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1. The shape of the Tz = +1 nucleus 94Pd and the role of proton-neutron interactions on the structure of its excited states

Author: A. Yaneva, S. Jazrawi, M. Mikołajczuk, M. Górska, P.H. Regan, B. Das, H.M. Albers, S. Alhomaidhi, T. Arici, A. Banerjee, G. Benzoni, B. Cederwall, M.M.R. Chishti, D.D. Dao, T. Davinson, A. Gargano, J. Gerl, O. Hall, N. Hubbard, J. Jolie, I. Kojouharov, A.K. Mistry, F. Nowacki, M. Polettini, M. Rudigier, E. Şahin, H. Schaffner, A. Sharma, M. Armstrong, H.J. Wollersheim, P. Boutachkov, T. Dickel, E. Haettner, H. Heggen, Ch. Hornung, R. Knöbel, D. Kostyleva, N. Kurz, N. Kuzminchuk, I. Mukha, S. Pietri, W.R. Plass, Zs. Podolyák, C. Scheidenberger, Y.K. Tanaka, J. Vesic, H. Weick, U. Ahmed, Ö. Aktas, A. Algora, C. Appleton, J. Benito, A. Blazhev, A. Bracco, A.M. Bruce, M. Brunet, R. Canavan, A. Esmaylzadeh, L.M. Fraile, G. Häfner, K.P. Hucka, P.R. John, D. Kahl, V. Karayonchev, R. Kern, G. Košir, R. Lozeva, P. Napiralla, B.S. Nara Singh, R. Page, C.M. Petrache, N. Pietralla, J.-M. Régis, H. Rösch, P. Ruotsalainen, V. Sanchez-Temble, L. Sexton, R. Shearman, M. Si, V. Werner, J. Wiederhold, K. Wimmer, W. Witt, P. Woods, and G. Zimba
Subjects: γ spectroscopy, Fast-timing γ-ray coincidences, pn interaction, Isovector vs. isoscalar pairing, Shell model, Physics, QC1-999
Abstract: Reduced transition probabilities have been extracted between excited, yrast states in the N=Z+2 nucleus 94Pd. The transitions of interest were observed following decays of the Iπ=14+, Ex=2129-keV isomeric state, which was populated following the projectile fragmentation of a 124Xe primary beam at the GSI Helmholtzzentrum für Schwerionenforschung accelerator facility as part of FAIR Phase-0. Experimental information regarding the reduced E2 transition strengths for the decays of the yrast 8+ and 6+ states was determined following isomer-delayed Eγ1−Eγ2−△T2,1 coincidence method, using the LaBr3(Ce)-based FATIMA fast-timing coincidence gamma-ray array, which allowed direct determination of lifetimes of states in 94Pd using the Generalized Centroid Difference (GCD) method. The experimental value for the half-life of the yrast 8+ state of 755(106) ps results in a reduced transition probability of B(E2:8→+6+) = 205−25+34 e2fm4, which enables a precise verification of shell-model calculations for this unique system, lying directly between the N=Z line and the N=50 neutron shell closure. The determined B(E2) value provides an insight into the purity of (g9/2)n configurations in competition with admixtures from excitations between the (lower) N=3pf and (higher) N=4gds orbitals for the first time. The results indicate weak collectivity expected for near-zero quadrupole deformation and an increasing importance of the T=0 proton-neutron interaction at N=48.
Published: 2024
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2. Collectivity at the prolate-oblate transition: The 21+ lifetime of 190W

Author: E. Şahin, V. Werner, A.K. Mistry, M. Rudigier, K. Nomura, J. Jolie, N. Pietralla, P.H. Regan, G. Ağgez, H.M. Albers, U. Ahmed, Ö. Aktaş, A. Algora, S. Alhomaidhi, C. Appleton, T. Arıcı, M. Armstrong, A. Banerjee, J. Benito, G. Benzoni, A. Blazhev, P. Boutachkov, A.M. Bruce, B. Cederwall, M.M.R. Chishti, M.L. Cortés, F. Crespi, B. Das, T. Davinson, T. Dickel, M. Doncel, A. Ertoprak, A. Esmaylzadeh, L.M. Fraile, E.R. Gamba, J. Gerl, M. Górska, J. Ha, E. Haettner, O. Hall, H. Heggen, C. Hornung, N. Hubbard, S. Jazrawi, P.R. John, C.E. Jones, V. Karayonchev, E. Kazantseva, R. Kern, L. Knafla, I. Kojouharov, P. Koseoglou, G. Kosir, D. Kostyleva, N. Kurz, N. Kuzminchuk, M. Llanos-Expósito, R. Lozeva, D. Mengoni, T.J. Mertzimekis, M. Mikolajczuk, A.I. Morales, I. Mukha, J.R. Murias, B.S. Nara-Singh, S.E.A. Orrigo, J. Pellumaj, S. Pelonis, S. Pietri, S. Pigliapoco, Zs. Podolyák, M. Polettini, K. Rezynkina, H.A. Rösch, H. Schaffner, Ch. Scheidenberger, L. Sexton, P.-A. Söderström, Y.K. Tanaka, J.J. Valiente-Dobón, P. Vasileiou, J. Vasiljević, J. Vesic, H. Weick, J. Wiederhold, A. Yaneva, G. Zhang, J. Zhao, and A. Zyriliou
Subjects: Nuclear structure, γ-ray spectroscopy, Isomer spectroscopy, Shape phase transition, DESPEC, NUSTAR, Physics, QC1-999
Abstract: The neutron-rich rare isotope 190W is discussed as a candidate for a prolate-oblate transitional nucleus with maximum γ-softness. The collectivity of this isotope is assessed for the first time by the measurement of the reduced E2 transition probability of its first 2+ state to the ground state. The experiment employed the FAst TIming Array (FATIMA), comprised of 36 LaBr3(Ce) scintillators, which was part of the DESPEC setup at GSI, Darmstadt. The 41+ and 21+ states of 190W were populated subsequently to the decay of its 127(12) μs isomeric Jπ=10− state. The mean lifetime of the 21+ state was determined to be τ=274(28) ps, which corresponds to a B(E2;21+→01+) value of 95(10) W.u. The results motivated a revision of previous calculations within an energy-density functional-based interacting boson model-2 approach, yielding E2 transition properties and spectroscopic quadrupole moments for tungsten isotopes. From comparison to theory, the new data suggest that 190W is at the transition from prolate to oblate structure along the W isotopic chain, which had previously been discussed as a nuclear shape-phase transition.
Published: 2024
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3. 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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4. On the adsorption and reactivity of element 114, flerovium

Author: A. Yakushev, L. Lens, Ch. E. Düllmann, J. Khuyagbaatar, E. Jäger, J. Krier, J. Runke, H. M. Albers, M. Asai, M. Block, J. Despotopulos, A. Di Nitto, K. Eberhardt, U. Forsberg, P. Golubev, M. Götz, S. Götz, H. Haba, L. Harkness-Brennan, R.-D. Herzberg, F. P. Heßberger, D. Hinde, A. Hübner, D. Judson, B. Kindler, Y. Komori, J. Konki, J.V. Kratz, N. Kurz, M. Laatiaoui, S. Lahiri, B. Lommel, M. Maiti, A. K. Mistry, Ch. Mokry, K. J. Moody, Y. Nagame, J. P. Omtvedt, P. Papadakis, V. Pershina, D. Rudolph, L.G. Samiento, T.K. Sato, M. Schädel, P. Scharrer, B. Schausten, D. A. Shaughnessy, J. Steiner, P. Thörle-Pospiech, A. Toyoshima, N. Trautmann, K. Tsukada, J. Uusitalo, K.-O. Voss, A. Ward, M. Wegrzecki, N. Wiehl, E. Williams, and V. Yakusheva
Subjects: nuclear chemistry, radiochemistry, superheavy elements, element 114, adsorption, recoil separators, Chemistry, QD1-999
Abstract: Flerovium (Fl, element 114) is the heaviest element chemically studied so far. To date, its interaction with gold was investigated in two gas-solid chromatography experiments, which reported two different types of interaction, however, each based on the level of a few registered atoms only. Whereas noble-gas-like properties were suggested from the first experiment, the second one pointed at a volatile-metal-like character. Here, we present further experimental data on adsorption studies of Fl on silicon oxide and gold surfaces, accounting for the inhomogeneous nature of the surface, as it was used in the experiment and analyzed as part of the reported studies. We confirm that Fl is highly volatile and the least reactive member of group 14. Our experimental observations suggest that Fl exhibits lower reactivity towards Au than the volatile metal Hg, but higher reactivity than the noble gas Rn.
Published: 2022
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5. The β-decay of 70Kr into 70Br: Restoration of the pseudo-SU(4) symmetry

Author: A. Vitéz-Sveiczer, A. Algora, A.I. Morales, B. Rubio, G.G. Kiss, P. Sarriguren, P. Van Isacker, G. de Angelis, F. Recchia, S. Nishimura, J. Agramunt, V. Guadilla, A. Montaner-Pizá, S.E.A. Orrigo, A. Horváth, D. Napoli, S. Lenzi, A. Boso, V.H. Phong, J. Wu, P.-A. Söderström, T. Sumikama, H. Suzuki, H. Takeda, D.S. Ahn, H. Baba, P. Doornebal, N. Fukuda, N. Inabe, T. Isobe, T. Kubo, S. Kubono, H. Sakurai, Y. Shimizu, C. Sidong, B. Blank, P. Ascher, M. Gerbaux, T. Goigoux, J. Giovinazzo, S. Grévy, T. Kurtukián Nieto, C. Magron, W. Gelletly, Zs. Dombrádi, Y. Fujita, M. Tanaka, P. Aguilera, F. Molina, J. Eberth, F. Diel, D. Lubos, C. Borcea, E. Ganioglu, D. Nishimura, H. Oikawa, Y. Takei, S. Yagi, W. Korten, G. de France, P. Davies, J. Liu, J. Lee, T. Lokotko, I. Kojouharov, N. Kurz, H. Shaffner, and A. Petrovici
Subjects: Beta decay of 70Kr, pn pairing, GT strength distribution, Pseudo-SU(4) symmetry, QRPA calculations, Physics, QC1-999
Abstract: The β-decay of the even-even nucleus 70Kr with Z=N+2, has been investigated at the Radioactive Ion Beam Factory (RIBF) of the RIKEN Nishina Center using the BigRIPS fragment separator, the ZeroDegree Spectrometer, the WAS3ABI implantation station and the EURICA HPGe cluster array. Fifteen γ-rays associated with the β-decay of 70Kr into 70Br have been identified for the first time, defining ten populated states below Eexc=3300 keV. The half-life of 70Kr was derived with increased precision and found to be t1/2=45.19±0.14 ms. The β-delayed proton emission probability has also been determined as εp=0.545(23)%. An increase in the β-strength to the yrast 1+ state in comparison with the heaviest Z=N+2 system studied so far (62Ge decay) is observed that may indicate increased np correlations in the T=0 channel. The β-decay strength deduced from the results is interpreted in terms of the proton-neutron quasiparticle random-phase approximation (pnQRPA) and also with a schematic model that includes isoscalar and isovector pairing in addition to quadrupole deformation. The application of this last model indicates an approximate realization of pseudo-SU(4) symmetry in this system.
Published: 2022
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6. Unveiling the two-proton halo character of 17Ne: Exclusive measurement of quasi-free proton-knockout reactions

Author: C. Lehr, F. Wamers, F. Aksouh, Yu. Aksyutina, H. Álvarez-Pol, L. Atar, T. Aumann, S. Beceiro-Novo, C.A. Bertulani, K. Boretzky, M.J.G. Borge, C. Caesar, M. Chartier, A. Chatillon, L.V. Chulkov, D. Cortina-Gil, P. Díaz Fernández, H. Emling, O. Ershova, L.M. Fraile, H.O.U. Fynbo, D. Galaviz, H. Geissel, M. Heil, M. Heine, D.H.H. Hoffmann, M. Holl, H.T. Johansson, B. Jonson, C. Karagiannis, O.A. Kiselev, J.V. Kratz, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu.A. Litvinov, B. Löher, K. Mahata, J. Marganiec-Galązka, C. Müntz, T. Nilsson, C. Nociforo, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, K. Riisager, C. Rodriguez-Tajes, D. Rossi, D. Savran, H. Scheit, G. Schrieder, P. Schrock, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, H. Weick, and C. Wimmer
Subjects: Physics, QC1-999
Abstract: The proton drip-line nucleus 17Ne is investigated experimentally in order to determine its two-proton halo character. A fully exclusive measurement of the 17Ne(p,2p)16F→15⁎O+p quasi-free one-proton knockout reaction has been performed at GSI at around 500 MeV/nucleon beam energy. All particles resulting from the scattering process have been detected. The relevant reconstructed quantities are the angles of the two protons scattered in quasi-elastic kinematics, the decay of 16F into 15O (including γ decays from excited states) and a proton, as well as the 15O+p relative-energy spectrum and the 16F momentum distributions. The latter two quantities allow an independent and consistent determination of the fractions of l=0 and l=2 motion of the valence protons in 17Ne. With a resulting relatively small l=0 component of only around 35(3)%, it is concluded that 17Ne exhibits a rather modest halo character only. The quantitative agreement of the two values deduced from the energy spectrum and the momentum distributions supports the theoretical treatment of the calculation of momentum distributions after quasi-free knockout reactions at high energies by taking into account distortions based on the Glauber theory. Moreover, the experimental data allow the separation of valence-proton knockout and knockout from the 15O core. The latter process contributes with 11.8(3.1) mb around 40% to the total proton-knockout cross section of 30.3(2.3) mb, which explains previously reported contradicting conclusions derived from inclusive cross sections.
Published: 2022
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7. Impact of shell evolution on Gamow-Teller β decay from a high-spin long-lived isomer in 127Ag

