30 results on '"Gross, C."'
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2. Recoil-alpha-fission and Recoil-alpha-alpha-fission Chains Stemming from Element 115
- Author
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Rudolph, D., Forsberg, U., Andersson, L., Block, M., Brand, H., Crox, D., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Fahlander, C., Gates, J. M., Düllmann, C. E., Gerl, J., Gregorich, E. K., Gross, C. J., Herzberg, R., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Golubev, P., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, K., Schädel, M., Schaffner, H., Schausten, B., Hessberger, F., Thörle-Pospiech, P., Torres de Heidenreich, T., Traut, T., Trautmann, N., Thürler, A., Ward, A., Wiehl, N., Khuyagbaatar, J., Kratz, J. V., Sarmiento, L. G., Yakushev, A., and Ackermann, D.
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Physics ,Subatomic Physics - Abstract
GSI Scientific Report 2014 - GSI Report 2015-1
- Published
- 2015
3. Element 115 studied with TASISpec
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Rudolph, D., Forsberg, U., Gross, C. J., Herzberg, R.-D., Heßberger, F., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schädel, M., Aberg, S., Ackermann, D., Block, M., Golubev, P., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Sarmiento, L. G., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Yakushev, A., Runke, J., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., Andersson, L.-L., Wiehl, N., Di Nitto, A., Düllmann, C. E., Gates, J. M., and Gregorich, K. E.
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Physics - Abstract
GSI Scientific Report 2013 - GSI Report 2014-1
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- 2014
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4. De Sitter vacua and inflation in no-scale string models
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Gross, C.
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Physics ,Dissertation - Published
- 2009
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5. Interplay of equilibrium and nonequilibrium phenomena in the nuclear liquid-gas phase transition
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Zwieglinski, B., Odeh, T., Gross, C., Schwarz, C., Bassini, R., Begemann-Blaich, M., Fritz, S., Gaff-Ejakov, S. J., Gourio, D., Immé, G., Iori, I., Kleinevoss, U., Kunde, G. J., Kunze, W. D., Lynen, U., Maddalena, V., Mahi, M., Moroni, A., Möhlenkamp, T., Müller, W. F. J., Nociforo, C., Ocker, B., Petruzzelli, F., Pochodzalla, J., Raciti, G., Giorgio Maria Riccobene, Romano, F. P., Saija, A., Sann, H., Schnittker, M., Schüttauf, A., Seidel, W., Serfling, V., Sfienti, C., Trautmann, W., Trzcinski, A., Verde, G., Wörner, A., and Xi, H.
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Physics ,Nuclear and High Energy Physics ,Phase transition ,Liquid gas ,Non-equilibrium thermodynamics ,Thermodynamics ,STATISTICAL MULTIFRAGMENTATION ,GOLD ,Nuclear Experiment - Abstract
Energy spectra of protons emitted by the target residue in Au+Au collisions at 1 GeV/u reveal two components with different slopes attributed to preequilibrium and equilibrium emission. The relative contribution of the latter decreases rapidly with excitation energy, so that its presence becomes not apparent for the highest energy bins. It is argued therefore, that equilibrium may not be reached on the gas branch of the caloric curve. The nuclear liquid-gas phase transition thus belongs to the category of nonequilibrium phase transitions for which the concepts developed in synergetics, such as self-organized criticality, provide the proper framework.
- Published
- 2001
6. Structure Of Rare-Earth Nuclei Around The Proton Drip Line.
- Author
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Rykaczewski, K. P., Grzywacz, R. K., Bingham, C. R., Danchev, M., Mazzocchi, C., Tantawy, M. N., Gross, C. J., Yu, C. H., Batchelder, J. C., Karny, M., Królas, W., Fong, D., Hamilton, J. H., Ramayya, A. V., Piechaczek, A., Zganjar, E., Winger, J. A., Ginter, T. N., Stolz, A., and Hagino, K.
