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29 results on '"Di Nitto, A"'

1. Fusion reaction Ca 48 + Bk 249 leading to formation of the element Ts (Z=117)

Author

Khuyagbaatar, J, Yakushev, A, Düllmann, CE, Ackermann, D, Andersson, LL, Asai, M, Block, M, Boll, RA, Brand, H, Cox, DM, Dasgupta, M, Derkx, X, Di Nitto, A, Eberhardt, K, Even, J, Evers, M, Fahlander, C, Forsberg, U, Gates, JM, Gharibyan, N, Golubev, P, Gregorich, KE, Hamilton, JH, Hartmann, W, Herzberg, RD, Heßberger, FP, Hinde, DJ, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Kratz, JV, Krier, J, Kurz, N, Laatiaoui, M, Lahiri, S, Lang, R, Lommel, B, Maiti, M, Miernik, K, Minami, S, Mistry, A, Mokry, C, Nitsche, H, Omtvedt, JP, Pang, GK, Papadakis, P, Renisch, D, Roberto, J, Rudolph, D, Runke, J, Rykaczewski, KP, Sarmiento, LG, Schädel, M, Schausten, B, Semchenkov, A, Shaughnessy, DA, Steinegger, P, Steiner, J, Tereshatov, EE, Thörle-Pospiech, P, Tinschert, K, Torres De Heidenreich, T, Trautmann, N, Türler, A, Uusitalo, J, Ward, DE, Wegrzecki, M, Wiehl, N, Van Cleve, SM, and Yakusheva, V

Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in Ca48 induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing Ca48 with the radioactive target Bk249, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of Ts294. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to Ts293. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019

2. Fusion reaction Ca48+Bk249 leading to formation of the element Ts (Z=117)

Author

Khuyagbaatar, J, Yakushev, A, Düllmann, Ch E, Ackermann, D, Andersson, L-L, Asai, M, Block, M, Boll, RA, Brand, H, Cox, DM, Dasgupta, M, Derkx, X, Di Nitto, A, Eberhardt, K, Even, J, Evers, M, Fahlander, C, Forsberg, U, Gates, JM, Gharibyan, N, Golubev, P, Gregorich, KE, Hamilton, JH, Hartmann, W, Herzberg, R-D, Heßberger, FP, Hinde, DJ, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Kratz, JV, Krier, J, Kurz, N, Laatiaoui, M, Lahiri, S, Lang, R, Lommel, B, Maiti, M, Miernik, K, Minami, S, Mistry, A, Mokry, C, Nitsche, H, Omtvedt, JP, Pang, GK, Papadakis, P, Renisch, D, Roberto, J, Rudolph, D, Runke, J, Rykaczewski, KP, Sarmiento, LG, Schädel, M, Schausten, B, Semchenkov, A, Shaughnessy, DA, Steinegger, P, Steiner, J, Tereshatov, EE, Thörle-Pospiech, P, Tinschert, K, De Heidenreich, T Torres, Trautmann, N, Türler, A, Uusitalo, J, Ward, DE, Wegrzecki, M, Wiehl, N, Van Cleve, SM, and Yakusheva, V

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in Ca48 induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing Ca48 with the radioactive target Bk249, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of Ts294. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to Ts293. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019

3. Low-lying states in Ra 219 and Rn 215: Sampling microsecond α -decaying nuclei

Author

Såmark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D, Andersson, LL, Block, M, Brand, H, Cox, DM, Di Nitto, A, Düllmann, CE, Eberhardt, K, Even, J, Gates, JM, Gerl, J, Gregorich, KE, Gross, CJ, Herzberg, RD, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Omtvedt, JP, Papadakis, P, Runke, J, Rykaczewski, K, Schädel, M, Schaffner, H, Schausten, B, Thörle-Pospiech, P, Trautmann, N, Torres, T, Türler, A, Ward, A, Wiehl, N, and Yakushev, A

Abstract

Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Published
2018

4. Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei

Author

Såmark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D, Andersson, L-L, Block, M, Brand, H, Cox, DM, Di Nitto, A, Düllmann, Ch E, Eberhardt, K, Even, J, Gates, JM, Gerl, J, Gregorich, KE, Gross, CJ, Herzberg, R-D, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Omtvedt, JP, Papadakis, P, Runke, J, Rykaczewski, K, Schädel, M, Schaffner, H, Schausten, B, Thörle-Pospiech, P, Trautmann, N, Torres, T, Türler, A, Ward, A, Wiehl, N, and Yakushev, A

