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891 results on '"Michelagnoli C."'

101. Lifetime measurements of states of 35S, 36S, 37S, and 38S using the AGATA γ-ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Capponi, L., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatović, Tea, Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, Suzana, and Valiente-Dobon, J. J.

Subjects
nuclear structure, lifetimes, shell model
Abstract

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A=35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV ; the result is compared with a previous published lifetime value. The lifetime of the 3− state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV ; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ=3/2− and at 2776 keV with Jπ=11/2− ; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ=(6+) state of 38S at 3675 keV ; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics ; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.

Published
2022

102. Lifetime measurements of states of S 35, S 36, S 37, and S 38 using the AGATA γ -ray tracking spectrometer

Author

Grocutt, L., Chapman, R., Bouhelal, M., Haas, F., Goasduff, A., Smith, J. F., Lubna, R. S., Courtin, S., Bazzacco, D., Braunroth, T., Corradi, L., Derkx, X., Desesquelles, P., Doncel, M., Fioretto, E., Gottardo, A., Liberati, V., Melon, B., Mengoni, D., Michelagnoli, C., Mijatovic, T., Modamio, V., Montagnoli, G., Montanari, D., Mulholland, K. F., Napoli, D. R., Petrache, C. M., Pipidis, A., Recchia, F., Sahin, E., Singh, P. P., Stefanini, A. M., Szilner, S., Valiente-Dobon, J. J., and Capponi, L.

Abstract

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers A=35, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated by a beam of 36S ions of energy 225 MeV incident on a thin 208Pb target which was mounted in the Cologne plunger apparatus. The combination of the PRISMA magnetic spectrometer and an early implementation of the AGATA γ-ray tracking array was used to detect γ rays in coincidence with projectile-like nuclear species. Lifetime measurements of populated states were measured within the range from about 1 to 100 ps. The number of states for which lifetime measurements or lifetime limits were possible was limited by statistics. For 35S, the lifetime was determined for the first 1/2+ state at 1572 keV; the result is compared with a previous published lifetime value. The lifetime of the 3− state of 36S at 4193 keV was determined and compared with earlier measurements. No previous lifetime information exists for the (6+) state at 6690 keV; a lifetime measurement with large associated error was made in the present work. For 37S, the states for which lifetime limits were established were those at 646 keV with Jπ=3/2− and at 2776 keV with Jπ=11/2−; there are no previously published lifetime values for excited states of 37S. Finally, a lifetime limit was established for the Jπ=(6+) state of 38S at 3675 keV; no lifetime information exists for this state in the literature. Measured lifetime values were compared with the results of state-of-the-art shell-model calculations based on the PSDPF, SDPF-U, and FSU effective interactions. In addition, nuclear magnetic-dipole and electric-quadrupole moments, branching ratios, mixing ratios, and electromagnetic transition rates, where available, have been compared with shell-model values. The current work suffers from poor statistics; nevertheless, lifetime values and limits have been possible, allowing a useful discussion of the ability of state-of-the-art shell-model calculations to reproduce the experimental results.

Published
2022

103. Structure of <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>83</mn></mmultiscripts><mo>,</mo></math> <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>85</mn></mmultiscripts><mo>,</mo></math> and <math><mmultiscripts><mi>As</mi><mprescripts/><none/><mn>87</mn></mmultiscripts></math>: From semimagicity to <math><mi>γ</mi></math> softness

Author

Rezynkina, K., Dao, D.D., Duchene, G., Dudouet, J., Nowacki, F., Clément, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S.M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D.R., Navin, A., Perez-Vidal, R.M., Petrache, C.M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., Verney, D., Institut Pluridisciplinaire Hubert Curien (IPHC), 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), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), 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), Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), and Université Grenoble Alpes (UGA)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; The structure of As83, As85, and As87 have been studied in fusion-fission reaction U238+Be9. Fission fragments were identified in mass and atomic number using the VAMOS++ spectrometer and the coincident γ rays were detected in the γ-ray tracking array AGATA. New transitions in As83 and As85 are reported and placed in the level schemes. A level scheme of the excited states in As87 is proposed for the first time. The data are interpreted in frame of large-scale shell-model calculations, SU3 symmetries, and beyond mean-field frameworks. A spherical regime at magic number N=50 is predicted and the location of the proton g9/2 orbital is proposed for the first time. Development of collectivity in a prolate deformed, γ-soft regime in the open shell cases As85 and As87, most neutron-rich isotopes beyond N=50, is concluded. Data and theoretical calculations give confidence to a relatively high extrapolated excitation energy about 4 MeV of the 9/2+ state in Cu79, one proton above Ni78.

Published
2022

104. Structure of 83As, 85As, and 87As : From semimagicity to gamma softness

Author

Rezynkina, K., Dao, D. D., Duchene, G., Dudouet, J., Nowacki, F., Clement, E., Lemasson, A., Andreoiu, C., Astier, A., de Angelis, G., de France, G., Delafosse, C., Deloncle, I., Didierjean, F., Dombradi, Z., Ducoin, C., Gadea, A., Gottardo, A., Guinet, D., Jacquot, B., Jones, P., Konstantinopoulos, T., Kuti, I., Korichi, A., Lenzi, S. M., Li, G., Le Blanc, F., Lizarazo, C., Lozeva, R., Maquart, G., Million, B., Michelagnoli, C., Napoli, D. R., Navin, A., Perez-Vidal, R. M., Petrache, C. M., Pietralla, N., Ralet, D., Ramdhane, M., Rejmund, M., Stezowski, O., Schmitt, C., Sohler, D., and Verney, D.

Published
2022

105. Complete set of bound negative-parity states in the neutron-rich nucleus

Author

Ziliani S., Ciemala M., Crespi F. C. L., Leoni S., Fornal B., Suzuki T., Otsuka T., Maj A., Bednarczyk P., Benzoni G., Bracco A., Boiano C., Bottoni S., Brambilla S., Bast M., Beckers M., Braunroth T., Camera F., Cieplicka-Orynczak N., Clement E., Coelli S., Dorvaux O., Erturk S., de France G., Fransen C., Goldkuhle A., Grebosz J., Harakeh M. N., Iskra L. W., Jacquot B., Karpov A., Kicinska-Habior M., Kim Y., Kmiecik M., Lemasson A., Lenzi S. M., Lewitowicz M., Li H., Matea I., Mazurek K., Michelagnoli C., Matejska-Minda M., Million B., Muller-Gatermann C., Nanal V., Napiorkowski P., Napoli D. R., Palit R., Rejmund M., Schmitt CH., Stanoiu M., Stefan I., Vardaci E., Wasilewska B., Wieland O., Zieblinski M., Zielinska M., Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Suzuki, T., Otsuka, T., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., and Zielinska, M.

Abstract

High-resolution -ray spectroscopy of is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an beam on a target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the and excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in and , for the first time. Understanding the structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

Published
2021

106. 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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107. 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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108. Lifetime analysis of short-lived states in $^{17}$N

Author

Ziliani, S., Ciemała, M., Crespi, F. C.L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Oryńczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grȩbosz, J., Harakeh, M. N., Iskra, W., Jacquot, B., Karpov, A., Kicińska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Müller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, C., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Ziȩbliński, M., Zielińska, M., Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, C., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., and Research unit Nuclear & Hadron Physics

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; A recent extension of the Doppler-shift attenuation method to measure short lifetimes of states populated in low-energy binary reactions is applied to the case of 17N. The reliability of the technique is confirmed by measuring the lifetime of the 5515 keV 3/2− state, which is depopulated by two different γ rays. The method is used to measure the lifetime of the 5170 keV (9/2+) state in the same nucleus. Comparisons with large-scale shell-model predictions are given as well.

Published
2020

109. Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2+ state in C 16 and O 20

Author

Ciemala, M., Ziliani, S., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, C., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Atac, A., Barrientos, D., Birkenbach, B., Boston, A. J., Cederwall, B., Charles, L., Collado, J., Cullen, D. M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Gonzalez, V., Goupil, J., Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Nyberg, J., Perez-Vidal, R. M., Podolyak, Z., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, C., Valiente-Dobon, J. J., Holt, J. D., Menendez, J., Schwenk, A., Simonis, J., Ciemala, M., Ziliani, S., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, C., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Atac, A., Barrientos, D., Birkenbach, B., Boston, A. J., Cederwall, B., Charles, L., Collado, J., Cullen, D. M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Gonzalez, V., Goupil, J., Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Nyberg, J., Perez-Vidal, R. M., Podolyak, Z., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, C., Valiente-Dobon, J. J., Holt, J. D., Menendez, J., Schwenk, A., and Simonis, J.