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RARE earth nuclei ,ELECTRONS ,PROTONS ,RADIOACTIVITY ,NUCLEAR reactions ,PHYSICS - Abstract
Decay studies on rare earth nuclei around the proton drip line have been performed by means of the Recoil Mass Spectrometer at the Holifield Radioactive Ion Beam Facility in Oak Ridge. The proton emission from the odd-odd N=77 isotone 146Tm was reinvestigated, resulting in the assignment of the 1.01 MeV proton line to the decay of a short-lived 146Tm state. A new proton radioactivity of 144Tm was identified. The decays of isomeric levels in the N=77 isotones, 140Eu, 142Tb and 144Ho were remeasured using γ and electron detectors. The analysis of the structure of studied nuclei, which accounts for the coupling between the protons and neutrons and for core excitations, is presented. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]
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- 2005
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7. Coulomb excitation measurements of transition strengths in the isotopes 132,134Sn.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Varner, R. L., Beene, J. R., Baktash, C., Galindo-Uribarri, A., Gross, C. J., Gomez del Campo, J., Halbert, M. L., Hausladen, P. A., Larochelle, Y., Liang, J. F., Mas, J., Mueller, P. E., Padilla-Rodal, E., Radford, D. C., Shapira, D., Stracener, D. W., and Urrego-Blanco, J. -P.
- Abstract
We describe an experiment optimized to determine the transition probabilities for excitation of the first excited 2+ state in 132Sn. The large excitation energy (4.04 MeV) and consequent small excitation cross-section, together with the modest beam intensity available makes this a challenging experiment. The preliminary result is B(E2; 0+ → 2+) = 0.11 ± 0.03e2b2. The high efficiency and generalized nature of the setup enabled us to also measure the first 2+ state in the two-neutron nucleus 134Sn. We have determined a value of B(E2; 0+ → 2+) = 0.029 ± 0.005e2b2 which shows no sign of the asymmetry with respect to the N = 82 shell closure exhibited by the Te isotopes. [ABSTRACT FROM AUTHOR]
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- 2005
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8. Coulomb excitation and transfer reactions with neutron-rich radioactive beams.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Radford, D. C., Baktash, C., Barton, C. J., Batchelder, J., Beene, J. R., Bingham, C. R., Caprio, M. A., Danchev, M., Fuentes, B., Galindo-Uribarri, A., Gomez del Campo, J., Gross, C. J., Halbert, M. L., Hartley, D. J., Hausladen, P., Hwang, J. K., and Krolas, W.
- Abstract
Neutron-rich radioactive ion beams available from the HRIBF allow a variety of measurements around the 132Sn region, including Coulomb excitation and single-nucleon transfer. The B(E2; 0+ → 2+) values for first 2+ excited states of even-even neutron-rich 132-136Te and {au126-130}Sn have been measured by Coulomb excitation in inverse kinematics. Neutron transfer onto a 134Te beam from 9Be and 13C targets, to populate single-particle states in 135Te, has also been studied. Gamma rays from the 13C(134Te, 12C) reaction were used to identify the vi13/2 state in 135Te, at an energy of 2109 keV. These and other results, and plans for future experiments with these neutron-rich beams, are presented. [ABSTRACT FROM AUTHOR]
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- 2005
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9. Single-neutron excitations in neutron-rich N = 51 nuclei.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Thomas, J. S., Bardayan, D. W., Blackmon, J. C., Cizewski, J. A., Fitzgerald, R. P., Greife, U., Gross, C. J., Johnson, M. S., Jones, K. L., Kozub, R. L., Liang, J. F., Livesay, R. J., Ma, Z., Moazen, B. H., Nesaraja, C. D., Shapira, D., and Smith, M. S.
- Abstract
Single-neutron transfer reactions have been measured on two N = 50 isotones at the Holifield Radioactive Ion Beam Facility (HRIBF). The single-particle-like states of 83Ge and 85Se have been populated using radioactive ion beams of 82Ge and 84Se and the (d, p) reaction in inverse kinematics. The properties of the lowest-lying states —including excitation energies, orbital angular momenta, and spectroscopic factors— have been determined for these N = 51 nuclei. [ABSTRACT FROM AUTHOR]
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- 2005
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10. First nuclear moment measurement with radioactive beams by recoil-in-vacuum method: g-factor of the 21+ state in 132Te.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Stone, N. J., Stuchbery, A. E., Danchev, M., Pavan, J., Timlin, C. L., Baktash, C., Barton, C., Beene, J. R., Benczer-Koller, N., Bingham, C. R., Dupak, J., Galindo-Uribarri, A., Gross, C. J., Kumbartzki, G., Radford, D. C., Stone, J. R., and Zamfir, N. V.
