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4. Shell-model calculation of Mo 100 double- β decay

Author

Coraggio L., Itaco N., De Gregorio G., Gargano A., Mancino R., Nowacki F., Coraggio, L., Itaco, N., De Gregorio, G., Gargano, A., Mancino, R., and Nowacki, F.

Subjects
Nuclear Theory
Abstract

For the first time, the calculation of the nuclear matrix element of the double-β decay of Mo100, with and without the emission of two neutrinos, is performed in the framework of the nuclear shell model. This task is accomplished starting from a realistic nucleon-nucleon potential, then the effective shell-model Hamiltonian and decay operators are derived within the many-body perturbation theory. The exotic features which characterize the structure of Mo isotopes - such as shape coexistence and triaxiality softness - push the shell-model computational problem beyond its present limits, making it necessary to truncate the model space. This has been done with the goal to preserve as much as possible the role of the rejected degrees of freedom in an effective approach that has been introduced and tested in previous studies. This procedure is grounded on the analysis of the effective single-particle energies of a large-scale shell-model Hamiltonian, that leads to a truncation of the number of the orbitals belonging to the model space. Then, the original Hamiltonian generates a new one by way of a unitary transformation onto the reduced model space, to retain effectively the role of the excluded single-particle orbitals. The predictivity of our calculation of the nuclear matrix element for the neutrinoless double-β decay of Mo100 is supported by comparison with experiments of the calculated spectra, electromagnetic transition strengths, Gamow-Teller transition strengths, and the two-neutrino double-β nuclear matrix elements.

Published
2022

5. Proton-hole and core-excited states in the semi-magic nucleus 131In82

Author

Taprogge, J., Jungclaus, A., Grawe, H., Borzov, I. N., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Söderström, P. -A., Sumikama, T., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bönig, S., Chae, K. Y., Coraggio, L., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Kröll, T., Lane, G. J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., and Wendt, A.

Published
2016
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6. Shell-model calculation of $^{100}$Mo double-$\beta$ decay

Author

Coraggio, L., Itaco, N., De Gregorio, G., Gargano, A., Mancino, R., and Nowacki, F.

Subjects
High Energy Physics - Phenomenology, Nuclear Theory, Nuclear Experiment, High Energy Physics - Experiment
Abstract

For the first time, the calculation of the nuclear matrix element of the double-$\beta$ decay of $^{100}$Mo, with and without the emission of two neutrinos, is performed in the framework of the nuclear shell model. This task is accomplished starting from a realistic nucleon-nucleon potential, then the effective shell-model Hamiltonian and decay operators are derived within the many-body perturbation theory. The exotic features which characterize the structure of Mo isotopes -- such as shape coexistence and triaxiality softness -- push the shell-model computational problem beyond its present limits, making it necessary to truncate the model space. This has been done with the goal to preserve as much as possible the role of the rejected degrees of freedom in an effective approach that has been introduced and tested in previous studies. This procedure is grounded on the analysis of the effective single-particle energies of a large-scale shell-model Hamiltonian, that leads to a truncation of the number of the orbitals belonging to the model space. Then, the original Hamiltonian generates a new one by way of a unitary transformation onto the reduced model space, to retain effectively the role of the excluded single-particle orbitals. The predictivity of our calculation of the nuclear matrix element for the neutrinoless double-$\beta$ decay of $^{100}$Mo is supported by the comparison with experiment of the calculated spectra, electromagnetic transition strengths, Gamow-Teller transition strengths and the two-neutrino double-beta nuclear matrix elements., Comment: 14 pages, 10 figures, accepted for publication in Physical Review C

Published
2022

8. Evidence of Partial Seniority Conservation in the $\pi{g}_{9/2}$ Shell for the $N=50$ Isotones

Author

Perez-Vidal, Rm, Gadea, A, Domingo-Pardo, C, Gargano, A, Valiente-Dobon, Jj, Clement, E, Lemasson, A, Coraggio, L, Siciliano, M, Szilner, S, Bast, M, Braunroth, T, Collado, J, Corina, A, Dewald, A, Doncel, M, Dudouet, J, de France, G, Fransen, C, Gonzalez, V, Huyuk, T, Jacquot, B, John, Pr, Jungclaus, A, Kim, Yh, Korichi, A, Labiche, M, Lenzi, S, Li, H, Ljungvall, J, Lopez-Martens, A, Mengoni, D, Michelagnoli, C, Muller-Gatermann, C, Napoli, Dr, Navin, A, Quintana, B, Ramos, D, Rejmund, M, Sanchis, E, Simpson, J, Stezowski, O, Wilmsen, D, Zielinska, M, Boston, Aj, Barrientos, D, Bednarczyk, P, Benzoni, G, Birkenbach, B, Boston, Hc, Bracco, A, Cederwall, B, Cullen, Dm, Didierjean, F, Eberth, J, Gottardo, A, Goupil, J, Harkness-Brennan, Lj, Hess, H, Judson, Ds, Kaskas, A, Korten, W, Leoni, S, Menegazzo, R, Million, B, Nyberg, J, Podolyak, Z, Pullia, A, Ralet, D, Recchia, F, Reiter, P, Rezynkina, K, Salsac, Md, Senyigit, M, Sohler, D, Theisen, C, Verney, D, 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 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), 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), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), and 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)

Subjects
Subatomär fysik, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Nuclear Physics - Theory, Atom and Molecular Physics and Optics, Subatomic Physics, Atom- och molekylfysik och optik
Abstract

International audience; The reduced transition probabilities for the $4^+_1 \to 2^+_1$ and $2^+_1 \to 0^+_1$ transitions in $^{92}$Mo and $^{94}$Ru and for the $4^+_1 \to 2^+_1$ and $6^+_1 \to 4^+_1$ transitions in $^{90}$Zr have been determined in this experiment making use of a multinucleon transfer reaction. These results have been interpreted on the basis of realistic shell-model calculations in the $f_{5/2}, p_{3/2}, p_{1/2},$ and $g_{9/2}$ proton valence space. Only the combination of extensive lifetime information and large scale shell-model calculations allowed the extent of the seniority conservation in the $N=50 g_{9/2}$ orbital to be understood. The conclusion is that seniority is largely conserved in the first $\pi{g}_{9/2}$ orbital.

Published
2022

9. Analysis of prognostic factors in COVID-19 hospitalized patients: an Italian single-center case-control study.

Author

CONCISTRÈ, A., PETRAMALA, L., PUGLIANO, C. L., CELI, M., VINCI, F., ASSANTO, E., BARCHETTA, I., PERRONE, E. P., RELLA, S., IANNAZZO, F., ANGHELONI, A., CORAGGIO, L., DI RIENZO, F., MAGGI, D., CIRCOSTA, F., GALARDO, G., MUSCARITOLI, M., and LETIZIA, C.

