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1. The decay of the 21.47-MeV stretched resonance in 13C: A precise probe of the open nuclear quantum system description

Author

N. Cieplicka-Oryńczak, Y. Jaganathen, B. Fornal, S. Leoni, M. Płoszajczak, M. Ciemała, S. Ziliani, M. Kmiecik, A. Maj, J. Łukasik, P. Pawłowski, B. Sowicki, B. Wasilewska, M. Ziębliński, P. Bednarczyk, C. Boiano, S. Bottoni, A. Bracco, S. Brambilla, I. Burducea, F. Camera, I. Ciepał, C. Clisu, F.C.L. Crespi, K. Dhanmeher, N. Florea, E. Gamba, J. Grębosz, M.N. Harakeh, D.A. Iancu, Ł.W. Iskra, M. Krzysiek, P. Kulessa, N. Marginean, R. Marginean, I. Matea, M. Matejska-Minda, K. Mazurek, B. Million, W. Parol, M. Sferrazza, L. Stan, and B. Włoch

Subjects
13C, Nuclear structure, Stretched resonance states, Gamow Shell Model, Physics, QC1-999
Abstract

The decay of the 21.47-MeV stretched resonance in 13C, arising from p3/2→d5/2 nucleon excitation coupled to maximum spin, was investigated in a (p,p′) experiment at 135 MeV proton bombarding energy, performed at the Cyclotron Centre Bronowice (CCB) at IFJ PAN in Krakow. First experimental information on the proton and neutron decay branches from this state was obtained by using coincidence measurement of protons inelastically scattered on a 13C target and γ rays from daughter nuclei, namely, 12B (proton decay) and 12C (neutron decay). The main branches lead to the Jπ=2+, first-excited state at 0.953 MeV in 12B, and to the Jπ=1+, T=1 level at 15.110 MeV in 12C. The results were compared with predictions from the Gamow Shell Model (GSM), which was used to describe the stretched resonance in terms of its energy, width, electromagnetic transition strengths and decay pattern. A very good agreement was obtained between the measured and calculated properties of the 21.47-MeV stretched resonance in 13C, demonstrating the high-quality and precision of the GSM wave function calculations, which include coupling to the resonant and non-resonant particle continuum.

Published
2022
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2. Oscillations above the barrier in the fusion of 28Si + 28Si

Author

G. Montagnoli, A.M. Stefanini, H. Esbensen, L. Corradi, S. Courtin, E. Fioretto, J. Grebosz, F. Haas, H.M. Jia, C.L. Jiang, M. Mazzocco, C. Michelagnoli, T. Mijatović, D. Montanari, C. Parascandolo, F. Scarlassara, E. Strano, S. Szilner, and D. Torresi

Subjects
Physics, QC1-999
Abstract

Fusion cross sections of 28Si + 28Si have been measured in a range above the barrier with a very small energy step (ΔElab=0.5 MeV). Regular oscillations have been observed, best evidenced in the first derivative of the energy-weighted excitation function. For the first time, quite different behaviors (the appearance of oscillations and the trend of sub-barrier cross sections) have been reproduced within the same theoretical frame, i.e., the coupled-channel model using the shallow M3Y + repulsion potential. The calculations suggest that channel couplings play an important role in the appearance of the oscillations, and that the simple relation between a peak in the derivative of the energy-weighted cross section and the height of a centrifugal barrier is lost, and so is the interpretation of the second derivative of the excitation function as a barrier distribution for this system, at energies above the Coulomb barrier. Keywords: Heavy-ion fusion, Sub-barrier cross sections, Coupled-channels model

Published
2015
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3. Pygmy dipole resonance in 124Sn populated by inelastic scattering of 17O

Author

L. Pellegri, A. Bracco, F.C.L. Crespi, S. Leoni, F. Camera, E.G. Lanza, M. Kmiecik, A. Maj, R. Avigo, G. Benzoni, N. Blasi, C. Boiano, S. Bottoni, S. Brambilla, S. Ceruti, A. Giaz, B. Million, A.I. Morales, R. Nicolini, V. Vandone, O. Wieland, D. Bazzacco, P. Bednarczyk, M. Bellato, B. Birkenbach, D. Bortolato, B. Cederwall, L. Charles, M. Ciemala, G. De Angelis, P. Désesquelles, J. Eberth, E. Farnea, A. Gadea, R. Gernhäuser, A. Görgen, A. Gottardo, J. Grebosz, H. Hess, R. Isocrate, J. Jolie, D. Judson, A. Jungclaus, N. Karkour, M. Krzysiek, E. Litvinova, S. Lunardi, K. Mazurek, D. Mengoni, C. Michelagnoli, R. Menegazzo, P. Molini, D.R. Napoli, A. Pullia, B. Quintana, F. Recchia, P. Reiter, M.D. Salsac, B. Siebeck, S. Siem, J. Simpson, P.-A. Söderström, O. Stezowski, Ch. Theisen, C. Ur, J.J. Valiente Dobon, and M. Zieblinski

Subjects
Physics, QC1-999
Abstract

The γ decay from the high-lying states of 124Sn was measured using the inelastic scattering of 17O at 340 MeV. The emitted γ rays were detected with high resolution with the AGATA demonstrator array and the scattered ions were detected in two segmented ΔE–E silicon telescopes. The angular distribution was measured both for the γ rays and the scattered 17O ions. An accumulation of E1 strength below the particle threshold was found and compared with previous data obtained with (γ,γ′) and (α,α′γ) reactions. The present results of elastic scattering, and excitation of E2 and E1 states were analysed using the DWBA approach. From this comprehensive description the isoscalar component of the 1− excited states was extracted. The obtained values are based on the comparison of the data with DWBA calculations including a form factor deduced using a microscopic transition density. Keywords: Low-lying electric dipole excitations, 124Sn, Isospin character

Published
2014
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4. The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

H. Grawe, K. Straub, T. Faestermann, M. Górska, C. Hinke, R. Krücken, F. Nowacki, M. Böhmer, P. Boutachkov, H. Geissel, R. Gernhäuser, A. Gottardo, J. Grȩbosz, N. Kurz, Z. Liu, L. Maier, S. Pietri, Zs. Podolyák, K. Steiger, H. Weick, H.J. Wollersheim, P.J. Woods, N. Al-Dahan, N. Alkhomashi, A. Ataç, A. Blazhev, N. Braun, I. Čeliković, T. Davinson, I. Dillmann, C. Domingo-Pardo, P. Doornenbal, G. Farrelly, F. Farinon, G. de France, J. Gerl, N. Goel, T. Habermann, R. Hoischen, R. Janik, M. Karny, A. Kaşkaş, I. Kojouharov, Th. Kröll, M. Lewitowicz, Yu.A. Litvinov, S. Myalski, F. Nebel, S. Nishimura, C. Nociforo, J. Nyberg, A. Parikh, A. Procházka, P.H. Regan, C. Rigollet, H. Schaffner, C. Scheidenberger, S. Schwertel, P.-A. Söderström, S. Steer, A. Stolz, and P. Strmeň

Subjects
Electromagnetic transitions, Shell model, Effective charges near 100Sn, Physics, QC1-999
Abstract

In a high-energy fragmentation experiment at GSI an I=π(6+) isomer and its γ-decay are identified in 102Sn, the two-neutron neighbour of the doubly-magic 100Sn. Its half-life is measured to be T=1/2367(11) ns. The possible existence of further isomers is discussed in the framework of large-scale shell model (LSSM) calculations including up to five particle-hole excitations of the 100Sn core. From the precise B(E2; 6+→4+) strength and the recently remeasured value for B(E2; 8+→6+) in the two-proton hole neighbour 98Cd effective E2 polarization charges for protons and neutrons were inferred including LSSM corrections within the full N=4 0ħω space. The results are discussed in comparison to predicted and empirically determined effective operators.