Author: H. Watanabe, C.X. Yuan, G. Lorusso, S. Nishimura, Z.Y. Xu, T. Sumikama, P.-A. Söderström, P. Doornenbal, F. Browne, G. Gey, H.S. Jung, J. Taprogge, Zs. Vajta, H.K. Wang, J. Wu, A. Yagi, H. Baba, G. Benzoni, K.Y. Chae, F.C.L. Crespi, N. Fukuda, R. Gernhäuser, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G.D. Kim, Y.K. Kim, I. Kojouharov, F.G. Kondev, T. Kubo, N. Kurz, Y.K. Kwon, G.J. Lane, Z. Li, C.-B. Moon, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, D. Nishimura, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, H. Sakurai, H. Schaffner, G.S. Simpson, K. Steiger, H. Suzuki, H. Takeda, A. Wendt, and K. Yoshinaga
Subjects: Shell evolution, Gamow-Teller β decay, Isomer, 127Ag, Radioactive isotope beam, Physics, QC1-999
Abstract: The change of the shell structure in atomic nuclei, so-called “nuclear shell evolution”, occurs due to changes of major configurations through particle-hole excitations inside one nucleus, as well as due to variation of the number of constituent protons or neutrons. We have investigated how the shell evolution affects Gamow-Teller (GT) transitions that dominate the β decay in the region below 132Sn using the newly obtained experimental data on a long-lived isomer in 127Ag. The T1/2=67.5(9) ms isomer has been identified with a spin and parity of (27/2+) at an excitation energy of 1942−20+14 keV, and found to decay via an internal transition of an E3 character, which competes with the dominant β-decay branches towards the high-spin states in 127Cd. The underlying mechanism of a strong GT transition from the 127Ag isomer is discussed in terms of configuration-dependent optimization of the effective single-particle energies in the framework of a shell-model approach.
Published: 2021
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8. First Study on Nihonium (Nh, Element 113) Chemistry at TASCA

Author: A. Yakushev, L. Lens, Ch. E. Düllmann, M. Block, H. Brand, T. Calverley, M. Dasgupta, A. Di Nitto, M. Götz, S. Götz, H. Haba, L. Harkness-Brennan, R-D. Herzberg, F. P. Heßberger, D. Hinde, A. Hübner, E. Jäger, D. Judson, J. Khuyagbaatar, B. Kindler, Y. Komori, J. Konki, J.V. Kratz, J. Krier, N. Kurz, M. Laatiaoui, B. Lommel, Christian Lorenz, M. Maiti, A.K. Mistry, Ch. Mokry, Y. Nagame, P. Papadakis, A. Såmark-Roth, D. Rudolph, J. Runke, L.G. Sarmiento, T.K. Sato, M. Schädel, P. Scharrer, B. Schausten, J. Steiner, P. Thörle-Pospiech, A. Toyoshima, N. Trautmann, J. Uusitalo, A. Ward, M. Wegrzecki, and V. Yakusheva
Subjects: superheavy elements, nihonium, element 113, gas phase chromatography, physical preseparation, TASCA, Chemistry, QD1-999
Abstract: Nihonium (Nh, element 113) and flerovium (Fl, element 114) are the first superheavy elements in which the 7p shell is occupied. High volatility and inertness were predicted for Fl due to the strong relativistic stabilization of the closed 7p1/2 sub-shell, which originates from a large spin-orbit splitting between the 7p1/2 and 7p3/2 orbitals. One unpaired electron in the outermost 7p1/2 sub-shell in Nh is expected to give rise to a higher chemical reactivity. Theoretical predictions of Nh reactivity are discussed, along with results of the first experimental attempts to study Nh chemistry in the gas phase. The experimental observations verify a higher chemical reactivity of Nh atoms compared to its neighbor Fl and call for the development of advanced setups. First tests of a newly developed detection device miniCOMPACT with highly reactive Fr isotopes assure that effective chemical studies of Nh are within reach.
Published: 2021
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9. 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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10. Performance comparison of various electronics systems for fast-timing measurements using the KHALA LaBr3(Ce) detector array

Author: J. Lee, Y.H. Kim, B. Hong, B. Moon, Y. Jang, S. Ahn, S. Bae, K.I. Hahn, J. Park, B. Das, M. Górska, H. Heggen, N. Kurz, and M. Wiebusch
Subjects: Nuclear and High Energy Physics, Instrumentation
Published: 2023

11. 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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12. Quasi-free neutron and proton knockout reactions from light nuclei in a wide neutron-to-proton asymmetry range

Author: M. Holl, V. Panin, H. Alvarez-Pol, L. Atar, T. Aumann, S. Beceiro-Novo, J. Benlliure, C.A. Bertulani, J.M. Boillos, K. Boretzky, M. Caamaño, C. Caesar, E. Casarejos, W. Catford, J. Cederkall, L. Chulkov, D. Cortina-Gil, E. Cravo, I. Dillmann, P. Díaz Fernández, Z. Elekes, J. Enders, L.M. Fraile, D. Galaviz Redondo, R. Gernhäuser, P. Golubev, T. Heftrich, M. Heil, M. Heine, A. Heinz, A. Henriques, H.T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, T. Kröll, N. Kurz, C. Langer, T. Le Bleis, S. Lindberg, J. Machado, E. Nacher, M.A. Najafi, T. Nilsson, C. Nociforo, S. Paschalis, M. Petri, R. Reifarth, G. Ribeiro, C. Rigollet, D.M. Rossi, D. Savran, H. Scheit, H. Simon, O. Sorlin, I. Syndikus, O. Tengblad, Y. Togano, M. Vandebrouck, P. Velho, F. Wamers, H. Weick, C. Wheldon, G.L. Wilson, J.S. Winfield, P. Woods, M. Zhukov, and K. Zuber
Subjects: Physics, QC1-999
Abstract: The quasi-free scattering reactions 11C(p,2p) and 10,11,12C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u at the R3B-LAND setup. The outgoing proton-proton and proton-neutron pairs were detected in coincidence with the reaction fragments in kinematically complete measurements. The efficiency to detect these pairs has been obtained from GEANT4 simulations which were tested using the 12C(p,2p) and 12C(p,pn) reactions. Experimental cross sections and momentum distributions have been obtained and compared to DWIA calculations based on eikonal theory. The new results reported here are combined with previously published cross sections for quasi-free scattering from oxygen and nitrogen isotopes and together they enable a systematic study of the reduction of single-particle strength compared to predictions of the shell model over a wide neutron-to-proton asymmetry range. The combined reduction factors show a weak or no dependence on isospin asymmetry, in contrast to the strong dependency reported in nucleon-removal reactions induced by nuclear targets at lower energies. However, the reduction factors for (p,2p) are found to be 'significantly smaller than for (p,pn) reactions for all investigated nuclei. Keywords: Quasi-free scattering, Inverse kinematics, Shell model, Spectroscopic factors
Published: 2019
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13. First spectroscopy of 61Ti and the transition to the Island of Inversion at N = 40

Author: K. Wimmer, F. Recchia, S.M. Lenzi, S. Riccetto, T. Davinson, A. Estrade, C.J. Griffin, S. Nishimura, F. Nowacki, V. Phong, A. Poves, P.-A. Söderström, O. Aktas, M. Al-Aqeel, T. Ando, H. Baba, S. Bae, S. Choi, P. Doornenbal, J. Ha, L. Harkness-Brennan, T. Isobe, P.R. John, D. Kahl, G. Kiss, I. Kojouharov, N. Kurz, M. Labiche, K. Matsui, S. Momiyama, D.R. Napoli, M. Niikura, C. Nita, Y. Saito, H. Sakurai, H. Schaffner, P. Schrock, C. Stahl, T. Sumikama, V. Werner, W. Witt, and P.J. Woods
Subjects: Physics, QC1-999
Abstract: Isomeric states in 59,61Ti have been populated in the projectile fragmentation of a 345 AMeV 238U beam at the Radioactive Isotope Beam Factory. The decay lifetimes and delayed γ-ray transitions were measured with the EURICA array. Besides the known isomeric state in 59Ti, two isomeric states in 61Ti are observed for the first time. Based on the measured lifetimes, transition multipolarities as well as tentative spins and parities are assigned. Large-scale shell model calculations based on the modified LNPS interaction show that both 59Ti and 61Ti belong to the Island of Inversion at N=40 with ground state configurations dominated by particle-hole excitations to the g9/2 and d5/2 orbits. Keywords: Radioactive beams, Gamma-ray spectroscopy, Isomeric decay, Shell evolution, Island of Inversion
Published: 2019
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14. New isomers in 125Pd79 and 127Pd81: Competing proton and neutron excitations in neutron-rich palladium nuclides towards the N = 82 shell closure

Author: H. Watanabe, H.K. Wang, G. Lorusso, S. Nishimura, Z.Y. Xu, T. Sumikama, P.-A. Söderström, P. Doornenbal, F. Browne, G. Gey, H.S. Jung, J. Taprogge, Zs. Vajta, J. Wu, A. Yagi, H. Baba, G. Benzoni, K.Y. Chae, F.C.L. Crespi, N. Fukuda, R. Gernhäuser, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G.D. Kim, Y.K. Kim, I. Kojouharov, F.G. Kondev, T. Kubo, N. Kurz, Y.K. Kwon, G.J. Lane, Z. Li, C.-B. Moon, A. Montaner-Pizá, K. Moschner, F. Naqvi, M. Niikura, H. Nishibata, D. Nishimura, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, H. Sakurai, H. Schaffner, G.S. Simpson, K. Steiger, Y. Sun, H. Suzuki, H. Takeda, A. Wendt, and K. Yoshinaga
Subjects: Physics, QC1-999
Abstract: The neutron-rich isotopes of palladium have attracted considerable interest in terms of the evolution of the N=82 neutron shell closure and its influence on the r-process nucleosynthesis. In this Letter, we present the first spectroscopic information on the excited states in 125Pd79 and 127Pd81 studied using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity 238U beam at the RIBF facility. New isomeric states with half-lives of 144(4) ns and 39(6) μs have been assigned spins and parities of (23/2+) and (19/2+) in 125Pd and 127Pd, respectively. The observed level properties are compared to a shell-model calculation, suggesting the competition between proton excitations and neutron excitations in the proton-hole and neutron-hole systems in the vicinity of the doubly magic nucleus 132Sn.
Published: 2019
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15. Low-lying electric dipole γ-continuum for the unstable 62,64Fe nuclei: Strength evolution with neutron number

Author: R. Avigo, O. Wieland, A. Bracco, F. Camera, F. Ameil, T. Arici, A. Ataç, D. Barrientos, D. Bazzacco, P. Bednarczyk, G. Benzoni, B. Birkenbach, N. Blasi, H.C. Boston, S. Bottoni, S. Brambilla, B. Bruyneel, M. Ciemała, E. Clément, M.L. Cortés, F.C.L. Crespi, D.M. Cullen, D. Curien, F. Didierjean, C. Domingo-Pardo, G. Duchêne, J. Eberth, A. Görgen, A. Gadea, J. Gerl, N. Goel, P. Golubev, V. González, M. Górska, A. Gottardo, E. Gregor, G. Guastalla, T. Habermann, L.J. Harkness-Brennan, A. Jungclaus, M. Kmiecik, I. Kojouharov, W. Korten, N. Kurz, M. Labiche, N. Lalović, S. Leoni, M. Lettmann, A. Maj, R. Menegazzo, D. Mengoni, E. Merchan, B. Million, A.I. Morales, D.R. Napoli, C. Nociforo, J. Nyberg, N. Pietralla, S. Pietri, Zs. Podolyák, V.Yu. Ponomarev, A. Pullia, B. Quintana, G. Rainovski, D. Ralet, F. Recchia, M. Reese, P. Regan, P. Reiter, S. Riboldi, D. Rudolph, M.D. Salsac, E. Sanchis, L.G. Sarmiento, H. Schaffner, J. Simpson, O. Stezowski, J.J. Valiente-Dobón, and H.J. Wollersheim
Subjects: 64Fe, 62Fe, Nuclear structure, Dipole excitation around neutron threshold, Physics, QC1-999
Abstract: The γ-ray emission from the nuclei 62,64Fe following Coulomb excitation at bombarding energy of 400-440 AMeV was measured with special focus on E1 transitions in the energy region 4-8 MeV. The unstable neutron-rich nuclei 62,64Fe were produced at the FAIR-GSI laboratories and selected with the FRS spectrometer. The γ decay was detected with AGATA. From the measured γ-ray spectra the summed E1 strength is extracted and compared to microscopic quasi-particle phonon model calculations. The trend of the E1 strength with increasing neutron number is found to be fairly well reproduced with calculations that assume a rather complex structure of the 1− states (three-phonon states) inducing a strong fragmentation of the E1 nuclear response below the neutron binding energy.
Published: 2020
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16. Probing the Z = 6 spin-orbit shell gap with (p,2p) quasi-free scattering reactions