Abstract

To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich O20,τ(22+)=150-30+80fs, and an estimate for the lifetime of the second 2+ state in C16 have been obtained for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds of femtoseconds range by analyzing the Doppler-shifted γ-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction O18(7.0MeV/u)+Ta181. The requested sensitivity could only be reached owing to the excellent performances of the Advanced γ-Tracking Array AGATA, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two-and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for O20 and with the no-core shell model for C16. The present measurement shows the power of electromagnetic observables, determined with high-precision γ spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetime measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense beams, produced by Isotope Separation On-Line (ISOL) techniques, become available.

Published
2020

110. Reinterpretation of excited states in Po212 : Shell-model multiplets rather than α -cluster states

Author

Fernández, A., primary, Jungclaus, A., additional, Golubev, P., additional, Rudolph, D., additional, Sarmiento, L. G., additional, Gargano, A., additional, Naïdja, H., additional, Astier, A., additional, Dupont, E., additional, Gadea, A., additional, Nácher, E., additional, Perea, A., additional, Wimmer, K., additional, Clément, E., additional, Fremont, G., additional, Goupil, J., additional, Houarner, C., additional, Jacquot, B., additional, Korichi, A., additional, Lemasson, A., additional, Li, H. J., additional, Ljungvall, J., additional, Ménager, L., additional, Pérez-Vidal, R. M., additional, Petrache, C. M., additional, Ralet, D., additional, Ropert, J. A., additional, Saillant, F., additional, Såmark-Roth, A., additional, Simpson, G. S., additional, Spitaels, C., additional, Zielinska, M., additional, Ansari, S., additional, Dudouet, J., additional, Illana, A., additional, Jurado, M., additional, Kocheva, D., additional, Lalović, N., additional, Lorenz, Ch., additional, Quintana, B., additional, Rainovski, G., additional, Redon, N., additional, Tocabens, G., additional, Barrientos, D., additional, Benzoni, G., additional, Birkenbach, B., additional, Boston, A. J., additional, Boston, H. C., additional, Bracco, A., additional, Ciemala, M., additional, Collado, J., additional, Cullen, D. M., additional, Domingo-Pardo, C., additional, Eberth, J., additional, González, V., additional, Harkness-Brennan, L. J., additional, Hess, H., additional, Judson, D. S., additional, Korten, W., additional, Leoni, S., additional, Maj, A., additional, Menegazzo, R., additional, Mengoni, D., additional, Michelagnoli, C., additional, Million, B., additional, Napoli, D. R., additional, Nyberg, J., additional, Podolyak, Zs., additional, Pullia, A., additional, Reiter, P., additional, Sanchis, E., additional, Stezowski, O., additional, Theisen, Ch., additional, and Valiente-Dobón, J. J., additional

Published
2021
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111. Complete set of bound negative-parity states in the neutron-rich nucleus N18

Author

Ziliani, S., primary, Ciemała, M., additional, Crespi, F. C. L., additional, Leoni, S., additional, Fornal, B., additional, Suzuki, T., additional, Otsuka, T., additional, Maj, A., additional, Bednarczyk, P., additional, Benzoni, G., additional, Bracco, A., additional, Boiano, C., additional, Bottoni, S., additional, Brambilla, S., additional, Bast, M., additional, Beckers, M., additional, Braunroth, T., additional, Camera, F., additional, Cieplicka-Oryńczak, N., additional, Clément, E., additional, Coelli, S., additional, Dorvaux, O., additional, Erturk, S., additional, de France, G., additional, Fransen, C., additional, Goldkuhle, A., additional, Grębosz, J., additional, Harakeh, M. N., additional, Iskra, Ł. W., additional, Jacquot, B., additional, Karpov, A., additional, Kicińska-Habior, M., additional, Kim, Y., additional, Kmiecik, M., additional, Lemasson, A., additional, Lenzi, S. M., additional, Lewitowicz, M., additional, Li, H., additional, Matea, I., additional, Mazurek, K., additional, Michelagnoli, C., additional, Matejska-Minda, M., additional, Million, B., additional, Müller-Gatermann, C., additional, Nanal, V., additional, Napiorkowski, P., additional, Napoli, D. R., additional, Palit, R., additional, Rejmund, M., additional, Schmitt, Ch., additional, Stanoiu, M., additional, Stefan, I., additional, Vardaci, E., additional, Wasilewska, B., additional, Wieland, O., additional, Ziębliński, M., additional, and Zielińska, M., additional

Published
2021
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112. Lifetime measurements in the even-even Cd102–108 isotopes

Author

Siciliano, M., primary, Valiente-Dobón, J. J., additional, Goasduff, A., additional, Rodríguez, T. R., additional, Bazzacco, D., additional, Benzoni, G., additional, Braunroth, T., additional, Cieplicka-Oryńczak, N., additional, Clément, E., additional, Crespi, F. C. L., additional, de France, G., additional, Doncel, M., additional, Ertürk, S., additional, Fransen, C., additional, Gadea, A., additional, Georgiev, G., additional, Goldkuhle, A., additional, Jakobsson, U., additional, Jaworski, G., additional, John, P. R., additional, Kuti, I., additional, Lemasson, A., additional, Li, H., additional, Lopez-Martens, A., additional, Marchi, T., additional, Mengoni, D., additional, Michelagnoli, C., additional, Mijatović, T., additional, Müller-Gatermann, C., additional, Napoli, D. R., additional, Nyberg, J., additional, Palacz, M., additional, Pérez-Vidal, R. M., additional, Sayği, B., additional, Sohler, D., additional, Szilner, S., additional, and Testov, D., additional

Published
2021
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115. Complete set of bound negative-parity states in the neutron-rich $^{18}$N nucleus

Author

Ziliani, S., Ciema��a, M., Crespi, F. C. L., Leoni, S., Fornal, B., Suzuki, T., Otsuka, T., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Cl��ment, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, ��. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kimi, Y. -H., Kmiecik, M., Lemasson, A., Lewitowicz, M., Lenzi, S., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., M��ller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), Institut Laue-Langevin (ILL), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; High-resolution γ-ray spectroscopy of N18 is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an O18 beam on a Ta181 target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in N18 below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 01− and 12− excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in N16 and N18, for the first time. Understanding the N18 structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

Published
2021

116. Lifetime measurements in the even-even isotopes

Author

Siciliano, M., Valiente-Dobon, J. J., Goasduff, A., Rodriguez, T. R., Bazzacco, D., Benzoni, G., Braunroth, T., Cieplicka-Orynczak, N., Clement, E., Crespi, F. C. L., de France, G., Doncel, M., Erturk, S., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P. R., Kuti, I., Lemasson, A., Li, H., Lopez-Martens, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatovic, T., Muller-Gatermann, C., Napoli, D. R., Nyberg, J., Palacz, M., Perez-Vidal, R. M., Saygi, B., Sohler, D., Szilner, S., and Testov, D.

Published
2021

117. Reinterpretation of excited states in $^{212}$Po: Shell-model multiplets rather than $\alpha$-cluster states

Author

Fernández, A., Jungclaus, A., Golubev, P., Rudolph, D., Sarmiento, L.G., Gargano, A., Naïdja, H., Astier, A., Dupont, E., Gadea, A., Nácher, E., Perea, A., Wimmer, K., Clément, E., Fremont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H.J., Ljungvall, J., Ménager, L., Pérez-Vidal, R.M., Petrache, C.M., Ralet, D., Ropert, J.A., Saillant, F., Såmark-Roth, A., Simpson, G.S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lalović, N., Lorenz, Ch., Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A.J., Boston, H.C., Bracco, A., Ciemala, M., Collado, J., Cullen, D.M., Domingo-Pardo, C., Eberth, J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D.R., Nyberg, J., Podolyak, Zs., Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente-Dobón, J.J., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), 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 des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, 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 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.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Astrophysics::High Energy Astrophysical Phenomena, Nuclear Physics - Theory
Abstract

International audience; A $\gamma$ -ray spectroscopic study of $^{212}$Po was performed at the Grand Accélérateur National d’Ions Lourds, using the inverse kinematics α-transfer reaction $^{12}$C($^{208}$Pb, $^{212}$Po) $^8$Be and the AGATA spectrometer. A careful analysis based on $\gamma \gamma$ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of $1^-$ and $2^-$ and excitation energies below 2.1 MeV, which have been predicted by recent αcluster model calculations. A systematic comparison of the experimentally established excitation scheme of $^{212}$Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4$^-$), 1751 (8$^-$), 1787 (6$^-$), 1946 (4$^-$), 1986 (8$^-$), and 2016 (6$^-$) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of $^{212}$Po is supported by experimental information with respect to the linear polarization of $\gamma$ rays, which suggests a magnetic character of the 432-keV $\gamma$ ray decaying from the state at an excitation energy of 1787 keV to the $6^+_1$ yrast state, and exclusive reaction cross sections.