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Published
2018

5. Decay spectroscopy of element 115 daughters:Rg280→Mt276 and Mt276→Bh272

Author

Gates, JM, Gregorich, KE, Gothe, OR, Uribe, EC, Pang, GK, Bleuel, DL, Block, M, Clark, RM, Campbell, CM, Crawford, HL, Cromaz, M, Di Nitto, A, Düllmann, Ch E, Esker, NE, Fahlander, C, Fallon, P, Farjadi, RM, Forsberg, U, Khuyagbaatar, J, Loveland, W, Macchiavelli, AO, May, EM, Mudder, PR, Olive, DT, Rice, AC, Rissanen, J, Rudolph, D, Sarmiento, LG, Shusterman, JA, Stoyer, MA, Wiens, A, Yakushev, A, and Nitsche, H

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Forty-six decay chains, assigned to the decay of 115288, were produced using the Am243(Ca48,3n)115288 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be Rg280 and Mt276, respectively). Upon combining these data with those from 22 115288 decay chains observed in a similar experiment, updated level schemes in Mt276 and Bh272 (populated by the α decay of Rg280 and Mt276, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both Rg280 and Mt276. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.

Published
2015

6. Clustering effects in Ar36 nuclei produced via the Mg24 + C12 reaction

Author

Di Nitto, A., primary, Vardaci, E., additional, Davide, F., additional, La Rana, G., additional, Ashaduzzaman, M., additional, Mercogliano, D., additional, Setaro, P. A., additional, Banerjee, T., additional, Vanzanella, A., additional, Bianco, D., additional, Cinausero, M., additional, Gelli, N., additional, Loffredo, F., additional, and Quarto, M., additional

Published
2023
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8. Dynamical dipole excitation in the fission of a Ca40 + Sm152 composite system

Author

C. Parascandolo, D. Pierroutsakou, R. Alba, A. Del Zoppo, C. Maiolino, D. Santonocito, C. Agodi, V. Baran, A. Boiano, M. Colonna, R. Coniglione, E. De Filippo, A. Di Nitto, U. Emanuele, F. Farinon, A. Guglielmetti, G. Inglima, M. La Commara, G. La Rana, B. Martin, C. Mazzocchi, M. Mazzocco, C. Rizzo, M. Romoli, M. Sandoli, C. Signorini, R. Silvestri, F. Soramel, A. Trifirò, M. Trimarchi, and E. Vardaci

Published
2022
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9. Dynamical dipole excitation in the fission of a Ca40 + Sm152 composite system

Author

Parascandolo, C., primary, Pierroutsakou, D., additional, Alba, R., additional, Del Zoppo, A., additional, Maiolino, C., additional, Santonocito, D., additional, Agodi, C., additional, Baran, V., additional, Boiano, A., additional, Colonna, M., additional, Coniglione, R., additional, De Filippo, E., additional, Di Nitto, A., additional, Emanuele, U., additional, Farinon, F., additional, Guglielmetti, A., additional, Inglima, G., additional, La Commara, M., additional, La Rana, G., additional, Martin, B., additional, Mazzocchi, C., additional, Mazzocco, M., additional, Rizzo, C., additional, Romoli, M., additional, Sandoli, M., additional, Signorini, C., additional, Silvestri, R., additional, Soramel, F., additional, Trifirò, A., additional, Trimarchi, M., additional, and Vardaci, E., additional

Published
2022
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10. Search for elements 119 and 120

Author

Michael Block, Mahananda Dasgupta, S. Minami, Susanta Lahiri, M. Wegrzecki, N. Kurz, Rose A. Boll, Andreas Türler, J. V. Kratz, R-D Herzberg, Daniel Cox, James B. Roberto, Claes Fahlander, Jadambaa Khuyagbaatar, Dirk Rudolph, K. P. Rykaczewski, A. Hübner, G. K. Pang, K. Miernik, N. Gharibyan, B. Schausten, J. Hoffmann, L.-L. Andersson, Bettina Lommel, Luis Sarmiento, U. Forsberg, Matthias Schädel, J. H. Hamilton, Juha Uusitalo, Kenneth E. Gregorich, Heino Nitsche, H. Brand, Julia Even, Moumita Maiti, J. M. Gates, David Hinde, Philippos Papadakis, M. Laatiaoui, Norbert Wiehl, Klaus Eberhardt, W. Hartmann, J. Runke, D. A. Shaughnessy, Dieter Ackermann, Petra Thörle-Pospiech, K. Tinschert, R. Lang, C. Mokry, Birgit Kindler, Jon Petter Omtvedt, Ch. E. Düllmann, S. M. Van Cleve, J. Steiner, D. Renisch, A. K. Mistry, M. Asai, Maurits Evers, Alexander Yakushev, Patrick Steinegger, A. Semchenkov, Pavel Golubev, V. Yakusheva, X. Derkx, Evgeny E. Tereshatov, J. Krier, Norbert Trautmann, T. Torres De Heidenreich, A. Di Nitto, F. P. Heßberger, R. Hollinger, Egon Jäger, Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L. -L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. -D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J. B., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., Yakusheva, V., and Van Swinderen Institute for Particle Physics and G