Abstract

OBJECTIVE: COVID-19 clinical presentation ranges from asymptomatic infection to an inflammatory cytokine storm with multi-organ failure and fatal outcomes. The identification of high-risk patients for severe disease is crucial to plan an early treatment and intensive follow-up. We aimed to investigate negative prognostic factors in a group of patients hospitalized for COVID-19. PATIENTS AND METHODS: 181 patients (90 men and 91 women, mean age 66.56 ± 13.53 years) were enrolled. Each patient received a work-up including medical history, clinical examination, arterial blood gas analysis, laboratory blood tests, feasible ventilatory support required during hospital stay, intensive care setting required, duration of illness and length of hospital stay (>or<25 days). For the assessment of the severity of COVID-19, three main indicators were considered: 1) the intensive care unit (ICU) admission 2) the hospitalization length >25 days; 3) the need of non-invasive ventilation (NIV). RESULTS: The independent risk factor associated with the ICU admission were lactic dehydrogenase elevation (p=0.046), C reactive protein elevation (p=0.014) at hospital admission and direct oral anticoagulant home therapy (p=0.048); for hospital length >25 days: early corticosteroid therapy (p=0.035); for NIV treatment: ferritin elevation at hospital admission (p=0.006). CONCLUSIONS: The presence of the above factors may be useful to identify patients at high risk of developing a severe COVID-19 that need an early treatment and intensive follow-up. [ABSTRACT FROM AUTHOR]

Published
2023

10. Transition strengths in the neutron-rich Ni 73,74,75 isotopes

Author

Gottardo A., De Angelis G., Doornenbal P., Coraggio L., Gargano A., Itaco N., Kaneko K., Van Isacker P., Furumoto T., Benzoni G., Lee J., Liu H., Matsushita M., Mengoni D., Modamio-Hoybjor V., Momiyama S., Motobayashi T., Napoli D. R., Niikura M., Sahin E., Shiga Y., Sakurai H., Taniuchi R., Takeuchi S., Wang H., Valiente-Dobon J. J., Avigo R., Baba H., Blasi N., Bello Garrote F. L., Browne F., Crespi F. C. L., Ceruti S., Daido R., Delattre M. -C., Fang D., Dombradi Z., Isobe T., Kuti I., Lorusso G., Matsui K., Melon B., Miyazaki T., Nishimura S., Orlandi R., Patel Z., Rice S., Sinclair L., Soderstrom P. A., Sohler D., Sumikama T., Taprogge J., Vajta Z., Watanabe H., Wieland O., Wu J., Xu Z. Y., Yalcinkaya M., Yokoyama R., Gottardo, A., De Angelis, G., Doornenbal, P., Coraggio, L., Gargano, A., Itaco, N., Kaneko, K., Van Isacker, P., Furumoto, T., Benzoni, G., Lee, J., Liu, H., Matsushita, M., Mengoni, D., Modamio-Hoybjor, V., Momiyama, S., Motobayashi, T., Napoli, D. R., Niikura, M., Sahin, E., Shiga, Y., Sakurai, H., Taniuchi, R., Takeuchi, S., Wang, H., Valiente-Dobon, J. J., Avigo, R., Baba, H., Blasi, N., Bello Garrote, F. L., Browne, F., Crespi, F. C. L., Ceruti, S., Daido, R., Delattre, M. -C., Fang, D., Dombradi, Z., Isobe, T., Kuti, I., Lorusso, G., Matsui, K., Melon, B., Miyazaki, T., Nishimura, S., Orlandi, R., Patel, Z., Rice, S., Sinclair, L., Soderstrom, P. A., Sohler, D., Sumikama, T., Taprogge, J., Vajta, Z., Watanabe, H., Wieland, O., Wu, J., Xu, Z. Y., Yalcinkaya, M., and Yokoyama, R.

Abstract

Reduced transition probabilities have been measured for the neutron-rich Ni73,74,75 nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined B(E2;0+→2+) value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes B(E2) values have been determined for the first time. In the middle νg9/2 shell nucleus Ni73 three peak candidates have been observed and tentatively assigned to the (5/2+), (13/2+), and (11/2+) excitations. Two peak candidates have been observed in Ni75 and tentatively assigned to the (13/2+) and (11/2+) levels. The measured B(E2) values are in line with the large B(E2) reported in Ni70 and at variance with the small strength measured in Ni72. Excitation energies compare well with the result of large-scale shell-model calculations, while B(E2) values are larger than predicted. This could indicate an increasing contribution of proton excitations across the Z=28 shell closure when approaching Ni78.

Published
2020

11. Early Signal of Emerging Nuclear Collectivity in Neutron-Rich Sb 129

Author

Gray, T. J., Allmond, J. M., Stuchbery, A. E., Yu, C. -H., Baktash, C., Gargano, A., Galindo-Uribarri, A., Radford, D. C., Batchelder, J. C., Beene, J. R., Bingham, C. R., Coraggio, L., Covello, A., Danchev, M., Gross, C. J., Hausladen, P. A., Itaco, N., Krolas, W., Liang, J. F., Padilla-Rodal, E., Pavan, J., Stracener, D. W., Varner, R. L., Gray, T. J., Allmond, J. M., Stuchbery, A. E., Yu, C. -H., Baktash, C., Gargano, A., Galindo-Uribarri, A., Radford, D. C., Batchelder, J. C., Beene, J. R., Bingham, C. R., Coraggio, L., Covello, A., Danchev, M., Gross, C. J., Hausladen, P. A., Itaco, N., Krolas, W., Liang, J. F., Padilla-Rodal, E., Pavan, J., Stracener, D. W., and Varner, R. L.

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Radioactive $^{129}$Sb, which can be treated as a proton plus semi-magic $^{128}$Sn core within the particle-core coupling scheme, was studied by Coulomb excitation. Reduced electric quadrupole transition probabilities, $B(E2)$, for the $2^+$ $\times$ $\pi g_{{7/2}}$ multiplet members and candidate $\pi d_{{5/2}}$ state were measured. The results indicate that the total electric quadrupole strength of $^{129}$Sb is a factor of 1.39(11) larger than the $^{128}$Sn core, which is in stark contrast to the expectations of the empirically successful particle-core coupling scheme. Shell-model calculations performed with two different sets of nucleon-nucleon interactions suggest that this enhanced collectivity is due to constructive quadrupole coherence in the wavefunctions stemming from the proton-neutron residual interactions, where adding one nucleon to a core near a double-shell closure can have a pronounced effect. The enhanced electric quadrupole strength is an early signal of the emerging nuclear collectivity that becomes dominant away from the shell closure., Comment: Accepted, Physical Review Letters

Published
2020

12. Erratum to: Proton-hole and core-excited states in the semi-magic nucleus 131In82

Author

Taprogge, J., Jungclaus, A., Grawe, H., Borzov, I. N., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G. S., Söderström, P. -A., Sumikama, T., Xu, Z. Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H. S., Kameda, D., Kim, G. D., Kim, Y. -K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y. K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bönig, S., Chae, K. Y., Coraggio, L., Daugas, J. -M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F. G., Kröll, T., Lane, G. J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., and Wendt, A.