- Abstract
Following Coulomb excitation of the radioactive ion beam (RIB) 132Te at HRIBF, we report the first use of the recoil-in-vacuum (RIV) method to determine the g-factor of the 21+ state to be (+)0:35(5). The advantages offered by the RIV method in the context of RIBs and modern detector arrays are discussed. [ABSTRACT FROM AUTHOR]
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- 2005
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11. Single-Particle Structure of Neutron-Rich Nuclei.
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Cizewski, J. A., Thomas, K. L.Jones J.S., Bardayan, D. W., Blackmon, J. C., Gross, C. J., Liang, J. F., Shapira, D., Smith, M. S., Stracener, D. W., Kozub, R. L., Nesaraja, C. D., Greife, U., Livesay, R. J., and Ma, Z.
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MATHEMATICS ,KINEMATICS ,RADIOACTIVE nuclear beams ,PHYSICS - Abstract
The d(82Ge,p) reaction has been measured in inverse kinematics at the Holifield Radioactive Ion Beam facility, enabling a study of the evolution of single-particle structure above the N=50 shell gap for neutron-rich nuclei. © 2004 American Institute of Physics [ABSTRACT FROM AUTHOR]
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- 2004
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12. Study of the N = 77 odd-Z isotones near the proton-drip line.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Tantawy, M. N., Bingham, C. R., Mazzocchi, C., Grzywacz, R., Królas, W., Rykaczewski, K. P., Batchelder, J. C., Gross, C. J., Fong, D., Hamilton, J. H., Hartley, D. J., Hwang, J. K., Larochelle, Y., Piechaczek, A., Ramayya, A. V., Shapira, D., and Winger, J. A.
- Abstract
The evolution of the πh11/2vh11/2 and πh11/2vs1/2 isomeric configurations was studied for the N = 77 isotones near the proton drip line. The decays of metastable levels in 140Eu, 142Tb, and 144Ho were measured by means of X-, gamma- and conversion electron spectroscopy at the Recoil Mass Spectrometer at Oak Ridge. The sequence of isomeric levels in 140Eu was experimentally determined. The half-life of the πh11/2vh11/2 state in 142Tb was remeasured to be 25(1) µs. The spins and parities of 5− and 8+ for the πh11/2vs1/2 and πh11/2vh11/2142Tb isomers, respectively, were established from measured multipolarities. No evidence for the expected 1+ ground state was found in the 144Ho decay data. [ABSTRACT FROM AUTHOR]
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- 2005
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13. Discovery of the new proton emitter 144Tm.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Grzywacz, R., Karny, M., Rykaczewski, K. P., Batchelder, J. C., Bingham, C. R., Fong, D., Gross, C. J., Krolas, W., Mazzocchi, C., Piechaczek, A., Tantawy, M. N., Winger, J. A., and Zganjar, E. F.
- Abstract
Evidence for the proton decay of 144Tm was found in an experiment at the Recoil Mass Spectrometer at Oak Ridge National Laboratory. The 144Tm events were found in the weak p5n channel of the fusion reaction using a 58Ni beam at 340 MeV on a 92Mo target. The observed proton decay energies are 1.70 MeV and 1.43 MeV and the half-life ∼ 1.9 µs. The decay properties suggest proton emission from the dominant πh11/2 part of the wave function and from the small πf7/2 admixture coupled to a quadrupole vibration. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
14. Coulomb excitation of odd-A neutron-rich radioactive beams.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Yu, C. -H., Baktash, C., Batchelder, J. C., Beene, J. R., Bingham, C., Danchev, M., Galindo-Uribarri, A., Gross, C. J., Hausladen, P. A., Krolas, W., Liang, J. F., Padilla, E., Pavan, J., and Radford, D. C.
- Abstract
A test experiment was carried out at the Holifield Radioactive Beam Facility to extend Coulomb excitation studies of heavy neutron-rich radioactive isotopes from even-even to odd-A nuclei. The experiment identified 10 and 4 gamma rays in 129Te and 129Sb, respectively. The B(E2) value of one transition in 129Sb was tentatively established. More B(E2) values in 129Te and 129Sb will be extracted upon completion of the data analysis. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
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15. 132Te and single-particle density-dependent pairing.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Zamfir, N. V., Hughes, R. O., Casten, R. F., Radford, D. C., Barton, C. J., Baktash, C., Caprio, M. A., Galindo-Uribarri, A., Gross, C. J., Hausladen, P. A., McCutchan, E. A., Ressler, J. J., Shapira, D., Stracener, D. W., and Yu, C. -H.