Subjects
Physics, element 119, 010308 nuclear & particles physics, element 120, Superheavy Elements, 01 natural sciences, Island of stability, Recoil separator, Nuclear physics, superheavy elements, Production cross section, Subatomic Physics, 0103 physical sciences, 540 Chemistry, 570 Life sciences, biology, low and intermediate energy heavy-ion reactions, Atomic number, Irradiation, Sensitivity (control systems), ydinfysiikka, 010306 general physics, Beam energy
Abstract

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the 50Ti+249Bk and 50Ti+249Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the 249Bk target partially decayed into 249Cf, which allowed for a simultaneous search for both elements. Neither was detected at cross-section sensitivity levels of 65 and 200 fb for the 50Ti+249Bk and 50Ti+249Cf reactions, respectively, at a midtarget beam energy of Elab=281.5 MeV. The nonobservation of elements 119 and 120 is discussed within the concept of fusion-evaporation reactions including various theoretical predictions on the fission-barrier heights of superheavy nuclei in the region of the island of stability. peerReviewed

Published
2020
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11. Investigation of fusion probabilities in the reactions with Cr52,54, Ni64 , and Zn68 ions leading to the formation of Z=120 superheavy composite systems

Author

G. N. Knyazheva, I. N. Diatlov, S. V. Khlebnikov, S. Spinosa, Emanuele Vardaci, A. A. Bogachev, Pushpendra Singh, Bettina Lommel, A. Di Nitto, Zouhair Asfari, I. M. Harca, A. Pulcini, N. I. Kozulina, A. Pan, E. M. Kozulin, I. M. Itkis, K. V. Novikov, I. V. Pchelintsev, B. J. P. Gall, W. H. Trzaska, Devendra Kumar, S. Heinz, M. Cheralu, Rudra N. Sahoo, D. M. Filipescu, I. V. Vorobiev, C. Borcea, M. G. Itkis, and H. M. Devaraja

Subjects
Physics, Fusion, 010308 nuclear & particles physics, 0103 physical sciences, Composite number, Physical chemistry, 010306 general physics, 01 natural sciences, Ion
Published
2020
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12. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

C. Petrone, C. Borcea, A. Maj, K. V. Novikov, G. N. Knyazheva, Emanuele Vardaci, V. V. Kirakosyan, A. Bracco, S. Brambilla, G. Sposito, D. Verney, I. M. Harca, D. Quero, K. Saveleva, John W. Wilson, A. Pulcini, S. Calinescu, I. V. Kolesov, M. Ciemala, O. Dorvaux, E. M. Kozulin, F. Camera, I. M. Itkis, O. Stezowski, M. Ashaduzzaman, B. de Canditiis, C. Schmitt, D. Pierroutsakou, A. Di Nitto, P. K. Rath, G. La Rana, C. Parascandolo, N. I. Kozulina, I. Matea, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), 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], Physics, Nuclear reaction, Angular momentum, Photon, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Spectrometer, Mass distribution, 010308 nuclear & particles physics, Coulomb barrier, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, 0103 physical sciences, Nuclear Reactions, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; The overlap in the mass symmetric region of the reaction products from fusion-fission and quasifission complicates the assignment of symmetric events to complete fusion on the basis of the mass distribution alone. Additional observables, besides mass distribution, should be used. The approach proposed here relies on the fact that fusion-fission and quasifission are characterized by different timescales. Within this framework, we performed a detailed study to find out how timescales can be probed via angular momentum transfer as measured via γ-ray multiplicities. The proof of principle was carried out by measuring the γ rays in coincidence with fusion-fission and quasielastic binary fragments in the reaction S32 + Au197 at beam energy near the Coulomb barrier. The experiment was performed at the Accélérateur Linéaire Tandem à Orsay (ALTO) facility at the Institut De Physique Nucléaire (IPN) in Orsay (France) using a detection setup consisting of ORGAM (ORsay GAMma) and PARIS (Photon Array Radioactive Ion Stable beams) γ-detectors arrays coupled with the CORSET (CORrelation SETup) time-of-flight spectrometer. Results of the sensitivity of this method to distinguish reaction channels with different dynamics are discussed.