Published
2021

118. Lifetime measurements in the even-even Cd102-108 isotopes

Author

Siciliano, M., Valiente-Dobon, J.J., Goasduff, A., Rodriguez, T.R., Bazzacco, D., Benzoni, G., Braunroth, T., Cieplicka-Orynczak, N., Clement, E., Crespi, F.C.L., de France, G., Doncel, M., Erturk, S., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P.R., Kuti, I., Lemasson, A., Li, H., Lopez-Martens, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatović, Tea, Muller-Gatermann, C., Napoli, D.R., Nyberg, J., Palacz, M., Perez-Vidal, R.M., Saygi, B., Sohler, D., Szilner, Suzana, and Testov, D.

Subjects
transfer reactions, nuclear structure, lifetimes
Abstract

Background: The heaviest Tz=0 doubly-magic nucleus, 100Sn, and the neighboring nuclei offer unique opportunities to investigate the properties of nuclear interaction. For instance, the structure of light-Sn nuclei has been shown to be affected by the delicate balance between nuclear-interaction components, such as pairing and quadrupole correlations. From Cd to Te, many common features and phenomena have been observed experimentally along the isotopic chains, leading to theoretical studies devoted to a more general and comprehensive study of the region. In this context, having only two proton holes in the Z=50 shell, the Cd isotopes are expected to present properties similar to those found in the Sn isotopic chain. Purpose: The aim of this work was to measure lifetimes of excited states in neutron-deficient nuclei in the vicinity of 100Sn. Methods: The neutron-deficient nuclei in the N≈Z≈50 region were populated using a multinucleon transfer reaction with a 106Cd beam and a 92Mo target. The beamlike products were identified by the VAMOS++ spectrometer, while the γ rays were detected using the AGATA array. Lifetimes of excited states were determined using the recoil distance Doppler-shift method, employing the Cologne differential plunger. Results: Lifetimes of low-lying states were measured in the even-mass 102–108Cd isotopes. In particular, multiple states with excitation energy up to ≈3 MeV, belonging to various bands, were populated in 106Cd via inelastic scattering. The transition strengths corresponding to the measured lifetimes were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach. Conclusions: Despite the similarities in the electromagnetic properties of the low-lying states, there is a fundamental structural difference between the ground-state bands in the Z=48 and Z=50 isotopes. The comparison between experimental and theoretical results revealed a rotational character of the Cd nuclei, which have prolate-deformed ground states with β2≈0.2. At this deformation Z=48 becomes a closed-shell configuration, which is favored with respect to the spherical one.

Published
2021

119. Proton inelastic scattering in 68,70,72Ni isotopes

Author

Scomparin, L., Marchi, T., De Angelis, G., Baumann, T., Bazin, D., Gade, A., Gottardo, A., Gramegna, F., John, P.R., Klintefjora, M., Kolos, K., Lenzi, S., Mengoni, D., Michelagnoli, C., Modamio, Victor, Napoli, D., Noji, S., Pereira, J., Recchia, F., Sahin, Eda, Valiente-Dobón, J.J., Wimmer, K., Weisshaar, D., Zegers, R., Institut Laue-Langevin (ILL), and ILL

Subjects
Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

4 pags., 1 fig., A preliminary analysis of the proton inelastic scattering of Ni at intermediate energies will be discussed. This measurement is important for the study of the nuclear shell's evolution in the nickel isotopic chain. A brief description of the physics case, the setup, and the particle identification methods will be presented.

Published
2021

120. Reinterpretation of excited states in Po 212: Shell-model multiplets rather than α -cluster states

Author

Fernández, A., Jungclaus, Andrea, Golubev, P., Rudolph, D., Sarmiento, L. G., Gargano, A., Naïdja, H., Astier, A., Dupont, E., Gadea, Andrés, Nácher, Enrique, Perea, Ángel, Wimmer, K., Clément, E., Fremont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H. J., Ljungvall, J., Ménager, L., Pérez-Vidal, R.M., Petrache, C. M., Ralet, D., Ropert, J. A., Saillant, F., Såmark-Roth, A., Simpson, G. S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lalović, N., Lorenz, Ch, Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Bracco, A., Ciemala, M., Collado, J., Cullen, D.M., Domingo Pardo, César, Eberth, J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D.R., Nyberg, J., Podolyak, Zs, Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, Ch, Valiente-Dobón, J. J., European Commission, Ministerio de Ciencia, Innovación y Universidades (España), Ministerio de Economía y Competitividad (España), Generalitat Valenciana, Swedish Research Council, and Federal Ministry of Education and Research (Germany)

Abstract

19 pags., 14 figs., 3 tabs., A γ-ray spectroscopic study of Po212 was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction C12(Pb208,Po212)Be8 and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1- and 2- and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of Po212 with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4-), 1751 (8-), 1787 (6-), 1946 (4-), 1986 (8-), and 2016 (6-) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of Po212 is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 61+ yrast state, and exclusive reaction cross sections., This project has received funding from the European Union’s Horizon 2020 research and innovation programme under Grant Agreement No. 654002 and FEDER funds. We furthermore acknowledge support from the Spanish Ministerio de Ciencia, Inovación y Universidades under contracts FPA2014-57196-C5, FPA2017-84756-C4, and SEV-2014-0398, the Generalitat Valenciana under Grant No. PROMETEO/2019/005, the Swedish Research Council (Vetenskapsrådet, VR 2016-3969), and the German BMBF under Contracts No. 05P18PKFN9 and No. 05P19PKFNA.

Published
2021

121. Low-spin particle-core and hole-core excitations in $^{41,47,49}$Ca isotopes studied by cold-neutron-capture reactions

Author

Bottoni, S., Cieplicka-Oryńczak, N., Leoni, S., Fornal, B., Colò, G., Bortignon, P. F., Bocchi, G., Bazzacco, D., Benzoni, G., Blanc, A., Bracco, A., Ceruti, S., Crespi, F. C. L., de France, G., Gamba, E. R., Iskra, Ł. W., Jentschel, M., Köster, U., Michelagnoli, C., Million, B., Mengoni, D., Mutti, P., Niu, Y., Porzio, C., Simpson, G., Soldner, T., Szpak, B., Türler, A., Ur, C. A., Urban, W., Institut Laue-Langevin (ILL), ILL, 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), and 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)

Subjects
Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, Nuclear Experiment
Abstract

We present recent results on the structure of the one-valence-particle $^{41}$Ca and $^{49}$Ca, and one-valence-hole $^{47}$Ca, nuclei. The isotopes of interest were populated via the cold-neutron capture reactions $^{40}$Ca(n,$\gamma$), $^{48}$Ca(n,$\gamma$) and $^{46}$Ca(n,$\gamma$), respectively. The experiments were performed at the Institut Laue-Langevin, within the EXILL campaign, which employed a large array of HPGe detectors. The $\gamma$ decay and level schemes of these nuclei were investigated by $\gamma$-ray coincidence relationships, leading to the identification of 41, 10, and 6 new transitions in $^{41}$Ca, $^{47}$Ca, and $^{49}$Ca, respectively. Branching ratios and intensities were extracted for the $\gamma$ decay from each state, and $\gamma$-ray angular correlations were performed to establish a number of transition multipolarities and mixing ratios, thus helping in the spin assignment of the states. The experimental findings are discussed along with microscopic, self-consistent beyond-mean-field calculations performed with the Hybrid Configuration Mixing model, based on a Skyrme SkX Hamiltonian. The latter suggests that a fraction of the low-spin states of the $^{41}$Ca, $^{49}$Ca, and $^{47}$Ca nuclei is characterized by the coexistence of either 2p-1h and 1p-2h excitations, or couplings between single-particle/hole degrees of freedom and collective vibrations (phonons) of the doubly-magic "core".

Published
2021

122. Low-spin particle-core and hole-core excitations in Ca 41 , 47 , 49 isotopes studied by cold-neutron-capture reactions

Author

Bottoni, S., Cieplicka-Ory��czak, N., Leoni, S., Fornal, B., Col��, G., Bortignon, P. F., Bocchi, G., Bazzacco, D., Benzoni, G., Blanc, A., Bracco, A., Ceruti, S., Crespi, F. C. L., de France, G., Gamba, E. R., Iskra, ��. W., Jentschel, M., K��ster, U., Michelagnoli, C., Million, B., Mengoni, D., Mutti, P., Niu, Y., Porzio, C., Simpson, G., Soldner, T., Szpak, B., T��rler, A., Ur, C. A., and Urban, W.

