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14 results on '"Schaffner H"'

1. Spectroscopy along Flerovium Decay Chains: Discovery of Ds280 and an Excited State in Cn282

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, Eberth, J, Fahlander, C, Forsberg, U, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Hrabar, Y, Jäger, E, Judson, D, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Ljungberg, J, Lommel, B, Louko, J, Meyer, C-C, Mistry, A, Mokry, C, Papadakis, P, Parr, E, Pore, JL, Ragnarsson, I, Runke, J, Schädel, M, Schaffner, H, Schausten, B, Shaughnessy, DA, Thörle-Pospiech, P, Trautmann, N, and Uusitalo, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

2. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn.

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, Eberth, J, Fahlander, C, Forsberg, U, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Hrabar, Y, Jäger, E, Judson, D, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Ljungberg, J, Lommel, B, Louko, J, Meyer, C-C, Mistry, A, Mokry, C, Papadakis, P, Parr, E, Pore, JL, Ragnarsson, I, Runke, J, Schädel, M, Schaffner, H, Schausten, B, Shaughnessy, DA, Thörle-Pospiech, P, Trautmann, N, and Uusitalo, J

Subjects
General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

3. Spectroscopic Tools Applied to Flerovium Decay Chains

Author

Cox, DM, Såmark-Roth, A, Rudolph, D, Sarmiento, LG, Fahlander, C, Forsberg, U, Golubev, P, Heery, JAM, Yakushev, A, Albers, HM, Block, M, Brand, H, Clark, RM, Düllmann, Ch E, Eberth, J, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Jäger, E, Kindler, B, Khuyagbaatar, J, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Lommel, B, Mistry, A, Meyer, C-C, Mokry, C, Papadakis, P, Pore, JL, Runke, J, Thörle-Pospiech, P, Trautmann, N, Schaffner, H, Schausten, B, and Uusitalo, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Condensed Matter Physics, Other Physical Sciences, Physical sciences
Abstract

An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The detector upgrades along with development of new analytical techniques have improved the sensitivity of the TASISpec setup for measuring α-photon coincidences. These improvements have been assessed with test reactions. The reaction 48Ca+206,207Pb was used for verification of experimental parameters such as transmission to implantation DSSD and target-segment to α-decay correlations. The reaction 48Ca+ nat Hf was used to produce several short-lived nuclei with multiple-α decay chains to investigate pile-up event deconvolution.

Published
2020

4. Recoil-α-fission and recoil-α–α-fission events observed in the reaction 48Ca + 243Am

Author

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

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Superheavy elements, Element 115, Uup, alpha decay, Spontaneous fission, nucl-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Nuclear and plasma physics, Particle and high energy physics
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

5. Alpha-photon coincidence spectroscopy along element 115 decay chains

Author

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

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Abstract

Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum für 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

6. First experiment at TASCA towards X-ray fingerprinting of element 115 decay chains

Author

Forsberg, U, Golubev, P, Sarmiento, LG, Jeppsson, J, Rudolph, D, Andersson, LL, Ackermann, D, Asai, M, Block, M, Eberhardt, K, Even, J, Düllmann, CE, Dvorak, J, Gates, JM, Gregorich, KE, Herzberg, RD, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lahiri, S, Lommel, B, Maiti, M, Merchán, E, Omtvedt, JP, Parr, E, Runke, J, Schaffner, H, Schädel, M, and Yakushev, A

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Abstract

To identify the atomic number of superheavy nuclei produced in 48Ca-induced fusion-evaporation reactions, an experiment aiming at measuring characteristic X-rays is being prepared at GSI, Darmstadt, Germany. The gas-filled separator TASCA will be employed, sending the residues towards the multi-coincidence detector setup TASISpec. Two ionoptical modes relying on differing magnetic polarities of the quadrupole magnets can be used at TASCA. New simulations and experimental tests of transmission and background suppression for these two focusing modes into TASISpec are presented.