Published
2020
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13. Search for elements 119 and 120

Author

Khuyagbaatar, J., primary, Yakushev, A., additional, Düllmann, Ch. E., additional, Ackermann, D., additional, Andersson, L.-L., additional, Asai, M., additional, Block, M., additional, Boll, R. A., additional, Brand, H., additional, Cox, D. M., additional, Dasgupta, M., additional, Derkx, X., additional, Di Nitto, A., additional, Eberhardt, K., additional, Even, J., additional, Evers, M., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Gharibyan, N., additional, Golubev, P., additional, Gregorich, K. E., additional, Hamilton, J. H., additional, Hartmann, W., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Hinde, D. J., additional, Hoffmann, J., additional, Hollinger, R., additional, Hübner, A., additional, Jäger, E., additional, Kindler, B., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Laatiaoui, M., additional, Lahiri, S., additional, Lang, R., additional, Lommel, B., additional, Maiti, M., additional, Miernik, K., additional, Minami, S., additional, Mistry, A. K., additional, Mokry, C., additional, Nitsche, H., additional, Omtvedt, J. P., additional, Pang, G. K., additional, Papadakis, P., additional, Renisch, D., additional, Roberto, J. B., additional, Rudolph, D., additional, Runke, J., additional, Rykaczewski, K. P., additional, Sarmiento, L. G., additional, Schädel, M., additional, Schausten, B., additional, Semchenkov, A., additional, Shaughnessy, D. A., additional, Steinegger, P., additional, Steiner, J., additional, Tereshatov, E. E., additional, Thörle-Pospiech, P., additional, Tinschert, K., additional, Torres De Heidenreich, T., additional, Trautmann, N., additional, Türler, A., additional, Uusitalo, J., additional, Wegrzecki, M., additional, Wiehl, N., additional, Van Cleve, S. M., additional, and Yakusheva, V., additional

Published
2020
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14. Investigation of fusion probabilities in the reactions with Cr52,54, Ni64 , and Zn68 ions leading to the formation of Z=120 superheavy composite systems

Author

Novikov, K. V., primary, Kozulin, E. M., additional, Knyazheva, G. N., additional, Itkis, I. M., additional, Itkis, M. G., additional, Bogachev, A. A., additional, Diatlov, I. N., additional, Cheralu, M., additional, Kumar, D., additional, Kozulina, N. I., additional, Pan, A. N., additional, Pchelintsev, I. V., additional, Vorobiev, I. V., additional, Trzaska, W. H., additional, Heinz, S., additional, Devaraja, H. M., additional, Lommel, B., additional, Vardaci, E., additional, Spinosa, S., additional, Di Nitto, A., additional, Pulcini, A., additional, Khlebnikov, S. V., additional, Singh, Pushpendra P., additional, Sahoo, Rudra N., additional, Gall, B., additional, Asfari, Z., additional, Borcea, C., additional, Harca, I., additional, and Filipescu, D. M., additional

Published
2020
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15. Evaporation and fission decay of Er158 composite nuclei within the statistical model

Author

Di Nitto, A., primary, Vardaci, E., additional, La Rana, G., additional, Nadtochy, P. N., additional, Boiano, A., additional, Cinausero, M., additional, Prete, G., additional, Gelli, N., additional, Kozulin, E. M., additional, Knyazheva, G. N., additional, Ordine, A., additional, Davide, F., additional, Parascandolo, C., additional, Pierroutsakou, D., additional, and Pulcini, A., additional

Published
2020
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16. Using γ rays to disentangle fusion-fission and quasifission near the Coulomb barrier: A test of principle in the fusion-fission and quasielastic channels

Author

Vardaci, E., primary, Pulcini, A., additional, Kozulin, E. M., additional, Matea, I., additional, Verney, D., additional, Maj, A., additional, Schmitt, C., additional, Itkis, I. M., additional, Knyazheva, G. N., additional, Novikov, K., additional, Kozulina, N., additional, Harca, I. M., additional, Kolesov, I. V., additional, Saveleva, K., additional, Kirakosyan, V. V., additional, Dorvaux, O., additional, Ciemala, M., additional, Brambilla, S., additional, Ashaduzzaman, M., additional, De Canditiis, B., additional, Di Nitto, A., additional, Quero, D., additional, Parascandolo, C., additional, Pierroutsakou, D., additional, Rath, P. K., additional, Sposito, G., additional, La Rana, G., additional, Bracco, A., additional, Camera, F., additional, Stezowski, O., additional, Borcea, C., additional, Calinescu, S., additional, Petrone, C., additional, and Wilson, J., additional