Published
2016
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16. 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

17. 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

19. Chiral nucleon-nucleon forces in nuclear structure calculations

Author

Coraggio L., Gargano A., Holt J. W., Itaco N., Machleidt R., Marcucci L. E., and Sammarruca F.

Subjects
Physics, QC1-999
Abstract

Realistic nuclear potentials, derived within chiral perturbation theory, are a major breakthrough in modern nuclear structure theory, since they provide a direct link between nuclear physics and its underlying theory, namely the QCD. As a matter of fact, chiral potentials are tailored on the low-energy regime of nuclear structure physics, and chiral perturbation theory provides on the same footing two-nucleon forces as well as many-body ones. This feature fits well with modern advances in ab-initio methods and realistic shell-model. Here, we will review recent nuclear structure calculations, based on realistic chiral potentials, for both finite nuclei and infinite nuclear matter.

Published
2016
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20. Pairing properties of realistic effective interactions

Author

Gargano A., Coraggio L., Covello A., and Itaco N.

Subjects
Physics, QC1-999
Abstract

We investigate the pairing properties of an effective shell-model interaction defined within a model space outside 132Sn and derived by means of perturbation theory from the CD-Bonn free nucleon-nucleon potential. It turns out that the neutron pairing component of the effective interaction is significantly weaker than the proton one, which accounts for the large pairing gap difference observed in the two-valence identical particle nuclei 134Sn and 134Te. The role of the contribution arising from one particle-one hole excitations in determining the pairing force is discussed and its microscopic structure is also analyzed in terms of the multipole decomposition.

Published
2016
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21. Continuum and three-nucleon force in Borromean system: The Ne case

Author

Ma, Y.Z., Xu, F.R., Michel, N., Zhang, S., Li, J.G., Hu, B.S., Coraggio, L., Itaco, N., and Gargano, A.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

Starting from chiral two-nucleon (2NF) and chiral three-nucleon (3NF) potentials, we present a detailed study of $^{17}$Ne, a Borromean system, with the Gamow shell model which can capture continuum effects. More precisely, we take advantage of the normal-ordering approach to include the 3NF and the Berggren representation to treat bound, resonant and continuum states on equal footing in a complex-momentum plane. In our framework, 3NF is essential to reproduce the Borromean structure of $^{17}$Ne, while the continuum is more crucial for the halo property of the nucleus. The two-proton halo structure is demonstrated by calculating the valence proton density and correlation density. The astrophysically interesting 3/2− excited state has its energy above the threshold of the proton emission, and therefore the two-proton decay should be expected from the state.

Published
2020

22. Cardiometabolic multimorbidity is associated with a worse Covid-19 prognosis than individual cardiometabolic risk factors: a multicentre retrospective study (CoViDiab II)

Author

Maddaloni, E., D'Onofrio, L., Alessandri, F., Mignogna, C., Leto, G., Pascarella, G., Mezzaroma, I., Lichtner, M., Pozzilli, P., Agro, F. E., Rocco, M., Pugliese, F., Lenzi, A., Holman, R. R., Mastroianni, C. M., Buzzetti, R., Ajassa, C., Alban, R., Alessi, F., Aronica, R., Belvisi, V., Candy, M., Caputi, A., Carrara, A., Casali, E., Cavallari, E. N., Ceccarelli, G., Celani, L., Ciardi, M. R., Coraggio, L., Curtolo, A., D'Agostino, C., D'Ettorre, G., De Giorgi, F., De Girolamo, G., Filippi, V., Gnessi, L., Luordi, C., Moretti, C., Recchia, G., Ridolfi, M., Romani, F. E., Russo, G., Ruberto, F., Savelloni, G., Siccardi, G., Siena, A., Sterpetti, S., Valeri, S., Vera, M., Volpicelli, L., Watanabe, M., Aiuti, M., Campagna, G., Del Borgo, C., Fondaco, L., Kertusha, B., Leonetti, F., Marocco, R., Masala, R., Zuccala, P., Nonnis, G., Rigoli, A., Strumia, A., and Alampi, D.

Subjects
lcsh:Diseases of the circulatory (Cardiovascular) system, medicine.medical_specialty, multimorbidity, Endocrinology, Diabetes and Metabolism, medicine.medical_treatment, Pneumonia, Viral, pandemics, Logistic regression, metabolic diseases, law.invention, coronavirus infections, male, law, Diabetes mellitus, Internal medicine, middle aged, medicine, 80 and over, copd, covid-19, diabetes, hypertension, sars-cov-2, aged, cardiovascular diseases, diabetes mellitus, female, follow-up studies, humans, pneumonia, viral, prognosis, retrospective studies, risk factors, betacoronavirus, COPD, Original Investigation, Aged, 80 and over, Mechanical ventilation, business.industry, SARS-CoV-2, Confounding, Diabetes, Retrospective cohort study, Odds ratio, medicine.disease, Intensive care unit, lcsh:RC666-701, Hypertension, Cardiology and Cardiovascular Medicine, business, Covid-19
Abstract

Background Cardiometabolic disorders may worsen Covid-19 outcomes. We investigated features and Covid-19 outcomes for patients with or without diabetes, and with or without cardiometabolic multimorbidity. Methods We collected and compared data retrospectively from patients hospitalized for Covid-19 with and without diabetes, and with and without cardiometabolic multimorbidity (defined as ≥ two of three risk factors of diabetes, hypertension or dyslipidaemia). Multivariate logistic regression was used to assess the risk of the primary composite outcome (any of mechanical ventilation, admission to an intensive care unit [ICU] or death) in patients with diabetes and in those with cardiometabolic multimorbidity, adjusting for confounders. Results Of 354 patients enrolled, those with diabetes (n = 81), compared with those without diabetes (n = 273), had characteristics associated with the primary composite outcome that included older age, higher prevalence of hypertension and chronic obstructive pulmonary disease (COPD), higher levels of inflammatory markers and a lower PaO2/FIO2 ratio. The risk of the primary composite outcome in the 277 patients who completed the study as of May 15th, 2020, was higher in those with diabetes (Adjusted Odds Ratio (adjOR) 2.04, 95%CI 1.12–3.73, p = 0.020), hypertension (adjOR 2.31, 95%CI: 1.37–3.92, p = 0.002) and COPD (adjOR 2.67, 95%CI 1.23–5.80, p = 0.013). Patients with cardiometabolic multimorbidity were at higher risk compared to patients with no cardiometabolic conditions (adjOR 3.19 95%CI 1.61–6.34, p = 0.001). The risk for patients with a single cardiometabolic risk factor did not differ with that for patients with no cardiometabolic risk factors (adjOR 1.66, 0.90–3.06, adjp = 0.10). Conclusions Patients with diabetes hospitalized for Covid-19 present with high-risk features. They are at increased risk of adverse outcomes, likely because diabetes clusters with other cardiometabolic conditions.