Author: I. Syndikus, M. Petri, A.O. Macchiavelli, S. Paschalis, C.A. Bertulani, T. Aumann, H. Alvarez-Pol, L. Atar, S. Beceiro-Novo, J. Benlliure, J.M. Boillos, K. Boretzky, M.J.G. Borge, B.A. Brown, M. Caamaño, C. Caesar, E. Casarejos, W. Catford, J. Cederkall, S. Chakraborty, L.V. Chulkov, D. Cortina-Gil, E. Cravo, R. Crespo, U. Datta Pramanik, I. Dillmann, P. Díaz Fernández, Z. Elekes, J. Enders, F. Farinon, L.M. Fraile, D. Galaviz, H. Geissel, R. Gernhäuser, P. Golubev, K. Göbel, M. Heil, M. Heine, A. Heinz, A. Henriques, M. Holl, H.T. Johansson, B. Jonson, N. Kalantar-Nayestanaki, R. Kanungo, A. Kelic-Heil, T. Kröll, N. Kurz, C. Langer, T. Le Bleis, J. Machado, J. Marganiec-Gałązka, E. Nacher, T. Nilsson, C. Nociforo, V. Panin, A. Perea, S.B. Pietri, R. Plag, A. Rahaman, R. Reifarth, A. Revel, G. Ribeiro, C. Rigollet, D.M. Rossi, D. Savran, H. Scheit, H. Simon, O. Sorlin, O. Tengblad, Y. Togano, M. Vandebrouck, V. Volkov, F. Wamers, C. Wheldon, G.L. Wilson, J.S. Winfield, H. Weick, P. Woods, D. Yakorev, M. Zhukov, A. Zilges, and K. Zuber
Subjects: Quasi-free scattering reactions, Magic numbers, Spin-orbit splitting, Tensor force, Shell evolution, Exotic nuclei, Physics, QC1-999
Abstract: The evolution of the traditional nuclear magic numbers away from the valley of stability is an active field of research. Experimental efforts focus on providing key spectroscopic information that will shed light into the structure of exotic nuclei and understanding the driving mechanism behind the shell evolution. In this work, we investigate the Z=6 spin-orbit shell gap towards the neutron dripline. To do so, we employed NA(p,2p)CA−1 quasi-free scattering reactions to measure the proton component of the 21+ state of 16,18,20C. The experimental findings support the notion of a moderate reduction of the proton 1p1/2−1p3/2 spin-orbit splitting, at variance to recent claims for a prevalent Z=6 magic number towards the neutron dripline.
Published: 2020
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17. Study of non-fusion products in the Ti50+Cf249 reaction

Author: A. Di Nitto, J. Khuyagbaatar, D. Ackermann, L.-L. Andersson, E. Badura, M. Block, H. Brand, I. Conrad, D.M. Cox, Ch.E. Düllmann, J. Dvorak, K. Eberhardt, P.A. Ellison, N.E. Esker, J. Even, C. Fahlander, U. Forsberg, J.M. Gates, P. Golubev, O. Gothe, K.E. Gregorich, W. Hartmann, R.D. Herzberg, F.P. Heßberger, J. Hoffmann, R. Hollinger, A. Hübner, E. Jäger, B. Kindler, S. Klein, I. Kojouharov, J.V. Kratz, J. Krier, N. Kurz, S. Lahiri, B. Lommel, M. Maiti, R. Mändl, E. Merchán, S. Minami, A.K. Mistry, C. Mokry, H. Nitsche, J.P. Omtvedt, G.K. Pang, D. Renisch, D. Rudolph, J. Runke, L.G. Sarmiento, M. Schädel, H. Schaffner, B. Schausten, A. Semchenkov, J. Steiner, P. Thörle-Pospiech, N. Trautmann, A. Türler, J. Uusitalo, D. Ward, M. Wegrzecki, P. Wieczorek, N. Wiehl, A. Yakushev, and V. Yakusheva
Subjects: Physics, QC1-999
Abstract: The isotopic distribution of nuclei produced in the 50Ti + 249Cf reaction has been studied at the gas-filled recoil separator TASCA at GSI Darmstadt, which separates ions according to differences in magnetic rigidity. The bombardment was performed at an energy around the Bass barrier and with the TASCA magnetic fields set for collecting fusion-evaporation reaction products. Fifty-three isotopes located “north-east” of 208Pb were identified as recoiling products formed in non-fusion channels of the reaction. These recoils were implanted with energies in two distinct ranges; besides one with higher energy, a significant low-energy contribution was identified. The latter observation was not expected to occur according to kinematics of the known types of reactions, namely quasi-elastic, multi-nucleon transfer, deep-inelastic collisions or quasifission. The present observations are discussed within the framework of two-body kinematics passing through the formation of a composite system. Keywords: Production of radioactive nuclei, α decay, Multi-nucleon transfer reactions, Quasifission
Published: 2018
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18. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Author: G.X. Zhang, H. Watanabe, G.D. Dracoulis, F.G. Kondev, G.J. Lane, P.H. Regan, P.-A. Söderström, P.M. Walker, K. Yoshida, H. Kanaoka, Z. Korkulu, P.S. Lee, J.J. Liu, S. Nishimura, J. Wu, A. Yagi, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, M.P. Carpenter, R.J. Carroll, K.Y. Chae, C.J. Chiara, Zs. Dombradi, P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, T. Lauritsen, C.S. Lee, E.J. Lee, C.J. Lister, G. Lorusso, G. Lotay, E.A. McCutchan, C.-B. Moon, I. Nishizuka, C.R. Nita, A. Odahara, Z. Patel, V.H. Phong, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, D. Seweryniak, C.M. Shand, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dóbon, Z.Y. Xu, and S. Zhu
Subjects: Physics, QC1-999
Abstract: The neutron-rich dysprosium isotopes 168Dy102 and 169Dy103 have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For 168Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched 170Er target performed at Argonne National Laboratory. This isomer is assigned Jπ=Kπ=(4−) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N=102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In 169Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ=(1/2−) isomeric state at 166 keV to the Kπ=(5/2−) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N=103 isotone 173Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.
Published: 2019
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19. Is seniority a partial dynamic symmetry in the first νg9/2 shell?

Author: A.I. Morales, G. Benzoni, H. Watanabe, G. de Angelis, S. Nishimura, L. Coraggio, A. Gargano, N. Itaco, T. Otsuka, Y. Tsunoda, P. Van Isacker, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, J.J. Valiente-Dobón, J. Wu, Z.Y. Xu, A. Yagi, R. Yokoyama, H. Baba, R. Avigo, F.L. Bello Garrote, N. Blasi, A. Bracco, A.M. Bruce, F. Camera, S. Ceruti, F.C.L. Crespi, M.-C. Delattre, Zs. Dombradi, A. Gottardo, T. Isobe, I. Kojouharov, N. Kurz, I. Kuti, S. Lalkovski, K. Matsui, B. Melon, D. Mengoni, T. Miyazaki, V. Modamio-Hoybjor, S. Momiyama, D.R. Napoli, M. Niikura, R. Orlandi, Zs. Podolyák, P.H. Regan, H. Sakurai, E. Sahin, D. Sohler, H. Schaffner, R. Taniuchi, J. Taprogge, Zs. Vajta, O. Wieland, and M. Yalcinkaya
Subjects: Physics, QC1-999
Abstract: The low-lying structures of the midshell νg9/2 Ni isotopes 72Ni and 74Ni have been investigated at the RIBF facility in RIKEN within the EURICA collaboration. Previously unobserved low-lying states were accessed for the first time following β decay of the mother nuclei 72Co and 74Co. As a result, we provide a complete picture in terms of the seniority scheme up to the first (8+) levels for both nuclei. The experimental results are compared to shell-model calculations in order to define to what extent the seniority quantum number is preserved in the first neutron g9/2 shell. We find that the disappearance of the seniority isomerism in the (81+) states can be explained by a lowering of the seniority-four (6+) levels as predicted years ago. For 74Ni, the internal de-excitation pattern of the newly observed (62+) state supports a restoration of the normal seniority ordering up to spin J=4. This property, unexplained by the shell-model calculations, is in agreement with a dominance of the single-particle spherical regime near 78Ni.
Published: 2018
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20. First spectroscopic study of odd-odd Cu78

Author: L. G. Pedersen, E. Sahin, A. Görgen, F. L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A. M. Bruce, S. Ceruti, F. C. L. Crespi, R. Daido, G. de Angelis, M.-C. Delattre, Zs. Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P. R. John, H. S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A. I. Morales, P. Morfouace, D. R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P.-A. Söderström, D. Sohler, I. G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J. J. Valiente-Dobón, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, and K. Yoshinaga
Published: 2023

21. Observation of a γ-decaying millisecond isomeric state in 128Cd80

Author: A. Jungclaus, H. Grawe, S. Nishimura, P. Doornenbal, G. Lorusso, G.S. Simpson, P.-A. Söderström, T. Sumikama, J. Taprogge, Z.Y. Xu, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, G.D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y.K. Kwon, Z. Li, H. Sakurai, H. Schaffner, Y. Shimizu, K. Steiger, H. Suzuki, H. Takeda, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K.Y. Chae, L. Coraggio, J.-M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, N. Itaco, F.G. Kondev, T. Kröll, G.J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, and A. Wendt
Subjects: Isomeric decays, Shell model calculations, Transition strengths, Physics, QC1-999
Abstract: A new high-spin isomer in the neutron-rich nucleus 128Cd was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. A half-life of T1/2=6.3(8) ms was measured for the new state which was tentatively assigned a spin/parity of (15−). The experimental results are compared to shell model calculations performed using state-of-the-art realistic effective interactions and to the neighbouring nucleus 129Cd. In the present experiment no evidence was found for the decay of a 18+ E6 spin-trap isomer, based on the complete alignment of the two-neutron and two-proton holes in the 0h11/2 and the 0g9/2 orbit, respectively, which is predicted to exist by the shell model.
Published: 2017
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22. The role of core excitations in the structure and decay of the 16+ spin-gap isomer in 96Cd

Author: P.J. Davies, H. Grawe, K. Moschner, A. Blazhev, R. Wadsworth, P. Boutachkov, F. Ameil, A. Yagi, H. Baba, T. Bäck, M. Dewald, P. Doornenbal, T. Faestermann, A. Gengelbach, J. Gerl, R. Gernhäeuser, S. Go, M. Górska, E. Gregor, T. Isobe, D.G. Jenkins, H. Hotaka, J. Jolie, I. Kojouharov, N. Kurz, M. Lewitowicz, G. Lorusso, L. Maier, E. Merchan, F. Naqvi, H. Nishibata, D. Nishimura, S. Nishimura, F. Nowacki, N. Pietralla, H. Schaffner, P.-A. Söderström, H.S. Jung, K. Steiger, T. Sumikama, J. Taprogge, P. Thöle, N. Warr, H. Watanabe, V. Werner, Z.Y. Xu, K. Yoshinaga, and Y. Zhu
Subjects: β-decay, βp-decay, γ-ray spectroscopy, Half-life, Shell-model, WKB, Physics, QC1-999
Abstract: The first evidence for β-delayed proton emission from the 16+ spin gap isomer in 96Cd is presented. The data were obtained from the Rare Isotope Beam Factory, at the RIKEN Nishina Center, using the BigRIPS spectrometer and the EURICA decay station. βp branching ratios for the ground state and 16+ isomer have been extracted along with more precise lifetimes for these states and the lifetime for the ground state decay of 95Cd. Large scale shell model (LSSM) calculations have been performed and WKB estimates made for ℓ=0,2,4 proton emission from three resonance-like states in 96Ag, that are populated by the β decay of the isomer, and the results compared to the new data. The calculations suggest that ℓ=2 proton emission from the resonance states, which reside ∼5 MeV above the proton separation energy, dominates the proton decay. The results highlight the importance of core-excited wavefunction components for the 16+ state.
Published: 2017
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23. Type II shell evolution in A=70 isobars from the N≥40 island of inversion