Published
2021
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5. γ decay to the ground state from the excitations above the neutron threshold in the Pb208(p,p′γ) reaction at 85 MeV

Author

B. Wasilewska, M. Kmiecik, M. Ciemała, A. Maj, F. C. L. Crespi, A. Bracco, M. N. Harakeh, P. Bednarczyk, S. Bottoni, S. Brambilla, F. Camera, I. Ciepał, N. Cieplicka-Oryńczak, M. Csatlos, B. Fornal, V. Gaudilla, J. Grȩbosz, J. Isaak, Ł. W. Iskra, M. Jeżabek, A. J. Krasznahorkay, S. Kihel, M. Krzysiek, P. Lasko, S. Leoni, M. Lewitowicz, J. Łukasik, M. Matejska-Minda, K. Mazurek, P. J. Napiorkowski, W. Parol, P. Pawłowski, L. Q. Qi, M. Saxena, Ch. Schmitt, Y. Sobolev, B. Sowicki, M. Stanoiu, A. Tamii, O. Wieland, and M. Ziȩbliński

Published
2022

6. The (6+) isomer in 102Sn revisited: Neutron and proton effective charges close to the double shell closure

Author

Shunji Nishimura, Yu. A. Litvinov, T. Davinson, H. J. Wollersheim, F. Nebel, K. Straub, T. Habermann, S. Schwertel, T. Faestermann, Igor T. Čeliković, P. Boutachkov, F. Farinon, C. Hinke, P. Strmeň, Hans Geissel, H. Schaffner, M. Karny, F. Nowacki, M. Lewitowicz, H. Grawe, N. Kurz, M. Górska, P. A. Söderström, G. F. Farrelly, Andreas Stolz, Zs. Podolyák, A. Atac, J. Grȩbosz, A. Prochazka, Robert Hoischen, I. Kojouharov, R. Janik, C. Scheidenberger, P. J. Woods, P. H. Regan, S. J. Steer, S. Pietri, S. Myalski, N. Braun, Roman Gernhäuser, M. Böhmer, A. Blazhev, N. Al-Dahan, Johan Nyberg, R. Krücken, A. Kaşkaş, J. Gerl, N. Alkhomashi, L. Maier, N. Goel, C. Nociforo, A. Gottardo, Zhi Liu, Catherine Rigollet, C. Domingo-Pardo, Helmut Weick, P. Doornenbal, Iris Dillmann, A. Parikh, K. Steiger, Th. Kröll, CoSee GmbH [Darmstadt], Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), SUPA School of Physics and Astronomy [Edinburgh], University of Edinburgh, Polish Academy of Sciences (PAN), Department of Physics, University of Surrey, University of Surrey (UNIS), Department of Physics, Faculty of Science, Middle East Technical University, Ankara, Turkey, Department of Fusion Plasma Physics [Stockholm] (KTH), Royal Institute of Technology [Stockholm] (KTH ), University of Cologne, Vinča Institute of Nuclear Sciences, University of Belgrade [Belgrade], Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Comenius University in Bratislava, University of Warsaw (UW), Faculty of Science Astronomy, Ankara University, Tandogan Ankara, TR-06100 Turkey, obasturk@ankara.edu.tr, Polska Akademia Nauk = Polish Academy of Sciences (PAN), RIKEN Nishina Center for Accelerator-Based Science [Wako] (RIKEN RNC), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Uppsala Universitet [Uppsala], Kernfysisch Versneller Instituut (KVI), University of Groningen [Groningen], Uppsala University, Michigan State University [East Lansing], Michigan State University System, RISING, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Blank, B., and Technische Universität München [München] (TUM)

Subjects
Sn, Nuclear and High Energy Physics, Proton, QC1-999, SHELL model, Closure (topology), Shell (structure), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Space (mathematics), 01 natural sciences, Subatomär fysik, Shell model, Fragmentation (mass spectrometry), Subatomic Physics, 0103 physical sciences, ddc:530, Neutron, 010306 general physics, Effective charges near Sn, Physics, 010308 nuclear & particles physics, Effective charges near, Polarization (waves), ddc, Effective charges near Sn-100, Electromagnetic transitions, Effective charges near 100Sn, Atomic physics
Abstract

Physics letters / B 820, 136591 (2021). doi:10.1016/j.physletb.2021.136591, Published by North-Holland Publ., Amsterdam

Published
2021

7. Superdeformed and Triaxial States in Ca 42

Author

G. Benzoni, Bo Cederwall, M. Komorowska, Begoña Quintana, D. Rosso, J. Styczen, Damiano Bortolato, J. J. Valiente Dobon, P. Bednarczyk, L. Charles, M. Ziȩbliński, W. Korten, R. Nicolini, L. Próchniak, P. Reiter, D. R. Napoli, T. Habermann, A. Maj, A. Gottardo, L. Berti, A. Lopez-Martens, G. Rampazzo, J. L. Wood, F. Nowacki, P. J. Coleman-Smith, C. Michelagnoli, B. Bounthong, S. Franchoo, P. Cocconi, T. Abraham, J. Ljungvall, Marco Bellato, M. Kicińska-Habior, P. Désesquelles, G. Anil Kumar, J. Mierzejewski, N. Kondratyev, K. Hadyńska-Klȩk, A. Korichi, P. A. Söderström, E. Sahin, Agnese Giaz, M. Kisieliński, F. Recchia, Benedicte Million, X. Grave, A. Gadea, N. Toniolo, S. F. Özmen, G. Maron, O. Stezowski, D. Karpiński, E. Farnea, S. Lunardi, S. Leoni, H. Naïdja, M. Palacz, J. Srebrny, D. Bazzacco, J. Iwanicki, F. Azaiez, B. Dulny, Joël Chavas, Roberto Isocrate, Alberto Pullia, G. Jaworski, P. J. Napiorkowski, J. Eberth, M. Gulmini, M. Kmiecik, Megumi Niikura, G. de Angelis, V. Vandone, M. Krzysiek, N. Karkour, F. C. L. Crespi, I. Stefan, B. Bruyneel, Ch. Theisen, M. Ciemala, A. Obertelli, M. Zielinska, Andrea Corsi, D. M. Cullen, B. Fornal, R. Menegazzo, C. A. Ur, K. Rusek, R. Wadsworth, A. Colombo, S. Myalski, G. Lehaut, A. Jungclaus, M. Kowalczyk, A. Czermak, W. Mȩczyński, B. Birkenbach, D. T. Doherty, M. D. Salsac, D. S. Judson, K. Mazurek, J. Grȩbosz, D. Mengoni, Tomás R. Rodríguez, B. Wasilewska, S. Brambilla, F. Camera, Andreas Görgen, E. Merchan, Andreas Wiens, K. Wrzosek-Lipska, Herbert Hess, N. Redon, European Commission, Federal Ministry of Education and Research (Germany), National Science Centre (Poland), Generalitat Valenciana, Nuclear Astrophysics Virtual Institute (Germany), Helmholtz Association, Ministerio de Economía y Competitividad (España), Research Council of Norway, Laboratori Nazionali di Legnaro, Helmholtz Centre for Heavy Ion Research, and University of Warsaw

Subjects
Physics, Sideband, 010308 nuclear & particles physics, SHELL model, Nuclear Theory, General Physics and Astronomy, Coulomb excitation, 7. Clean energy, 01 natural sciences, Superdeformation, Matrix (mathematics), Physics and Astronomy (all), 0103 physical sciences, AGATA, Atomic physics, 010306 general physics
Abstract

K. Hadyńska-Kl¸ek et al. ; 7 pags., 3 figs., 2 tabs., Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in Ca42 were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 02+ has been obtained and the role of triaxiality in the A∼40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time. © 2016 American Physical Society, Special gratitude goes to the INFN LNL and HIL Warsaw technical staff for their support and help, in particular, the accelerator crews for providing intense and good-quality 42Ca and 32S beams. K. H.-K. acknowledges support from the Research Council of Norway under the project Grant No. 213442. T. R. R. acknowledges computing time at GSI-Darmstadt and support from Spanish MINECO under Programa Ramon y Cajal 11420 and FIS-2014-53434-P, H. N. acknowledges support from Helmholtz Association through the Nuclear Astrophysics Virtual Institute NAVI (No. VH-VI-417). We also acknowledge the support by Generalitat Valenciana, Spain, under the grant PROMETEOII/2014/019 and by the FEDER funds of the European Commission (A. Gadea), Spanish Ministerio de Economía y Competitividad under Contract No. FPA2014-57196-C5 (A. J., A. Gadea), German Bundesministerium für Bildung und Forschung (BMBF) under Contract No. 05P12PKFNE TP4 (B. Birkenbach), the Polish National Science Centre under Projects No. DEC-2013/10/M/ST2/00427, No. DPN/N190/ AGATA/2009, No. 2011/03/B/ST2/01894, No. UMO- 2014/14/M/ST2/00738 (COPIN-INFN Collaboration), and No. 2015/17/B/ST2/01534.