Published
2020

23. Transition strengths in the neutron-rich $^{73,74,75}$Ni isotopes

Author

Gottardo, A., de Angelis, G., Doornenbal, P., Coraggio, L., Gargano, A., Itaco, N., Kaneko, K., Van Isacker, P., Furumoto, T., Benzoni, G., Lee, J., Liu, H., Matsushita, M., Mengoni, D., Modamio-Hoybjor, V., Momiyama, S., Motobayashi, T., Napoli, D. R., Niikura, M., Sahin, E., Shiga, Y., Sakurai, H., Taniuchi, R., Takeuchi, S., Wang, H., Valiente-Dobòn, J. J., Avigo, R., Baba, H., Blasi, N., Bello Garrote, F. L., Browne, F., Crespi, F. C. L., Ceruti, S., Daido, R., Delattre, M.-C., Fang, D., Dombradi, Zs., Isobe, T., Kuti, I., Lorusso, G., Matsui, K., Melon, B., Miyazaki, T., Nishimura, S., Orlandi, R., Patel, Z., Rice, S., Sinclair, L., Söderström, P. A., Sohler, D., Sumikama, T., Taprogge, J., Vajta, Zs., Watanabe, H., Wieland, O., Wu, J., Xu, Z. Y., Yalcinkaya, M., Yokoyama, R., 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 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), 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 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)

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

International audience; Reduced transition probabilities have been measured for the neutron-rich Ni73,74,75 nuclei with relativistic Coulomb excitation performed at the RIKEN Nishina Center. For the even-even Ni isotope the determined B(E2;0+→2+) value is compatible within errors with the result of a previous intermediate energy Coulomb excitation experiment, although being somewhat larger. For the odd Ni isotopes B(E2) values have been determined for the first time. In the middle νg9/2 shell nucleus Ni73 three peak candidates have been observed and tentatively assigned to the (5/2+), (13/2+), and (11/2+) excitations. Two peak candidates have been observed in Ni75 and tentatively assigned to the (13/2+) and (11/2+) levels. The measured B(E2) values are in line with the large B(E2) reported in Ni70 and at variance with the small strength measured in Ni72. Excitation energies compare well with the result of large-scale shell-model calculations, while B(E2) values are larger than predicted. This could indicate an increasing contribution of proton excitations across the Z=28 shell closure when approaching Ni78.

Published
2020

25. High-spin structure in the transitional nucleus Xe 131: Competitive neutron and proton alignment in the vicinity of the N=82 shell closure

Author

Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Birkenbach, B., Blazhev, A., Coraggio, L., Teruya, E., Yoshinaga, N., Higashiyama, K., Arnswald, K., Bazzacco, D., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F. C. L., De Angelis, G., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Fu, B., GADEA RAGA, ANDRES FRANCISCO, Gargano, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klȩk, K., Hess, H., Hetzenegger, R., Hirsch, R., Itaco, N., 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., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Pullia, A., Queiser, M., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Scarlassara, F., Schneiders, D., Seidlitz, M., Siebeck, B., Smith, J. F., Söderström, P. -A., Stefanini, A. M., Steinbach, T., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J. J., Wolf, K., Zell, K. O., Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Birkenbach, B., Blazhev, A., Coraggio, L., Teruya, E., Yoshinaga, N., Higashiyama, K., Arnswald, K., Bazzacco, D., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F. C. L., De Angelis, G., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Fu, B., Gadea, A., Gargano, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klȩk, K., Hess, H., Hetzenegger, R., Hirsch, R., Itaco, N., 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., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Pullia, A., Queiser, M., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Scarlassara, F., Schneiders, D., Seidlitz, M., Siebeck, B., Smith, J. F., Söderström, P. -A., Stefanini, A. M., Steinbach, T., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J. J., Wolf, K., and Zell, K. O.

Subjects
Nuclear and High Energy Physics
Abstract

The transitional nucleus Xe131 is investigated after multinucleon transfer in the Xe136+Pb208 and Xe136+U238 reactions employing the high-resolution Advanced γ-Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and as an elusive reaction product in the fusion-evaporation reaction Sn124(B11,p3n)Xe131 employing the High-efficiency Observatory for γ-Ray Unique Spectroscopy (HORUS) γ-ray array coupled to a double-sided silicon strip detector at the University of Cologne, Germany. The level scheme of Xe131 is extended to 5 MeV. A pronounced backbending is observed at ω≈0.4MeV along the negative-parity one-quasiparticle νh11/2(α=-1/2) band. The results are compared to the high-spin systematics of the Z=54 isotopes and the N=77 isotones. Large-scale shell-model calculations employing the PQM130, SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings and provide guidance to elucidate the structure of the high-spin states. Further calculations in Xe129-132 provide insight into the changing nuclear structure along the Xe chain towards the N=82 shell closure. Proton occupancy in the π0h11/2 orbital is found to be decisive for the description of the observed backbending phenomenon.

Published
2018

27. Isomer spectroscopy in ¹³³Ba and high-spin structure of ¹³⁴Ba

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., Görgen, A., Gottardo, A., Hadyńska-Klęk, 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., Mijatović, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyak, Zs., Pollarolo, G., Recchia, F., Régis, J.-M., Saed-Samii, N., Şahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J. J., Wolf, K., Yanase, K., Yoshinaga, N., and Zell, K. O.

Abstract

The transitional nuclei ¹³⁴Ba and ¹³³Ba 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 ¹³³Ba 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 ¹³⁴Ba above the Jπ=10⁺ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ℏω=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 ¹³⁴Ba.