Author: A.I. Morales, G. Benzoni, H. Watanabe, Y. Tsunoda, T. Otsuka, S. Nishimura, F. Browne, R. Daido, P. Doornenbal, Y. Fang, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P.-A. Söderström, T. Sumikama, J. Wu, Z.Y. Xu, A. Yagi, R. Yokoyama, H. Baba, R. Avigo, F.L. Bello Garrote, N. Blasi, A. Bracco, F. Camera, S. Ceruti, F.C.L. Crespi, G. de Angelis, M.-C. Delattre, Zs. Dombradi, A. Gottardo, T. Isobe, I. Kojouharov, N. Kurz, I. Kuti, K. Matsui, B. Melon, D. Mengoni, T. Miyazaki, V. Modamio-Hoybjor, S. Momiyama, D.R. Napoli, M. Niikura, R. Orlandi, H. Sakurai, E. Sahin, D. Sohler, H. Schaffner, R. Taniuchi, J. Taprogge, Zs. Vajta, J.J. Valiente-Dobón, O. Wieland, and M. Yalcinkaya
Subjects: Physics, QC1-999
Abstract: The level structures of 70Co and 70Ni, populated from the β decay of 70Fe, have been investigated using β-delayed γ-ray spectroscopy following in-flight fission of a 238U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2 orbitals. The strong population of a (1+) state at 274 keV in 70Co is at variance with the expected excitation energy of ∼1 MeV from near spherical single-particle estimates. This observation indicates a dominance of prolate-deformed intruder configurations in the low-lying levels, which coexist with the normal near spherical states. It is shown that the β decay of the neutron-rich A=70 isobars from the new island of inversion to the Z=28 closed-shell regime progresses in accordance with a newly reported type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps.
Published: 2017
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24. K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Author: P.-A. Söderström, P.M. Walker, J. Wu, H.L. Liu, P.H. Regan, H. Watanabe, P. Doornenbal, Z. Korkulu, P. Lee, J.J. Liu, G. Lorusso, S. Nishimura, V.H. Phong, T. Sumikama, F.R. Xu, A. Yagi, G.X. Zhang, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, R.J. Carroll, K.Y. Chae, Zs. Dombradi, A. Estrade, N. Fukuda, C.J. Griffin, E. Ideguchi, N. Inabe, T. Isobe, H. Kanaoka, S. Kanaya, I. Kojouharov, F.G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G.J. Lane, E.J. Lee, C.S. Lee, G. Lotay, C.-B. Moon, I. Nishizuka, C.R. Niţă, A. Odahara, Z. Patel, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, C.M. Shand, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dòbon, and Z.Y. Xu
Subjects: Physics, QC1-999
Abstract: A detailed study of the structure of the doubly mid-shell nucleus Dy104166170 has been carried out, following isomeric and β decay. We have measured the yrast band up to the spin-parity Jπ=6+ state, the K=2 γ-vibration band up to the 5+ state, a low-lying negative-parity band based on a 2− state that could be a candidate for the lowest energy octupole vibration state within this nucleus, and a candidate for the Kπ=6+ two quasi-particle isomer. This state was determined to have an excitation energy of 1643.91(23) keV and a half life of 0.99(4) μs, with a reduced hindrance for its decay to the ground-state band an order of magnitude lower than predicted by NpNn systematics. This is interpreted as being due to γ-vibrational mixing from a near degeneracy of the isomer and the 6+ state of the γ band. Furthermore, the parent nucleus 170Tb has been determined to have a half-life of 0.91(−13+18) s with a possible spin-parity of 2−. Keywords: K isomer, Dysprosium, Mid-shell, γ-Ray spectroscopy
Published: 2016
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25. Spectroscopy along flerovium decay chains. II. Fine structure in odd- A Fl289

Author: D. M. Cox, A. Såmark-Roth, D. Rudolph, L. G. Sarmiento, R. M. Clark, J. L. Egido, P. Golubev, J. Heery, A. Yakushev, S. Åberg, H. M. Albers, M. Albertsson, M. Block, H. Brand, T. Calverley, R. Cantemir, B. G. Carlsson, Ch. E. Düllmann, J. Eberth, C. Fahlander, U. Forsberg, J. M. Gates, F. Giacoppo, M. Götz, S. Götz, R.-D. Herzberg, Y. Hrabar, E. Jäger, D. Judson, J. Khuyagbaatar, B. Kindler, I. Kojouharov, J. V. Kratz, J. Krier, N. Kurz, L. Lens, J. Ljungberg, B. Lommel, J. Louko, C.-C. Meyer, A. Mistry, C. Mokry, P. Papadakis, E. Parr, J. L. Pore, I. Ragnarsson, J. Runke, M. Schädel, H. Schaffner, B. Schausten, D. A. Shaughnessy, P. Thörle-Pospiech, N. Trautmann, and J. Uusitalo
Published: 2023

26. In-beam test results of the Super-FRS GEM-TPC detector prototype with relativistic uranium ion beam

Author: M. Luoma, F. García, J. Äystö, T. Blatz, D. Chokheli, H. Flemming, K. Götzen, T. Grahn, A. Jokinen, C. Karagiannis, N. Kurz, S. Löchner, C. Nociforo, S. Rinta-Antila, C.J. Schmidt, H. Simon, R. Turpeinen, B. Voss, P. Wieczorek, M. Winkler, and Helsinki Institute of Physics
Subjects: clusterization, Nuclear and High Energy Physics, ilmaisimet, super-FRS, tutkimuslaitteet, tracking, ydinfysiikka, 114 Physical sciences, GEM-TPC, Instrumentation, FAIR
Abstract: As an essential part of the Super-FRS particle identification, the GEM-TPC detector in a twin field-cage configuration will provide position information at up to 1 MHz counting rate with a spatial resolution < 1 mm and with tracking efficiency >95 %. This detector is designed to provide particle-beam tracking information of projectiles ranging from protons to uranium. The performance of the GEM-TPC detector in a single field-cage configuration and newly integrated AWAGS readout electronics with a differential output was studied at the FRS for the response to the uranium beam at 850 MeV/u with intensity up to 1000 ions/spill. The result shows that a clusterization algorithm developed for this analysis works properly. The spatial resolution of 0.74–0.81 mm, a detection efficiency >99 %, and a tracking efficiency >96 % were found. This work describes the methodology used to achieve such results in detail. peerReviewed
Published: 2023

27. Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

Author: H. Watanabe, G.X. Zhang, K. Yoshida, P.M. Walker, J.J. Liu, J. Wu, P.H. Regan, P.-A. Söderström, H. Kanaoka, Z. Korkulu, P.S. Lee, S. Nishimura, A. Yagi, D.S. Ahn, T. Alharbi, H. Baba, F. Browne, A.M. Bruce, R.J. Carroll, K.Y. Chae, Zs. Dombradi, P. Doornenbal, A. Estrade, N. Fukuda, C. Griffin, E. Ideguchi, N. Inabe, T. Isobe, S. Kanaya, I. Kojouharov, F.G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G.J. Lane, C.S. Lee, E.J. Lee, G. Lorusso, G. Lotay, C.-B. Moon, I. Nishizuka, C.R. Nita, A. Odahara, Z. Patel, V.H. Phong, Zs. Podolyák, O.J. Roberts, H. Sakurai, H. Schaffner, C.M. Shand, Y. Shimizu, T. Sumikama, H. Suzuki, H. Takeda, S. Terashima, Zs. Vajta, J.J. Valiente-Dóbon, and Z.Y. Xu
Subjects: 172Dy, K isomer, Decay spectroscopy, Axial symmetry, γ vibration, Physics, QC1-999
Abstract: The level structure of 172Dy has been investigated for the first time by means of decay spectroscopy following in-flight fission of a 238U beam. A long-lived isomeric state with T1/2=0.71(5) s and Kπ=8− has been identified at 1278 keV, which decays to the ground-state and γ-vibrational bands through hindered electromagnetic transitions, as well as to the daughter nucleus 172Ho via allowed β decays. The robust nature of the Kπ=8− isomer and the ground-state rotational band reveals an axially-symmetric structure for this nucleus. Meanwhile, the γ-vibrational levels have been identified at unusually low excitation energy compared to the neighboring well-deformed nuclei, indicating the significance of the microscopic effect on the non-axial collectivity in this doubly mid-shell region. The underlying mechanism of enhanced γ vibration is discussed in comparison with the deformed Quasiparticle Random-Phase Approximation based on a Skyrme energy-density functional.
Published: 2016
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28. Coulomb and nuclear excitations of narrow resonances in 17Ne

Author: J. Marganiec, F. Wamers, F. Aksouh, Yu. Aksyutina, H. Álvarez-Pol, T. Aumann, S. Beceiro-Novo, C.A. Bertulani, K. Boretzky, M.J.G. Borge, M. Chartier, A. Chatillon, L.V. Chulkov, D. Cortina-Gil, H. Emling, O. Ershova, L.M. Fraile, H.O.U. Fynbo, D. Galaviz, H. Geissel, M. Heil, D.H.H. Hoffmann, J. Hoffmann, H.T. Johansson, B. Jonson, C. Karagiannis, O.A. Kiselev, J.V. Kratz, R. Kulessa, N. Kurz, C. Langer, M. Lantz, T. Le Bleis, R. Lemmon, Yu.A. Litvinov, K. Mahata, C. Müntz, T. Nilsson, C. Nociforo, G. Nyman, W. Ott, V. Panin, S. Paschalis, A. Perea, R. Plag, R. Reifarth, A. Richter, C. Rodriguez-Tajes, D. Rossi, K. Riisager, D. Savran, G. Schrieder, H. Simon, J. Stroth, K. Sümmerer, O. Tengblad, S. Typel, H. Weick, M. Wiescher, and C. Wimmer
Subjects: Physics, QC1-999
Abstract: New experimental data for dissociation of relativistic 17Ne projectiles incident on targets of lead, carbon, and polyethylene targets at GSI are presented. Special attention is paid to the excitation and decay of narrow resonant states in 17Ne. Distributions of internal energy in the O15+p+p three-body system have been determined together with angular and partial-energy correlations between the decay products in different energy regions. The analysis was done using existing experimental data on 17Ne and its mirror nucleus 17N. The isobaric multiplet mass equation is used for assignment of observed resonances and their spins and parities. A combination of data from the heavy and light targets yielded cross sections and transition probabilities for the Coulomb excitations of the narrow resonant states. The resulting transition probabilities provide information relevant for a better understanding of the 17Ne structure.
Published: 2016
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29. Decay spectroscopy of 160Sm: The lightest four-quasiparticle K isomer

Author: Z. Patel, Zs. Podolyák, P.M. Walker, P.H. Regan, P.-A. Söderström, H. Watanabe, E. Ideguchi, G.S. Simpson, S. Nishimura, F. Browne, P. Doornenbal, G. Lorusso, S. Rice, L. Sinclair, T. Sumikama, J. Wu, Z.Y. Xu, N. Aoi, H. Baba, F.L. Bello Garrote, G. Benzoni, R. Daido, Zs. Dombrádi, Y. Fang, N. Fukuda, G. Gey, S. Go, A. Gottardo, N. Inabe, T. Isobe, D. Kameda, K. Kobayashi, M. Kobayashi, T. Komatsubara, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, H.L. Liu, M. Matsushita, S. Michimasa, C.-B. Moon, H. Nishibata, I. Nishizuka, A. Odahara, E. Şahin, H. Sakurai, H. Schaffner, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, Zs. Vajta, F.R. Xu, A. Yagi, and R. Yokoyama
Subjects: Physics, QC1-999
Abstract: The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2π⊗2ν π52−[532], π52+[413], ν52−[523], ν72+[633] configuration. The half-life of this (11+) state is measured to be 1.8(4) μs. The (11+) isomer decays into a rotational band structure, based on a (6−) ν52−[523]⊗ν72+[633] bandhead, consistent with the gK−gR values. This decays to a (5−) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.
Published: 2016
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30. Lifetime measurements of the first 2+ states in 104,106Zr: Evolution of ground-state deformations

Author: F. Browne, A.M. Bruce, T. Sumikama, I. Nishizuka, S. Nishimura, P. Doornenbal, G. Lorusso, P.-A. Söderström, H. Watanabe, R. Daido, Z. Patel, S. Rice, L. Sinclair, J. Wu, Z.Y. Xu, A. Yagi, H. Baba, N. Chiga, R. Carroll, F. Didierjean, Y. Fang, N. Fukuda, G. Gey, E. Ideguchi, N. Inabe, T. Isobe, D. Kameda, I. Kojouharov, N. Kurz, T. Kubo, S. Lalkovski, Z. Li, R. Lozeva, H. Nishibata, A. Odahara, Zs. Podolyák, P.H. Regan, O.J. Roberts, H. Sakurai, H. Schaffner, G.S. Simpson, H. Suzuki, H. Takeda, M. Tanaka, J. Taprogge, V. Werner, and O. Wieland
Subjects: Physics, QC1-999
Abstract: The first fast-timing measurements from nuclides produced via the in-flight fission mechanism are reported. The lifetimes of the first 2+ states in 104,106Zr nuclei have been measured via β-delayed γ-ray timing of stopped radioactive isotope beams. An improved precision for the lifetime of the 21+ state in 104Zr was obtained, τ(21+)=2.90−20+25 ns, as well as a first measurement of the 21+ state in 106Zr, τ(21+)=2.60−15+20 ns, with corresponding reduced transition probabilities of B(E2;21+→0g.s.+)=0.39(2) e2b2 and 0.31(1) e2b2, respectively. Comparisons of the extracted ground-state deformations, β2=0.39(1) (104Zr) and β2=0.36(1) (106Zr) with model calculations indicate a persistence of prolate deformation. The data show that 104Zr is the most deformed of the neutron-rich Zr isotopes measured so far.
Published: 2015
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31. Hypernuclear production cross section in the reaction of 6Li + 12C at 2A GeV