Published
2020
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17. Fusion reaction Ca48+Bk249 leading to formation of the element Ts ( Z=117 )

Author

Rose A. Boll, G. K. Pang, Daniel Cox, Susanta Lahiri, F. P. Heßberger, J. Hoffmann, Daniel Ward, Evgeny E. Tereshatov, M. Wegrzecki, K. Tinschert, R. Lang, Andreas Türler, J. Krier, Claes Fahlander, C. Mokry, Julia Even, T. Torres De Heidenreich, Egon Jäger, D. Renisch, J. V. Kratz, D. A. Shaughnessy, H. Brand, R. Hollinger, J. M. Gates, Jon Petter Omtvedt, X. Derkx, S. M. Van Cleve, L.-L. Andersson, Philippos Papadakis, S. Minami, Klaus Eberhardt, U. Forsberg, W. Hartmann, A. Di Nitto, Norbert Trautmann, James B. Roberto, N. Kurz, V. Yakusheva, J. Runke, Bettina Lommel, Mahananda Dasgupta, A. Hübner, Alexander Yakushev, Matthias Schädel, Kenneth E. Gregorich, Patrick Steinegger, B. Schausten, H. Nitsche, Birgit Kindler, Luis Sarmiento, Juha Uusitalo, Maurits Evers, Dirk Rudolph, K. Miernik, R.-D. Herzberg, Ch. E. Düllmann, N. Gharibyan, A. Semchenkov, Pavel Golubev, Dieter Ackermann, Petra Thörle-Pospiech, J. Steiner, A. K. Mistry, M. Asai, David Hinde, Michael Block, M. Laatiaoui, Norbert Wiehl, K. P. Rykaczewski, J. H. Hamilton, Jadambaa Khuyagbaatar, and Moumita Maiti

Subjects
Physics, Nuclear physics, Nuclear Theory, Nuclear fusion, Decay chain, Alpha decay, Actinide, Superheavy Elements, Nuclear Experiment, Recoil separator
Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in 48Ca induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing 48Ca with the radioactive target 249Bk, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of 294Ts. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to 293Ts. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019
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18. Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei

Author

Alexander Yakushev, Ingemar Ragnarsson, N. Kurz, Julia Even, K. P. Rykaczewski, T. Torres, Carl J Gross, I. Kojouharov, Andreas Türler, R.-D. Herzberg, Dirk Rudolph, J. P. Omtvedt, Jörg Runke, B. Schausten, Luis Sarmiento, J. Krier, F. P. Heßberger, Pavel Golubev, Ch. E. Düllmann, J. M. Gates, Birgit Kindler, L.-L. Andersson, Michael Block, J. V. Kratz, B. G. Carlsson, Norbert Wiehl, Bettina Lommel, Klaus Eberhardt, Dieter Ackermann, Petra Thörle-Pospiech, Norbert Trautmann, Egon Jäger, H. Schaffner, Claes Fahlander, Kenneth E. Gregorich, J. Gerl, Matthias Schädel, A. Di Nitto, A. Ward, U. Forsberg, C. Mokry, J Ljungberg, A. Såmark-Roth, Philippos Papadakis, H. Brand, A. K. Mistry, Jadambaa Khuyagbaatar, and Daniel Cox

Subjects
Physics, 010308 nuclear & particles physics, Nuclear shell model, Half-life, 01 natural sciences, Nuclear physics, Microsecond, 0103 physical sciences, Atomic nucleus, Gamma spectroscopy, Alpha decay, Decay chain, Nuclide, 010306 general physics
Abstract

Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations. (Less)

Published
2018
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19. Fission dynamics of intermediate-fissility systems: A study within a stochastic three-dimensional approach

Author

A. Di Nitto, G. N. Knyazheva, G. Prete, D. Fabris, R. Moro, Nicla Gelli, A. Brondi, G. La Rana, M. Cinausero, E. M. Kozulin, P. K. Rath, G. Montagnoli, Emanuele Vardaci, I. M. Itkis, M. Ashaduzzaman, P. N. Nadtochy, Vardaci, Emanuele, Nadtochy, P. N., DI NITTO, Antonio, Brondi, Augusto, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, Rath, PRASANTA KUMAR, Ashaduzzaman, Md, Kozulin, E. M., Knyazheva, G. N., Itkis, I. M., Cinausero, M., Prete, G., Fabris, D., Montagnoli, G., and Gelli, N.