Published
2016

8. Proton–hole excitation in the closed shell nucleus 205Au

Author

D. Mücher, Zhi Liu, Enrique Casarejos, I. Kojouharov, P. Doornenbal, J. J. Valiente-Dobón, C. Mihai, S. Pietri, Robert Hoischen, H. Grawe, J. Grȩbosz, W. Gelletly, I. J. Cullen, K. H. Maier, A. M. Denis Bacelar, A. Algora, H. J. Wollersheim, Atsushi Tamii, M. Górska, Stanislav Tashenov, N. Alkhomashi, Hans Geissel, S. J. Steer, G. Benzoni, Philip M Walker, H. Schaffner, Rajesh Kumar, A. Blazhev, G. F. Farrelly, A. B. Garnsworthy, Zs. Podolyák, J. Gerl, L. Caceres, P. J. Woods, J. Benlliure, Alison Bruce, P. Boutachkov, S. Lalkovski, P. H. Regan, M. E. Estevez, Berta Rubio, F. Molina, and Y. Fujita

Subjects
Physics, Nuclear and High Energy Physics, Particle decay, Proton, Neutron, Electron, Atomic physics, Nuclear Experiment, Spectroscopy, Beta decay, Open shell, Charged particle
Abstract

The neutron-rich N = 126 nucleus Au-205 has been populated following the relativistic energy projectile fragmentation of E/A = 1 GeV Pb-208, and studied via charged-particle decay spectroscopy. An internal decay with a transition energy of 907(5) keV and a half-life of T-1/2 = 6(2) s has been identified through the observation of the corresponding K and L internal conversion electron lines. The 907 keV energy level corresponds to the pi h(11/2)(-1) proton-hole state and decays both internally into the pi d(3/2)(-1) ground-state and via beta decay into Hg-205. The obtained data provides information on the evolution of single-proton hole energies which are vital inputs of shell model descriptions for nuclei around the Pb-208(82)126 doubly magic core. (C) 2009 Elsevier B.V. All rights reserved.

Published
2009

9. The T=2 mirrors 36Ca and 36S: A test for isospin symmetry of shell gaps at the driplines

Author

F. C. L. Crespi, Zs. Podolyák, S. Chmel, T. Beck, L. Caceres, A. Banu, Helmut Weick, S.K. Mandal, J. Grȩbosz, F. Becker, F. Camera, J. Gerl, Norio Saito, P. Reiter, P. Bednarczyk, Benedicte Million, H. Schaffner, H. Grawe, N. Kurz, H. J. Wollersheim, H. Hübel, T. Striepling, A. Maj, Yutaka Utsuno, O. Kavatsyuk, I. Kojouharov, M. Kmiecik, M. Seidlitz, A. Richard, J. Walker, A. Al-Khatib, M. Górska, W. Meczynski, O. Wieland, T. Saito, P. Doornenbal, M. Kavatsyuk, R. Lozeva, Hans Geissel, A. Bracco, G. Benzoni, A. Bürger, Takaharu Otsuka, M. Winkler, and N. Warr

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Isotope, Fragmentation (mass spectrometry), Excited state, Isospin, SHELL model, Coulomb, Neutron, Atomic physics, Spectroscopy
Abstract

The first excited 2+2+ state of 36Ca has been identified by its γ -decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest Tz=−2Tz=−2 nucleus in the Segré chart in which a γ-decay of an excited state has been observed. A stable beam of 40Ca at View the MathML source420AMeV impinged on a primary 9Be target. Out of the secondary beam of fragmentation products, 37Ca was separated by the FRS and struck on a second 9Be target at the final focus of the FRS. The energy for the View the MathML source21+ decay of 36Ca was determined to be 3015(16) keV, which is 276 keV lower than in its T=2T=2 mirror 36S. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a 16O core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from 17O and 17F. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N , Z=14,16Z=14,16 subshell gaps towards the driplines. Especially the N , Z=16Z=16 gap is determined by Thomas–Ehrman shift in the A=17A=17, T=1/2T=1/2 isospin doublet, while Coulomb effects are found to have marginal influence. ispartof: Physics Letters B vol:647 issue:4 pages:237-242 status: published

Published
2007

10. Tz=−1→0βdecays ofNi54,Fe50,Cr46, andTi42and comparison with mirror(He3,t)measurements

Author

D. Pauwels, J. L. Tain, J. J. Valiente-Dobón, Hiroshi Matsubara, P. Doornenbal, A. Algora, S. Pietri, S. Verma, A. I. Morales, D. Pérez-Loureiro, M. Gascon, F. Molina, W. Gelletly, J. Grȩbosz, H. J. Wollersheim, Robert Hoischen, Atsushi Tamii, Rajesh Kumar, Yoshitaka Fujita, Stanislav Tashenov, E. Ganioglu, P. Boutachkov, H. Schaffner, L. Amon Susam, Y. Oktem, A. Gadea, C. Domingo-Pardo, B. Rubio, S. J. Steer, W. Prokopowicz, Hans Geissel, Enrique Casarejos, I. Kojouharov, L. Caceres, J. Agramunt, J. Benlliure, Dirk Rudolph, R. B. Cakirli, N. Kurz, M. Górska, Zs. Podolyák, and J. Gerl

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), High resolution, Gamma spectroscopy, Sensitivity limit, Atomic physics, Beta decay, Excitation, Charge exchange, Fermi Gamma-ray Space Telescope
Abstract

We have studied the β decay of the Tz=−1, f7/2 shell nuclei Ni54, Fe50, Cr46, and Ti42 produced in fragmentation reactions. The proton separation energies in the daughter Tz=0 nuclei are relatively large (≈4–5 MeV) so studies of the γ rays are essential. The experiments were performed at GSI as part of the Stopped-beam campaign with the RISING setup consisting of 15 Euroball Cluster Ge detectors. From the newly obtained high precision β-decay half-lives, excitation energies, and β branching ratios, we were able to extract Fermi and Gamow-Teller transition strengths in these β decays. With these improved results it was possible to compare in detail the Gamow-Teller (GT) transition strengths observed in beta decay including a sensitivity limit with the strengths of the Tz=+1 to Tz=0 transitions derived from high resolution (3He,t) reactions on the mirror target nuclei at RCNP, Osaka. The accumulated B(GT) strength obtained from both experiments looks very similar although the charge exchange reaction provides information on a broader energy range. Using the “merged analysis” one can obtain a full picture of the B(GT) over the full Qβ range. Looking at the individual transitions some differences are observed, especially for the weak transitions. Their possible origins are discussed. (Less)

Published
2015

11. Isospin symmetry in thesdshell: Transition strengths in the neutron-deficientsdshell nucleusAr33

Author

E. Merchan, P. Doornenbal, Oliver Wieland, P. Reiter, S. Pietri, A. Algora, H. J. Wollersheim, T. Habermann, Pavel Golubev, B. Siebeck, H. Grawe, L. Scruton, Zs. Podolyák, J. Gerl, Jan Taprogge, J. Grȩbosz, F. C. L. Crespi, A. I. Morales, Benedicte Million, N. S. Bondili, Dirk Rudolph, M. Hackstein, Douglas D. DiJulio, M. A. Bentley, Norbert Pietralla, G. Guastalla, Joakim Cederkäll, D. Ralet, N. Braun, Jnaneswari Gellanki, M. Bowry, K. Geibel, Robert Hoischen, P. Boutachkov, A. Blazhev, A. Bracco, Anna Wendt, N. Warr, D. Bloor, M. Reese, K. Moschner, F. Camera, A. Jungclaus, and F. Ameil