Author: C. Rappold, T.R. Saito, O. Bertini, S. Bianchin, V. Bozkurt, E. Kim, M. Kavatsyuk, Y. Ma, F. Maas, S. Minami, D. Nakajima, B. Özel-Tashenov, K. Yoshida, P. Achenbach, S. Ajimura, T. Aumann, C. Ayerbe Gayoso, H.C. Bhang, C. Caesar, S. Erturk, T. Fukuda, B. Göküzüm, E. Guliev, J. Hoffmann, G. Ickert, Z.S. Ketenci, D. Khaneft, M. Kim, S. Kim, K. Koch, N. Kurz, A. Le Fèvre, Y. Mizoi, L. Nungesser, W. Ott, J. Pochodzalla, A. Sakaguchi, C.J. Schmidt, M. Sekimoto, H. Simon, T. Takahashi, G.J. Tambave, H. Tamura, W. Trautmann, S. Voltz, and C.J. Yoon
Subjects: Hypernuclei, Production cross section, Yield ratio, Relativistic energy, Heavy ion collision, Physics, QC1-999
Abstract: Hypernuclear production cross sections have been deduced for the first time with induced reaction of heavy ion beam on fixed target and by means of the invariant mass method by the HypHI Collaboration exploiting the reaction of 6Li + 12C at 2A GeV or sNN=2.70 GeV. A production cross section of 3.9±1.4 μb for 3ΛH and of 3.1±1.0 μb for 4ΛH respectively in the projectile rapidity region was inferred as well as the total production cross section of the Λ hyperon was measured and found to be equal to 1.7±0.8 mb. A global fit based on a Bayesian approach was performed in order to include and propagate statistical and systematic uncertainties. Production ratios of 3ΛH/4ΛH, 3ΛH/Λ and 4ΛH/Λ were included in the inference procedure. The strangeness population factors S3 and S4 of 3ΛH and 4ΛH respectively were extracted. In addition, the multiplicities of the Λ hyperon, 3ΛH, and 4ΛH together with the rapidity and transversal momentum density distributions of the observed hypernuclei were extracted and reported.
Published: 2015
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32. Influence of proton and neutron deformed shells on the asymmetric fission of thorium isotopes

Author: A. Chatillon, J. Taïeb, A. Heinz, H. Alvarez-Pol, L. Audouin, Y. Ayyad, G. Bélier, J. Benlliure, G. Boutoux, M. Caamaño, E. Casarejos, D. Cortina-Gil, A. Ebran, F. Farget, B. Fernández-Domínguez, T. Gorbinet, L. Grente, H. T. Johansson, B. Jurado, A. Kelić-Heil, N. Kurz, B. Laurent, J.-F. Martin, C. Nociforo, C. Paradela, E. Pellereau, S. Pietri, A. Prochazka, J. L. Rodríguez-Sánchez, D. Rossi, H. Simon, L. Tassan-Got, J. Vargas, B. Voss, H. Weick, Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Université Paris-Saclay, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), 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), Laboratoire de Physique des Deux Infinis Bordeaux (LP2I - Bordeaux), and Université de Bordeaux (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract: International audience; Mean values of the number of protons and neutrons of the primary fission fragments at scission are determined for the asymmetric fission of 16 fissioning isotopes, from Ac219 up to Np238. Our results confirm that the main asymmetric fission mode around the heavier uranium isotopes is indeed characterized by an average atomic number around 〈ZH〉=54 in the heavy fission fragments. However, they also unambiguously show a stabilization effect in the light fission fragments around 〈NL〉=52–54 in the neutron-deficient thorium and actinium isotopes. This is a clear signature that these deformed proton and neutron shell closures around 54 play a major role in the nuclear fission process. The evolution along the thorium chain shows that the neutron shell appears to be dominant in the asymmetric fission of the lighter thorium isotopes, in contrast to the heavier thorium isotopes for which the stabilization originates from the proton shell.
Published: 2022

33. Identification of a millisecond isomeric state in Cd81129 via the detection of internal conversion and Compton electrons

Author: J. Taprogge, A. Jungclaus, H. Grawe, S. Nishimura, Z.Y. Xu, P. Doornenbal, G. Lorusso, E. Nácher, G.S. Simpson, P.-A. Söderström, T. Sumikama, H. Baba, F. Browne, N. Fukuda, R. Gernhäuser, G. Gey, N. Inabe, T. Isobe, H.S. Jung, D. Kameda, G.D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, Y.K. Kwon, Z. Li, H. Sakurai, H. Schaffner, K. Steiger, H. Suzuki, H. Takeda, Zs. Vajta, H. Watanabe, J. Wu, A. Yagi, K. Yoshinaga, G. Benzoni, S. Bönig, K.Y. Chae, L. Coraggio, A. Covello, J.-M. Daugas, F. Drouet, A. Gadea, A. Gargano, S. Ilieva, F.G. Kondev, T. Kröll, G.J. Lane, A. Montaner-Pizá, K. Moschner, D. Mücher, F. Naqvi, M. Niikura, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, Zs. Podolyák, and A. Wendt
Subjects: Physics, QC1-999
Abstract: The decay of an isomeric state in the neutron-rich nucleus 129Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ-rays and internal conversion electrons, a multipolarity of E3 was tentatively assigned to the isomeric transition. A half-life of T1/2=3.6(2) ms was determined for the new state which was assigned a spin of (21/2+), based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions. Keywords: Isomeric decays, Transition strengths, Shell model calculations
Published: 2014
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34. Experimental Level Scheme of $^{78}$Cu

Author: L.G. Pedersen, E. Sahin, A. Görgen, F.L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A.M. Bruce, S. Ceruti, F.C.L. Crespi, R. Daido, G. de Angelis, M.-C. Delattre, Zs. Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P.R. John, H.S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A.I. Morales, P. Morfouace, D.R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P.-A. Söderström, D. Sohler, I.G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J.J. Valiente-Dobón, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, and K. Yoshinaga
Subjects: General Physics and Astronomy
Published: 2023

35. Fission-fragment yields measured in Coulomb-induced fission of 234,235,236,238U and 237,238Np with the R3B/SOFIA setup

Author: A. Chatillon, G. Boutoux, T. Gorbinet, L. Grente, J.-F. Martin, E. Pellereau, J. Taieb, H. Alvarez-Pol, L. Audouin, Y. Ayyad, G. Bélier, J. Benlliure, M. Caamaño, E. Casarejos, D. Cortina-Gil, A. Ebran, F. Farget, B. Fernández-Domínguez, A. Heinz, H. T. Johansson, B. Jurado, A. Kelić-Heil, N. Kurz, B. Laurent, B. Loeher, C. Nociforo, C. Paradela, S. Pietri, A. Prochazka, D. Ramos, J. L. Rodríguez-Sànchez, C. Rodriguez, D. Rossi, H. Simon, L. Tassan-Got, H. Toernqvist, J. Vargas, B. Voss, and H. Weick
Subjects: General Medicine
Abstract: Low energy fission of 234,235,236,238U and 237,238Np radioactive beams, provided by the GSI/FRS facility, has been studied using the R3B/SOFIA setup. The latter allows, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This presentation reports on new results on elemental, isobaric and isotopic yields.
Published: 2023

36. Nature of seniority symmetry breaking in the semimagic nucleus Ru-94

Author: B. Das, B. Cederwall, C. Qi, M. Górska, P. H. Regan, Ö. Aktas, H. M. Albers, A. Banerjee, M. M. R. Chishti, J. Gerl, N. Hubbard, S. Jazrawi, J. Jolie, A. K. Mistry, M. Polettini, A. Yaneva, S. Alhomaidhi, J. Zhao, T. Arici, S. Bagchi, G. Benzoni, P. Boutachkov, T. Davinson, T. Dickel, E. Haettner, O. Hall, Ch. Hornung, J. P. Hucka, P. R. John, I. Kojouharov, R. Knöbel, D. Kostyleva, N. Kuzminchuk, I. Mukha, W. R. Plass, B. S. Nara Singh, J. Vasiljević, S. Pietri, Zs. Podolyák, M. Rudigier, H. Rösch, E. Sahin, H. Schaffner, C. Scheidenberger, F. Schirru, A. Sharma, R. Shearman, Y. Tanaka, J. Vesić, H. Weick, H. J. Wollersheim, U. Ahmed, A. Algora, C. Appleton, J. Benito, A. Blazhev, A. Bracco, A. M. Bruce, M. Brunet, R. Canavan, A. Esmaylzadeh, L. M. Fraile, G. Häfner, H. Heggen, D. Kahl, V. Karayonchev, R. Kern, A. Korgul, G. Kosir, N. Kurz, R. Lozeva, M. Mikolajczuk, P. Napiralla, R. Page, C. M. Petrache, N. Pietralla, J.-M. Régis, P. Ruotsalainen, L. Sexton, V. Sanchez-Temble, M. Si, J. Vilhena, V. Werner, J. Wiederhold, W. Witt, P. J. Woods, and G. Zimba
Subjects: Nuclear Theory, Física nuclear, Nuclear Experiment
Abstract: Direct lifetime measurements via gamma -gamma coincidences using a fast timing detector array consisting of LaBr3(Ce) scintillators has been applied to determine the lifetime of low-lying states in the semimagic (N = 50) nucleus Ru-94. The experiment was carried out as the first in a series of "FAIR-0" experiments with the DESPEC experimental setup at the Facility for Antiproton and Ion Research (FAIR). Excited states in Ru-94 were populated primarily via the beta-delayed proton emission of Pd-95 nuclei, produced in the projectile fragmentation of an 850 MeV/nucleon Xe-124 beam impinging on a 4 g/cm(2) Be-9 target. While the deduced E2 strength for the 2(+) -> 0(+) transition in the yrast cascade follows the expected behavior for conserved seniority symmetry, the intermediate 4(+) -> 2(+) transition exhibits a drastic enhancement of transition strength in comparison with pure-seniority model predictions as well as standard shell model predictions in the f pg proton hole space with respect to doubly magic Sn-100. The anomalous behavior is ascribed to a subtle interference between the wave function of the lowest seniority v = 2, I-pi = 4(+) state and that of a close-lying v = 4 state that exhibits partial dynamic symmetry. In addition, the observed strongly prohibitive 6(+) -> 4(+) transition can be attributed to the same mechanism but with a destructive interference. It is noted that such effects may provide stringent tests of the nucleon-nucleon interactions employed in state-of-the-art theoretical model calculations.
Published: 2022

37. Erratum to: Measurement of exclusive Υ photoproduction from protons in pPb collisions at s NN = 5.02 TeV (The European Physical Journal C, (2019), 79, 3, (277), 10.1140/epjc/s10052-019-6774-8)

Author: Sirunyan, A.M. Tumasyan, A. Adam, W. Ambrogi, F. Asilar, E. Bergauer, T. Brandstetter, J. Brondolin, E. Dragicevic, M. Erö, J. Valle, A.E.D. Flechl, M. Friedl, M. Frühwirth, R. Ghete, V.M. Grossmann, J. Hrubec, J. Jeitler, M. König, A. Krammer, N. Krätschmer, I. Liko, D. Madlener, T. Mikulec, I. Pree, E. Rad, N. Rohringer, H. Schieck, J. Schöfbeck, R. Spanring, M. Spitzbart, D. Taurok, A. Waltenberger, W. Wittmann, J. Wulz, C.-E. Zarucki, M. Chekhovsky, V. Mossolov, V. Gonzalez, J.S. De Wolf, E.A. Croce, D.D. Janssen, X. Lauwers, J. Pieters, M. De Klundert, M.V. Haevermaet, H.V. Mechelen, P.V. Remortel, N.V. Zeid, S.A. Blekman, F. D’Hondt, J. De Bruyn, I. De Clercq, J. Deroover, K. Flouris, G. Lontkovskyi, D. Lowette, S. Marchesini, I. Moortgat, S. Moreels, L. Python, Q. Skovpen, K. Tavernier, S. Doninck, W.V. Mulders, P.V. Parijs, I.V. Beghin, D. Bilin, B. Brun, H. Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. Fasanella, G. Favart, L. Goldouzian, R. Grebenyuk, A. Kalsi, A.K. Lenzi, T. Luetic, J. Seva, T. Starling, E. Velde, C.V. Vanlaer, P. Vannerom, D. Yonamine, R. Cornelis, T. Dobur, D. Fagot, A. Gul, M. Khvastunov, I. Poyraz, D. Roskas, C. Trocino, D. Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Zaganidis, N. Bakhshiansohi, H. Bondu, O. Brochet, S. Bruno, G. Caputo, C. Caudron, A. David, P. De Visscher, S. Delaere, C. Delcourt, M. Francois, B. Giammanco, A. Krintiras, G. Lemaitre, V. Magitteri, A. Mertens, A. Musich, M. Piotrzkowski, K. Quertenmont, L. Saggio, A. Marono, M.V. Wertz, S. Zobec, J. Júnior, W.L.A. Alves, F.L. Alves, G.A. Brito, L. Silva, G.C. Hensel, C. Moraes, A. Pol, M.E. Teles, P.R. Chagas, E.B.B.D. Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E.M. Da Silveira, G.G. De Jesus Damiao, D. De Souza, S.F. Malbouisson, H. Jaime, M.M. De Almeida, M.M. Herrera, C.M. Mundim, L. Nogima, H. Rosas, L.J.S. Santoro, A. Sznajder, A. Thiel, M. Manganote, E.J.T. Da Silva De Araujo, F.T. Pereira, A.V. Ahuja, S. Bernardes, C.A. Calligaris, L. Tomei, T.R.F.P. Gregores, E.M. Mercadante, P.G. Novaes, S.F. Padula, S.S. Abad, D.R. Vargas, J.C.R. Aleksandrov, A. Hadjiiska, R. Iaydjiev, P. Marinov, A. Misheva, M. Rodozov, M. Shopova, M. Sultanov, G. Dimitrov, A. Litov, L. Pavlov, B. Petkov, P. Fang, W. Gao, X. Yuan, L. Ahmad, M. Bian, J.G. Chen, G.M. Chen, H.S. Chen, M. Chen, Y. Jiang, C.H. Leggat, D. Liao, H. Liu, Z. Romeo, F. Shaheen, S.M. Spiezia, A. Tao, J. Wang, C. Wang, Z. Yazgan, E. Zhang, H. Zhao, J. Ban, Y. Chen, G. Li, J. Li, Q. Liu, S. Mao, Y. Qian, S.J. Wang, D. Xu, Z. Wang, Y. Avila, C. Cabrera, A. Montoya, C.A.C. Sierra, L.F.C. Florez, C. Hernández, C.F.G. Delgado, M.A.S. Courbon, B. Godinovic, N. Lelas, D. Puljak, I. Cipriano, P.M.R. Sculac, T. Antunovic, Z. Kovac, M. Brigljevic, V. Ferencek, D. Kadija, K. Mesic, B. Starodumov, A. Susa, T. Ather, M.W. Attikis, A. Mavromanolakis, G. Mousa, J. Nicolaou, C. Ptochos, F. Razis, P.A. Rykaczewski, H. Finger, M. Finger, M., Jr. Jarrin, E.C. Khalil, S. 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Woods, N. CMS Collaboration
Abstract: In this article the author name Luigi Calligaris was incorrectly written as A. Calligaris. The original article has been corrected. © CERN for the benefit of the CMS collaboration 2022.
Published: 2022