Subjects
540 Chemistry, 570 Life sciences, biology
Published
2021
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123. Low-spin particle-core and hole-core excitations in Ca 41,47,49 isotopes studied by cold-neutron-capture reactions

Author

Bottoni, S., Cieplicka-Orynczak, N., Leoni, S., Fornal, B., Colo, G., Bortignon, P. F., Bocchi, G., Bazzacco, D., Benzoni, G., Blanc, A., Bracco, A., Ceruti, S., Crespi, F. C. L., De France, G., Gamba, E. R., Iskra, L. W., Jentschel, M., Koster, U., Michelagnoli, C., Million, B., Mengoni, D., Mutti, P., Niu, Y., Porzio, C., Simpson, G., Soldner, T., Szpak, B., Turler, A., C. A., Ur, and Urban, W.

Published
2021

124. Reinterpretation of excited states in Po-212 : Shell-model multiplets rather than alpha-cluster states

Author

Fernandez, A., Jungclaus, A., Golubev, P., Rudolph, D., Sarmiento, L. G., Gargano, A., Naidja, H., Astier, A., Dupont, E., Gadea, A., Nacher, E., Perea, A., Wimmer, K., Clement, E., Fremont, G., Goupil, J., Houarner, C., Jacquot, B., Korichi, A., Lemasson, A., Li, H. J., Ljungvall, J., Menager, L., Perez-Vidal, R. M., Petrache, C. M., Ralet, D., Ropert, J. A., Saillant, F., Samark-Roth, A., Simpson, G. S., Spitaels, C., Zielinska, M., Ansari, S., Dudouet, J., Illana, A., Jurado, M., Kocheva, D., Lorenz, Ch, Quintana, B., Rainovski, G., Redon, N., Tocabens, G., Barrientos, D., Benzoni, G., Birkenbach, B., Boston, A. J., Boston, H. C., Bracco, A., Ciemala, M., Collado, J., Cullen, D. M., Domingo-Pardo, C., Eberth, J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Judson, D. S., Korten, W., Leoni, S., Maj, A., Menegazzo, R., Mengoni, D., Michelagnoli, C., Million, B., Napoli, D. R., Nyberg, Johan, Podolyak, Zs, Pullia, A., Reiter, P., Sanchis, E., Stezowski, O., Theisen, Ch, and Valiente-Dobon, J. J.

Subjects
Subatomär fysik, Astrophysics::High Energy Astrophysical Phenomena, Subatomic Physics
Abstract

A gamma-ray spectroscopic study of Po-212 was performed at the Grand Accelerateur National d'Ions Lourds, using the inverse kinematics alpha-transfer reaction C-12(Pb-208, Po-212) Be-8 and the AGATA spectrometer. A careful analysis based on gamma gamma coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1(-) and 2(-) and excitation energies below 2.1 MeV, which have been predicted by recent alpha-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of Po-212 with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4(-)), 1751 (8(-)), 1787 (6(-)), 1946 (4(-)), 1986 (8(-)), and 2016 (6(-)) keV, which previously were interpreted as alpha-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of Po-212 is supported by experimental information with respect to the linear polarization of gamma rays, which suggests a magnetic character of the 432-keV gamma ray decaying from the state at an excitation energy of 1787 keV to the 6(1)(+) yrast state, and exclusive reaction cross sections.

Published
2021

125. Complete set of bound negative-parity states in the neutron-rich nucleus N-18

Author

Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Suzuki, T., Otsuka, T., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I, Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Mueller-Gatermann, C., Nanal, V, Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch, Stanoiu, M., Stefan, I, Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Ziebliska, M., Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Suzuki, T., Otsuka, T., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I, Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Mueller-Gatermann, C., Nanal, V, Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch, Stanoiu, M., Stefan, I, Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., and Ziebliska, M.

Abstract

High-resolution. -ray spectroscopy of N-18 is performed with the Advanced GAmma Tracking Array, following deep-inelastic processes induced by an O-18 beam on a Ta-181 target. Six states are newly identified, which together with the three known excitations exhaust all negative-parity excited states expected in N-18 below the neutron threshold. Spin and parities are proposed for all located states on the basis of decay branchings and comparison with large-scale shell-model calculations performed in the p-sd space, with the YSOX interaction. Of particular interest is the location of the 0(1)(-) and 1(2)(-) excitations, which provide strong constrains for cross-shell p-sd matrix elements based on realistic interactions and help to simultaneously reproduce the ground and first-excited states in N-16 and N-18, for the first time. Understanding the N-18 structure may also have significant impact on neutron-capture cross-section calculations in r-process modeling including light neutron-rich nuclei.

Published
2021

126. Lifetime analysis of short-lived states in N-17

Author

Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Mueller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Ziliani, S., Ciemala, M., Crespi, F. C. L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S. M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Mueller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D. R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., and Zielinska, M.

Abstract

A recent extension of the Doppler-shift attenuation method to measure short lifetimes of states populated in low-energy binary reactions is applied to the case of N-17. The reliability of the technique is confirmed by measuring the lifetime of the 5515 keV 3/2(-) state, which is depopulated by two different gamma rays. The method is used to measure the lifetime of the 5170 keV (9/2(+)) state in the same nucleus. Comparisons with large-scale shell-model predictions are given as well.

Published
2021

127. Lifetime measurements in the even-even 102-108Cd isotopes

Author

Siciliano, M., Valiente-Dobon, J. J., Goasduff, A., Rodriguez, T. R., Bazzacco, D., Benzoni, G., Braunroth, T., Cieplicka-Orynczak, N., Clement, E., Crespi, F. C. L., de France, G., Doncel, M., Erturk, S., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P. R., Kuti, I, Lemasson, A., Li, H., Lopez-Martens, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatovic, T., Mueller-Gatermann, C., Napoli, D. R., Nyberg, Johan, Palacz, M., Perez-Vidal, R. M., Saygi, B., Sohler, D., Szilner, S., Testov, D., Siciliano, M., Valiente-Dobon, J. J., Goasduff, A., Rodriguez, T. R., Bazzacco, D., Benzoni, G., Braunroth, T., Cieplicka-Orynczak, N., Clement, E., Crespi, F. C. L., de France, G., Doncel, M., Erturk, S., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P. R., Kuti, I, Lemasson, A., Li, H., Lopez-Martens, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatovic, T., Mueller-Gatermann, C., Napoli, D. R., Nyberg, Johan, Palacz, M., Perez-Vidal, R. M., Saygi, B., Sohler, D., Szilner, S., and Testov, D.

Abstract

Background: The heaviest T-z = 0 doubly-magic nucleus, Sn-100, and the neighboring nuclei offer unique opportunities to investigate the properties of nuclear interaction. For instance, the structure of light-Sn nuclei has been shown to be affected by the delicate balance between nuclear-interaction components, such as pairing and quadrupole correlations. From Cd to Te, many common features and phenomena have been observed experimentally along the isotopic chains, leading to theoretical studies devoted to a more general and comprehensive study of the region. In this context, having only two proton holes in the Z = 50 shell, the Cd isotopes are expected to present properties similar to those found in the Sn isotopic chain. Purpose: The aim of this work was to measure lifetimes of excited states in neutron-deficient nuclei in the vicinity of Sn-100. Methods: The neutron-deficient nuclei in the N approximate to Z approximate to 50 region were populated using a multinucleon transfer reaction with a Cd-106 beam and a Mo-92 target. The beamlike products were identified by the VAMOS++ spectrometer, while the gamma rays were detected using the AGATA array. Lifetimes of excited states were determined using the recoil distance Doppler-shift method, employing the Cologne differential plunger. Results: Lifetimes of low-lying states were measured in the even-mass Cd-102-(108) isotopes. In particular, multiple states with excitation energy up to MeV, belonging to various bands, were populated in approximate to 3 Cd-106 via inelastic scattering. The transition strengths corresponding to the measured lifetimes were compared with those resulting from state-of-the-art beyond-mean-field calculations using the symmetry-conserving configuration-mixing approach. Conclusions: Despite the similarities in the electromagnetic properties of the low-lying states, there is a fundamental structural difference between the ground-state bands in the Z = 48 and Z = 50 isotopes. The comparison between

Published
2021
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128. Neutron Skin Effects in Mirror Energy Differences: The Case of Mg-23-Na-23