- Abstract
132Te has been studied through β- decay of 132Sb radioactive beam at HRIBF leading to a significantly revised level scheme. A number of newly identified, likely 2+ states allows for a test of recent quasiparticle random phase approximation calculations with a density-dependent pairing force. In addition, the removal of a previously proposed 3− state allows for a simple shell model interpretation of the low-lying negative-parity states. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
16. Measurement of evaporation residue cross sections from reactions with radioactive neutron-rich beams.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Shapira, D., Liang, J. F., Gross, C. J., Varner, R. L., Beene, J. R., Galindo-Uribarri, A., Gomez Del Campo, J., Mueller, P. E., Stracener, D. W., Hausladen, P. A., Harlin, C., Kolata, J. J., Amro, H., Loveland, W., Jones, K. L., Bierman, J. D., and Caraley, A. L.
- Abstract
Evaporation residue cross sections for 132Sn, 134Te and 124Sn with 64Ni were measured. A compact system to measure these cross sections to values as low as 1 mb is described and a sample of data acquired with this system is shown. [ABSTRACT FROM AUTHOR]
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- 2005
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17. Sub-barrier fusion induced by neutron-rich radioactive 132Sn.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Liang, J. F., Shapira, D., Gross, C. J., Varner, R. L., Amro, H., Beene, J. R., Bierman, J. D., Caraley, A. L., Galindo-Uribarri, A., Gomez del Campo, J., Hausladen, P. A., Jones, K. L., Kolata, J. J., Larochelle, Y., Loveland, W., Mueller, P. E., and Peterson, D.
- Abstract
Evaporation residue cross-sections measured with short-lived 132Sn on 64Ni at energies near and below the Coulomb barrier were found to be enhanced as compared to those measured with stable Sn isotopes on 64Ni. Subsequent measurements of fission following fusion of 132Sn with 64Ni and extending the measurement of evaporation residues to higher energies were carried out. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
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18. Study of fine structure in the proton radioactivity of 146Tm.
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Batchelder, J. C., Tantawy, M., Bingham, C. R., Danchev, M., Fong, D. J., Ginter, T. N., Gross, C. J., Grzywacz, R., Hagino, K., Hamilton, J. H., Karny, M., Krolas, W., Mazzocchi, C., Piechaczek, A., Ramayya, A. V., Rykaczewski, K. P., and Stolz, A.
- Abstract
Measurement of fine structure in proton emission allows one to deduce the composition of the parent and daughter state's wavefunction populated by proton emission. This paper presents new experimental data on the fine-structure decay of 146Tm, and a new interpretation of its decay properties. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
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19. A novel way of doing decay spectroscopy at a radioactive ion beam facility.
- Author
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Gross, Carl J., Nazarewicz, Witold, Rykaczewski, Krzysztof P., Gross, C. J., Rykaczewski, K. P., Shapira, D., Winger, J. A., Batchelder, J. C., Bingham, C. R., Grzywacz, R. K., Hausladen, P. A., Krolas, W., Mazzocchi, C., Piechaczek, A., and Zganjar, E. F.
- Abstract
A technique to enhance the purity of accelerated radioactive ion beams for decay studies is presented. The technique requires a 3MeV=nucleon beam and a transmission ionization chamber. The gas pressure in the multi-anode ionization chamber is adjusted so that high-Z components of the beam are ranged out in the gas transmitting the more exotic, low-Z components to the measuring station. Initial tests with a radioactive 120Ag and 120In mixed beam indicate at least a factor of 5 relative enhancement of the 120Ag decay transitions. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
20. A novel way of doing decay spectroscopy at a radioactive ion beam facility.
- Author
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Gross, C. J., Rykaczewski, K. P., Shapira, D., Winger, J. A., Batchelder, J. C., Bingham, C. R., Grzywacz, R. K., Hausladen, P. A., Krolas, W., Mazzocchi, C., Piechaczek, A., and Zganjar, E. F.