38. Evidence for X(3872) in Pb-Pb Collisions and Studies of its Prompt Production at root s(NN)=5.02 TeV

Author: Sirunyan, A. M. Tumasyan, A. Adam, W. Ambrogi, F. and Bergauer, T. Dragicevic, M. Ero, J. Del Valle, A. Escalante and Flechl, M. Fruhwirth, R. Jeitler, M. Krammer, N. and Kratschmer, I Liko, D. Madlener, T. Mikulec, I Rad, N. and Schieck, J. Schofbeck, R. Spanring, M. Waltenberger, W. and Wulz, C-E Zarucki, M. Drugakov, V Mossolov, V and Gonzalez, J. Suarez Darwish, M. R. De Wolf, E. A. Di Croce, D. Janssen, X. Kello, T. Lelek, A. Pieters, M. Sfar, H. Rejeb Van Haevermaet, H. Van Mechelen, P. Van Putte, S. and Van Remortel, N. Blekman, F. Bols, E. S. Chhibra, S. S. and D'Hondt, J. De Clercq, J. Lontkovskyi, D. Lowette, S. and Marchesini, I Moortgat, S. Python, Q. Tavernier, S. and Van Doninck, W. Van Mulders, P. Beghin, D. Bilin, B. and Clerbaux, B. De Lentdecker, G. Delannoy, H. Dorney, B. and Favart, L. Grebenyuk, A. Kalsi, A. K. Moureaux, L. and Popov, A. Postiau, N. Starling, E. Thomas, L. Vander Velde, C. Vanlaer, P. Vannerom, D. Cornelis, T. Dobur, D. Khvastunov, I Niedziela, M. Roskas, C. Skovpen, K. and Tytgat, M. Verbeke, W. Vermassen, B. Vit, M. Bruno, G. Caputo, C. David, P. Delaere, C. Delcourt, M. and Giammanco, A. Lemaitre, V Prisciandaro, J. Saggio, A. and Vischia, P. Zobec, J. Alves, G. A. Silva, G. Correia and Hensel, C. Moraes, A. Batista Das Chagas, E. Belchior and Carvalho, W. Chinellato, J. Coelho, E. Da Costa, E. M. and Da Silveira, G. G. Damiao, D. De Jesus Martins, C. De Oliveira and De Souza, S. Fonseca Malbouisson, H. Martins, J. and Figueiredo, D. Matos Jaime, M. Medina De Almeida, M. Melo and Herrera, C. Mora Mundim, L. Nogima, H. Prado Da Silva, W. L. and Teles, P. Rebello Rosas, L. J. Sanchez Santoro, A. and Sznajder, A. Thiel, M. Tonelli Manganote, E. J. Da Silva De Araujo, F. Torres Pereira, A. Vilela Bernardes, C. A. and Calligaris, L. Fernandez Perez Tomei, T. R. Gregores, E. M. and Lemos, D. S. Mercadante, P. G. Novaes, S. F. Padula, Sandra S. Aleksandrov, A. Antchev, G. Hadjiiska, R. Iaydjiev, P. 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Steen, A. Asavapibhop, B. and Asawatangtrakuldee, C. Srimanobhas, N. Suwonjandee, N. Bat, A. Boran, F. Celik, A. Damarseckin, S. Demiroglu, Z. S. and Dolek, F. Dozen, C. Dumanoglu, I Gokbulut, G. Guler, Emine Gurpinar Guler, Y. Hos, I Isik, C. Kangal, E. E. and Kara, O. Topaksu, A. Kayis Kiminsu, U. Onengut, G. and Ozdemir, K. Simsek, A. E. Tok, U. G. Turkcapar, S. and Zorbakir, I. S. Zorbilmez, C. Isildak, B. Karapinar, G. and Yalvac, M. Atakisi, I. O. Gulmez, E. Kaya, M. Kaya, O. and Tekten, S. Yetkin, E. A. Cakir, A. Cankocak, K. and Komurcu, Y. Sen, S. Cerci, S. Kaynak, B. Ozkorucuklu, S. and Cerci, D. Sunar Grynyov, B. Levchuk, L. Bhal, E. and Bologna, S. Brooke, J. J. Burns, D. Clement, E. Cussans, D. Flacher, H. Goldstein, J. Heath, G. P. Heath, H. F. and Kreczko, L. Krikler, B. Paramesvaran, S. Sakuma, T. and El Nasr-Storey, S. Seif Smith, V. J. Taylor, J. Titterton, A. Bell, K. W. Belyaev, A. Brew, C. Brown, R. M. and Cockerill, D. J. A. Coughlan, J. A. Harder, K. Harper, S. and Linacre, J. Manolopoulos, K. Newbold, D. M. Olaiya, E. and Petyt, D. Reis, T. Schuh, T. Shepherd-Themistocleous, C. H. Thea, A. Tomalin, I. R. Williams, T. Bainbridge, R. and Bloch, P. Bonomally, S. Borg, J. Breeze, S. and Buchmuller, O. Bundock, A. CHAHAL, Gurpreet Singh Colling, D. Dauncey, P. Davies, G. Della Negra, M. Everaerts, P. and Hall, G. Iles, G. Komm, M. Langford, J. Lyons, L. and Magnan, A-M Malik, S. Martelli, A. Milosevic, V and Morton, A. Nash, J. Palladino, V Pesaresi, M. Raymond, D. M. Richards, A. Rose, A. Scott, E. Seez, C. and Shtipliyski, A. Stoye, M. Strebler, T. Tapper, A. and Uchida, K. Virdee, T. Wardle, N. Webb, S. N. and Winterbottom, D. Zecchinelli, A. G. Zenz, S. C. Cole, J. E. and Hobson, P. R. Khan, A. Kyberd, P. Mackay, C. K. and Reid, I. D. Teodorescu, L. Zahid, S. Brinkerhoff, A. and Call, K. Caraway, B. Dittmann, J. Hatakeyama, K. Madrid, C. McMaster, B. Pastika, N. Smith, C. Bartek, R. and Dominguez, A. Uniyal, R. Hernandez, A. M. Vargas Buccilli, A. Cooper, I, S. Gleyzer, V, S. Henderson, C. Rumerio, P. West, C. Albert, A. Arcaro, D. Demiragli, Z. and Gastler, D. Richardson, C. Rohlf, J. Sperka, D. and Spitzbart, D. Suarez, I Sulak, L. Zou, D. Benelli, G. and Burkle, B. Coubez, X. Cutts, D. Duh, Y. T. Hadley, M. Heintz, U. Hogan, J. M. Kwok, K. H. M. Laird, E. and Landsberg, G. Lau, K. T. Lee, J. Narain, M. Sagir, S. and Syarif, R. Usai, E. Wong, W. Y. Yu, D. Zhang, W. and Band, R. Brainerd, C. Breedon, R. Sanchez, M. Calderon De La Barca Chertok, M. Conway, J. Conway, R. Cox, P. T. and Erbacher, R. Flores, C. Funk, G. Jensen, F. Ko, W. and Kukral, O. Lander, R. Mulhearn, M. Pellett, D. Pilot, J. and Shi, M. Taylor, D. Tos, K. Tripathi, M. Wang, Z. and Zhang, F. Bachtis, M. Bravo, C. Cousins, R. Dasgupta, A. and Florent, A. Hauser, J. Ignatenko, M. Mccoll, N. and Nash, W. A. Regnard, S. Saltzberg, D. Schnaible, C. and Stone, B. Valuev, V. Burt, K. Chen, Y. Clare, R. and Gary, J. W. Shirazi, S. M. A. Ghiasi Hanson, G. Karapostoli, G. Long, O. R. Manganelli, N. Negrete, M. Olmedo Paneva, I, M. Si, W. Wimpenny, S. Yates, B. R. Zhang, Y. and Branson, J. G. Chang, P. Cittolin, S. Cooperstein, S. and Deelen, N. Derdzinski, M. Duarte, J. Gerosa, R. Gilbert, D. Hashemi, B. Klein, D. Krutelyov, V Letts, J. and Masciovecchio, M. May, S. Padhi, S. Pieri, M. Sharma, V and Tadel, M. Wurthwein, F. Yagil, A. Della Porta, G. Zevi and Amin, N. Bhandari, R. Campagnari, C. Citron, M. and Dutta, V Incandela, J. Marsh, B. Mei, H. Ovcharova, A. and Qu, H. Richman, J. Sarica, U. Stuart, D. Wang, S. and Anderson, D. Bornheim, A. Cerri, O. Dutta, I and Lawhorn, J. M. Lu, N. Mao, J. Newman, H. B. Nguyen, T. Q. Pata, J. Spiropulu, M. Vlimant, J. R. Xie, S. and Zhang, Z. Zhu, R. Y. Alison, J. Andrews, M. B. Ferguson, T. Mudholkar, T. Paulini, M. Sun, M. Vorobiev, I and Weinberg, M. Cumalat, J. P. Ford, W. T. MacDonald, E. and Mulholland, T. Patel, R. Perloff, A. Stenson, K. Ulmer, K. A. Wagner, S. R. Alexander, J. Cheng, Y. Chu, J. and Datta, A. Frankenthal, A. Mcdermott, K. Patterson, J. R. and Quach, D. Ryd, A. Tan, S. M. Tao, Z. Thom, J. and Wittich, P. Zientek, M. Abdullin, S. Albrow, M. Alyari, M. Apollinari, G. Apresyan, A. Apyan, A. Banerjee, S. and Bauerdick, L. A. T. Beretvas, A. Berry, D. Berryhill, J. and Bhat, P. C. Burkett, K. Butler, J. N. Canepa, A. and Cerati, G. B. Cheung, H. W. K. Chlebana, F. Cremonesi, M. and Elvira, V. D. Freeman, J. Gecse, Z. Gottschalk, E. and Gray, L. Green, D. Grunendahl, S. Gutsche, O. Hanlon, J. and Harris, R. M. Hasegawa, S. Heller, R. Hirschauer, J. and Jayatilaka, B. Jindariani, S. Johnson, M. Joshi, U. and Klijnsma, T. Klima, B. Kortelainen, M. J. Kreis, B. and Lammel, S. Lewis, J. Lincoln, D. Lipton, R. Liu, M. and Liu, T. Lykken, J. Maeshima, K. Marraffino, J. M. Mason, D. McBride, P. Merkel, P. Mrenna, S. Nahn, S. and O'Dell, V Papadimitriou, V Pedro, K. Pena, C. Ravera, F. and Hall, A. Reinsvold Ristori, L. Schneider, B. and Sexton-Kennedy, E. Smith, N. Soha, A. Spalding, W. J. and Spiegel, L. Stoynev, S. Strait, J. Taylor, L. Tkaczyk, S. Tran, V, N. Uplegger, L. Vaandering, E. W. Vidal, R. and Wang, M. Weber, H. A. Woodard, A. Acosta, D. Avery, P. Bourilkov, D. Cadamuro, L. Cherepanov, V Errico, F. and Field, R. D. Guerrero, D. Joshi, B. M. Kim, M. and Konigsberg, J. Korytov, A. Lo, K. H. Matchev, K. and Menendez, N. Mitselmakher, G. Rosenzweig, D. Shi, K. and Wang, J. Wang, S. Zuo, X. Joshi, Y. R. Adams, T. and Askew, A. Hagopian, S. Hagopian, V Johnson, K. F. and Khurana, R. Kolberg, T. Martinez, G. Perry, T. Prosper, H. Schiber, C. Yohay, R. Zhang, J. Baarmand, M. M. and Hohlmann, M. Noonan, D. Rahmani, M. Saunders, M. and Yumiceva, F. Adams, M. R. Apanasevich, L. Betts, R. R. and Cavanaugh, R. Chen, X. Dittmer, S. Evdokimov, O. Gerber, C. E. Hangal, D. A. Hofman, D. J. Kumar, V Mills, C. and Oh, G. Roy, T. Tonjes, M. B. Varelas, N. Viinikainen, J. and Wang, H. Wang, X. Wu, Z. Alhusseini, M. Bilki, B. and Dilsiz, K. Durgut, S. Gandrajula, R. P. Haytmyradov, M. and Khristenko, V Koseyan, O. K. Merlo, J-P Mestvirishvili, A. Moeller, A. Nachtman, J. Ogul, H. Onel, Y. Ozok, F. Penzo, A. Snyder, C. Tiras, E. Wetzel, J. Yi, K. and Blumenfeld, B. Cocoros, A. Eminizer, N. Gritsan, V, A. and Hung, W. T. Kyriacou, S. Maksimovic, P. Mantilla, C. and Roskes, J. Swartz, M. Vami, T. A. Barrera, C. Baldenegro and Baringer, P. Bean, A. Boren, S. Bylinkin, A. Isidori, T. and Khalil, S. King, J. Krintiras, G. Kropivnitskaya, A. and Lindsey, C. Majumder, D. Mcbrayer, W. Minafra, N. and Murray, M. Rogan, C. Royon, C. Sanders, S. Schmitz, E. and Takaki, J. D. Tapia Wang, Q. Williams, J. Wilson, G. and Duric, S. Ivanov, A. Kaadze, K. Kim, D. Maravin, Y. and Mendis, D. R. Mitchell, T. Modak, A. Mohammadi, A. and Rebassoo, F. Wright, D. Baden, A. Baron, O. Belloni, A. and Eno, S. C. Feng, Y. Hadley, N. J. Jabeen, S. Jeng, G. Y. Kellogg, R. G. Mignerey, A. C. Nabili, S. Seidel, M. Skuja, A. Tonwar, S. C. Wang, L. Wong, K. and Abercrombie, D. Allen, B. Bi, R. Brandt, S. Busza, W. and Cali, I. A. D'Alfonso, M. Ceballos, G. Gomez Goncharov, M. Harris, P. Hsu, D. Hu, M. Klute, M. Kovalskyi, D. and Lee, Y-J Luckey, P. D. Maier, B. Marini, A. C. and Mcginn, C. Mironov, C. Narayanan, S. Niu, X. Paus, C. and Rankin, D. Roland, C. Roland, G. Shi, Z. Stephans, G. S. F. Sumorok, K. Tatar, K. Velicanu, D. Wang, J. and Wang, T. W. Wyslouch, B. Chatterjee, R. M. Evans, A. and Guts, S. Hansen, P. Hiltbrand, J. Jain, Sh Kubota, Y. and Lesko, Z. Mans, J. Revering, M. Rusack, R. Saradhy, R. Schroeder, N. Strobbe, N. Wadud, M. A. Acosta, J. G. and Oliveros, S. Bloom, K. Chauhan, S. Claes, D. R. and Fangmeier, C. Finco, L. Golf, F. Kamalieddin, R. and Kravchenko, I Siado, J. E. Snow, G. R. Stieger, B. Tabb, W. Agarwal, G. Harrington, C. Iashvili, I. Kharchilava, A. McLean, C. Nguyen, D. Parker, A. Pekkanen, J. and Rappoccio, S. Roozbahani, B. Alverson, G. Barberis, E. and Freer, C. Haddad, Y. Hortiangtham, A. Madigan, G. and Marzocchi, B. Morse, D. M. Nguyen, V Orimoto, T. and Skinnari, L. Tishelman-Charny, A. Wamorkar, T. Wang, B. and Wisecarver, A. Wood, D. Bhattacharya, S. Bueghly, J. and Fedi, G. Gilbert, A. Gunter, T. Hahn, K. A. Odell, N. and Schmitt, M. H. Sung, K. Velasco, M. Bucci, R. Dev, N. Goldouzian, R. Hildreth, M. Anampa, K. Hurtado and Jessop, C. Karmgard, D. J. Lannon, K. Li, W. Loukas, N. and Marinelli, N. Mcalister, I Meng, F. Musienko, Y. and Ruchti, R. Siddireddy, P. Smith, G. Taroni, S. Wayne, M. and Wightman, A. Wolf, M. Alimena, J. Bylsma, B. and Cardwell, B. Durkin, L. S. Francis, B. Hill, C. Ji, W. and Lefeld, A. Ling, T. Y. Winer, B. L. Dezoort, G. and Elmer, P. Hardenbrook, J. Haubrich, N. Higginbotham, S. and Kalogeropoulos, A. Kwan, S. Lange, D. Lucchini, M. T. and Luo, J. Marlow, D. Mei, K. Ojalvo, I Olsen, J. and Palmer, C. Piroue, P. Stickland, D. Tully, C. Malik, S. and Norberg, S. Barker, A. Barnes, V. E. Chawla, R. Das, S. Gutay, L. Jones, M. Jung, A. W. Mahakud, B. and Miller, D. H. Negro, G. Neumeister, N. Peng, C. C. and Piperov, S. Qiu, H. Schulte, J. F. Trevisani, N. Wang, F. Xiao, R. Xie, W. Cheng, T. Dolen, J. Parashar, N. and Baty, A. Behrens, U. Dildick, S. Ecklund, K. M. and Freed, S. Geurts, F. J. M. Kilpatrick, M. Kumar, Arun and Li, W. Padley, B. P. Redjimi, R. Roberts, J. Rorie, J. and Shi, W. Leiton, A. G. Stahl Tu, Z. Zhang, A. Bodek, A. de Barbaro, P. Demina, R. Dulemba, J. L. Fallon, C. and Ferbel, T. Galanti, M. Garcia-Bellido, A. Hindrichs, O. and Khukhunaishvili, A. Ranken, E. Taus, R. Chiarito, B. and Chou, J. P. Gandrakota, A. Gershtein, Y. Halkiadakis, E. and Hart, A. Heindl, M. Hughes, E. Kaplan, S. Laflotte, I and Lath, A. Montalvo, R. Nash, K. Osherson, M. Salur, S. Schnetzer, S. Somalwar, S. Stone, R. Thomas, S. and Acharya, H. Delannoy, A. G. Spanier, S. Bouhali, O. and Dalchenko, M. De Mattia, M. Delgado, A. Eusebi, R. and Gilmore, J. Huang, T. Kamon, T. Kim, H. Luo, S. and Malhotra, S. Marley, D. Mueller, R. Overton, D. Pernie, L. Rathjens, D. Safonov, A. Akchurin, N. Damgov, J. and De Guio, F. Hegde, V Kunori, S. Lamichhane, K. Lee, S. W. Mengke, T. Muthumuni, S. Peltola, T. Undleeb, S. and Volobouev, I Wang, Z. Whitbeck, A. Greene, S. Gurrola, A. Janjam, R. Johns, W. Maguire, C. Melo, A. Ni, H. and Padeken, K. Romeo, F. Sheldon, P. Tuo, S. Velkovska, J. Verweij, M. Arenton, M. W. Barria, P. Cox, B. and Cummings, G. Hakala, J. Hirosky, R. Joyce, M. Ledovskoy, A. Neu, C. Tannenwald, B. Wang, Y. Wolfe, E. Xia, F. and Harr, R. Karchin, P. E. Poudyal, N. Sturdy, J. and Thapa, P. Black, K. Bose, T. Buchanan, J. Caillol, C. and Carlsmith, D. Dasu, S. De Bruyn, I Dodd, L. Galloni, C. He, H. Herndon, M. Herve, A. Hussain, U. Lanaro, A. Loeliger, A. Loveless, R. Sreekala, J. Madhusudanan and Mallampalli, A. Pinna, D. Ruggles, T. Savin, A. Sharma, V Smith, W. H. Teague, D. Trembath-reichert, S. CMS Collaboration
Subjects: High Energy Physics::Experiment
Abstract: The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of root s(NN) = 5.02 TeV per nucleon pair, using the decay chain X(3872) -> J/psi pi(+)pi(-) -> mu(+) mu(-) pi(+)pi(-). The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb(-1). The measurement is performed in the rapidity and transverse momentum ranges vertical bar y vertical bar < 1.6 and 15 < p(T) < 50 GeV/c. The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to psi 2S yield ratio is found to be rho(Pb-Pb) = 1.08 +/- 0.49(stat) +/- 0.52(syst), to be compared with typical values of 0.1 for pp collisions. This result provides a unique experimental input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.
Published: 2022