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Fissility, Fission, Dynamics (mechanics)
Abstract

The system of intermediate fissility Ce-132 has been studied experimentally and theoretically to investigate the dissipation properties of nuclear matter. Cross sections of fusion-fission and evaporation-residue channels together with light charged particle multiplicities in both channels, their spectra, light charged particle-evaporation residue angular correlations, and mass-energy distribution of fission fragments have been measured. Theoretical analysis has been performed using a multidimensional stochastic approach coupled with a Hauser-Feshbach treatment of particle evaporation. The main conclusions are that the full one-body shape-dependent dissipation mechanism allows the reproduction of the full set of experimental data and that after a time tau(d) = 5 x 10(-21) s from the equilibrium configuration of the compound nucleus, fission decay can occur in a time that can span several orders of magnitude.

Published
2015
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20. Clustering effects inCr48composite nuclei produced via theMg24+Mg24reaction

Author

R. Moro, G. Prete, A. Vanzanella, A. Di Nitto, M. Cinausero, G. La Rana, N. Gelli, P. N. Nadtochy, Emanuele Vardaci, and A. Brondi

Subjects
Physics, Angular momentum, 010308 nuclear & particles physics, Resonance, 01 natural sciences, Charged particle, Spectral line, Semi-empirical mass formula, 0103 physical sciences, Cluster (physics), Atomic physics, 010306 general physics, Energy (signal processing), Excitation
Abstract

The nuclear properties of $^{48}\mathrm{Cr}$ composite $\ensuremath{\alpha}$-like nuclei produced at 60 MeV of excitation energy via the $^{24}\mathrm{Mg}+^{24}\mathrm{Mg}$ reaction were investigated. This excitation energy corresponds to a resonance with a narrow width (170 keV) observed in the elastic and inelastic channels, which was interpreted as a highly deformed state. To gain insight on the deformation of this state exclusive measurements of light charged particles were carried out with $8\ensuremath{\pi}\mathrm{LP}$ apparatus at Laboratori Nazionali di Legnaro and compared to statistical model predictions. The measured of $\ensuremath{\alpha}$-particle energy spectra, $\ensuremath{\alpha}$-evaporation residues, $\ensuremath{\alpha}\text{\ensuremath{-}}\ensuremath{\alpha}$, and $\ensuremath{\alpha}\text{\ensuremath{-}}\ensuremath{\alpha}\text{\ensuremath{-}}\ensuremath{\alpha}$ correlations indicate the limitation of the rotating liquid drop model in describing the nuclear shape of the compound nucleus along the decay cascade. To reproduce the full set of experimental data very elongated nuclear shapes had to be considered, with an axis ratio $3:1$ at the resonance angular momentum. This large deformation is consistent with previous findings for $\ensuremath{\alpha}$-like nuclei and with the predictions of the cranked cluster model.

Published
2016
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21. Decay spectroscopy of element 115 daughters:Rg280→Mt276andMt276→Bh272

Author

R. M. Clark, Alexander Yakushev, G.K. Pang, Luis Sarmiento, D. T. Olive, M. Cromaz, P. R. Mudder, W. Loveland, A. C. Rice, K. E. Gregorich, Dirk Rudolph, Claes Fahlander, E. C. Uribe, C. M. Campbell, D. L. Bleuel, Andreas Wiens, A. O. Macchiavelli, O. Gothe, E. M. May, P. Fallon, A. Di Nitto, N. E. Esker, Ch. E. Düllmann, R. M. Farjadi, H. L. Crawford, Heino Nitsche, Jadambaa Khuyagbaatar, J. Rissanen, M. A. Stoyer, U. Forsberg, J. M. Gates, Jennifer A. Shusterman, and Michael Block

Subjects
Physics, Nuclear and High Energy Physics, Photon, Decay scheme, Cyclotron, Compton scattering, law.invention, Nuclear physics, law, Gamma spectroscopy, Alpha decay, Decay chain, Atomic physics, Spectroscopy
Abstract

Forty-six decay chains, assigned to the decay of 288-115, were produced using the 243Am(48Ca,3n)288-115 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be 280Rg and 276Mt, respectively). Upon combining these data with those from 22 288-115 decay chains observed in a similar experiment, updated level schemes in 276Mt and 272Bh (populated by the α decay of 280Rg and 276Mt, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both 280Rg and 276Mt. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies. (Less)

Published
2015
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22. Spectroscopy of the neutron-deficientN=50nucleusRh95