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Ion beam, Nuclear Theory, Coulomb excitation, Ion, Nuclear physics, Excited state, Gamma spectroscopy, Neutron, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Reduced transition strengths of the deexciting transitions from the first two excited states in 33Ar were measured in a relativistic Coulomb excitation experiment at the GSI Helmholtz center. The radioactive ion beam was produced by fragmentation of a primary 36Ar beam on a 9Be target followed by the selection of the reaction product of interest via the GSI Fragment Separator. The 33Ar beam hit a secondary 197Au target with an energy of approximately 145 MeV/nucleon. An array of high-purity germanium cluster detectors and large-volume BaF2 scintillator detectors were employed for γ -ray spectroscopy at the secondary target position. The Lund-York-Cologne Calorimeter was used to track the outgoing ions and to identify the nuclear reaction channels. For the two lowest energy excited states of 33Ar the reduced transition strengths have been determined. With these first results the Tz = −3/2 nucleus 33Ar is now, together with 21Na (Tz = −1/2), the only neutron-deficient odd-A sd shell nucleus in which experimental transition strengths are available. The experimental values are compared to results of shell-model calculations which describe simultaneously mirror-energy differences and transition-strength values of mirror pairs in the sd shell in a consistent way

Published
2014

12. Hindered Gamow-Teller Decay to the Odd-OddN=ZGa62: Absence of Proton-NeutronT=0Condensate inA=62

Author

J. J. Valiente-Dobón, Pedro Sarriguren, Robert Page, D. Bazzacco, B. Rubio, Dirk Rudolph, A. N. Steer, N. Kurz, S. M. Lenzi, S. Verma, P. Doornenbal, M. Górska, L. Caceres, Sami Rinta-Antila, G. de Angelis, N. Alkhomashi, L. Amon Susam, Maria Doncel, O. Wieland, Zs. Dombrádi, R. Wadsworth, E. Ganioǧlu, J. Agramunt, R. Orlandi, F. Molina, W. Gelletly, H. J. Wollersheim, J. Grȩbosz, E. Farnea, J. Benlliure, P. Boutachkov, Alejandro Algora, R. B. Cakirli, Zs. Podolyák, B. S. Nara Singh, A. I. Morales, A. Gottardo, Begoña Quintana, S. Pietri, P. H. Regan, A. Gadea, D. Mengoni, T. Hüyük, Alfredo Poves, E. Grodner, Dolores Pérez, C. Domingo-Pardo, F. C. L. Crespi, A. Bracco, G. Benzoni, Y. Oktem, J. Gerl, and S. Leoni

Subjects
Physics, Proton, Double beta decay, Excited state, Nuclear Theory, Quasiparticle, General Physics and Astronomy, Neutron, Atomic physics, Nuclear Experiment, Random phase approximation, Ground state, Spin (physics)
Abstract

Search for a new kind of superfluidity built on collective proton-neutron pairs with aligned spin is performed studying the Gamow-Teller decay of the T=1, Jπ=0+ ground state of Ge62 into excited states of the odd-odd N=Z nucleus Ga62. The experiment is performed at GSI Helmholtzzentrum fur Schwerionenforschung with the Ge62 ions selected by the fragment separator and implanted in a stack of Si-strip detectors, surrounded by the RISING Ge array. A half-life of T1/2=82.9(14) ms is measured for the Ge62 ground state. Six excited states of Ga62, populated below 2.5 MeV through Gamow-Teller transitions, are identified. Individual Gamow-Teller transition strengths agree well with theoretical predictions of the interacting shell model and the quasiparticle random phase approximation. The absence of any sizable low-lying Gamow-Teller strength in the reported beta-decay experiment supports the hypothesis of a negligible role of coherent T=0 proton-neutron correlations in Ga62. (Less)

Published
2014

13. Analysis and results of the 104Sn Coulomb excitation experiment

Author

K. Moschner, C. Domingo Pardo, F Schirru, Johan Nyberg, F. Nowacki, I. Kojouharov, Rajesh Kumar, H. J. Wollersheim, P. Reiter, F. Ameil, Douglas D. DiJulio, E. Merchan, J. Jolie, Zs. Podolyák, J. Gerl, M. A. Bentley, S. Brambilla, P. Boutachkov, A. Obertelli, J. S. Winfield, T Swaleh, A. Jungclaus, Kjell Jansson, F. Farinon, M. Pfützner, F. Camera, D. Bloor, R. Wadsworth, Joakim Cederkäll, R. Knoebel, Dirk Rudolph, S. Pietri, Robert Hoischen, A Prochazka, A. Atac, C. Nociforo, T. Habermann, N. Braun, Anna Wendt, G. Guastalla, J. Grȩbosz, Oliver Wieland, A. Algora, H. Grawe, N. Kurz, M. Górska, N. Lalović, D. Ralet, H. Schaffner, A. Blazhev, N. Goel, N. Warr, F. Naqvi, B. S. Nara Singh, Norbert Pietralla, Alfredo Estrade, J. Kurcewicz, T. Arici, Jan Taprogge, L Scruton, Helmut Weick, Pavel Golubev, SCOAP, and Ministerio de Ciencia e Innovación (España)

Subjects
Physics, History, Quadrupole, Coulomb excitation, Atomic physics, Energy (signal processing), Spectral line, Computer Science Applications, Education
Abstract

G. Guastalla, et al. XX International School on Nuclear Physics, Neutron Physics and Applications (Varna 2013); 5 pags.; 1 fig., The analysis of the Coulomb excitation experiment conducted on 104Sn required a strict selection of the data in order to reduce the large background present in the γ-ray energy spectra and identify the γ-ray peak corresponding to the Coulomb excitation events. As a result the B(E2; 0+ →2+) value could be extracted, which established the downward trend towards 100Sn and therefore the robustness of the N=Z=50 core against quadrupole excitations. Published under licence by IOP Publishing Ltd, A. J. would like to thank the Spanish Ministerio de Ciencia e Innovacion for financial support under Contract No. FPA2011-29854- C04

Published
2014

14. High-spin states in 212Po above the α-decaying (18+) isomer

Author

L. Zago, A. Gottardo, J.J. Valiente-Dobón, G. Benzoni, A. Gadea, M. Górska, S. Lunardi, Zs. Podolyák, P.H. Regan, D. Rudolph, A. Algora, G. de Angelis, D. Bazzacco, J. Benlliure, P. Boutachkov, A. Bracco, A.M. Bruce, F. Camera, E. Casarejos, M.L. Cortés, F.C.L. Crespi, A. Corsi, C. Domingo-Pardo, M. Doncel, T. Engert, H. Geissel, J. Gerl, A. Goasduff, N. Goel, J. Grebosz, E. Gregor, T. Habermann, S. Klupp, I. Kojouharov, N. Kurz, S.M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, A.I. Morales, D.R. Napoli, F. Naqvi, C. Nociforo, M. Pfützner, S. Pietri, A. Prochazka, F. Recchia, E. Sahin, H. Schaffner, A. Sharma, B. Sitar, D. Siwal, P. Strmen, I. Szarka, C.A. Ur, P.M. Walker, H. Weick, O. Wieland, and H.-J. Wollersheim

Subjects
γ spectroscopy, Isomer spectroscopy, High-spin spectroscopy, Physics, QC1-999
Abstract

The nucleus 212Po has been produced through the fragmentation of a 238U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21− isomeric state feeding the α-emitting 45-s (18+) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23+ metastable state. These are the first observations of high-spin states above the 212Po (18+) isomer, by virtue of the selectivity obtained via ion-by-ion identification of 238U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼100 is sensitive.