Author

Boso, A., Lenzi, S. M., Recchia, F., Bonnard, J., Zuker, A. P., Aydin, S., Bentley, M. A., Cederwall, B., Clement, E., de France, G., Di Nitto, A., Dijon, A., Doncel, M., Ghazi-Moradi, F., Gadea, A., Gottardo, A., Henry, T., Huyuk, T., Jaworski, G., John, P. R., Juhasz, K., Kuti, I, Melon, B., Mengoni, D., Michelagnoli, C., Modamio, V, Napoli, D. R., Nyako, B. M., Nyberg, Johan, Palacz, M., Timar, J., Valiente-Dobon, J. J., [Boso, A. -- Lenzi, S. M. -- Recchia, F. -- Zuker, A. P. -- John, P. R. -- Mengoni, D. -- Michelagnoli, C.] Univ Padua, Dipartimento Fis & Astron, I-135131 Padua, Italy -- [Boso, A. -- Lenzi, S. M. -- Recchia, F. -- Bonnard, J. -- John, P. R. -- Mengoni, D. -- Michelagnoli, C.] INFN, Sez Padova, I-135131 Padua, Italy -- [Bonnard, J.] Univ Paris Saclay, Univ Paris Sud, Inst Phys Nucl, IN2P3,CNRS, F-91405 Orsay, France -- [Zuker, A. P.] Univ Strasbourg, F-67000 Strasbourg, France -- [Zuker, A. P.] IPHC, F-67000 Strasbourg, France -- [Aydin, S.] Aksaray Univ, Dept Phys, TR-68100 Aksaray, Turkey -- [Bentley, M. A. -- Henry, T.] Univ York, Dept Phys, York YO10 5DD, N Yorkshire, England -- [Cederwall, B. -- Doncel, M. -- Ghazi-Moradi, F.] Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden -- [Clement, E. -- de France, G. -- Dijon, A.] CNRS, CEA, GANIL, DRF,IN2P3, F-14076 Caen, France -- [Di Nitto, A.] Dipartimento Fis, I-80126 Naples, Italy -- [Di Nitto, A.] INFN, Sez Napoli, I-80126 Naples, Italy -- [Di Nitto, A.] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany -- [Gadea, A. -- Huyuk, T.] Univ Valencia, IFIC, CSIC, E-46980 Valencia, Spain -- [Gottardo, A. -- Modamio, V -- Napoli, D. R. -- Valiente-Dobon, J. J.] INFN, Lab Nazl Legnaro, I-35020 Padua, Italy -- [Jaworski, G. -- Palacz, M.] Warsaw Univ, Heavy Ion Lab, PL-02093 Warsaw, Poland -- [Juhasz, K. -- Kuti, I -- Nyako, B. M. -- Timar, J.] Hung Acad Sci, Inst Nucl Res ATOMKI, H-4001 Debrecen, Hungary -- [Melon, B.] Dipartimento Fis, I-50019 Florence, Italy -- [Melon, B.] INFN, Sez Firenze, I-50019 Florence, Italy -- [Nyberg, J.] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden -- [Boso, A.] Natl Phys Lab, Hampton Rd, Teddington TW11 0LW, Middx, England -- [John, P. R.] Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany, Cederwall, Bo -- 0000-0003-1771-2656, Di Nitto, Antonio -- 0000-0002-9319-366X, Huyuk, Tayfun -- 0000-0003-0597-9767, Gadea, Andres -- 0000-0002-4233-1970, GOTTARDO, Andrea -- 0000-0002-0390-5767, de France, Gilles -- 0000-0002-7439-1759, and Clement, Emmanuel -- 0000-0003-1887-717X

Subjects
Subatomär fysik, Nuclear Theory, Subatomic Physics, Nuclear Experiment
Abstract

WOS: 000439286800004, PubMed: 30085775, Energy differences between analogue states in the T = 1/2 Mg-23-Na-23 mirror nuclei have been measured along the rotational yrast bands. This allows us to search for effects arising from isospin-symmetrybreaking 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., European Union [262010 ENSAR, FP7/2007-2013], The authors are grateful to the GANIL accelerator team. This work has been financed by the European Union Seventh Framework Program No. FP7/2007-2013 under Grant Agreement No. 262010 ENSAR.

Published
2018

129. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn

Author

Siciliano, M., Valiente-Dobón, J.J., Goasduff, A., Nowacki, F., Zuker, A.P., Bazzacco, D., Lopez-Martens, A., Clément, E., Benzoni, G., Braunroth, T., Crespi, F.C.L., Cieplicka-Oryńczak, N., Doncel, M., Ertürk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P.R., Kuti, I., Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatović, T., Müller-Gatermann, C., Napoli, D.R., Nyberg, J., Palacz, M., Pérez-Vidal, R.M., Sayği, B., Sohler, D., Szilner, S., Testov, D., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, H.C., Boston, A.J., Cederwall, B., Collado, J., Cullen, D.M., Désesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F.J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Stezowski, O., and Theisen, Ch.

Published
2020
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131. 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

132. 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

133. DETERMINATION OF LIFETIMES OF EXCITED STATES IN NEUTRON-RICH O-20 ISOTOPE FROM EXPERIMENT WITH THE AGATA plus PARIS plus VAMOS SETUP

Author

Ciemala, M., Ziliani, S., Crespi, F., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clement, E., Dorvaux, O., Erturk, S., De France, G., Goldkuhle, A., Grebosz, J., Harakeh, M. N., Iskra, L. W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Li, H., Matea, I, Mazurek, K., Michelagnoli, C., Millon, B., Mueller-Gatermann, C., Napiorkowski, P., Nanal, V, Matejska-Minda, M., Rejmund, M., Sowicki, B., Schmitt, Ch, Stanoiu, M., Stefan, I, Wasilewska, B., Zielinska, M., Zieblinski, M., Fornal, Bogdan -- 0000-0002-1142-8067, Ciemala, Michal -- 0000-0001-5328-720X, and [Ciemala, M. -- Fornal, B. -- Maj, A. -- Bednarczyk, P. -- Cieplicka-Orynczak, N. -- Grebosz, J. -- Iskra, L. W. -- Kmiecik, M. -- Mazurek, K. -- Sowicki, B. -- Wasilewska, B. -- Zieblinski, M.] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland -- [Ziliani, S. -- Crespi, F. -- Leoni, S. -- Bracco, A. -- Bottoni, S. -- Brambilla, S. -- Camera, F.] Univ Milan, Via Celoria 16, I-20133 Milan, Italy -- [Ziliani, S. -- Crespi, F. -- Leoni, S. -- Benzoni, G. -- Bracco, A. -- Boiano, C. -- Bottoni, S. -- Camera, F. -- Millon, B.] INFN, Sez Milano, Milan, Italy -- [Bast, M. -- Beckers, M. -- Braunroth, T. -- Goldkuhle, A. -- Mueller-Gatermann, C.] IKP Cologne, Cologne, Germany -- [Clement, E. -- De France, G. -- Jacquot, B. -- Kim, Y. -- Lemasson, A. -- Li, H. -- Rejmund, M.] CEA DSAM, GANIL, Caen 05, France -- [Clement, E. -- De France, G. -- Jacquot, B. -- Kim, Y. -- Lemasson, A. -- Li, H. -- Rejmund, M.] CNRS, IN2P3, Caen 05, France -- [Dorvaux, O. -- Schmitt, Ch] CNRS, IN2P3, IPHC UMR 7178, F-67037 Strasbourg, France -- [Erturk, S.] Nigde Univ, Nigde, Turkey -- [Harakeh, M. N.] KVI Ctr Adv Radiat Technol, Groningen, Netherlands -- [Karpov, A.] JINR, Dubna, Russia -- [Kicinska-Habior, M.] Warsaw Univ, Fac Phys, Warsaw, Poland -- [Matea, I -- Stefan, I] IPN Orsay Lab, Orsay, France -- [Michelagnoli, C.] ILL Grenoble, Grenoble, France -- [Napiorkowski, P. -- Matejska-Minda, M.] Univ Warsaw, Heavy Ion Lab, Pasteura 5A, PL-02093 Warsaw, Poland -- [Nanal, V] Tata Inst Fundamental Res, Dept Nucl & Atom Phys, Mumbai 400005, Maharashtra, India -- [Stanoiu, M.] IFIN HH, Bucharest, Romania -- [Zielinska, M.] Ctr CEA Saclay, IRFU, CEA DRF, F-91191 Gif Sur Yvette, France

Abstract

Zakopane Conference on Nuclear Physics - Extremes of the Nuclear Landscape -- AUG 26-SEP 02, 2018 -- Zakopane, POLAND, WOS: 000463866500051, An experiment aiming at measuring lifetimes of the second 2(+) excited states in neutron-rich C and O isotopes was recently performed at the GANIL laboratory, in France. In these nuclei, recent ab initio calculations provide a detailed description of the nuclear excited states, predicting a strong sensitivity of the electromagnetic transition probabilities to the details of the nucleon-nucleon interactions, especially in connection with the role played by the three-body (NNN) forces. Thus, the measurement of 2(+) states lifetimes in this region will be a stringent test of the importance of including the NNN forces in describing the electromagnetic properties of selected nuclear states. This contribution reports on the status of the experimental analysis for the case of lifetimes in O-20., European Union's Horizon 2020 through ENSAR2 grant [654002]; National Science Centre, Poland (NCN) [2013/08/M/ST2/00257, 2014/14/M/ST2/00738, 2016/22/M/ST2/00269]; COPININ2P3 collaboration, We acknowledge the important technical contributions of J. Goupil and the GANIL accelerator staff. The authors acknowledge support from the European Union's Horizon 2020 through ENSAR2 grant agreement No. 654002, the National Science Centre, Poland (NCN) Contract No. 2013/08/M/ST2/00257, 2014/14/M/ST2/00738 and 2016/22/M/ST2/00269 and COPININ2P3 collaboration.

