio R_{4/2}=E(4^{+})/E(2^{+})=2.12(1) indicates that this nucleus does not show a well-developed collectivity contrary to that seen in heavier N=60 isotones. This new measurement highlights an abrupt transition of the degree of collectivity as a function of the proton number at Z=36, of similar amplitude to that observed at N=60 at higher Z values. A possible reason for this abrupt transition could be related to the insufficient proton excitations in the g_{9/2}, d_{5/2}, and s_{1/2} orbitals to generate strong quadrupole correlations or to the coexistence of competing different shapes. An unexpected continuous decrease of R_{4/2} as a function of the neutron number up to N=60 is also evidenced. This measurement establishes the Kr isotopic chain as the low-Z boundary of the island of deformation for N=60 isotones. A comparison with available theoretical predictions using different beyond mean-field approaches shows that these models fail to reproduce the abrupt transitions at N=60 and Z=36.

Published
2017
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25. Role of the Δ Resonance in the Population of a Four-Nucleon State in the ^{56}Fe→^{54}Fe Reaction at Relativistic Energies.

Author

Podolyák Z, Shand CM, Lalović N, Gerl J, Rudolph D, Alexander T, Boutachkov P, Cortés ML, Górska M, Kojouharov I, Kurz N, Louchart C, Merchán E, Michelagnoli C, Pérez-Vidal RM, Pietri S, Ralet D, Reese M, Schaffner H, Stahl C, Weick H, Ameil F, de Angelis G, Arici T, Carroll R, Dombrádi Z, Gadea A, Golubev P, Lettmann M, Lizarazo C, Mahboub D, Pai H, Patel Z, Pietralla N, Regan PH, Sarmiento LG, Wieland O, Wilson E, Birkenbach B, Bruyneel B, Burrows I, Charles L, Clément E, Crespi FC, Cullen DM, Désesquelles P, Eberth J, González V, Habermann T, Harkness-Brennan L, Hess H, Judson DS, Jungclaus A, Korten W, Labiche M, Maj A, Mengoni D, Napoli DR, Pullia A, Quintana B, Rainovski G, Reiter P, Salsac MD, Sanchis E, and Valiente Dóbon JJ

Abstract

The ^{54}Fe nucleus was populated from a ^{56}Fe beam impinging on a Be target with an energy of E/A=500  MeV. The internal decay via γ-ray emission of the 10^{+} metastable state was observed. As the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the ^{56}Fe ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of ^{54}Fe, suggesting that it was populated via the decay of the Δ^{0} resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10^{+} metastable state in ^{54}Fe is a consequence of the quark structure of the nucleons.

Published
2016
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26. Quadrupole transition strength in the (74)Ni nucleus and core polarization effects in the neutron-rich Ni isotopes.

Author

Marchi T, de Angelis G, Valiente-Dobón JJ, Bader VM, Baugher T, Bazin D, Berryman J, Bonaccorso A, Clark R, Coraggio L, Crawford HL, Doncel M, Farnea E, Gade A, Gadea A, Gargano A, Glasmacher T, Gottardo A, Gramegna F, Itaco N, John PR, Kumar R, Lenzi SM, Lunardi S, McDaniel S, Michelagnoli C, Mengoni D, Modamio V, Napoli DR, Quintana B, Ratkiewicz A, Recchia F, Sahin E, Stroberg R, Weisshaar D, Wimmer K, and Winkler R

Abstract

The reduced transition probability B(E2;0(+)→2(+)) has been measured for the neutron-rich nucleus (74)Ni in an intermediate energy Coulomb excitation experiment performed at the National Superconducting Cyclotron Laboratory at Michigan State University. The obtained B(E2;0(+)→2(+))=642(-226)(+216)  e(2) fm(4) value defines a trend which is unexpectedly small if referred to (70)Ni and to a previous indirect determination of the transition strength in (74)Ni. This indicates a reduced polarization of the Z=28 core by the valence neutrons. Calculations in the pfgd model space reproduce well the experimental result indicating that the B(E2) strength predominantly corresponds to neutron excitations. The ratio of the neutron and proton multipole matrix elements supports such an interpretation.

Published
2014
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27. Neutron pair transfer in (60)Ni+(116)Sn far below the Coulomb barrier.

Author

Montanari D, Corradi L, Szilner S, Pollarolo G, Fioretto E, Montagnoli G, Scarlassara F, Stefanini AM, Courtin S, Goasduff A, Haas F, Jelavić Malenica D, Michelagnoli C, Mijatović T, Soić N, Ur CA, and Varga Pajtler M

Abstract

An excitation function of one- and two-neutron transfer channels for the ^{60}Ni+^{116}Sn system has been measured with the magnetic spectrometer PRISMA in a wide energy range, from the Coulomb barrier to far below it. The experimental transfer probabilities are well reproduced, for the first time with heavy ions, in absolute values and in slope by microscopic calculations which incorporate nucleon-nucleon pairing correlations.

Published
2014
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28. Isospin character of low-lying pygmy dipole states in 208Pb via inelastic scattering of 17O ions.

Author

Crespi FC, Bracco A, Nicolini R, Mengoni D, Pellegri L, Lanza EG, Leoni S, Maj A, Kmiecik M, Avigo R, Benzoni G, Blasi N, Boiano C, Bottoni S, Brambilla S, Camera F, Ceruti S, Giaz A, Million B, Morales AI, Vandone V, Wieland O, Bednarczyk P, Ciemała M, Grebosz J, Krzysiek M, Mazurek K, Zieblinski M, Bazzacco D, Bellato M, Birkenbach B, Bortolato D, Calore E, Cederwall B, Charles L, de Angelis G, Désesquelles P, Eberth J, Farnea E, Gadea A, Görgen A, Gottardo A, Isocrate R, Jolie J, Jungclaus A, Karkour N, Korten W, Menegazzo R, Michelagnoli C, Molini P, Napoli DR, Pullia A, Recchia F, Reiter P, Rosso D, Sahin E, Salsac MD, Siebeck B, Siem S, Simpson J, Söderström PA, Stezowski O, Theisen Ch, Ur C, and Valiente-Dobón JJ

Abstract

The properties of pygmy dipole states in 208Pb were investigated using the 208Pb(17O, 17O'γ) reaction at 340 MeV and measuring the γ decay with high resolution with the AGATA demonstrator array. Cross sections and angular distributions of the emitted γ rays and of the scattered particles were measured. The results are compared with (γ, γ') and (p, p') data. The data analysis with the distorted wave Born approximation approach gives a good description of the elastic scattering and of the inelastic excitation of the 2+ and 3- states. For the dipole transitions a form factor obtained by folding a microscopically calculated transition density was used for the first time. This has allowed us to extract the isoscalar component of the 1- excited states from 4 to 8 MeV.

Published
2014
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