Published
2022
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15. The population of metastable states as a probe of relativistic-energy fragmentation reactions

Author

R. Nicolini, I. Kojouharov, K. Steiger, S. Verma, A. Algora, Robert Hoischen, J. Benlliure, Alison Bruce, S. Pietri, A. M. Denis Bacelar, A. Prochazka, J. Grȩbosz, A. Bracco, J. J. Valiente-Dobón, A. Y. Deo, A. Musumarra, M. Górska, C. Domingo-Pardo, Helmut Weick, B. Rubio, A. I. Morales, I. J. Cullen, K.-H. Schmidt, M. V. Ricciardi, Enrico Calore, Dirk Rudolph, N. Alkhomashi, Maria Doncel, D. Montanari, N. Goel, S. Leoni, S. Lalkovski, G. F. Farrelly, P. H. Regan, Hans Geissel, Zs. Podolyák, J. Gerl, D. R. Napoli, F. Molina, T.P.D. Swan, Philip M Walker, N. Kurz, Imrich Szarka, N. Al-Dahan, C. Nociforo, Zs. Dombrádi, F. Farinon, W. Gelletly, H. J. Wollersheim, S. J. Steer, W. Prokopowicz, Peter Strmen, P. Boutachkov, H. Schaffner, P. Detistov, and Enrique Casarejos

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, Relativistic energy, Population, Gamma ray, Expected value, Nuclear physics, Fragmentation (mass spectrometry), Metastability, Subatomic Physics, Atomic physics, education, Spin (physics), Beam (structure)
Abstract

Isomeric ratios have been measured for high-spin states in Po-198,200,206,208(84), At-208,209,210,211(85), Rn-210,211,212,213,214(86), Fr-208,211,212,213,214(87), Ra-210,211,212,214,215(88), and Ac-215(89) following the projectile fragmentation of a 1 AGeV U-238 beam by a Be-9 target at GSI Helmholtzzentrum fur Schwerionenforschung. The fragments were separated in the fragment separator (FRS) and identified by means of energy loss and time-of-flight techniques. They were brought to rest at the centre of the RISING gamma-ray detector array and intensities of gamma rays emitted in the decay of isomeric states with half-lives between 100 ns and 40 mu s and spin values up to 55/2 (h) over bar were used to obtain the corresponding isomeric ratios. The data are compared to theoretical isomeric ratios calculated in the framework of the abrasion-ablation model. Large experimental enhancements are obtained for high-spin isomers in comparison to expected values. (C) 2013 Elsevier B.V. All rights reserved.

Published
2013

16. Coulomb Excitation ofSn104and the Strength of theSn100Shell Closure

Author

M. Górska, K. Moschner, H. J. Wollersheim, P. Reiter, Johan Nyberg, Alfredo Estrade, Robert Hoischen, B. S. Nara Singh, L. Scruton, F Schirru, A. Atac, Zs. Podolyák, J. Gerl, F. Nowacki, F. Ameil, Norbert Pietralla, Kjell Jansson, S. Pietri, F. Farinon, T. Habermann, Dirk Rudolph, C. Nociforo, Zs. Dombrádi, Anna Wendt, T. Arici, M. Pfützner, C. Domingo Pardo, Jan Taprogge, R. Wadsworth, N. Braun, Dóra Sohler, H. Grawe, D. Ralet, S. Brambilla, H. Schaffner, A. Blazhev, Oliver Wieland, E. Merchan, N. Lalović, N. Goel, N. Warr, Helmut Weick, J. S. Winfield, F. Camera, T. Swaleh, N. Kurz, G. Guastalla, A. Obertelli, I. Kojouharov, K. Sieja, Pavel Golubev, R. Knoebel, M. A. Bentley, P. Boutachkov, Alejandro Algora, Joakim Cederkäll, Rajesh Kumar, A. Prochazka, Zs. Vajta, J Kurcewicz, J. Grȩbosz, Douglas D. DiJulio, F. Naqvi, D. Bloor, A. Jungclaus, and J. Jolie

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Nuclear Theory, SHELL model, Nuclear structure, General Physics and Astronomy, Coulomb excitation, 7. Clean energy, 01 natural sciences, Key point, medicine.anatomical_structure, 13. Climate action, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleus, Excitation
Abstract

A measurement of the reduced transition probability for the excitation of the ground state to the first 2+ state in 104Sn has been performed using relativistic Coulomb excitation at GSI. 104Sn is the lightest isotope in the Sn chain for which this quantity has been measured. The result is a key point in the discussion of the evolution of nuclear structure in the proximity of the doubly magic nucleus 100Sn. The value B(E2; 0+ → 2+) = 0.10(4) e2b2 is significantly lower than earlier results for 106Sn and heavier isotopes. The result is well reproduced by shell model predictions and therefore indicates a robust N = Z = 50 shell closure.

Published
2013

17. Exotic nuclear studies around and below A = 100

Author

B. S. Nara Singh, R. Wadsworth, P. Boutachkov, A. Blazhev, Z. Liu, H. Grawe, T. S. Brock, N. Braun, M. Go, S. Pietri, D. Rudolph, C. Domingo-Pardo, S. J. Steer, A. Atac, L. Bettermann, L. Cáceres, K. Eppinger, T. Engert, T. Faestermann, F. Farinon, F. Finke, K. Geibel, J. Gerl, R. Gernhäuser, N. Goel, A. Gottardo, J. Grȩbosz, C. Hinke, R. Hoischen, G. llie, H. Iwasaki, J. Jolie, A. Kaşkaş, I. Kojouharov, R. Krücken, N. Kurz, E. Merchánt, C. Nociforo, J. Nyberg, M. Pfützner, A. Prochazka, Zs. Podolyák, P. H Regan, P. Reiter, S. Rinta-Antila, C. Scholl, H. Schaffner, P.-A. Söderström, N. Warr, H. Weick, H.-J. Wollersheim, P. J. Woods, F. Nowacki, K. Sieja, and Bertram Blank

Subjects
Nuclear physics, Physics, Nuclear Theory, SHELL model, Nuclear structure, Gamma spectroscopy, Context (language use), Nuclear Experiment, Spin (physics)
Abstract

A RISING experiment with an aim to study exotic Cd nuclei was carried out at GSI‐FRS facility. Some preliminary results from this experiment are presented here. In particular, the β decay of 96Cd to 96Ag revealed the existence of a high spin isomer predicted a few decades ago. In this context, the structures of both these nuclei are discussed. Shell model calculations using the Gross‐Frenkel interaction are used to interpret the results.

Published
2011

18. g factor of the 7- isomer in 126Sn and first observation of spin-alignment in relativistic fission

Author

H. Schaffner, H. J. Wollersheim, A. Jungclaus, M. Ionescu-Bujor, R. Lozeva, J. Gerl, M. Pfützner, Gary Simpson, W. Prokopowicz, J. M. Daugas, T.R. Saito, O. Perru, F. Becker, C. Brandau, S. K. Chamoli, M. De Rydt, S. Mallion, P. Bednarczyk, J. Jolie, I. Kojouharov, Michael Hass, N. Vermeulen, H. Grawe, A. Blazhev, N. Kurz, L. Caceres, Gerda Neyens, P. Doornenbal, A. Maj, G. Ilie, Zs. Podolyák, J. Walker, M. Górska, J. Grȩbosz, D. L. Balabanski, K. Turzó, M. Kmiecik, L. Atanasova, E. Werner-Malento, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), ILL, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Cluster decay, Isotope, Nuclear moments, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, g factor, Nuclear Theory, Shell model calculations, Lifetimes, Projectile fission reactions, 01 natural sciences, Microsecond, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Beam (structure)
Abstract

We report on the g factor measurement of the isomeric 7 − state ( E * = 2219 keV , T 1 / 2 = 5.9 ( 8 ) μs ) in the neutron-rich 126Sn nucleus. The nucleus was produced by the fission of a relativistic 238U beam and reaction products were selected by the FRS fragment separator at GSI. For the first time, spin-alignment was observed after relativistic fission. It was used to deduce the g factor of the 7 − isomeric state, g ( 7 − ) = − 0.098 ( 9 ) , from the measured perturbed angular distribution of its γ decay using the RISING Cluster detectors. The observed value confirms the suggested ν ( h 11 / 2 − 1 d 3 / 2 − 1 ) dominant configuration, which has been proposed for the 7 − isomers in neutron-rich Sn isotopes. The failure of the g factor additivity rule and the importance of core polarization evolution with increasing distance from the doubly-magic 132Sn is discussed. The first observation of 18(8)% of spin-alignment produced by the relativistic fission of a 238U beam paves the way to study moments of neutron-rich (sub-)microsecond isomers, which are difficult to align by other means.