Published
2019

134. Lifetime measurements of excited states in neutron-rich $^{53}$Ti : Benchmarking effective shell-model interactions

Author

Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Clément, E., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y.-H., Lemasson, A., Lenzi, S., Li, H., Litzinger, J., Michelagnoli, C., Müller-Gatermann, C., Nara Singh, B., Pérez-Vidal, R., Ralet, D., Reiter, P., Vogt, A., Warr, N., Zell, K., Grand Accélérateur National d'Ions Lourds (GANIL), 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), 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 de Physique des 2 Infinis de Lyon (IP2I Lyon), 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), 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 National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut 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-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Level lifetimes of the yrast (5/2 −) to 13/2 − states in the neutron-rich nucleus 53 Ti, produced in a multinucleon-transfer reaction, have been measured for the first time. The recoil distance Doppler-shift method was employed and lifetimes of the excited states were extracted by a lineshape analysis aided by Geant4-based Monte-Carlo simulations. The experiment was performed at the Grand Accélérateur National d'Ions Lourds facility in Caen, France, by using the Advanced Gamma Tracking Array for the γ-ray detection coupled to the large-acceptance variable mode spectrometer for an event-by-event particle identification and the Cologne plunger for deep-inelastic reactions. Reduced transition probabilities, deduced from the lifetimes, give new information on the nuclear structure of 53 Ti, and are used to benchmark different shell-model calculations using established interactions in the fp shell.

Published
2020

135. Lifetimes of core-excited states in semi-magic Rh-95

Author

Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyako, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clement, E., Debenham, D. M., Dombradi, Zs., Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, Johan, Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timar, J., Valiente-Dobon, J. J., Xiao, Z. G., and Department of Chemistry

Subjects
Subatomär fysik, Subatomic Physics, Nuclear Theory, TRANSITIONS, Nuclear Experiment, 114 Physical sciences, SHIFT ATTENUATION METHOD
Abstract

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus Rh-95. The fusion-evaporation reaction Ni-58(Ca-40, 3p) was used to populate high-spin states in Rh-95 at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6 mg/cm(2) metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. state-of-the-art theory. Remarkably, the structural features up to moderate angular momentum of nuclei immediately below the N = Z = 50 shell closures can be described with high accuracy in a very simple way by shell-model calculations including only the g(9/2) and p(1/2) subshells. Of special interest is the neutron-proton pair coupling scheme which is expected to appear in the heaviest N=Z nuclei [1,2] and the seniority structure of the N = 50 isotones [3-7]. However, multiple core-excited states have been observed in the semi-magic nuclei of the Sn-100 region [8-10]. The theoretical study of those states is a challenging task, which requires a significantly larger model space for their interpretation. Transition probabilities between nuclear states provide important constraints for theoretical modelling of the structure of the nuclei of interest. Our previous lifetime study of the semimagic (N = 50) nucleus Ru-94 [ 11,12] provided information on the electromagnetic decay properties of neutron-core excited states. We now address lifetime measurements in its closest, more neutron deficient, isotone Rh-95 using the same DSAM technique. The experimental results have been interpreted within the framework of large-scale shell-model (LSSM) calculations.

Published
2020

136. Lifetimes of core-excited states in semi-magic $^{95}$Rh

Author

Ertoprak, A., Qi, C., Cederwall, B., Doncel, M., Jakobsson, U., Nyakó, B. M., Jaworski, G., Davies, P., de France, G., Kuti, I., Napoli, D. R., Wadsworth, R., Ghugre, S. S., Raut, R., Akkus, B., Al Azri, H., Algora, A., de Angelis, G., Atac, A., Bäck, T., Boso, A., Clément, E., Debenham, D. M., Dombrádi, Zs, Ertürk, S., Gadea, A., Ghazi Moradi, F., Gottardo, A., Hüyük, T., Ideguchi, E., Li, H., Michelagnoli, C., Modamio, V., Nyberg, J., Palacz, M., Petrache, C. M., Recchia, F., Sandzelius, M., Siciliano, M., Sohler, D., Timár, J., Valiente-Dobón, J. J., Xiao, Z. G., 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
lifetimes, core-excited states, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ydinfysiikka, ComputingMilieux_MISCELLANEOUS
Abstract

Lifetimes of negative-parity states have been determined in the neutron deficient semi-magic (N = 50) nucleus 95Rh. The fusion-evaporation reaction 58Ni(40Ca,3p) was used to populate high-spin states in 95Rh at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator facility. The results were obtained using the Doppler Shift Attenuation Method (DSAM) based on the Doppler broadened line shapes produced during the slowing down process of the residual nuclei in a thick 6mg/cm2 metallic target. B(M1) and B(E2) reduced transition strengths are compared with predictions from large-scale shell-model calculations. peerReviewed

Published
2020

137. Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in Sn

Author

Siciliano, M., Valiente-Dobón, J.J., Goasduff, A., Nowacki, F., Zuker, A.P., Bazzacco, D., Lopez-Martens, A., Clément, E., Benzoni, G., Braunroth, T., Crespi, F.C.L., Cieplicka-Oryńczak, N., Doncel, M., Ertürk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P.R., Kuti, I., Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatović, T., Müller-Gatermann, C., Napoli, D.R., Nyberg, J., Palacz, M., Pérez-Vidal, R.M., Sayği, B., Sohler, D., Szilner, S., Testov, D., Zielińska, M., Barrientos, D., Birkenbach, B., Boston, H.C., Boston, A.J., Cederwall, B., Collado, J., Cullen, D.M., Désesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F.J., González, V., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M.D., Sanchis, E., Stezowski, O., and Theisen, Ch.

Abstract

The lifetimes of the low-lying excited states 2+ and 4+ have been directly measured in the neutron-deficient $^{106,108}$Sn isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted γ rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2;21+→0g.s.+) values and it describes well the experimental pattern for $^{104−114}$Sn; the B(E2;41+→21+) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in $^{108}$Sn.

Published
2020

138. High-precision spectroscopy of $^{65}$Ni via neutron capture

Author

Porzio, C., Michelagnoli, C., Cieplicka-Orynczak, N., Sferrazza, M., Leoni, S., Fornal, B., Tsunoda, Y., Otsuka, T., Bottoni, S., Costache, C., Crespi, F.C.L., Iskra, Ł.W., Jentschel, M., Kandzia, F., Kim, Y.H., Köster, U., Marginean, N., Mihai, C., Mutti, P., Turturica, A., Institut Laue-Langevin (ILL), and ILL

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment
Abstract

International audience; Detailed studies of the low-spin structures of neutron-rich Ni isotopes may help shedding light on the shape coexistence phenomenon. Of particular interest is the 65Ni nucleus, since it lies between 64Ni and 66Ni, where shape coexistence has been reported earlier. A spectroscopic investigation of 65Ni has been performed at Institut Laue-Langevin via the reaction64Ni(n,γ) 65Ni, using the FIPPS HPGe array. Several new gamma transitions have been observed and angular correlation analyses have been performed. A comparison with Monte Carlo shell-model calculations pointed to a dominance of spherical states up to 1.5 MeV excitation energy, together with the appearance of two states of oblate character.