39. 94 β -Decay Half-Lives of Neutron-Rich Cs55 to Ho67 : Experimental Feedback and Evaluation of the r -Process Rare-Earth Peak Formation

Author: J. Wu, S. Nishimura, G. Lorusso, P. Möller, E. Ideguchi, P.-H. Regan, G. S. Simpson, P.-A. Söderström, P. M. Walker, H. Watanabe, Z. Y. Xu, H. Baba, F. Browne, R. Daido, P. Doornenbal, Y. F. Fang, N. Fukuda, G. Gey, T. Isobe, Z. Korkulu, P. S. Lee, J. J. Liu, Z. Li, Z. Patel, V. Phong, S. Rice, H. Sakurai, L. Sinclair, T. Sumikama, M. Tanaka, A. Yagi, Y. L. Ye, R. Yokoyama, G. X. Zhang, D. S. Ahn, T. Alharbi, N. Aoi, F. L. Bello Garrote, G. Benzoni, A. M. Bruce, R. J. Carroll, K. Y. Chae, Z. Dombradi, A. Estrade, A. Gottardo, C. J. Griffin, N. Inabe, D. Kameda, H. Kanaoka, I. Kojouharov, F. G. Kondev, T. Kubo, S. Kubono, N. Kurz, I. Kuti, S. Lalkovski, G. J. Lane, E. J. Lee, T. Lokotko, G. Lotay, C.-B. Moon, D. Murai, H. Nishibata, I. Nishizuka, C. R. Nita, A. Odahara, Zs. Podolyák, O. J. Roberts, H. Schaffner, C. Shand, Y. Shimizu, H. Suzuki, H. Takeda, J. Taprogge, S. Terashima, Z. Vajta, and S. Yoshida
Published: 2017
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40. Reaction microscope for investigating ionization dynamics of weakly bound alkali dimers

Author: N. Kurz, D. Fischer, T. Pfeifer, and A. Dorn
Subjects: Instrumentation
Abstract: We report on the implementation of a far-off-resonant, optical dipole force trap in a reaction microscope combined with a magneto-optical trap. Kinematically complete multi-photon ionization experiments were performed on optically trapped 6Li atoms and photo-associated 6Li2 molecules in their highest vibrational state. The apparatus allows us to distinguish different ionization mechanisms related to the presence of the IR field of the optical dipole trap that can occur during ionization of 6Li and 6Li2 in strong fields. In a series of proof-of-principle experiments, we detect weakly bound dimers via three-photon ionization with femtosecond pulses ( τ = 30 fs) at a central wavelength of 780 nm and measure directly the momenta of the photoelectrons in coincidence with recoil ions.
Published: 2021

41. Fission-fragment yields and prompt-neutron multiplicity for Coulomb-induced fission of U234,235 and Np237,238

Author: S. Pietri, J. Benlliure, A. Chatillon, G. Boutoux, A. Kelic-Heil, D. M. Rossi, B. Jurado, F. Farget, A. Prochazka, C. Nociforo, J. F. Martin, E. Casarejos, Bernd Voss, B. Laurent, H. Alvarez-Pol, M. Caamaño, T. Gorbinet, Y. Ayyad, G. Belier, L. Grente, J. Vargas, D. Cortina-Gil, E. Pellereau, C. Paradela, A. Ebran, B. Fernández-Domínguez, L. Tassan-Got, Helmut Weick, L. Audouin, Andreas Martin Heinz, Håkan Johansson, N. Kurz, J. L. Rodriguez-Sanchez, J. Taieb, and Herbert A. Simon
Subjects: Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, Prompt neutron, 0103 physical sciences, medicine, Neutron, Atomic number, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Nucleus, Excitation
Abstract: Low-energy fission of and radioactive beams, provided by the Fragment Separator (FRS) of the GSI Helmholtzzentrum fur Schwerionenforschung facility (GSI), has been studied using the Reactions with Relativistic Radioactive Beams / Studies on Fission with Aladin (R3B/SOFIA) setup. The latter allows us, on an event-by-event basis, to simultaneously identify, in terms of their mass and atomic numbers, the fissioning nucleus in coincidence with both fission fragments after prompt-neutron emission. This article reports new results on elemental, isotonic, isobaric, and isotopic yields. Moreover, the high accuracy of our data allowed us to study in detail proton even-odd staggering, from elemental yields; neutron excess, from isotopic yields; and total prompt-neutron multiplicity, from the difference of masses of the fissioning nucleus and fission fragments. These results are then compared to previous experimental data in order to probe how these fission observables change as function of the excitation energy and atomic and neutron numbers of the compound nucleus.
Published: 2021

42. Commissioning the FAst TIMing array (FATIMA) at FAIR Phase-0: Half-lives of excited states in the N=50 isotones 96Pd and 94Ru