Published
2010

19. Spin-alignment and g-factor measurement of the I(pi)=12(+) isomer in (192)Pb produced in the relativistic-energy fragmentation of a (238)U beam

Author

F. Becker, S. K. Chamoli, P. Bednarczyk, S. Mallion, W. Prokopowicz, J. M. Daugas, B. Million, W. Mȩczyński, E. Werner-Malento, A. Saltarelli, S. Chmel, M. Hass, A. Krasznahorkay, A. Maj, L. Caceres, Gerda Neyens, M. Ionescu-Bujor, D. Montanari, I. Kojuharov, P. Detistov, S. Brambilla, J. Gerl, F. Camera, P. Doornenbal, S. Pietri, M. Pfützner, M. Kmiecik, H. J. Wollersheim, Norio Saito, R. Lozeva, O. Wieland, L. Atanasova, J. Jolie, G. Ilie, J. Grȩbosz, G. S. Simpson, S. Myalski, K. H. Maier, M. Ciemała, G. Lo Bianco, Georgi P. Georgiev, N. Blasi, Dirk Rudolph, T. Saito, M. Lach, F. C. L. Crespi, Robert Hoischen, Zs. Podolyák, D. L. Balabanski, M. Ziȩbliński, N. Vermeulen, C. M. Petrache, K. Mazurek, M. Górska, A. Bracco, K. A. Gladnishki, S. Lakshmi, G. Benzoni, S. Leoni, R. Kulessa, H. Grawe, J. Styczen, DAM Île-de-France (DAM/DIF), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and ILL

Subjects
Physics, Nuclear and High Energy Physics, Magnetic moment, NUCLEI, 010308 nuclear & particles physics, Relativistic energy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FISSION, 01 natural sciences, 7. Clean energy, LISE, Separation process, SEPARATORS, GSI, Fragmentation (mass spectrometry), MOMENTS, 0103 physical sciences, Pi, ISOTOPES, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

The feasibility of measuring g -factors using the TDPAD method applied to high-energy, heavy fragmentation products is explored. The 2623keV $\ensuremath I^{\pi}=12^+$ isomer in 192Pb with $ \tau$ = 1.57 μs has been produced using the fragmentation of a 1A GeV 238U beam. The results presented demonstrate for the first time that such heavy nuclei produced in a fragmentation reaction with a relativistic beam are sufficiently well spin-aligned. Moreover, the rather large value of the alignment, 28(10)% of the maximum possible, is preserved during the separation process allowing the determination of magnetic moments. The measured values of the lifetime, $ \tau$ = 1.54(9) μs, and the g -factor, g = - 0.175(20) , agree with the results of previous investigations using fusion-evaporation reactions.

Published
2010

20. Evolution of the N = 82 shell gap below 132Sn inferred from core excited states in 131In

Author

Baharak Hadinia, P. Reiter, Dóra Sohler, P. Doornenbal, S. J. Steer, Enrique Casarejos, Rajesh Kumar, Thomas Beck, W. Prokopowicz, I. Kojouharov, S. Myalski, N. Kurz, G. S. Simpson, A. Jungclaus, H. J. Wollersheim, K. Andgren, Anton Khaplanov, M. Górska, H. Schaffner, G. Benzoni, J. Grȩbosz, Margareta Hellström, E. Werner-Malento, Piotr Bednarczyk, Dirk Rudolph, M. Kmiecik, Stanislav Tashenov, P. Detistov, F. C. L. Crespi, M. Pfützner, L. Caceres, H. Weick, J. Benlliure, Zs. Podolyák, J. Gerl, Alison Bruce, S.K. Mandal, G. Ilie, S. Lalkovski, P. H. Regan, Zs. Dombradi, J. Walker, Robert Hoischen, Bo Cederwall, Fernando Montes, A. Maj, O. Wieland, S. Pietri, Hans Geissel, V. Modamio, H. Grawe, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), European Commission, Ministry of Science and Higher Education (Poland), Ministerio de Educación y Ciencia (España), Science and Technology Facilities Council (UK), Swedish Research Council, Bulgarian National Science Fund, Department of Energy (US), Federal Ministry of Education and Research (Germany), Hungarian Scientific Research Fund, and Istituto Nazionale di Fisica Nucleare

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Proton, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Gamma ray, 01 natural sciences, 7. Clean energy, Fragmentation (mass spectrometry), Excited state, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Nuclear drip line, Atomic physics, 010306 general physics, Spectroscopy
Abstract

4 pags., 3 figs. -- PACS:21.10.-k21.10.Pc21.10.Tg21.60.Cs23.20.Lv, The γ-ray decay of an excited state in 131In, the one proton hole neighbor of the doubly magic 132Sn has been measured. A high-spin, core-excited isomer with T1 / 2 = 630 (60) ns was identified following production by both relativistic fragmentation of a 136Xe beam and fission of a 238U beam. This state deexcites by a single γ-ray branch of 3782(2) keV from which direct evidence for the size of the N = 82 shell gap is inferred. The results are discussed in comparison to a shell-model calculation including configurations across the closed shells at N = 82 and Z = 50. © 2009 Elsevier B.V. All rights reserved., This work is supported by the EU Access to LargeScale Facilities Programme (EURONS, EU contract 506065), the Polish Ministry of Science and Higher Education (1-P03B-030-30 and620/E-77/SPB/GSI/P-03/DWM105/2004-2007), the Spanish Ministerio de Educacion y Ciencia (FPA2005-00696, FPA2005-00732 andFPA2007-66069), EPSRC/STFC (UK), The Swedish Research Council,The Bulgarian Science Fund VUF06/05, The US Dept. of Energy (DE-FG02-91ER-40609 and DE-AC02-06CH11357), The German Federal Ministry of Education and Research (06KY205I), The Hungarian Sci-ence Foundation (OTKA K-68801) and the Italian INFN

Published
2009

21. ISOMER SPECTROSCOPY NEAR 132<font>Sn</font> — FIRST OBSERVATION OF EXCITED STATES IN 130<font>Cd</font>

Author

M. PFÜTZNER, A. JUNGCLAUS, M. GÓRSKA, L. CÁCERES, S. PIETRI, E. WERNER-MALENTO, H. GRAWE, K. LANGANKE, G. MARTÍNEZ-PINEDO, F. NOWACKI, A. POVES, J.J. CUENCA-GARCÍA, D. RUDOLPH, Z. PODOLYAK, P.H. REGAN, P. DETISTOV, S. LALKOVSKI, V. MODAMIO, J. WALKER, P. BEDNARCZYK, P. DOORNENBAL, H. GEISSEL, J. GERL, J. GRȨBOSZ, I. KOJOUHAROV, N. KURZ, W. PROKOPOWICZ, H. SCHAFFNER, H.J. WOLLERSHEIM, and null the RISING collaboration

Subjects
Materials science, Excited state, SHELL model, Atomic physics, Spectroscopy
Published
2008

22. ISOSPIN SYMMETRY AND PROTON DECAY: IDENTIFICATION OF THE 10+ ISOMER IN 54<font>Ni</font>

Author

Margareta Hellström, H. J. Wollersheim, A. Blazhev, M. A. Bentley, N. Kurz, M. Górska, Emma Johansson, H. Schaffner, Jason I. Brown, J. Grȩbosz, A. Jungclaus, P. Doornenbal, S. Pietri, Dirk Rudolph, F. Becker, P. Bednarczyk, L. Atanasova, L.-L. Andersson, Zs. Podolyák, I. Kojouharov, P. H. Regan, D. L. Balabanski, S. J. Steer, W. Prokopowicz, Claes Fahlander, L. Caceres, J. Gerl, A. B. Garnsworthy, Robert Hoischen, and C. Brandau

Subjects
Physics, Nuclear physics, Identification (information), Particle physics, Proton decay, Isospin, Symmetry (physics)
Published
2008

23. HEAVY NEUTRON-RICH NUCLEI PRODUCED IN THE FRAGMENTATION OF A 208<font>Pb</font> BEAM

Author

P. H. Regan, H. J. Wollersheim, Tomoki Saito, E. Warner-Malento, H. Grawe, N. Kurz, M. Górska, G. F. Farrelly, F. Becker, T. Shizuma, M. Pfützner, P. Bednarczyk, A. B. Garnsworthy, Fernando Montes, T. Kurtukian-Nieto, H. Schaffner, A. Kelic, G. Benzoni, S. J. Steer, Robert Hoischen, R. Kumar, W. Prokopowicz, Hans Geissel, S. Pietri, P. Doornenbal, J. Gerl, Andreas Martin Heinz, S. Tachenov, H. K. Maier, J. Grȩbosz, L. Caceres, A. Jungclaus, Zs. Podolyák, I. Kojouharov, Dirk Rudolph, B. A. Brown, and J. Benlliure

Subjects
Nuclear physics, Materials science, Fragmentation (mass spectrometry), Neutron, Atomic physics
Published
2008