- Subjects
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ION bombardment , *BETA decay , *SPECTRUM analysis , *NUCLEAR physics , *PHYSICS - Abstract
A technique to enhance the purity of accelerated radioactive ion beams for decay studies is presented. The technique requires a 3MeV/nucleon beam and a transmission ionization chamber. The gas pressure in the multi-anode ionization chamber is adjusted so that high- Z components of the beam are ranged out in the gas transmitting the more exotic, low- Z components to the measuring station. Initial tests with a radioactive 120Ag and 120In mixed beam indicate at least a factor of 5 relative enhancement of the 120Ag decay transitions. [ABSTRACT FROM AUTHOR]
- Published
- 2005
- Full Text
- View/download PDF
21. Study of fine structure in the proton radioactivity of 146Tm.
- Author
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Batchelder, J. C., Tantawy, M., Bingham, C. R., Danchev, M., Fong, D. J., Ginter, T. N., Gross, C. J., Grzywacz, R., Hagino, K., Hamilton, J. H., Karny, M., Krolas, W., Mazzocchi, C., Piechaczek, A., Ramayya, A. V., Rykaczewski, K. P., Stolz, A., Winger, J. A., Yu, C.-H., and Zganjar, E. F.
- Subjects
PROTONS ,PARTICLES (Nuclear physics) ,RADIOACTIVITY ,NUCLEAR physics ,PHYSICS - Abstract
Measurement of fine structure in proton emission allows one to deduce the composition of the parent and daughter state’s wavefunction populated by proton emission. This paper presents new experimental data on the fine-structure decay of
146 Tm, and a new interpretation of its decay properties. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
22. 132Te and single-particle density-dependent pairing.
- Author
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Zamfir, N. V., Hughes, R. O., Casten, R. F., Radford, D. C., Barton, C. J., Baktash, C., Caprio, M. A., Galindo-Uribarri, A., Gross, C. J., Hausladen, P. A., McCutchan, E. A., Ressler, J. J., Shapira, D., Stracener, D. W., and Yu, C.-H.
- Subjects
RADIOACTIVITY ,PARTICLES (Nuclear physics) ,BETA decay ,NEUTRONS ,PHYSICS - Abstract
132 Te has been studied through β- decay of132 Sb radioactive beam at HRIBF leading to a significantly revised level scheme. A number of newly identified, likely 2+ states allows for a test of recent quasiparticle random phase approximation calculations with a density-dependent pairing force. In addition, the removal of a previously proposed 3- state allows for a simple shell model interpretation of the low-lying negative-parity states. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
23. Coulomb excitation of odd- A neutron-rich radioactive beams.
- Author
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Yu, C.-H., Baktash, C., Batchelder, J. C., Beene, J. R., Bingham, C., Danchev, M., Galindo-Uribarri, A., Gross, C. J., Hausladen, P. A., Krolas, W., Liang, J. F., Padilla, E., Pavan, J., and Radford, D. C.
- Subjects
RADIOACTIVITY ,COULOMB excitation ,GAMMA rays ,NUCLEAR physics ,PHYSICS - Abstract
A test experiment was carried out at the Holifield Radioactive Beam Facility to extend Coulomb excitation studies of heavy neutron-rich radioactive isotopes from even-even to odd- A nuclei. The experiment identified 10 and 4 gamma rays in
129 Te and129 Sb, respectively. The B( E2) value of one transition in129 Sb was tentatively established. More B( E2) values in129 Te and129 Sb will be extracted upon completion of the data analysis. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
24. Sub-barrier fusion induced by neutron-rich radioactive 132Sn.
- Author
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Liang, J. F., Shapira, D., Gross, C. J., Varner, R. L., Amro, H., Beene, J. R., Bierman, J. D., Caraley, A. L., Galindo-Uribarri, A., Gomez del Campo, J., Hausladen, P. A., Jones, K. L., Kolata, J. J., Larochelle, Y., Loveland, W., Mueller, P. E., Peterson, D., Radford, D. C., and Stracener, D. W.