Published
2020

139. Shape Coexistence at Zero Spin in Ni-64 Driven by the Monopole Tensor Interaction

Author

Marginean, 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, Calinescu, S, Campbell, CM, Carpenter, MP, Chowdhury, P, Ciemala, M, Cieplicka-Orynczak, 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, LW, Jentschel, M, Kandzia, F, Kim, YH, Kondev, FG, Korschinek, G, Koster, U, Krishichayan, Krzysiek, M, Lauritsen, T, Li, J, Marginean, R, Maugeri, EA, Mihai, C, Mihai, RE, Mitu, A, Mutti, P, Negret, A, Nita, CR, Olacel, A, Oprea, A, Pascu, S, Petrone, C, Porzio, C, Rhodes, D, Seweryniak, D, Schumann, D, Sotty, C, Stolze, SM, Suvaila, R, Toma, S, Ujeniuc, S, Walters, WB, Wu, CY, Wu, J, Zhu, S, and Ziliani, S

Subjects
Science & Technology, STATES, Physics, Physical Sciences, Physics, Multidisciplinary, TRANSITION
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. ispartof: PHYSICAL REVIEW LETTERS vol:125 issue:10 ispartof: location:United States status: published

Published
2020

140. Testing ab initio nuclear structure in neutron-rich nuclei: Lifetime measurements of second 2 + state in C 16 and O 20

Author

Ciemała, M., Ziliani, S., Crespi, F., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Oryńczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., De France, G., Fransen, C., Goldkuhle, A., Grębosz, J., Harakeh, M., Iskra, Ł., Jacquot, B., Karpov, A., Kicińska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Müller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D., Palit, R., Rejmund, M., Schmitt, CH., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielińska, M., Ataç, A., Barrientos, D., Birkenbach, B., Boston, A., Cederwall, B., Charles, L., Collado, J., Cullen, D., Désesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., González, V., Goupil, J., Harkness-Brennan, L., Hess, H., Judson, D., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Nyberg, J., Perez-Vidal, R., Podolyak, Zs., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente-Dobón, J., Holt, J., Menéndez, J., Schwenk, A., Simonis, J., Institut Pluridisciplinaire Hubert Curien (IPHC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS]Physics [physics], [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2020

141. Prompt-delayed γ -ray spectroscopy of neutron-rich $^{119,121}$In isotopes

Author

Biswas, S., Lemasson, A., Rejmund, M., Navin, A., Kim, Y. H., Michelagnoli, C., Stefan, I., Banik, R., Bednarczyk, P., Bhattacharya, Soumik, Bhattacharyya, S., Clément, E., Crawford, H. L., de France, G., Fallon, P., Frémont, G., Goupil, J., Jacquot, B., Li, H. J., Ljungvall, J., Maj, A., Ménager, L., Morel, V., Palit, R., Pérez-Vidal, R. M., Ropert, J., 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and 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)

Subjects
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

The fusion and transfer induced fission reaction $^{9}$Be($^{238}$U,~f) with 6.2 MeV/u beam energy, using a unique setup consisting of AGATA, VAMOS++ and EXOGAM detectors, was used to populate through the fission process and study the neutron-rich $^{119,121}$In isotopes. This setup enabled the prompt-delayed $\gamma$-ray spectroscopy of isotopes in the time range of $100~\rm{ns} - 200~\mu\rm{s}$. In the odd-$A$ $^{119,121}$In isotopes, indications of a short half-life $19/2^{-}$ isomeric state, in addition to the previously known $25/2^{+}$ isomeric state, were observed from the present data. Further, new prompt transitions above the $25/2^{+}$ isomer in $^{121}$In were identified along with reevaluation of its half-life. The experimental data were compared with the theoretical results obtained in the framework of large-scale shell-model calculations in a restricted model space. The $\langle \pi g_{9/2} \nu h_{11/2};I \arrowvert \hat{\mathcal{H}}\arrowvert \pi g_{9/2} \nu h_{11/2};I\rangle$ two-body matrix elements of residual interaction were modified to explain the excitation energies and the $B(E2)$ transition probabilities in the neutron-rich In isotopes. The (i) decreasing trend of $E(29/2^{+}) - E(25/2^{+})$ in odd-In (with dominant configuration $\pi g_{9/2}^{-1}\nu h_{11/2}^{-2}$ and maximum aligned spin of $29/2^{+}$) and (ii) increasing trend of $E(27/2^{+}) - E(23/2^{+})$ in odd-Sb (with dominant configuration $\pi g_{7/2}^{+1}\nu h_{11/2}^{-2}$ and maximum aligned spin of $27/2^{+}$) with increasing neutron number could be understood as a consequence of hole-hole and particle-hole interactions, respectively., Comment: Accepted for publication in Phys. Rev. C

Published
2020

142. $\gamma$ spectroscopy of the $^{96}\mathrm{Y}$ isotope: Searching for the onset of shape coexistence before $N=60$

Author

Iskra, Ł. W., Leoni, S., Fornal, B., Michelagnoli, C., Kandzia, F., Mărginean, N., Barani, M., Bottoni, S., Cieplicka-Oryńczak, N., Colombi, G., Costache, C., Crespi, F.C.L., Dudouet, J., Jentschel, M., Kim, Y.H., Köster, U., Lica, R., Mărginean, R., Mihai, C., Mihai, R.E., Nita, C.R., Pascu, S., Porzio, C., Reygadas, D., Ruiz-Martinez, E., Turturica, A., Institut Laue-Langevin (ILL), ILL, Institut de Physique des 2 Infinis de Lyon (IP2I 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-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, Nuclear Structure
Abstract

International audience; Medium and high spin states of the Y96 nucleus, located in the shape-coexistence region near Z=40 and N=60, were populated in thermal-neutron-induced fission of U233 and U235 targets, diluted in a scintillator. γ rays were measured with the FIssion Product Prompt γ-ray Spectrometer (FIPPS) high-purity germanium (HPGe) detector array, using double and triple γ-ray coincidence techniques and taking advantage of the efficient fission tag provided by the scintillating target material. A complex level scheme, extending up to 5.2 MeV and including excitations above the 8+β-decaying isomer, was investigated, and firm spin and parity assignments were given to a number of states, on the basis of angular correlation analysis and considerations on the γ-decay patterns. While the structures built on the 0− ground state and the 8+ isomer show irregular patterns typical for spherical shapes, the (6+) isomeric state at 1655 keV [with half-life of 181(9) ns], and the rotational band built on it [with spin-parity values between (6+) and (9+)], can be explained by Hartree-Fock-Bogoliubov calculations, if an oblate deformation is assumed. This is the first observation of a deformed structure in an N=57 isotone, lying three neutrons away from the N=60 line. An important finding is also the 115-keV transition which connects the (6+) 181(9)-ns isomer to the β-decaying 8+ spherical isomer, allowing us to firmly place the latter at 1541 keV excitation energy. This may be relevant for calculations of electron and antineutrino spectra from fission of actinides, for which Y96 is a prominent product.

Published
2020

143. Lifetime measurements of excited states in neutron-rich Ti 53: Benchmarking effective shell-model interactions

Author

Goldkuhle, A., Blazhev, A., Fransen, C., Dewald, A., Beckers, M., Birkenbach, B., Braunroth, T., Cl+¬ment, E., Dudouet, J., Eberth, J., Hess, H., Jacquot, B., Jolie, J., Kim, Y. -H., Lemasson, A., Lenzi, S. M., H. J., Li, Litzinger, J., Michelagnoli, C., M++ller-Gatermann, C., Nara Singh, B. S., P+¬rez-Vidal, R. M., Ralet, D., Reiter, P., Vogt, A., Warr, N., and Zell, K. O.

Published
2020

144. Lifetime measurements of excited states in neutron-rich Ti 53 : Benchmarking effective shell-model interactions

Author

A. Goldkuhle, A. Blazhev, C. Fransen, A. Dewald, M. Beckers, B. Birkenbach, T. Braunroth, E. Clément, J. Dudouet, J. Eberth, H. Hess, B. Jacquot, J. Jolie, Y.-H. Kim, A. Lemasson, S. M. Lenzi, H. J. Li, J. Litzinger, C. Michelagnoli, C. Müller-Gatermann, B. S. Nara Singh, R. M. Pérez-Vidal, D. Ralet, P. Reiter, A. Vogt, N. Warr, K. O. Zell

Published
2020
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146. Testing $ab initio$ nuclear structure in neutron-rich nuclei: lifetime measurements of second 2$^+$ states in $^{16}$C and $^{20}$O

Author

Ciemala, M., Ziliani, S., Crespi, F.C.L., Leoni, S., Fornal, B., Maj, A., Bednarczyk, P., Benzoni, G., Bracco, A., Boiano, C., Bottoni, S., Brambilla, S., Bast, M., Beckers, M., Braunroth, T., Camera, F., Cieplicka-Orynczak, N., Clément, E., Coelli, S., Dorvaux, O., Erturk, S., de France, G., Fransen, C., Goldkuhle, A., Grebosz, J., Harakeh, M.N., Iskra, L.W., Jacquot, B., Karpov, A., Kicinska-Habior, M., Kim, Y., Kmiecik, M., Lemasson, A., Lenzi, S.M., Lewitowicz, M., Li, H., Matea, I., Mazurek, K., Michelagnoli, C., Matejska-Minda, M., Million, B., Muller-Gatermann, C., Nanal, V., Napiorkowski, P., Napoli, D.R., Palit, R., Rejmund, M., Schmitt, Ch., Stanoiu, M., Stefan, I., Vardaci, E., Wasilewska, B., Wieland, O., Zieblinski, M., Zielinska, M., Atac, A., Barrientos, D., Birkenbach, B., Boston, A.J., Cederwall, B., Charles, L., Collado, J., Cullen, D.M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Gonzalez, V., Goupil, J., Harkness-Brennan, L.J., Hess, H., Judson, D.S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Menegazzo, R., Mengoni, D., Nyberg, J., Perez-Vidal, R.M., Podolyak, Zs., Pullia, A., Recchia, F., Reiter, P., Saillant, F., Salsac, M.D., Sanchis, E., Stezowski, O., Theisen, Ch., Valiente-Dobon, J.J., Holt, J.D., Menendez, J., Schwenk, A., Simonis, J., Grand Accélérateur National d'Ions Lourds (GANIL), 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), Institut Pluridisciplinaire Hubert Curien (IPHC), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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 Laue-Langevin (ILL), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), 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)-Centre National de la Recherche Scientifique (CNRS), ILL, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Centre National de la Recherche Scientifique (CNRS)-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)