24. COLLECTIVITY IN LIGHT NUCLEI AND THE GDR

Author

A. MAJ, J. STYCZEŃ, M. KMIECIK, P. BEDNARCZYK, M. BREKIESZ, J. GRȨBOSZ, M. LACH, W. MȨCZYŃSKI, M. ZIȨBLIŃSKI, K. ZUBER, A. BRACCO, F. CAMERA, G. BENZONI, S. LEONI, B. MILLION, and O. WIELAND

Subjects
Nuclear physics, Physics, Light nucleus, Low energy, Strength function, Thermal, Liquid drop, Atomic physics, Line (formation)
Abstract

The results are presented from the experiments using the EUROBALL and RFD/HECTOR arrays, concerning various aspects of collectivity in light nuclei. A superdeformed band in 42 Ca was found. A comparison of the GDR line shape data with the predictions of the thermal shape uctuation model, based on the most recent rotating liquid drop LSD calculations, shows evidence for a Jacobi shape transition in hot, rapidly rotating 46 Ti and strong Coriolis eects in the GDR strength function. The preferential feeding of the SD band in 42 Ca by the GDR low energy component was observed

Published
2005

25. Structure of polonium isotopes at high spin with RFD+Euroball IV

Author

B. Rossé, F. Camera, K. M. Spohr, P. Papka, D. Curien, A. Bracco, M. Brekiesz, M. Meyer, K. Keyes, M. Górska, I. Deloncle, J. Robin, A. Prévost, N. Redon, Alain Astier, W. Mȩczyński, P. Bednarczyk, M. G. Porquet, O. Dorvaux, M. Ziebliński, O. Stezowski, A. Maj, J.P. Vivien, J. E. Bastin, H. Hübel, Kai Zuber, B. J. P. Gall, T. Pawłat, A. Papenberg, J. Styczeń, J. Grȩbosz, Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EUROBALL, Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), and Heyd, Yvette

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Spin states, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, General Physics and Astronomy, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Recoil, chemistry, 0103 physical sciences, 010306 general physics, Spin (physics), Beam energy, Polonium
Abstract

An experiment has been performed to investigate the structure at high spin of the neutron-deficient polonium isotopes using the Recoil Filter Detector coupled to the EUROBALL IV gamma array. High spin states of 200,201 Po have been populated by the 30 Si +176 Yb reaction at a beam energy of 160 MeV. We report here the performances of the RFD + EUROBALL IV coupling.

Published
2003

26. Study of the soft dipole modes in 140Ce via inelastic scattering of 17O

Author

S. Brambilla, Herbert Hess, M. Ciemala, B. Million, S. Leoni, C. Boiano, S. M. Lenzi, E. Farnea, F. Recchia, Sunniva Siem, S. Bottoni, P. Bednarczyk, G. de Angelis, M. Kmiecik, M Krzysiek, B. Birkenbach, Stefano Riboldi, N. Blasi, Diego Barrientos, F. Camera, A. C. Larsen, D. Mengoni, O. Wieland, Andreas Görgen, A. Bracco, V. Vandone, T. Hüyük, J. Grȩbosz, W. Mȩczyński, A. Giaz, A. Maj, Luna Pellegri, G. Benzoni, A. Gottardo, C. A. Ur, Magne Guttormsen, R. Nicolini, Alexander Burger, J. J. Valiente-Dobón, P. Reiter, F. C. L. Crespi, S. Lunardi, A. I. Morales, C. Michelagnoli, T Steinbach, Andreas Wiens, A. Gadea, K Mazurek, D. R. Napoli, K. Geibel, B. Fornal, D. Bazzacco, and M. Ziȩbliński

Subjects
Nuclear reaction, Physics, Isovector, Scattering, Isoscalar, Nuclear Theory, Inelastic scattering, Condensed Matter Physics, Resonance (particle physics), Atomic and Molecular Physics, and Optics, Dipole, Giant resonance, Atomic physics, Mathematical Physics
Abstract

The main aim of this study was a deeper understanding of the nuclear structure properties of the soft dipole modes in 140 Ce, excited via inelastic scattering of weakly bound 17 O projectiles. An important aim was to investigate the ‘splitting’ of the PDR into two parts: a low-energy isoscalar component dominated by neutron-skin oscillations and a higher-energy component lying on the tail of the giant dipole resonance of a rather isovector character. This was already observed for this nucleus, investigated in (α, α′) and (γ, γ′) experiments. The experiment was performed at Laboratori Nazionali di Legnaro, Italy. Inelastic scattering of 17 O ion beam at − 2 0M eV A 1 was

Published
2014

27. First observation of excited states in [sup 199]At with the recoil filter detector

Author

D.J. Middleton, W. Mȩczyński, P. Bednarczyk, K. M. Spohr, M. Ziȩbliński, N. Schulz, A. Lopez-Martens, F. Hannachi, J.C. Merdinger, Peter M. Jones, M. Palacz, M. Wolińska, R. Chapman, M. Lach, J. Styczen, J. Grȩbosz, K. H. Maier, S. Courtin, M. B. Smith, and J. Kownacki

Subjects
Physics, Nuclear physics, Microsecond, Angular momentum, Recoil, Excited state, Nuclear structure, Gamma ray, Electron, Atomic physics, Nuclear Experiment, Radioactive decay
Abstract

We have deduced for the first time a level scheme for the {sup 199}At nucleus. The angular distribution data and the conversion electron information have allowed for multipolarity assignments and spin suggestions to be made. The current data and the level systematics of odd At isotopes suggest that the first excited state should be isomeric with a lifetime of the order of a microsecond.

Published
1999

28. Manifestation of the Berry phase in the atomic nucleus 213Pb

Author

J.J. Valiente-Dobón, A. Gottardo, G. Benzoni, A. Gadea, S. Lunardi, A. Algora, G. de Angelis, D. Bazzacco, J. Benlliure, P. Boutachkov, A. Bracco, A.M. Bruce, F. Camera, E. Casarejos, M.L. Cortés, F.C.L. Crespi, A. Corsi, C. Domingo-Pardo, M. Doncel, T. Engert, H. Geissel, J. Gerl, A. Goasduff, N. Goel, M. Górska, J. Grebosz, E. Gregor, T. Habermann, S. Klupp, I. Kojouharov, N. Kurz, S.M. Lenzi, S. Leoni, S. Mandal, R. Menegazzo, D. Mengoni, B. Million, A.I. Morales, D.R. Napoli, F. Naqvi, C. Nociforo, M. Pfützner, S. Pietri, Zs. Podolyák, A. Prochazka, F. Recchia, P.H. Regan, D. Rudolph, E. Sahin, H. Schaffner, A. Sharma, B. Sitar, D. Siwal, P. Strmen, I. Szarka, C.A. Ur, P.M. Walker, H. Weick, O. Wieland, H.-J. Wollersheim, and P. Van Isacker

Subjects
Physics, QC1-999
Abstract

The neutron-rich 213Pb isotope was produced in the fragmentation of a primary 1 GeV A 238U beam, separated in FRS in mass and atomic number, and then implanted for isomer decay γ-ray spectroscopy with the RISING setup at GSI. A newly observed isomer and its measured decay properties indicate that states in 213Pb are characterized by the seniority quantum number that counts the nucleons not in pairs coupled to angular momentum J=0. The conservation of seniority is a consequence of a geometric phase associated with particle-hole conjugation, which becomes observable in semi-magic nuclei where nucleons half-fill the valence shell. The γ-ray spectroscopic observables in 213Pb are thus found to be driven by two mechanisms, particle-hole conjugation and seniority conservation, which are intertwined through a Berry phase.

Published
2021
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29. High-energy excited states in98Cd

Author

A. Atac, S. J. Steer, I. Kojouharov, Dirk Rudolph, J. Grȩbosz, H. J. Wollersheim, L. Caceres, Johan Nyberg, C. Domingo-Pardo, Helmut Weick, C. Hinke, Tina Penick Brock, Frédéric Nowacki, T. Engert, P. Reiter, H. Iwasaki, R. Wadsworth, K. Eppinger, P. J. Woods, Zs. Podolyák, J. Gerl, A. Prochazka, M. Górska, T. Faestermann, P. A. Söderström, P. H. Regan, S. Pietri, E. Merchan, N. Braun, C. Nociforo, A. Blazhev, J. Jolie, B. S. Nara Singh, F. Finke, H. Grawe, N. Kurz, G. Ilie, H. Schaffner, F. Farinon, P. Boutachkov, L. Bettermann, N. Goel, K. Geibel, Zh Liu, Sami Rinta-Antila, M. Pfützner, N. Warr, Robert Hoischen, A. Gottardo, R. Krücken, and C. Scholl

Subjects
Physics, Nuclear physics, History, High energy, Excited state, Physics::Atomic and Molecular Clusters, Nuclear structure, Atomic physics, Computer Science Applications, Education
Abstract

In 98Cd a new high-energy isomeric γ-ray transition was identified, which confirms previous spin-parity assignments and enables for the first time the measurement of the E2 and E4 strength for the two decay branches of the isomer. Preliminary results on the 98Cd high-excitation level scheme are presented. A comparison to shell-model calculations as well as implications for the nuclear structure around 100Sn are discussed.