- Subjects
COULOMB excitation ,ISOTOPES ,NUCLEAR fission ,NEUTRONS ,NUCLEAR physics ,PHYSICS - Abstract
Evaporation residue cross-sections measured with short-lived
132 Sn on64 Ni at energies near and below the Coulomb barrier were found to be enhanced as compared to those measured with stable Sn isotopes on64 Ni. Subsequent measurements of fission following fusion of132 Sn with64 Ni and extending the measurement of evaporation residues to higher energies were carried out. [ABSTRACT FROM AUTHOR]- Published
- 2005
- Full Text
- View/download PDF
25. Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am
- Author
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Carl J Gross, Julia Even, J. Krier, Witold Nazarewicz, T. Torres, Alexander Yakushev, K. P. Rykaczewski, I. Kojouharov, Matthias Schädel, Dirk Rudolph, Birgit Kindler, Ch. E. Düllmann, N. Kurz, Daniel Cox, F. P. Heßberger, Egon Jäger, Ingemar Ragnarsson, Klaus Eberhardt, Michael Block, J. P. Omtvedt, C. Mokry, Dieter Ackermann, Jacek Dobaczewski, Petra Thörle-Pospiech, H. Schaffner, A. Ward, Sven Åberg, J. V. Kratz, Daniel Ward, A. K. Mistry, Andreas Türler, Philippos Papadakis, Heino Nitsche, Kenneth E. Gregorich, Norbert Wiehl, Claes Fahlander, U. Forsberg, X. Derkx, Jadambaa Khuyagbaatar, H. Brand, Bettina Lommel, J. Gerl, A. Di Nitto, Yue Shi, Jörg Runke, B. G. Carlsson, J. M. Gates, L.-L. Andersson, B. Schausten, Luis Sarmiento, Norbert Trautmann, R.-D. Herzberg, Pavel Golubev, T. Traut, Forsberg, U., Rudolph, D., Andersson, L. -L., Di Nitto, A., Dullmann, C. E., Fahlander, C., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schadel, M., Yakushev, A., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Y., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N.
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Nuclear and High Energy Physics ,alpha decay ,Fission ,Superheavy elements ,chemistry.chemical_element ,Superheavy Elements ,nucl-ex ,Atomic ,01 natural sciences ,7. Clean energy ,Nuclear physics ,Particle and Plasma Physics ,Recoil ,0103 physical sciences ,Nuclear ,Element 115 ,α decay ,Nuclear Experiment ,010306 general physics ,Ununpentium ,Spontaneous fission ,Physics ,Quantum Physics ,Uup ,010308 nuclear & particles physics ,Molecular ,Nuclear & Particles Physics ,Superheavy element ,chemistry ,Decay chain ,Alpha decay ,Astronomical and Space Sciences ,Excitation - Abstract
Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.
- Published
- 2016
26. Evading direct dark matter detection in Higgs portal models
- Author
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Christian Gross, Takashi Toma, Stefan Pokorski, Giorgio Arcadi, Oleg Lebedev, Arcadi, G., Gross, C., Lebedev, O., Pokorski, S., Toma, T., Department of Physics, and Helsinki Institute of Physics
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,010308 nuclear & particles physics ,Hot dark matter ,High Energy Physics::Phenomenology ,Scalar field dark matter ,FOS: Physical sciences ,01 natural sciences ,114 Physical sciences ,dark matter ,lcsh:QC1-999 ,Hidden sector ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Weakly interacting massive particles ,0103 physical sciences ,Mixed dark matter ,Warm dark matter ,010306 general physics ,Light dark matter ,Dark fluid ,lcsh:Physics - Abstract
Many models of Higgs portal Dark Matter (DM) find themselves under pressure from increasingly tight direct detection constraints. In the framework of gauge field DM, we study how such bounds can be relaxed while retaining the thermal WIMP paradigm. When the hidden sector gauge symmetry is broken via the Higgs mechanism, the hidden sector generally contains unstable states which are lighter than dark matter. These states provide DM with an efficient annihilation channel. As a result, the DM relic abundance and the direct detection limits are controlled by different parameters, and the two can easily be reconciled. This simple setup realizes the idea of `secluded' dark matter naturally., Comment: 9 pages
- Published
- 2017
27. Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains
- Author
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Dieter Ackermann, Petra Thörle-Pospiech, H. Schaffner, Julia Even, Jon Petter Omtvedt, Ch. E. Düllmann, T. Traut, Alexander Yakushev, Philippos Papadakis, I. Kojouharov, Claes Fahlander, Klaus Eberhardt, J.M. Gates, K. Rykaczewski, Pavel Golubev, F. P. Heßberger, Sven Åberg, J. Krier, J. V. Kratz, J. Gerl, A. K. Mistry, Andreas Türler, Michael Block, R-D Herzberg, C. J. Gross, T. Torres, Egon Jäger, Matthias Schädel, B. Schausten, X. Derkx, K.E. Gregorich, Birgit Kindler, Norbert Wiehl, Luis Sarmiento, J. Runke, Ingemar Ragnarsson, A. Di Nitto, H. Brand, Daniel Cox, B. G. Carlsson, Norbert Trautmann, A. Ward, Daniel Ward, Jadambaa Khuyagbaatar, C. Mokry, Heino Nitsche, U. Forsberg, Nikolaus Kurz, L.-L. Andersson, Dirk Rudolph, Bettina Lommel, Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessbberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schadel, M., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, D. E., and Wiehl, N.