Subjects
Nuclear Theory (nucl-th), nucl-th, Nuclear Theory, Nuclear Physics - Theory, Starke Wechselwirkung und exotische Kerne – Abteilung Blaum, FOS: Physical sciences, Nuclear Physics - Experiment, ddc:530, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], nucl-ex, Nuclear Structure, Nuclear Experiment
Abstract

To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich O20,τ(22+)=150−30+80fs, and an estimate for the lifetime of the second 2+ state in C16 have been obtained for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds of femtoseconds range by analyzing the Doppler-shifted γ-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction O18(7.0MeV/u)+Ta181. The requested sensitivity could only be reached owing to the excellent performances of the Advanced γ-Tracking Array AGATA, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two- and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for O20 and with the no-core shell model for C16. The present measurement shows the power of electromagnetic observables, determined with high-precision γ spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetime measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense beams, produced by Isotope Separation On-Line (ISOL) techniques, become available. To test the predictive power of ab initio nuclear structure theory, the lifetime of the second 2+ state in neutron-rich 20O, tau(2+_2 ) = 150(+80-30) fs, and an estimate for the lifetime of the second 2+ state in 16C have been obtained, for the first time. The results were achieved via a novel Monte Carlo technique that allowed us to measure nuclear state lifetimes in the tens-to-hundreds femtoseconds range, by analyzing the Doppler-shifted gamma-transition line shapes of products of low-energy transfer and deep-inelastic processes in the reaction 18O (7.0 MeV/u) + 181Ta. The requested sensitivity could only be reached owing to the excellent performances of the AGATA gamma-tracking array, coupled to the PARIS scintillator array and to the VAMOS++ magnetic spectrometer. The experimental lifetimes agree with predictions of ab initio calculations using two- and three-nucleon interactions, obtained with the valence-space in-medium similarity renormalization group for 20O, and with the no-core shell model for 16C. The present measurement shows the power of electromagnetic observables, determined with high-precision gamma spectroscopy, to assess the quality of first-principles nuclear structure calculations, complementing common benchmarks based on nuclear energies. The proposed experimental approach will be essential for short lifetimes measurements in unexplored regions of the nuclear chart, including r-process nuclei, when intense ISOL-type beams become available.

Published
2020

147. Pairing-quadrupole interplay in the neutron-deficient tin nuclei : First lifetime measurements of low-lying states in Sn-106,Sn-108

Author

Siciliano, M., Valiente-Dobon, J. J., Goasduff, A., Nowacki, F., Zuker, A. P., Bazzacco, D., Lopez-Martens, A., Clement, E., Benzoni, G., Braunroth, T., Crespi, F. C. L., Cieplicka-Orynczak, N., Doncel, M., Ertuerk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P. R., Kuti, I, Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatovic, T., Muller-Gatermann, C., Napoli, D. R., Nyberg, Johan, Palacz, M., Perez-Vidal, R. M., Saygi, B., Sohler, D., Szilner, S., Testov, D., Zielinska, M., Barrientos, D., Birkenbach, B., Boston, H. C., Boston, A. J., Cederwall, B., Collado, J., Cullen, D. M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F. J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., Theisen, Ch, Siciliano, M., Valiente-Dobon, J. J., Goasduff, A., Nowacki, F., Zuker, A. P., Bazzacco, D., Lopez-Martens, A., Clement, E., Benzoni, G., Braunroth, T., Crespi, F. C. L., Cieplicka-Orynczak, N., Doncel, M., Ertuerk, S., de France, G., Fransen, C., Gadea, A., Georgiev, G., Goldkuhle, A., Jakobsson, U., Jaworski, G., John, P. R., Kuti, I, Lemasson, A., Marchi, T., Mengoni, D., Michelagnoli, C., Mijatovic, T., Muller-Gatermann, C., Napoli, D. R., Nyberg, Johan, Palacz, M., Perez-Vidal, R. M., Saygi, B., Sohler, D., Szilner, S., Testov, D., Zielinska, M., Barrientos, D., Birkenbach, B., Boston, H. C., Boston, A. J., Cederwall, B., Collado, J., Cullen, D. M., Desesquelles, P., Domingo-Pardo, C., Dudouet, J., Eberth, J., Egea-Canet, F. J., Gonzalez, V, Harkness-Brennan, L. J., Hess, H., Judson, D. S., Jungclaus, A., Korten, W., Labiche, M., Lefevre, A., Leoni, S., Li, H., Maj, A., Menegazzo, R., Million, B., Pullia, A., Recchia, F., Reiter, P., Salsac, M. D., Sanchis, E., Stezowski, O., and Theisen, Ch

Abstract

The lifetimes of the low-lying excited states 2(+) and 4(+) have been directly measured in the neutron-deficient Sn-106,Sn-108 isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted gamma rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer. Large-Scale Shell-Model calculations with realistic forces indicate that, independently of the pairing content of the interaction, the quadrupole force is dominant in the B(E2; 2(1)(+) -> 0(g.s)(+)) values and it describes well the experimental pattern for Sn104-114 ; the B(E2;(+)(4) -> 2(1)(+)) values, measured here for the first time, depend critically on a delicate pairing-quadrupole balance, disclosed by the very precise results in Sn-108. (C) 2020 The Authors. Published by Elsevier B.V.

Published
2020
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148. LIFETIME MEASUREMENTS OF LOW-LYING STATES IN Ga-73 AND Zn-70,Zn-72,Zn-74 ISOTOPES

Author

Milanovic, T., Celikovic, I., Michelagnoli, C., De France, G., Boso, A., Braunroth, T., Clement, E., Dewald, A., Georgiev, G., Ideguchi, E., Jacquot, B., Krolas, W., Napoli, D., Lalovic, N., Lee, K. Y., Lemasson, A., Li, H., Ljungvall, J., Navin, A., Nori, A., Perez-Vidal, R., Rejmund, M., Ujic, P., Wilmsen, D., Yamamoto, Y., Zielinska, M., Milanovic, T., Celikovic, I., Michelagnoli, C., De France, G., Boso, A., Braunroth, T., Clement, E., Dewald, A., Georgiev, G., Ideguchi, E., Jacquot, B., Krolas, W., Napoli, D., Lalovic, N., Lee, K. Y., Lemasson, A., Li, H., Ljungvall, J., Navin, A., Nori, A., Perez-Vidal, R., Rejmund, M., Ujic, P., Wilmsen, D., Yamamoto, Y., and Zielinska, M.

Abstract

Lifetimes of low-lying states in Ga-73 and Zn-70,Zn-72,Zn-74 were measured using the Recoil Distance Doppler Shift (RDDS) method. These nuclei were produced in deep-inelastic reactions in inverse kinematics with a Pb-208 beam impinging on a Ge-76 target. Prompt gamma rays were detected using the AGATA tracking array coupled to the VAMOS++ spectrometer. Lifetime of the 5/2(-) state in Ga-73, measured for the first time, provides additional evidence for the existence of a 1/2(-), 3/2(-) ground-state doublet. The lifetimes of the 4(+) states in Zn-70,Zn-72,Zn-74 were remeasured in an attempt to understand the discrepancies observed between earlier measurements. Our results are in agreement with those of previous plunger experiments.

Published
2020

150. Low-spin particle-core and hole-core excitations in Ca41,47,49 isotopes studied by cold-neutron-capture reactions

Author

Bottoni, S., primary, Cieplicka-Oryńczak, N., additional, Leoni, S., additional, Fornal, B., additional, Colò, G., additional, Bortignon, P. F., additional, Bocchi, G., additional, Bazzacco, D., additional, Benzoni, G., additional, Blanc, A., additional, Bracco, A., additional, Ceruti, S., additional, Crespi, F. C. L., additional, de France, G., additional, Gamba, E. R., additional, Iskra, Ł. W., additional, Jentschel, M., additional, Köster, U., additional, Michelagnoli, C., additional, Million, B., additional, Mengoni, D., additional, Mutti, P., additional, Niu, Y., additional, Porzio, C., additional, Simpson, G., additional, Soldner, T., additional, Szpak, B., additional, Türler, A., additional, Ur, C. A., additional, and Urban, W., additional

Published
2021
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