Author

Torbjörn Bäck, István Kuti, Dóra Sohler, Maria Doncel, Johan Nyberg, B. M. Nyakó, D. R. Napoli, A. Atac, V. Modamio, Bulent Yilmaz, A. Di Nitto, T. W. Henry, Roberto Liotta, A. Gengelbach, Emyr Clement, Gábor Kalinka, M. Palacz, A. J. Nichols, Chong Qi, J. Gál, K. Juhász, Eiji Ideguchi, R. Wadsworth, F. Ghazi Moradi, A. Dijon, Jozsef Molnar, P. R. John, Bo Cederwall, T. Hüyük, A. Gottardo, János Timár, Zsolt Dombrádi, H. Al-Azri, G. Jaworski, A. Johnson, and O. Aktas

Subjects
Physics, Nuclear and High Energy Physics, Spins, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, 7. Clean energy, Nuclear physics, medicine.anatomical_structure, Neutron number, medicine, Physics::Accelerator Physics, Neutron, Atomic physics, Nuclear Experiment, Spectroscopy, Beam energy, Nucleus
Abstract

The neutron-deficient semimagic (neutron number N = 50) Rh-95 nucleus has been produced at high spins using the projectile-target system Ca-40 + Ni-58 at 125 MeV beam energy. The gamma-decays of le ...

Published
2014
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23. Character of particle-hole excitations in94Ru deduced fromγ-ray angular correlation and linear polarization measurements

Author

O. Aktas, Torbjörn Bäck, A. Di Nitto, A. Gottardo, János Timár, Zsolt Dombrádi, K. Juhász, Chong Qi, Eiji Ideguchi, B. M. Nyakó, P. R. John, A. Johnson, Bulent Yilmaz, Roberto Liotta, T. Hüyük, A. Atac, Emyr Clement, A. Dijon, H. Al-Azri, T. W. Henry, Dóra Sohler, Maria Doncel, A. Gengelbach, V. Modamio, Bo Cederwall, R. Wadsworth, István Kuti, D. R. Napoli, G. Jaworski, M. Palacz, A. J. Nichols, Johan Nyberg, S. M. Lenzi, and F. Ghazi Moradi

Subjects
Physics, Nuclear and High Energy Physics, medicine.anatomical_structure, Angular correlation, Linear polarization, Excited state, Yrast, medicine, Neutron, Parity (physics), Atomic physics, Nucleus, Excitation
Abstract

Linear polarization and angular correlations of gamma-rays depopulating excited states in the neutron-deficient nucleus Ru-94(44)50 have been measured, enabling firm spin-parity assignments for several excited states in this nucleus. The deduced multipolarities of strong transitions in the yrast structure were found to be mostly of stretched M1, E1, and E2 types and, in most cases, in agreement with previous tentative assignments. The deduced multipolarity of the 1869 keV and the connecting 257 and 1641 keV transitions indicates that the state at 6358 keV excitation energy has spin parity 12(1)(-) rather than 12(3)(+) as proposed in previous works. The presence of a 12(1)(-) state is interpreted within the framework of large-scale shell-model calculations as a pure proton-hole state dominated by the pi(p(1/2)(-1)circle times g(9/2)(-5)) and pi(p(3/2)(-1) g(9/2)(-5)) configurations. A new positive-parity state is observed at 6103 keV and is tentatively assigned as 12(2)(+). The 14(1)(-) state proposed earlier is reassigned as 13(4)(-) and is interpreted as being dominated by neutron particle-hole core excitations. The strengths of several E1 transitions have been measured and are found to provide a signature of core-excited configurations.

Published
2014
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25. Fission dynamics of intermediate-fissility systems: A study within a stochastic three-dimensional approach

Author

Vardaci, E., primary, Nadtochy, P. N., additional, Di Nitto, A., additional, Brondi, A., additional, La Rana, G., additional, Moro, R., additional, Rath, P. K., additional, Ashaduzzaman, M., additional, Kozulin, E. M., additional, Knyazheva, G. N., additional, Itkis, I. M., additional, Cinausero, M., additional, Prete, G., additional, Fabris, D., additional, Montagnoli, G., additional, and Gelli, N., additional

Published
2015
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26. Spectroscopy of the neutron-deficientN=50nucleusRh95