- Subjects
Physics ,element 115 ,Photon ,Isotope ,alpha decay ,General Physics and Astronomy ,7. Clean energy ,Nuclear & Particles Physics ,Coincidence ,Charged particle ,Mathematical Sciences ,Nuclear physics ,superheavy elements ,gamma-ray spectroscopy ,Subatomic Physics ,Physical Sciences ,Gamma spectroscopy ,ddc:530 ,Alpha decay ,Decay chain ,Atomic physics ,Spectroscopy - Abstract
Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum fur Schwerionenforschung, Darmstadt, Germany. The decay chains are basically consistent with previous findings and are considered to originate from isotopes of element 115 with mass numbers 287, 288, and 289. A set-up aiming specifically for high-resolution charged particle and photon coincidence spectroscopy was placed behind the gas-filled separator TASCA. For the first time, γ rays as well as X-ray candidates were observed in prompt coincidence with the α-decay chains of element 115.
- Published
- 2014
28. Spectroscopy of Element 115 Decay Chains
- Author
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Sven Åberg, A. K. Mistry, I. Kojouharov, Bettina Lommel, Birgit Kindler, A. Ward, T. Traut, Alexander Yakushev, Klaus Eberhardt, Norbert Wiehl, K. P. Rykaczewski, Dirk Rudolph, Claes Fahlander, Michael Block, Daniel Cox, Andreas Türler, Heino Nitsche, C. J. Gross, L.-L. Andersson, R-D Herzberg, Jon Petter Omtvedt, J. Runke, Dieter Ackermann, J. V. Kratz, Daniel Ward, Petra Thörle-Pospiech, J. Krier, Nikolaus Kurz, H. Schaffner, T. Torres, K. E. Gregorich, J. M. Gates, H. Brand, Norbert Trautmann, Matthias Schädel, Ingemar Ragnarsson, B. G. Carlsson, Ch. E. Düllmann, Philippos Papadakis, F. P. Heßberger, C. Mokry, Pavel Golubev, Julia Even, U. Forsberg, B. Schausten, Luis Sarmiento, Egon Jäger, X. Derkx, J. Gerl, A. Di Nitto, Jadambaa Khuyagbaatar, Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L. -L., Di Nitto, A., Dullmann, C. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Hessberger, F. P., Herzberg, R. -D., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schadel, M., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N.
- Subjects
Physics ,Isotope ,010308 nuclear & particles physics ,Nuclear structure ,General Physics and Astronomy ,01 natural sciences ,Coincidence ,540 Chemistry ,0103 physical sciences ,Physical Sciences ,Subatomic Physics ,ddc:550 ,570 Life sciences ,biology ,Alpha decay ,Decay chain ,Atomic physics ,Element (category theory) ,010306 general physics ,Spectroscopy ,Excitation - Abstract
A high-resolution , X-ray and gamma-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated alpha-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z = 115. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z > 112. Comprehensive Monte-Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.