Published
2019

29. Identification of high-spin proton configurations in $^{136}\mathrm{Ba}$ and $^{137}\mathrm{Ba}$

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-Klęk, 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., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), 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 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), ILL, 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)-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), and Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; 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

30. Isomer spectroscopy in $^{133}$Ba and high-spin structure of $^{134}$Ba

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., Görgen, A., Gottardo, A., Hadyńska-Klęk, 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., Mijatović, T., Montagnoli, G., Montanari, D., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Régis, J.M., Saed-Samii, N., Şahin, E., Scarlassara, F., Schomacker, K., Seidlitz, M., Siebeck, B., Söderström, P.A., Stefanini, A.M., Stezowski, O., Szilner, S., Szpak, B., Teruya, E., Ur, C., Valiente-Dobón, J.J., Wolf, K., Yanase, K., Yoshinaga, N., Zell, K.O., 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 Laue-Langevin (ILL), ILL, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Structure, multinucleon transfer reactions, structure of Ba isotopes
Abstract

International audience; The transitional nuclei $^{134}$Ba and $^{133}$Ba 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 $^{133}$Ba 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 $^{134}$Ba above the Jπ=10+ isomer is extended to approximately 6 MeV. A pronounced backbending is observed at ℏω=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 $^{134}$Ba.

Published
2019

31. Evolution of collectivity in the 78Ni region: Coulomb excitation of 74Ni at intermediate energies.

Author

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

Subjects
Physics, QC1-999
Abstract

The study of the collective properties of nuclear excitations far from stability provides information about the shell structure at extreme conditions. Spectroscopic observables such as the energy or the transition probabilities of the lowest states, in nuclei with large neutron excess, allow to probe the density and isospin dependence of the effective interaction. Indeed, it was recently shown that tensor and three-body forces play an important role in breaking and creating magic numbers. Emblematic is the case of the evolution of the Ni isotopic chain where several features showed up moving from the most neutron rich stable isotope (64Ni) towards the 78Ni nucleus where the large neutron excess coincides with a double shell closure. In this framework, we have recently performed an experiment with the goal to extract the B(E2; 0+ → 2+) value for the 74Ni nucleus in an intermediate-energy Coulomb excitation experiment: preliminary results are discussed.

Published
2014
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32. Probing core polarization around 78Ni: intermediate energy Coulomb excitation of 74Ni

Author

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

Subjects
Physics, QC1-999
Abstract

The study of the evolution of nuclear shells far from stability provides fundamental information about the shape and symmetry of the nuclear mean field. Nuclei with large neutron/proton ratio allow to probe the density dependence of the effective interaction. Indeed, it was recently shown that tensor and three-body forces play an important role in breaking and creating magic numbers. Of particular interest is the region of 78Ni where the large neutron excess coincides with a double shell closure. We have recently measured the B(E2; 0+ → 2+) of the 74Ni nucleus in an intermediate-energy Coulomb excitation experiment performed at the National Superconducting Cyclotron Laboratory of the Michigan State University. The 74Ni secondary beam has been produced by fragmentation of 86Kr at 140 AMeV on a thick Be target. Selected radioactive fragments impinged on a secondary 197Au target where the measurement of the emitted γ-rays allows to extract the Coulomb excitation cross section and related structure information. Preliminary B(E2) values do not point towards an enhancement of the transition matrix element and the comparison to what was already measured by Aoi and co-workers in [1] opens new scenarios in the interpretation of the shell evolution of the Z=28 isotopes.

Published
2013
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33. Is seniority a partial dynamic symmetry in the first νg9/2 shell?

Author

Morales, A.I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Valiente-Dobón, J.J., Wu, J., Xu, Z.Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F.L., Blasi, N., Bracco, A., Bruce, A.M., Camera, F., Ceruti, S., Crespi, F.C.L., Delattre, M.-C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D.R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P.H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., and Yalcinkaya, M.

Published
2018
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34. Electromagnetic Moments of Radioactive Te-136 and the Emergence of Collectivity 2p circle plus 2n Outside of Double-Magic Sn-132

Author

Allmond, Jm, Stuchbery, Ae, Baktash, C, Gargano, A, Galindo Uribarri, A, Radford, Dc, Bingham, Cr, Brown, Ba, Coraggio, L, Covello, A, Danchev, M, Gross, Cj, Hausladen, Pa, Lagergren, K, Padilla Rodal, E, Pavan, J, Riley, Ma, Stone, Nj, Stracener, Dw, Varner, Rl, Yu, Ch, ITACO, Nunzio, Allmond, Jm, Stuchbery, Ae, Baktash, C, Gargano, A, Galindo Uribarri, A, Radford, Dc, Bingham, Cr, Brown, Ba, Coraggio, L, Covello, A, Danchev, M, Gross, Cj, Hausladen, Pa, Itaco, Nunzio, Lagergren, K, Padilla Rodal, E, Pavan, J, Riley, Ma, Stone, Nj, Stracener, Dw, Varner, Rl, and Yu, Ch

Published
2017

35. High-spin structure in the transitional nucleus 1 131Xe: Competitive neutron and proton alignment in the vicinity of the N = 82 shell closure

Author

Kaya, L, Vogt, A, Reiter, P, Siciliano, M, Birkenbach, B, Blazhev, A, Coraggio, L, Teruya, E, Yoshinaga, N, Higashiyama, K, Arnswald, K, Bazzacco, D, Bracco, A, Bruyneel, B, Corradi, L, Crespi, F, de Angelis, G, Eberth, J, Farnea, E, Fioretto, E, Fransen, C, Fu, B, Gadea, A, Gargano, A, Giaz, A, Görgen, A, Gottardo, A, Hadynska-Klek, Katarzyna, Hess, H, Hetzenegger, R, Hirsch, R, Itaco, N, John, P, Jolie, J, Jungclaus, A, Korten, W, Leoni, S, Lewandowski, L, Lunardi, S, Menegazzo, R, Mengoni, D, Michelagnoli, C, Mijatović, T, Montagnoli, G, Montanari, D, Müller-Gatermann, C, Napoli, D, Podolyak, Zsolt, Pollarolo, G, Pullia, A, Queiser, M, Recchia, F, Rosiak, D, Saed-Samii, N, Şahin, E, Scarlassara, F, Schneiders, D, Seidlitz, M, Siebeck, B, Smith, J, Söderström, P-A, Stefanini, A, Steinbach, T, Stezowski, O, Szilner, S, Szpak, B, Ur, C, Valiente-Dobón, J, Wolf, K, and Zell, K

Abstract

The transitional nucleus 131Xe is investigated after multinucleon transfer (MNT) in the 136Xe+208Pb and 136Xe+238U reactions employing the high-resolution Advanced GAmma Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy and as an elusive reaction product in the fusion-evaporation reaction 124Sn(11B,p3n) 131Xe employing the HORUS γ-ray array coupled to a double-sided silicon strip detector (DSSSD) at the University of Cologne, Germany. The level scheme of 131Xe is extended to 5 MeV. A pronounced backbending is observed at ~ω ≈ 0.4 MeV along the negative-parity one-quasiparticle νh11/2(α = −1/2) band. The results are compared to the high-spin systematics of the Z = 54 isotopes and the N = 77 isotones. Large-scale shell-model calculations (LSSM) employing the PQM130, SN100PN, GCN50:82, SN100-KTH and a realistic effective interaction reproduce the experimental findings and provide guidance to elucidate the structure of the high-spin states. Further calculations in 129−132Xe provide insight into the changing nuclear structure along the Xe chain towards the N = 82 shell closure. Proton occupancy in the π 0h11/2 orbital is found to be decisive for the description of the observed backbending phenomenon.