Published
2012

7. Decay studies in the A similar to 225 Po-Fr region from the DESPEC campaign at GSI in 2021

Author

Polettini, M, Pellumaj, J, Benzoni, G, Zhang, G, Mengoni, D, Vidal, RM Perez, Genna, D, Bracco, A, Aggez, G, Al Aqueel, M, Alayed, B, Albers, HM, Algora, A, Alhomaidhi, S, Appleton, C, Arici, T, Armstrong, M, Arnswald, K, Balogh, M, Banerjee, A, Blazhev, A, Bottoni, S, Boutachkov, P, Bruce, A, Bruno, C, Camera, F, Cederwall, B, Chishti, MMR, Cox, DM, Crespi, FCL, Das, B, Davinson, T, De Angelis, G, Dickel, T, Doncel, M, Donthi, R, Ertoprak, A, Escudeiro, R, Esmaylzadeh, A, Fraile, LM, Gaffney, L, Gamba, ER, Gerl, J, Gottardo, A, Ha, J, Haettner, E, Hall, O, Heggen, H, Hrabar, Y, Hubbard, N, Jazrawi, S, John, PR, Jolie, J, Jones, C, Joss, D, Judson, D, Kahl, D, Karayonchev, V, Kazantseva, E, Kern, R, Knafla, L, Kojouharov, I, Korgul, A, Korten, W, Koseoglou, P, Kosir, G, Kostyleva, D, Kurtukian-Nieto, T, Kurz, N, Kuzminchuk, N, Labiche, M, Lenzi, S, Leoni, S, Lozeva, R, Mertzimekis, TJ, Mikolajczuk, M, Million, B, Mistry, AK, Morales, A, Mukha, I, Murias, JR, Napoli, D, NaraSingh, BS, O'Donnell, D, Orrigo, SEA, Page, R, Pelonis, S, Petrovic, J, Pietralla, N, Pietri, S, Pigliapoco, S, Podolyak, Zs, Porzio, C, Quintana Arnes, B, Recchia, F, Regan, PH, Reiter, P, Rezynkina, K, Roy, P, Rudigier, M, Ruotsalainen, P, Sahin, E, Sarmiento, LG, Satrazani, M-M, Schaffner, H, Scheidenberger, C, Sexton, L, Sharma, A, Smallcombe, J, Sood, A, Vasileiou, P, Vesic, J, Vilhena, J, Waring, L, Weick, H, Werner, V, Wiederhold, J, Wieland, O, Wimmer, K, Wollersheim, HJ, Woods, P, Yaneva, A, Zanon, I, Zhao, J, Zidarova, R, Ziliani, S, Zimba, G, and Zyriliou, A

Subjects
Science & Technology, Physics, Physical Sciences, Physics, Multidisciplinary
Abstract

ispartof: NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS vol:45 issue:5 status: published

Published
2022

8. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
General Physics, Engineering, Superheavy elements, Subatomic Physics, Island of stability, Physical Sciences, Mean field theory, Alpha decay, ddc:530, Mathematical Sciences, Nuclear spectroscopy
Abstract

Physical review letters 126(3), 032503 (2021). doi:10.1103/PhysRevLett.126.032503, Published by APS, College Park, Md.

Published
2021

9. Proton Shell Evolution below Sn-132: First Measurement of Low-Lying beta-Emitting Isomers in Ag-123,Ag-325

Author

Chen, ZQ, Li, ZH, Hua, H, Watanabe, H, Yuan, CX, Zhang, SQ, Lorusso, G, Nishimura, S, Baba, H, Browne, F, Benzoni, G, Chae, KY, Crespi, FCL, Doornenbal, P, Fukuda, N, Gey, G, Gernhaeuser, R, Inabe, N, Isobe, T, Jiang, DX, Jungclaus, A, Jung, HS, Jin, Y, Kameda, D, Kim, GD, Kim, YK, Kojouharov, I, Kondev, FG, Kubo, T, Kurz, N, Kwon, YK, Li, XQ, Lou, JL, Lane, GJ, Li, CG, Luo, DW, Montaner-Piza, A, Moschner, K, Niu, CY, Naqvi, F, Niikura, M, Nishibata, H, Odahara, A, Orlandi, R, Patel, Z, Podolyak, Zs, Sumikama, T, Soderstrom, P-A, Sakurai, H, Schaffner, H, Simpson, GS, Steiger, K, Suzuki, H, Taprogge, J, Takeda, H, Vajta, Zs, Wang, HK, Wu, J, Wendt, A, Wang, CG, Wu, HY, Wang, X, Wu, CG, Xu, C, Xu, ZY, Yagi, A, Ye, YL, and Yoshinaga, K

Subjects
RIKEN, Science & Technology, IMPACT, Physics, Physical Sciences, Physics, Multidisciplinary, ISOTOPES, DECAY
Abstract