Published
2010

30. Erratum to: 'Neutron–proton pairing competition in N=Z nuclei: Metastable state decays in the proton dripline nuclei 8241Nb and 8643Tc' [Phys. Lett. B 660 (2008) 326]

Author

H. J. Wollersheim, F. Camera, H. Schaffner, T. Saito, J. Gerl, S. Pietri, M. Górska, H. Grawe, N. Kurz, G. Benzoni, M. Kmiecik, S. Schwertel, I. Kojouharov, O. Wieland, Zs. Podolyák, Zs. Dombrádi, F. Becker, Zhi Liu, Andreas Martin Heinz, T. Kurtukian-Nieto, F. G. Kondev, B. Blank, E. Werner-Malento, A. Jungclaus, W. N. Catford, P. Bednarczyk, S. J. Steer, Hans Geissel, T. Shizuma, J. Grȩbosz, W. Prokopowicz, Robert Hoischen, A. B. Garnsworthy, M. Pfützner, Dirk Rudolph, P. Doornenbal, J. Jolie, Alison Bruce, A. Kelic, G. A. Jones, G. Ilie, L. Caceres, A. Maj, I. J. Cullen, Fernando Montes, A. J. Simons, S. Myalski, P. M. Walker, S. Tachenov, E. Estevez, S. Lalkovski, P. H. Regan, Furong Xu, C. Brandau, Yang Sun, and W. Gelletly

Subjects
Physics, Nuclear and High Energy Physics, Proton, Pairing, Metastability, Neutron, Atomic physics
Abstract

Erratum Erratum to: “Neutron–proton pairing competition in N = Z nuclei: Metastable state decays in the proton dripline nuclei 82 41Nb and 86 43Tc” [Phys. Lett. B 660 (2008) 326] A.B. Garnsworthy a,b,∗, P.H. Regan a, L. Caceres c,d, S. Pietri a, Y. Sun e,f, D. Rudolph g, M. Gorska c, Zs. Podolyak a, S.J. Steer a, R. Hoischen g,c, A. Heinz b, F. Becker c, P. Bednarczyk c,h, P. Doornenbal c, H. Geissel c, J. Gerl c, H. Grawe c, J. Grȩbosz h,c, A. Kelic c, I. Kojouharov c, N. Kurz c, F. Montes c, W. Prokopowicz c, T. Saito c, H. Schaffner c, S. Tachenov c, E. Werner-Malento c,i, H.J. Wollersheim c, G. Benzoni j, B.B. Blank k, C. Brandau a,c, A.M. Bruce l, F. Camera j, W.N. Catford a, I.J. Cullen a, Zs. Dombradim, E. Estevez n, W. Gelletly a, G. Ilie o,p, J. Jolie o, G.A. Jones a, A. Jungclaus d, M. Kmiecik h, F.G. Kondev q, T. Kurtukian-Nieto n,k, S. Lalkovski l,r, Z. Liu a, A. Maj h, S. Myalski h, M. Pfutzner i, S. Schwertel s, T. Shizuma a,t, A.J. Simons u,a, P.M. Walker a, O. Wieland j, F.R. Xu v

Published
2008

31. Superdeformed and Triaxial States in ^{42}Ca.

Author

Hadyńska-Klȩk K, Napiorkowski PJ, Zielińska M, Srebrny J, Maj A, Azaiez F, Valiente Dobón JJ, Kicińska-Habior M, Nowacki F, Naïdja H, Bounthong B, Rodríguez TR, de Angelis G, Abraham T, Anil Kumar G, Bazzacco D, Bellato M, Bortolato D, Bednarczyk P, Benzoni G, Berti L, Birkenbach B, Bruyneel B, Brambilla S, Camera F, Chavas J, Cederwall B, Charles L, Ciemała M, Cocconi P, Coleman-Smith P, Colombo A, Corsi A, Crespi FC, Cullen DM, Czermak A, Désesquelles P, Doherty DT, Dulny B, Eberth J, Farnea E, Fornal B, Franchoo S, Gadea A, Giaz A, Gottardo A, Grave X, Grȩbosz J, Görgen A, Gulmini M, Habermann T, Hess H, Isocrate R, Iwanicki J, Jaworski G, Judson DS, Jungclaus A, Karkour N, Kmiecik M, Karpiński D, Kisieliński M, Kondratyev N, Korichi A, Komorowska M, Kowalczyk M, Korten W, Krzysiek M, Lehaut G, Leoni S, Ljungvall J, Lopez-Martens A, Lunardi S, Maron G, Mazurek K, Menegazzo R, Mengoni D, Merchán E, Mȩczyński W, Michelagnoli C, Mierzejewski J, Million B, Myalski S, Napoli DR, Nicolini R, Niikura M, Obertelli A, Özmen SF, Palacz M, Próchniak L, Pullia A, Quintana B, Rampazzo G, Recchia F, Redon N, Reiter P, Rosso D, Rusek K, Sahin E, Salsac MD, Söderström PA, Stefan I, Stézowski O, Styczeń J, Theisen Ch, Toniolo N, Ur CA, Vandone V, Wadsworth R, Wasilewska B, Wiens A, Wood JL, Wrzosek-Lipska K, and Ziȩbliński M

Abstract

Shape parameters of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in ^{42}Ca were determined from E2 matrix elements measured in the first low-energy Coulomb excitation experiment performed with AGATA. The picture of two coexisting structures is well reproduced by new state-of-the-art large-scale shell model and beyond-mean-field calculations. Experimental evidence for superdeformation of the band built on 0&#95;{2}^{+} has been obtained and the role of triaxiality in the A∼40 mass region is discussed. Furthermore, the potential of Coulomb excitation as a tool to study superdeformation has been demonstrated for the first time.

Published
2016
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32. Coulomb excitation of 104Sn and the strength of the 100Sn shell closure.

Author

Guastalla G, DiJulio DD, Górska M, Cederkäll J, Boutachkov P, Golubev P, Pietri S, Grawe H, Nowacki F, Sieja K, Algora A, Ameil F, Arici T, Atac A, Bentley MA, Blazhev A, Bloor D, Brambilla S, Braun N, Camera F, Dombrádi Z, Domingo Pardo C, Estrade A, Farinon F, Gerl J, Goel N, Grȩbosz J, Habermann T, Hoischen R, Jansson K, Jolie J, Jungclaus A, Kojouharov I, Knoebel R, Kumar R, Kurcewicz J, Kurz N, Lalović N, Merchan E, Moschner K, Naqvi F, Nara Singh BS, Nyberg J, Nociforo C, Obertelli A, Pfützner M, Pietralla N, Podolyák Z, Prochazka A, Ralet D, Reiter P, Rudolph D, Schaffner H, Schirru F, Scruton L, Sohler D, Swaleh T, Taprogge J, Vajta Z, Wadsworth R, Warr N, Weick H, Wendt A, Wieland O, Winfield JS, and Wollersheim HJ

Abstract

A measurement of the reduced transition probability for the excitation of the ground state to the first 2+ state in 104Sn has been performed using relativistic Coulomb excitation at GSI. 104Sn is the lightest isotope in the Sn chain for which this quantity has been measured. The result is a key point in the discussion of the evolution of nuclear structure in the proximity of the doubly magic nucleus 100Sn. The value B(E2; 0+ → 2+) = 0.10(4) e2b2 is significantly lower than earlier results for 106Sn and heavier isotopes. The result is well reproduced by shell model predictions and therefore indicates a robust N = Z = 50 shell closure.

Published
2013
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