Published
2018

36. Is seniority a partial dynamic symmetry in the first Shell?

Author

Morales, A.I., Benzoni, G., Watanabe, H., de Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.A., Sumikama, T., Valiente-Dobón, J.J., Wu, J., Xu, Z.Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F.L., Blasi, N., Bracco, A., Bruce, A.M., Camera, F., Ceruti, S., Crespi, F.C.L., Delattre, M.C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D.R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P.H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., and Yalcinkaya, M.

Abstract

The low-lying structures of the midshell νg9/2 Ni isotopes $^{72}$Ni and $^{74}$Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei $^{72}$Co and $^{74}$Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For $^{74}$Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near $^{78}$Ni.

Published
2018

37. Millisecond 23/2(+) isomers in the N=79 isotones Xe-133 and Ba-135

Author

Kaya, L., Vogt, A., Reiter, P., Müller- Gatermann, C., Siciliano, M., Coraggio, L., Itaco, N., Gargano, A., 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., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klęk, 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, Tea, Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Scarlassara, F., Seidlitz, M., Söderström, P.-A., Stefanini, A. M., Stezowski, O., Szilner, Suzana, Szpak, B., Ur, C., Valiente-Dobón, J. J., Weinert, M., Wolf, K., and Zell, K. O.

Subjects
nuclear spetroscopy, shell model
Abstract

Detailed information on isomeric states in A approximate to 135 nuclei is exploited to shell-model calculations in the region northwest of doubly magic nucleus Sn-132. The N = 79 isotones Xe-133 and Ba-135 are studied after multinucleon transfer in the Xe-136 + Pb- 208 reaction employing the high-resolution Advanced GAmma Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy and in a pulsed- beam experiment at the FN tandem accelerator of the University of Cologne Germany utilizing a Be-9 + Te-130 fusion-evaporation reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed gamma-ray spectroscopy. Hitherto tentative excitation energy spin and parity assignments of the 2017-keV J(pi) = 23/2(+) isomer in Xe-133 are confirmed and a half-life of T-1/2 = 8.64(13) ms is measured. The 2388-keV state in Ba-135. is identified as a J(pi) = 23/2(+) isomer with a half-life of 1.06(4) ms. The new results show a smooth onset of isomeric J(pi) = 23/2(+) states along the N = 79 isotones and close a gap in the high-spin systematics towards the recently investigated J(pi) = 23/2(+) isomer in Nd-139. The resulting systematics of M2 reduced transition probabilities is discussed within the of the nuclear shell model. Latest large-scale shell- model calculations employing the SN100PN, GCN50:82, SN100-KTH and a realistic effective interaction reproduce the experimental findings generally well and give insight into the structure of the isomers.

Published
2018

38. High-spin structure in the transitional nucleus $^{131}\mathrm{Xe}$: Competitive neutron and proton alignment in the vicinity of the $N=82$ shell closure

Author

Kaya, L., Vogt, A., Reiter, P., Siciliano, M., Birkenbach, B., Blazhev, A., Coraggio, L., Teruya, E., Yoshinaga, N., Higashiyama, K., Arnswald, K., Bazzacco, D., Bracco, A., Bruyneel, B., Corradi, L., Crespi, F.C.L., de Angelis, G., Eberth, J., Farnea, E., Fioretto, E., Fransen, C., Fu, B., Gadea, A., Gargano, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klęk, K., Hess, H., Hetzenegger, R., Hirsch, R., Itaco, N., 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., Müller-Gatermann, C., Napoli, D., Podolyák, Zs., Pollarolo, G., Pullia, A., Queiser, M., Recchia, F., Rosiak, D., Saed-Samii, N., Şahin, E., Scarlassara, F., Schneiders, D., Seidlitz, M., Siebeck, B., Smith, J.F., Söderström, P.A., Stefanini, A.M., Steinbach, T., Stezowski, O., Szilner, S., Szpak, B., Ur, C., Valiente-Dobón, J.J., Wolf, K., Zell, K.O., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

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

International audience; The transitional nucleus Xe131 is investigated after multinucleon transfer in the Xe136+Pb208 and Xe136+U238 reactions employing the high-resolution Advanced γ-Tracking Array (AGATA) coupled to the magnetic spectrometer PRISMA at the Laboratori Nazionali di Legnaro, Italy, and as an elusive reaction product in the fusion-evaporation reaction Sn124(B11,p3n)Xe131 employing the High-efficiency Observatory for γ-Ray Unique Spectroscopy (HORUS) γ-ray array coupled to a double-sided silicon strip detector at the University of Cologne, Germany. The level scheme of Xe131 is extended to 5 MeV. A pronounced backbending is observed at ℏω≈0.4MeV along the negative-parity one-quasiparticle νh11/2(α=−1/2) band. The results are compared to the high-spin systematics of the Z=54 isotopes and the N=77 isotones. Large-scale shell-model calculations employing the PQM130, SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings and provide guidance to elucidate the structure of the high-spin states. Further calculations in Xe129−132 provide insight into the changing nuclear structure along the Xe chain towards the N=82 shell closure. Proton occupancy in the π0h11/2 orbital is found to be decisive for the description of the observed backbending phenomenon.

Published
2018

39. Is seniority a partial dynamic symmetry in the first ν g 9/2 shell?4

Author

Morales, A. I., Benzoni, G., Watanabe, H., De Angelis, G., Nishimura, S., Coraggio, L., Gargano, A., Itaco, N., Otsuka, T., Tsunoda, Y., Van Isacker, P., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Valiente-Dobón, J. J., Wu, J., Xu, Z. Y., Yagi, A., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F. L., Blasi, N., Bracco, A., Bruce, A. M., Camera, F., Ceruti, S., Crespi, F. C. L., Delattre, M.-C., Dombradi, Zs., Gottardo, A., Isobe, T., Kojouharov, I., Kurz, N., Kuti, I., Lalkovski, S., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Podolyák, Zs., Regan, P. H., Sakurai, H., Sahin, E., Sohler, D., Schaffner, H., Taniuchi, R., Taprogge, J., Vajta, Zs., Wieland, O., and Yalcinkaya, M.