The β-delayed γ-ray spectroscopy of neutron-rich ^{123,125}Ag isotopes is investigated at the Radioactive Isotope Beam Factory of RIKEN, and the long-predicted 1/2^{-} β-emitting isomers in ^{123,125}Ag are identified for the first time. With the new experimental results, the systematic trend of energy spacing between the lowest 9/2^{+} and 1/2^{-} levels is extended in Ag isotopes up to N=78, providing a clear signal for the reduction of the Z=40 subshell gap in Ag towards N=82. Shell-model calculations with the state-of-the-art V_{MU} plus M3Y spin-orbit interaction give a satisfactory description of the low-lying states in ^{123,125}Ag. The tensor force is found to play a crucial role in the evolution of the size of the Z=40 subshell gap. The observed inversion of the single-particle levels around ^{123}Ag can be well interpreted in terms of the monopole shift of the π1g_{9/2} orbitals mainly caused by the increasing occupation of ν1h_{11/2} orbitals. ispartof: PHYSICAL REVIEW LETTERS vol:122 issue:21 ispartof: location:United States status: published

Published
2019

10. 16+ Spin-Gap Isomer in 96Cd

Author

Singh, B. S. Nara, Liu, Z., Wadsworth, R., Grawe, H., Brock, T. S., Boutachkov, P., Braun, N., Blazhev, A., Gorska, M., Pietri, S., Rudolph, D., Domingo-Pardo, C., Steer, S. J., Atac, A., Bettermann, L., Caceres, L., Eppinger, K., Engert, T., Faestermann, T., Farinon, F., Finke, F., Geibel, K., Gerl, J., Gernhaeuser, R., Goel, N., Gottardo, A., Grebosz, J., Hinke, C., Hoischen, R., Ilie, G., Iwasaki, H., Jolie, J., Kaskas, A., Kojouharov, I., Kruecken, R., Kurz, N., Merchan, E., Nociforo, C., Nyberg, Johan, Pfuetzner, M., Prochazka, A., Podolyak, Zs., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Schaffner, H., Söderström, Per-Anders, Warr, N., Weick, H., Wollersheim, H. -J, Woods, P. J., Nowacki, F., and Sieja, K.

Subjects
Physical Sciences, Subatomic Physics, Fysik
Abstract

A beta-decaying high-spin isomer in Cd-96, with a half-life T-1/2 = 0.29(-0.10)(+0.11) s, has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of Xe-124 on a Be-9 target. From the half-life and the observed gamma decays in the daughter nucleus, Ag-96, we conclude that the beta-decaying state is the long predicted 16(+) "spin-gap'' isomer. Shell-model calculations, using the Gross-Frenkel interaction and the pi nu(p(1/2,)g(9/2)) model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the N = Z = 50 gaps and the Gamow-Teller strength, Bd(GT) distributions have been studied via large-scale shell-model calculations using the pi nu(g, d, s) model space to compare with the experimental B(GT) value obtained from the half-life of the isomer.

Published
2011

11. High-spin isomers in (96)Ag : Excitations across the Z=38 and Z=50, N=50 closed shells

Author

Boutachkov, P., Gorska, M., Grawe, H., Blazhev, A., Braun, N., Brock, T. S., Liu, Z., Singh, B. S. Nara, Wadsworth, R., Pietri, S., Domingo-Pardo, C., Kojouharov, I., Caceres, L., Engert, T., Farinon, F., Gerl, J., Goel, N., Grbosz, J., Hoischen, Robert, Kurz, N., Nociforo, C., Prochazka, A., Schaffner, H., Steer, S. J., Weick, H., Wollersheim, H. -J., Faestermann, T., Podolyak, Zs., Rudolph, Dirk, Atac, A., Bettermann, L., Eppinger, K., Finke, F., Geibel, K., Gottardo, A., Hinke, C., Ilie, G., Iwasaki, H., Jolie, J., Kruecken, R., Merchan, E., Nyberg, J., Pfuetzner, M., Regan, P. H., Reiter, P., Rinta-Antila, S., Scholl, C., Soderstrom, P. -A., Warr, N., Woods, P. J., Nowacki, F., and Sieja, K.

Subjects
Subatomic Physics, Physical Sciences, Fysik
Abstract

Excited states in (96)Ag were populated in fragmentation of an 850-MeV/u (124)Xe beam on a 4-g/cm(2) Be target. Three new high-spin isomers were identified and the structure of the populated states was investigated. The level scheme of (96)Ag was established, and a spin parity of (13(-)), (15(+)), and (19(+)) was assigned to the new isomeric states. Shell-model calculations were performed in various model spaces, including pi nu(p(1/2), g(9/2), f(5/2), p(3/2)) and the large-scale shell-model space pi nu(gds), to account for the observed parity changing M2 and E3 transitions from the (13(-)) isomer and the E2 and E4 transitions from the (19(+)) core-excited isomer, respectively. The calculated level schemes and reduced transition strengths are found to be in very good agreement with the experiment.

Published
2011

12. Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

Author

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

13. Spectroscopy of Element 115 Decay Chains

Author

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

14. Spectroscopic Tools Applied to Element Z = 115 Decay Chains

Author

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

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