Author

Ghazi Moradi, F., primary, Cederwall, B., additional, Qi, C., additional, Bäck, T., additional, Ataç, A., additional, Liotta, R., additional, Doncel, M., additional, Johnson, A., additional, de France, G., additional, Clément, E., additional, Nyberg, J., additional, Gengelbach, A., additional, Nyakó, B. M., additional, Gál, J., additional, Kalinka, G., additional, Molnár, J., additional, Timár, J., additional, Sohler, D., additional, Dombrádi, Zs., additional, Kuti, I., additional, Juhász, K., additional, Napoli, D. R., additional, Gottardo, A., additional, Modamio, V., additional, Wadsworth, R., additional, Henry, T. W., additional, Nichols, A. J., additional, Al-Azri, H., additional, Palacz, M., additional, Ideguchi, E., additional, Aktas, Ö., additional, Di Nitto, A., additional, Dijon, A., additional, Hüyük, T., additional, Jaworski, G., additional, John, P. R., additional, and Yilmaz, B., additional

Published
2014
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27. Character of particle-hole excitations in94Ru deduced fromγ-ray angular correlation and linear polarization measurements

Author

Ghazi Moradi, F., primary, Qi, C., additional, Cederwall, B., additional, Ataç, A., additional, Bäck, T., additional, Liotta, R., additional, Doncel, M., additional, Johnson, A., additional, de France, G., additional, Clément, E., additional, Dijon, A., additional, Wadsworth, R., additional, Henry, T. W., additional, Nichols, A. J., additional, Al-Azri, H., additional, Nyberg, J., additional, Gengelbach, A., additional, Hüyük, T., additional, Nyakó, B. M., additional, Timár, J., additional, Sohler, D., additional, Dombrádi, Zs., additional, Kuti, I., additional, Juhász, K., additional, Palacz, M., additional, Jaworski, G., additional, Lenzi, S. M., additional, John, P. R., additional, Napoli, D. R., additional, Gottardo, A., additional, Modamio, V., additional, Di Nitto, A., additional, Yilmaz, B., additional, Aktas, Ö., additional, and Ideguchi, E., additional

Published
2014
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28. γ-ray linear polarization measurements and(g9/2)−3neutron alignment in91Ru

Author

Zheng, Y., primary, de France, G., additional, Clément, E., additional, Dijon, A., additional, Cederwall, B., additional, Wadsworth, R., additional, Bäck, T., additional, Ghazi Moradi, F., additional, Jaworski, G., additional, Nyakó, B. M., additional, Nyberg, J., additional, Palacz, M., additional, Al-Azri, H., additional, de Angelis, G., additional, Atac, A., additional, Aktaş, Ö., additional, Bhattacharyya, S., additional, Brock, T., additional, Davies, P. J., additional, Di Nitto, A., additional, Dombrádi, Zs., additional, Gadea, A., additional, Gál, J., additional, Joshi, P., additional, Juhász, K., additional, Julin, R., additional, Jungclaus, A., additional, Kalinka, G., additional, Kownacki, J., additional, La Rana, G., additional, Lenzi, S. M., additional, Molnár, J., additional, Moro, R., additional, Napoli, D. R., additional, Nara Singh, B. S., additional, Persson, A., additional, Recchia, F., additional, Sandzelius, M., additional, Scheurer, J.-N., additional, Sletten, G., additional, Sohler, D., additional, Söderström, P.-A., additional, Taylor, M. J., additional, Timár, J., additional, Valiente-Dobon, J. J., additional, and Vardaci, E., additional

Published
2013
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29. Clustering effects in 48Cr composite nuclei produced via the 24Mg+24Mg reaction.

Author

Di Nitto, A., Vardaci, E., Brondi, A., La Rana, G., Cinausero, M., Gelli, N., Moro, R., Nadtochy, P. N., Prete, G., and Vanzanella, A.

Subjects
*CHROMIUM, *ANGULAR momentum (Nuclear physics), *MAGNESIUM ions
Abstract

The nuclear properties of 48Cr composite α-like nuclei produced at 60 MeV of excitation energy via the 24Mg+24Mg reaction were investigated. This excitation energy corresponds to a resonance with a narrow width (170 keV) observed in the elastic and inelastic channels, which was interpreted as a highly deformed state. To gain insight on the deformation of this state exclusive measurements of light charged particles were carried out with 8πLP apparatus at Laboratori Nazionali di Legnaro and compared to statistical model predictions. The measured of α-particle energy spectra, α-evaporation residues, α-α, and α-α-α correlations indicate the limitation of the rotating liquid drop model in describing the nuclear shape of the compound nucleus along the decay cascade. To reproduce the full set of experimental data very elongated nuclear shapes had to be considered, with an axis ratio 3:1 at the resonance angular momentum. This large deformation is consistent with previous findings for α-like nuclei and with the predictions of the cranked cluster model. [ABSTRACT FROM AUTHOR]

Published
2016
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