Subjects
ddc:530
Abstract

Physics letters / B B 781, 706 - 712 (2018). doi:10.1016/j.physletb.2018.04.049, Published by North-Holland Publ., Amsterdam

Published
2018

40. Millisecond $23/{2}^{+}$ isomers in the $N=79$ isotones $^{133}\mathrm{Xe}$ and $^{135}\mathrm{Ba}$

Author

Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Siciliano, M., Coraggio, L., Itaco, N., Gargano, A., 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., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadyńska-Klęk, 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., 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., Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Laue-Langevin (ILL), ILL, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), 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)-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), and 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)

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

International audience; Detailed information on isomeric states in A≈135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly magic nucleus Sn132. The N=79 isotones Xe133 and Ba135 are studied after multinucleon transfer in the Xe136+Pb208 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 a pulsed-beam experiment at the FN tandem accelerator of the University of Cologne, Germany utilizing a Be9+Te130 fusion-evaporation reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed γ-ray spectroscopy. Hitherto tentative excitation energy, spin, and parity assignments of the 2107-keV Jπ=23/2+ isomer in Xe133 are confirmed and a half-life of T1/2=8.64(13) ms is measured. The 2388-keV state in Ba135 is identified as a Jπ=23/2+ isomer with a half-life of 1.06(4) ms. The new results show a smooth onset of isomeric Jπ=23/2+ states along the N=79 isotones and close a gap in the high-spin systematics towards the recently investigated Jπ=23/2+ isomer in Nd139. The resulting systematics of M2 reduced transition probabilities is discussed within the framework of the nuclear shell model. Latest large-scale shell-model calculations employing the SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings generally well and give insight into the structure of the isomers.

Published
2018

41. Millisecond 23/2+ isomers in the N = 79 isotones 133Xe and 135Ba

Author

Kaya, L., Vogt, A., Reiter, P., Müller-Gatermann, C., Siciliano, M., Coraggio, L., Itaco, N., Gargano, A., 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., Farnea, E., Fioretto, E., Fransen, C., Gadea, A., Giaz, A., Görgen, A., Gottardo, A., Hadynska-Klek, 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., Mijatovic, T., Montagnoli, G., Montanari, D., Napoli, D., Podolyák, Zs., Pollarolo, G., Recchia, F., Rosiak, D., Saed-Samii, N., Sahin, E., 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
TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY
Abstract

Detailed information on isomeric states in A ≈ 135 nuclei is exploited to benchmark shell-model calculations in the region northwest of doubly-magic nucleus 132Sn. The N = 79 isotones 133Xe and 135Ba are studied after multinucleon transfer (MNT) in the 136Xe + 208Pb 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 a pulsed-beam experiment at the FN tandem accelerator of the University of Cologne, Germany utilizing a 9Be+130Te fusion-evaporation reaction at a beam energy of 40 MeV. Isomeric states are identified via delayed γ-ray spectroscopy. Hitherto tentative excitation energy, spin, and parity assignments of the 2107-keV Jπ = 23/2+ isomer in 133Xe are confirmed and a half-life of T1/2 = 8.64(13) ms is measured. The 2388-keV state in 135Ba is identified as a Jπ = 23/2+ isomer with a half-life of 1.06(4) ms. The new results show a smooth onset of isomeric Jπ = 23/2+ states along the N = 79 isotones and close a gap in the high-spin systematics towards the recently investigated Jπ = 23/2+ isomer in 139Nd. The resulting systematics of M2 reduced transition probabilities is discussed within the framework of the nuclear shell model. Latest large-scale shell-model calculations employing the SN100PN, GCN50:82, SN100-KTH, and a realistic effective interaction reproduce the experimental findings generally well and give insight into the structure of the isomers.

Published
2018

44. Observation of a γ-decaying millisecond isomeric state in 128Cd80

Author

Jungclaus, A., Grawe, H., Nishimura, S., Doornenbal, P., Lorusso, G., Simpson, G.S., Söderström, P.-A., Sumikama, T., Taprogge, J., Xu, Z.Y., Baba, H., Browne, F., Fukuda, N., Gernhäuser, R., Gey, G., Inabe, N., Isobe, T., Jung, H.S., Kameda, D., Kim, G.D., Kim, Y.-K., Kojouharov, I., Kubo, T., Kurz, N., Kwon, Y.K., Li, Z., Sakurai, H., Schaffner, H., Shimizu, Y., Steiger, K., Suzuki, H., Takeda, H., Vajta, Zs., Watanabe, H., Wu, J., Yagi, A., Yoshinaga, K., Benzoni, G., Bönig, S., Chae, K.Y., Coraggio, L., Daugas, J.-M., Drouet, F., Gadea, A., Gargano, A., Ilieva, S., Itaco, N., Kondev, F.G., Kröll, T., Lane, G.J., Montaner-Pizá, A., Moschner, K., Mücher, D., Naqvi, F., Niikura, M., Nishibata, H., Odahara, A., Orlandi, R., Patel, Z., Podolyák, Zs., and Wendt, A.

Published
2017
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45. First observation of gamma rays emitted from excited states south-east of Sn-132: The pi g(9/2)(-1) circle times nu f(7/2) multiplet of In-132(83)

Author

Jungclaus, A, Gargano, A, Grawe, H, Taprogge, J, Nishimura, S, Doornenbal, P, Lorusso, G, Shimizu, Y, Simpson, Gs, Soderstrom, Pa, Sumikama, T, Xu, Zy, Baba, H, Browne, F, Fukuda, N, Gernhauser, R, Gey, G, Inabe, N, Isobe, T, Jung, Hs, Kameda, D, Kim, Gd, Kim, Yk, Kojouharov, I, Kubo, T, Kurz, N, Kwon, Yk, Li, Z, Sakurai, H, Schaffner, H, Steiger, K, Suzuki, H, Takeda, H, Vajta, Z, Watanabe, H, Wu, J, Yagi, A, Yoshinaga, K, Bonig, S, Coraggio, L, Daugas, Jm, Drouet, F, Gadea, A, Ilieva, S, Kroll, T, Montaner Piza, A, Moschner, K, Mucher, D, Nishibata, H, Odahara, A, Orlandi, R, Wendt, A., ITACO, Nunzio, Jungclaus, A, Gargano, A, Grawe, H, Taprogge, J, Nishimura, S, Doornenbal, P, Lorusso, G, Shimizu, Y, Simpson, G, Soderstrom, Pa, Sumikama, T, Xu, Zy, Baba, H, Browne, F, Fukuda, N, Gernhauser, R, Gey, G, Inabe, N, Isobe, T, Jung, H, Kameda, D, Kim, Gd, Kim, Yk, Kojouharov, I, Kubo, T, Kurz, N, Kwon, Yk, Li, Z, Sakurai, H, Schaffner, H, Steiger, K, Suzuki, H, Takeda, H, Vajta, Z, Watanabe, H, Wu, J, Yagi, A, Yoshinaga, K, Bonig, S, Coraggio, L, Daugas, Jm, Drouet, F, Gadea, A, Ilieva, S, Itaco, Nunzio, Kroll, T, Montaner Piza, A, Moschner, K, Mucher, D, Nishibata, H, Odahara, A, Orlandi, R, and Wendt, A.