- Published
- 2013
29. Spectroscopic Tools Applied to Element Z = 115 Decay Chains
- Author
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U. Forsberg, D. Rudolph, P. Golubev, L.G. Sarmiento, A. Yakushev, L.-L. Andersson, A. Di Nitto, Ch.E. Düllmann, J.M. Gates, K.E. Gregorich, C.J. Gross, F.P. Heßberger, R.-D. Herzberg, J. Khuyagbaatar, J.V. Kratz, K. Rykaczewski, M. Schädel, S. Åberg, D. Ackermann, M. Block, H. Brand, B.G. Carlsson, D. Cox, X. Derkx, K. Eberhardt, J. Even, C. Fahlander, J. Gerl, E. Jäger, B. Kindler, J. Krier, I. Kojouharov, N. Kurz, B. Lommel, A. Mistry, C. Mokry, H. Nitsche, J.P. Omtvedt, P. Papadakis, I. Ragnarsson, J. Runke, H. Schaffner, B. Schausten, P. Thörle-Pospiech, T. Torres, T. Traut, N. Trautmann, A. Türler, A. Ward, D.E. Ward, and N. Wiehl, Lunardi, S., Bizzeti, P.G., Bucci, C., Chiari, M., Dainese, A., Di Nezza, P., Menegazzo, R., Nannini, A., Signorini, C., Valiente-Dobon, J.J., Forsberg, U., Rudolph, D., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Hessberger, F. P., Herzberg, R. -D., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schadel, M., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jager, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N.
- Subjects
Physics ,Isotope ,Silicon ,Physics::Instrumentation and Detectors ,QC1-999 ,Detector ,Separator (oil production) ,Mechanical engineering ,chemistry.chemical_element ,7. Clean energy ,Nuclear physics ,chemistry ,Physical Sciences ,Subatomic Physics ,ddc:530 ,Decay chain ,Nuclide ,Nuclear Experiment ,Line (formation) - Abstract
Nuclides that are considered to be isotopes of element Z = 115 were produced in the reaction 48Ca + 243Am at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt. The detector setup TASISpec was used. It was mounted behind the gas-filled separator TASCA. Thirty correlated α-decay chains were found, and the energies of the particles were determined with high precision. Two important spectroscopic aspects of the offline data analysis are discussed in detail: the handling of digitized preamplified signals from the silicon strip detectors, and the energy reconstruction of particles escaping to upstream detectors relying on pixel-by-pixel dead-layer thicknesses.
- Published
- 2014
30. Multicomponent Dark Matter from gauge symmetry
- Author
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Giorgio Arcadi, Oleg Lebedev, Stefan Pokorski, Yann Mambrini, Christian Gross, Takashi Toma, Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, Helsinki Institute of Physics, Laboratoire de Physique Théorique d'Orsay [Orsay] ( LPT ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), Arcadi, G., Gross, C., Lebedev, O., Mambrini, Y., Pokorski, S., and Toma, T.
- Subjects
Z(2) x Z(2) ,Particle physics ,Nuclear and High Energy Physics ,WIMP ,education ,Dark matter ,Scalar (mathematics) ,FOS: Physical sciences ,114 Physical sciences ,01 natural sciences ,dark matter ,Standard Model ,High Energy Physics - Phenomenology (hep-ph) ,SU(3) ,0103 physical sciences ,010306 general physics ,Gauge symmetry ,Physics ,010308 nuclear & particles physics ,symmetry: gauge ,spontaneous symmetry breaking ,Cosmology of Theories beyond the SM ,sensitivity ,hidden sector ,Symmetry (physics) ,field theory: scalar ,Hidden sector ,High Energy Physics - Phenomenology ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Beyond Standard Model ,Higgs boson ,[ PHYS.HPHE ] Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,direct detection ,Scalar field - Abstract
The composition of Dark Matter (DM) remains an important open question. The current data do not distinguish between single- and multi-component DM, while in theory constructions it is often assumed that DM is composed of a single field. In this work, we study a hidden sector which naturally entails multicomponent DM consisting of spin-1 and spin-0 states. This UV complete set-up is based on SU(3) hidden gauge symmetry with the minimal scalar field content to break it spontaneously. The presence of multiple DM components is a result of a residual Z_2 x Z'_2 symmetry which is part of an unbroken global U(1) x Z'_2 inherent in the Yang-Mills systems. We find that the model exhibits various parametric regimes with drastically different DM detection prospects. In particular, we find that the direct detection cross section is much suppressed in large regions of parameter space as long as the Standard Model Higgs mixes predominantly with a single scalar from the hidden sector. The resulting scattering rate is often beyond the level of sensitivity of XENON1T, while still being consistent with the thermal WIMP paradigm., v2: 25 pages, added references, small text adjustments
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