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Your search keyword '"Rose A. Boll"' showing total 7 results
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7 results on '"Rose A. Boll"'

1. 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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2. Experimental Study of the 249-251Cf + 48Ca Reactions: Toward the Magic Neutron Number N=184

Author

S. M. Van Cleve, M. G. Itkis, Grigory K. Vostokin, S. N. Dmitriev, Robert Grzywacz, D. C. McInturff, G. D. Owen, M. A. Stoyer, A. G. Popeko, James B. Roberto, A. I. Svirikhin, V. G. Subbotin, E. H. Smith, Rose A. Boll, R. N. Sagaidak, C. S. White, Yu. Ts. Oganessian, A. M. Sukhov, A. A. Voinov, N. T. Brewer, K. Miernik, A. N. Polyakov, K. P. Rykaczewski, Julie G. Ezold, J. H. Hamilton, Nathan J. Sims, N. D. Kovrizhnykh, D. J. Dean, V. K. Utyonkov, L. K. Felker, M. V. Shumeiko, Yu. S. Tsyganov, F. Sh. Abdullin, A. V. Sabelnikov, and I. V. Shirokovsky

Subjects
Physics, Nuclear physics, Neutron number, Magic (programming)
Published
2019
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3. 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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4. Search for the heaviest atomic nuclei among the products from reactions of mixed-Cf with a Ca48 beam

Author

Robert Grzywacz, I. V. Shirokovsky, A. V. Sabelnikov, M. G. Itkis, A. A. Voinov, S. N. Dmitriev, N. T. Brewer, K. Miernik, F. Sh. Abdullin, A. N. Polyakov, Nathan J. Sims, K. P. Rykaczewski, Julie G. Ezold, S. M. Van Cleve, J. H. Hamilton, G. D. Owen, R. N. Sagaidak, M. V. Shumeiko, A. I. Svirikhin, A. M. Sukhov, E. H. Smith, L. K. Felker, N. D. Kovrizhnykh, V. G. Subbotin, Rose A. Boll, A. G. Popeko, Yu. S. Tsyganov, D. J. Dean, V. K. Utyonkov, C. S. White, Yu. Ts. Oganessian, James B. Roberto, M. A. Stoyer, Grigory K. Vostokin, and D. C. McInturff

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Detector, chemistry.chemical_element, Californium, 01 natural sciences, Recoil separator, Nuclear physics, chemistry, 0103 physical sciences, Atomic nucleus, Irradiation, Decay chain, Nuclear Experiment, 010306 general physics, Beam (structure)
Abstract

The search for new decay chains of oganesson isotopes is presented. The experiment utilized the Dubna Gas Filled Recoil Separator and a highly segmented recoil-decay detection system. The signals from all detectors were analyzed in parallel by digital and analog data acquisition systems. For the first time, a target of mixed californium (51% Cf249, 13% Cf250, and 36% Cf251) recovered from decayed Cf252 sources was produced and irradiated with an intense Ca48 beam. The observation of a new decay chain of Og294 is reported. The prospects for reaching new isotopes Og295,296 are discussed.

Published
2018
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5. Actinide targets for the synthesis of super-heavy elements

Author

Susan L. Hogle, K. P. Rykaczewski, Rose A. Boll, Julie G. Ezold, L. K. Felker, James B. Roberto, Jonathan D. Burns, and C.W. Alexander

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Berkelium, chemistry, business.industry, Einsteinium, chemistry.chemical_element, Transactinide element, Californium, Actinide, Process engineering, business
Abstract

Since 2000, six new super-heavy elements with atomic numbers 113 through 118 have been synthesized in hot fusion reactions of 48Ca beams on actinide targets. These target materials, including 242Pu, 244Pu, 243Am, 245Cm, 248Cm, 249Cf, and 249Bk, are available in very limited quantities and require specialized production and processing facilities resident in only a few research centers worldwide. This report describes the production and chemical processing of heavy actinide materials for super-heavy element research, current availabilities of these materials, and related target fabrication techniques. The impact of actinide materials in super-heavy element discovery is reviewed, and strategies for enhancing the production of rare actinides including 249Bk, 251Cf, and 254Es are described.

Published
2015
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6. Ca48+Bk249Fusion Reaction Leading to ElementZ=117: Long-Livedα-DecayingDb270and Discovery ofLr266

Author

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

Subjects
Nuclear physics, Physics, Isotope, Atomic nucleus, General Physics and Astronomy, Nuclear fusion, Decay chain, Atomic number, Atomic physics, Radioactive decay, Recoil separator, Spontaneous fission
Abstract

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope 294-117 and its decay products. A hitherto unknown α-decay branch in 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4 h) α-emitter 270Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an “island of stability.” (Less)

Published
2014
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7. Study of the properties of the superheavy nuclei Z = 117 produced in the 249Bk + 48Ca reaction

Author

F. Sh. Abdullin, M. A. Stoyer, I. V. Shirokovsky, K. P. Rykaczewski, J. M. Gostic, A. A. Voinov, A. V. Ramayya, Grigory K. Vostokin, M. V. Shumeiko, Julie G. Ezold, Robert Grzywacz, Kenton J. Moody, M. A. Ryabinin, J. H. Hamilton, J. Binder, Yu. S. Tsyganov, D. A. Shaughnessy, K. Miernik, A. N. Polyakov, C.W. Alexander, K. Felker, Roger Henderson, V. K. Utyonkov, David Miller, R. N. Sagaidak, A. M. Sukhov, James B. Roberto, Yu. Ts. Oganessian, M. G. Itkis, V. G. Subbotin, S. N. Dmitriev, N. J. Stoyer, and Rose A. Boll

Subjects
Nuclear physics, Isotope, Chemistry, Projectile, Physics, QC1-999, Atomic physics, Beam (structure), Excitation, Spectral line
Abstract

The reaction of 249 Bk with 48 Ca have been reinvestigated to provide new evidence for the discovery of element 117 on a larger number of events. The experiments were performed at five projectile energies and with a total beam dose of 48 Ca of about 4.6×10 19 . Two isotopes 293,294 117 were synthesized in the 249 Bk+ 48 Ca reaction, providing excitation functions and α-decay spectra of the produced isotopes that establishes these nuclei to be the products of the 4n- and 3n-evaporation channels, respectively. Decay properties of 293,294 117 and of all the daughter products agree with the data of the experiment in which these nuclei were synthesized for the first time in 2010. The new 289 115 events, populated by α decay of 293 117, demonstrate the same decay properties as those observed for 289 115 produced in the 243 Am( 48 Ca,2n) reaction thus providing cross- bombardment evidence. In addition, a single decay of 294 118 was observed from the reaction with 249 Cf - a result of the in-growth of 249 Cf in the 249 Bk target.

Published
2014

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