Subjects
Nuclear Experiment
Abstract

For the first time, the γ decay of excited states has been observed in a nucleus situated in the quadrant south-east of doubly magic 132Sn, a region in which experimental information so far is limited to ground-state properties. Six γ rays with energies of 50, 86, 103, 227, 357, and 602 keV were observed following the β-delayed neutron emission from 133Cd85, populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN within the EURICA project. The new experimental information is compared to the results of a modern realistic shell-model calculation, the first one in this region very far from stability, focusing in particular on the π0g−19/2⊗ ν1f7/2 particle-hole multiplet in 132In83. In addition, theoretical estimates based on a scaling of the two-body matrix elements for the πh11/2⊗ νg9/2 analog multiplet in 208Tl127, one major proton and one major neutron shell above, are presented. ispartof: Physical Review C vol:93 issue:4 pages:1-6 status: published

Published
2016

47. Calculation of Gamow-Teller and Two-Neutrino Double-Beta Decay Properties for 130Te and 136Xe with a realistic nucleon-nucleon potential

Author

Coraggio, L., De Angelis, L., Fukui, T., Gargano, A., and Itaco, N.

Subjects
Nuclear Theory (nucl-th), Nuclear Theory, FOS: Physical sciences, Nuclear Experiment
Abstract

We report on the calculation of Gamow-Teller and double-beta decay properties for nuclei around 132Sn within the framework of the realistic shell model. The effective shell-model Hamiltonian and Gamow-Teller transition operator are derived by way of many-body perturbation theory, without resorting to empirical effective quenching factor for the Gamow-Teller operator. The results are then compared with the available experimental data, in order to establish the reliability of our approach. This is a mandatory step, before we apply the same methodology, in forthcoming studies, to the calculation of the neutrinoless double-beta decay nuclear matrix element for nuclei that are currently considered among the best candidates for the detection of this process., 10 pages, 13 figures, 6 tables, 1 appendix, to be published in Physical Review C

Published
2017

48. Decay properties of Mn-68,Mn-69,Mn-70: Probing collectivity up to N=44 in Fe isotopic chain

Author

Benzoni, G., Morales, A. I., Watanabe, H., Nishimura, S., Coraggio, L., Gargano, A., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Soederstroem, P. A., Sumikama, T., Wu, J., Xu, Z. Y., Yokoyama, R., Baba, H., Avigo, R., Garrote, F. L. Bello, Blasi, N., Bracco, A., Camera, F., Ceruti, S., Crespi, F. C. L., de Angelis, G., Delattre, M. C., Dombradi, Z.s., Gottardo, A., Isobe, T., Kuti, I., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Sakurai, H., Sahin, E., Sohler, D., Taniuchi, R., Taprogge, J., Vajta, Z.s., Valiente Dobon, J. J., Wieland, O., Yalcinkaya, M., ITACO, Nunzio, Benzoni, G., Morales, A. I., Watanabe, H., Nishimura, S., Coraggio, L., Itaco, Nunzio, Gargano, A., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Soederstroem, P. A., Sumikama, T., Wu, J., Xu, Z. Y., Yokoyama, R., Baba, H., Avigo, R., Garrote, F. L. Bello, Blasi, N., Bracco, A., Camera, F., Ceruti, S., Crespi, F. C. L., de Angelis, G., Delattre, M. C., Dombradi, Z. s., Gottardo, A., Isobe, T., Kuti, I., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio Hoybjor, V., Momiyama, S., Napoli, D. R., Niikura, M., Orlandi, R., Sakurai, H., Sahin, E., Sohler, D., Taniuchi, R., Taprogge, J., Vajta, Z. s., Valiente Dobon, J. J., Wieland, O., and Yalcinkaya, M.

Subjects
SHELL-MODEL CALCULATIONS, DEFORMATION, R-PROCESS, NUCLEAR-STRUCTURE
Abstract

The beta decays Mn-68 -> Fe-68 -> Mn-69 -> Fe-69 and Mn-70 -> Fe-70 have been measured at the RIBF facility at RIKEN using the EURICA gamma spectrometer combined with an active stopper consisting of a stack of Si detectors. The nuclei were produced as fission fragments from a beam of U-238 at a bombarding energy of (345) MeV/nucleon impinging on a Be target and selected using the BigRIPS separator. Half-lives and beta-delayed neutron emission probabilities have been extracted for these decays, together with first experimental information on excited states populated in Fe-69,Fe-70. The data indicate a continuously increasing deformation for Fe isotopes up to A = 70. This is interpreted, as for Cr isotopes, in terms of the interplay between the quadrupole correlations of the nu 1d(5/2) and nu 0g(9/2) orbitals and the monopole component of the pi 0f(7/2)-nu 0f(5/2) interaction. (C) 2015 The Authors. Published by Elsevier B.V.

Published
2015

49. Decay properties of 68,69,70Mn: Probing collectivity up to N = 44 in Fe isotopic chain

Author

Benzoni, G., Morales, A.I., Watanabe, H., Nishimura, S., Coraggio, L., Itaco, N., Gargano, A., Browne, F., Daido, R., Doornenbal, P., Fang, Y., Lorusso, G., Patel, Z., Rice, S., Sinclair, L., Söderström, P.-A., Sumikama, T., Wu, J., Xu, Z.Y., Yokoyama, R., Baba, H., Avigo, R., Bello Garrote, F.L., Blasi, N., Bracco, A., Camera, F., Ceruti, S., Crespi, F.C.L., de Angelis, G., Delattre, M.-C., Dombradi, Zs., Gottardo, A., Isobe, T., Kuti, I., Matsui, K., Melon, B., Mengoni, D., Miyazaki, T., Modamio-Hoybjor, V., Momiyama, S., Napoli, D.R., Niikura, M., Orlandi, R., Sakurai, H., Sahin, E., Sohler, D., Taniuchi, R., Taprogge, J., Vajta, Zs., Valiente-Dobón, J.J., Wieland, O., and Yalcinkaya, M.

Published
2015
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