Author: S. Jazrawi, A. Yaneva, M. Polettini, B. Das, P.H. Regan, M. Górska, B. Cederwall, J. Jolie, H.M. Albers, M.M.R. Chishti, A. Banerjee, N. Hubbard, A.K. Mistry, M. Rudigier, G. Benzoni, J. Gerl, A.M. Bruce, Zs Podolyák, B.S. Nara Singh, G.X. Zhang, S. Alhomaidhi, C. Appleton, T. Arici, A. Blazhev, T. Davinson, A. Esmaylzadeh, L.M. Fraile, G. Häfner, O. Hall, P.R. John, V. Karayonchev, I. Koujoharov, N. Kurz, M. Mikolajczuk, N. Pietralla, S. Pietri, J.M. Regis, E. Sahin, L. Sexton, H. Schaffner, C. Scheidenberger, A. Sharma, J. Vesic, H. Weick, V. Werner, R. Lozeva, and M. Si
Subjects: Radiation
Published: 2022

43. AWAGS: A single ASIC to identify fast ions from protons to uranium

Author: E. Rocco, P. Wieczorek, H. Flemming, N. Kurz, S. Löchner, C. Nociforo, C.J. Schmidt, H. Simon, B. Voss, M. Winkler, F. García, T. Grahn, and M. Luoma
Subjects: Nuclear and High Energy Physics, Instrumentation
Published: 2022

44. Spontaneous fission instability of the neutron-deficient No and Rf isotopes: The new isotope No249

Author: Ch. E. Düllmann, F. P. Heßberger, Egon Jäger, Bettina Lommel, Alexander Yakushev, Birgit Kindler, J. Krier, B. Schausten, H. Brand, R. A. Cantemir, N. Kurz, and J. Khuyagbaatar
Subjects: Physics, Isotope, Atomic orbital, Fission, Atomic nucleus, Electron shell, Neutron, Atomic physics, Nuclear Experiment, Spontaneous fission, Line (formation)
Abstract: In the heaviest elements, the instability of atomic nuclei against spontaneous fission leads to ever shorter nuclear half-lives. Upon falling below a timescale of ${10}^{\ensuremath{-}14}$ s, the border of existence of isotopes is crossed because this is the timescale on which the formation of atomic shells occurs. Analysis of the experimental data on the spontaneous fission half-lives of Rf isotopes in relation with their expected single-particle orbitals hint at a potentially abrupt decrease in half-lives of unknown neutron-deficient Rf isotopes with neutron numbers $l149$, which suggests that the isotopic border is already almost reached. However, this conjecture, which cannot be explained within the current knowledge, was directly related to uncertainty in the experimental data on $^{253}\mathrm{Rf}$. We revisited the decay of $^{253}\mathrm{Rf}$ and identified two fission activities, which are attributed to decays of the two different states with half-lives of $12.{8}_{\ensuremath{-}3.4}^{+7.0}$ ms and ${44}_{\ensuremath{-}10}^{+17}\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$. In addition, hitherto unknown $\ensuremath{\alpha}$ decay in $^{253}\mathrm{Rf}$, which is followed by $\ensuremath{\alpha}$ decay of the new isotope $^{249}\mathrm{No}$ with a half-life of ${15}_{\ensuremath{-}7}^{+74}$ ms, was observed. Based on our new data, no abrupt decreases in half-lives of the neutron-deficient No and Rf isotopes are expected, which is in line with theoretical predictions. Fission half-lives of the two different states in $^{253}\mathrm{Rf}$ are benchmark cases for the theoretical description of the single-particle orbital influence on the fission process.
Published: 2021

45. Three-quasiparticle isomers in odd-even Pm159,161 : Calling for modified spin-orbit interaction for the neutron-rich region

Author: Tetsuro Komatsubara, Toshiyuki Kubo, Long-Jun Wang, I. Kojouharov, H. Baba, Y. F. Fang, Giuseppe Lorusso, Jan Taprogge, F. L. Bello Garrote, I. Nishizuka, Hirofumi Watanabe, Masafumi Matsushita, Shunji Nishimura, S. Inabe, A. Gottardo, H. Schaffner, Z. H. Li, Motoki Kobayashi, L. Sinclair, F. Browne, G. Benzoni, Nori Aoi, M. Tanaka, D. Kameda, E. Sahin, Gary Simpson, Cui Juan Lv, Zhengyu Xu, Toshiyuki Sumikama, Guillaume Gey, Shintaro Go, Chang-Bum Moon, P. Doornenbal, Hiroyuki Takeda, Zena Patel, T. Isobe, Hiroshi Suzuki, Atsuko Odahara, R. Yokoyama, N. Kurz, Naoki Fukuda, Stephen Rice, Zs. Vajta, Yang Sun, Hiroyoshi Sakurai, Shin'ichiro Michimasa, P. A. Söderström, Ayumi Yagi, Eiji Ideguchi, Yan Xin Liu, István Kuti, K. Kobayashi, R. Daido, Jinguang Wu, and Hiroki Nishibata
Subjects: Physics, Isotope, 010308 nuclear & particles physics, Fission, Spin–orbit interaction, 01 natural sciences, Ion, 0103 physical sciences, Quasiparticle, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Nucleon
Abstract: Neutron-rich Pm ( Z = 61 ) isotopes were studied by delayed γ -ray spectroscopy at RIBF, RIKEN Nishina Center using the in-flight fission of a 345 MeV/nucleon U 238 beam. A cluster-type Ge detector array, EURICA, was used to measure the delayed γ rays from stopped ions. Isomeric γ decays were observed in Pm 159 and Pm 161 with half-lives of 4.97(12) μ s and 0.79(4) μ s , respectively. Level schemes for Pm 159 and Pm 161 were constructed in this study. The isomeric states of Pm 159 and Pm 161 could be interpreted as two quasiparticle excitations of neutrons with the configurations of ν ( 7 / 2 [ 633 ] ⊗ 5 / 2 [ 523 ] ) and ν ( 7 / 2 [ 633 ] ⊗ 1 / 2 [ 521 ] ) , respectively. They are analogous to the isomers that have been observed systematically in other even-mass N = 98 and N = 100 isotones in this region. A projected shell model calculation was performed and it reproduced the order of three-quasiparticle states only if new Nilsson parameters with an N -dependent spin-orbit interaction were used. This work demonstrates that the strength of spin-orbit interactions in standard Nilsson parameters needs to be modified to study the properties of neutron-rich rare-earth nuclei around A = 165 , and provides new evidence supporting the existence of the deformed N = 98 subshell gap in odd-mass nuclei for the first time.
Published: 2021

46. Persistence of the Z=28 shell gap in A=75 isobars: Identification of a possible (1/2−) μs isomer in Co75 and β decay to Ni75

Author: Hiroki Nishibata, A. I. Morales, Hirofumi Watanabe, Shin-Ichiro Nishimura, Megumi Niikura, Daisuke Suzuki, H. S. Jung, V. Werner, Ryo Taniuchi, D. Sohler, D. R. Napoli, Jan Taprogge, T. Isobe, N. Kurz, I. Kojouharov, Toshiyuki Sumikama, Jinguang Wu, P. A. Söderström, Ayumi Yagi, I. Matea, P. Morfouace, P. R. John, S. Franchoo, Shigeru Kubono, S. Escrig, F. Naqvi, Alfredo Poves, Atsuko Odahara, K. Matsui, Giuseppe Lorusso, H. Baba, Hiroyoshi Sakurai, Zhengyu Xu, Z. H. Li, E. Sahin, P. Doornenbal, D. Mengoni, Zs. Vajta, H. Schaffner, K. Yoshinaga, I. Stefan, F. Browne, and Guillaume Gey
Subjects: Physics, Proton, 010308 nuclear & particles physics, Center (category theory), Nuclear structure, Nuclear isomer, 7. Clean energy, 01 natural sciences, Spectral line, Nuclear physics, Nucleosynthesis, Excited state, 0103 physical sciences, Isobar, 010306 general physics
Abstract: Background: The evolution of shell structure around doubly-magic exotic nuclei is of great interest in nuclear physics and astrophysics. In the `south-west' region of $^{78}$Ni, the development of deformation might trigger a major shift in our understanding of explosive nucleosynthesis. To this end, new spectroscopic information on key close-lying nuclei is very valuable. Purpose: We intend to measure the isomeric and $\beta$ decay of $^{75}$Co, with one proton- and two neutron-holes relative to $^{78}$Ni, to access new nuclear structure information in $^{75}$Co and its $\beta$-decay daughters $^{75}$Ni and $^{74}$Ni. Methods: The nucleus $^{75}$Co is produced in relativistic in-flight fission reactions of $^{238}$U at the Radioactive Ion Beam Factory (RIBF) in the RIKEN Nishina Center. Its isomeric and $\beta$ decay are studied exploiting the BigRIPS and EURICA setups. Results: We obtain partial $\beta$-decay spectra for $^{75}$Ni and $^{74}$Ni, and report a new isomeric transition in $^{75}$Co. The energy ($E_{\gamma}=1914(2)$ keV) and half-life ($t_{1/2}=13(6)$ $\mu$s) of the delayed $\gamma$ ray lend support for the existence of a $J^{\pi}=(1/2^-)$ isomeric state at 1914(2) keV. A comparison with PFSDG-U shell-model calculations provides good account for the observed states in $^{75}$Ni, but the first calculated $1/2^-$ level in $^{75}$Co, a prolate $K=1/2$ state, is predicted about 1 MeV below the observed $(1/2^-)$ level. Conclusions: The spherical-like structure of the lowest-lying excited states in $^{75}$Ni is proved. In the case of $^{75}$Co, the results suggest that the dominance of the spherical configurations over the deformed ones might be stronger than expected below $^{78}$Ni. Further experimental efforts to discern the nature of the $J^{\pi}=(1/2^-)$ isomer are necessary.
Published: 2021

47. Isomeric states in Rf256

Author: J. Krier, Birgit Kindler, S. Götz, Alexander Yakushev, Egon Jäger, J. Khuyagbaatar, B. Schausten, Bettina Lommel, H. Brand, Ch. E. Düllmann, F. P. Heßberger, R. A. Cantemir, N. Kurz, and M. Götz
Subjects: Physics, Good quantum number, education.field_of_study, Population, Transactinide element, Production (computer science), Electron, Atomic physics, education, Recoil separator
Abstract: The question of the number and origin of isomeric states in $^{256}\mathrm{Rf}$ arose from two independent experiments but remained unanswered for a decade. To shed light on this puzzle, we studied isomeric decay in $^{256}\mathrm{Rf}$ by measuring conversion electrons with fast fully digital electronics. $^{256}\mathrm{Rf}$ was produced in the fusion-evaporation reactions of $^{50}\mathrm{Ti}+^{207}\mathrm{Pb}$ and $^{50}\mathrm{Ti}+^{208}\mathrm{Pb}$ at the gas-filled recoil separator TransActinide Separator and Chemistry Apparatus. Among a total of 120 decays of $^{256}\mathrm{Rf}$, we detected 22 and 12 decays proceeding through one and two isomeric states. Half-lives of the low- and higher-lying states were assigned to be ${T}_{1/2}={14}_{\ensuremath{-}4}^{+6}$ and ${10}_{\ensuremath{-}3}^{+5}\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{s}$, respectively. Population rates of these isomeric states were estimated to be $\ensuremath{\approx}18%$ and $g10%$, which are similar to those for two-quasiparticle $K$ isomeric states in this region of nuclei. The results, thus, confirm an earlier claim on the existence of multiple $K$ isomeric states in $^{256}\mathrm{Rf}$ and show their population rates are as high as in No isotopes. Suggestively, $K$ remains a good quantum number in isotopes of heavier elements like Sg and Hs, where yet unknown high-$K$ isomeric states still could exist. The present experimental results demonstrate that the ``triggerless'' measurement guarantees an efficient detection of delayed conversion electron signals. Thus, it is a very efficient method for the identification of isomeric states in experiments with one nucleus-at-a-time production rates.
Published: 2021

48. Erratum: Properties of γ -decaying isomers and isomeric ratios in the Sn100 region [Phys. Rev. C 96 , 044311 (2017)]

Author: J. Park, R. Krücken, D. Lubos, R. Gernhäuser, M. Lewitowicz, S. Nishimura, D. S. Ahn, H. Baba, B. Blank, A. Blazhev, P. Boutachkov, F. Browne, I. Čeliković, G. de France, P. Doornenbal, T. Faestermann, Y. Fang, N. Fukuda, J. Giovinazzo, N. Goel, M. Górska, H. Grawe, S. Ilieva, N. Inabe, T. Isobe, A. Jungclaus, D. Kameda, G. D. Kim, Y.-K. Kim, I. Kojouharov, T. Kubo, N. Kurz, G. Lorusso, K. Moschner, D. Murai, I. Nishizuka, Z. Patel, M. M. Rajabali, S. Rice, H. Sakurai, H. Schaffner, Y. Shimizu, L. Sinclair, P.-A. Söderström, K. Steiger, T. Sumikama, H. Suzuki, H. Takeda, Z. Wang, H. Watanabe, J. Wu, and Z. Y. Xu
Subjects: Physics, 010308 nuclear & particles physics, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences
Published: 2021

49. The 48Ca+181Ta reaction: Cross section studies and investigation of neutron-deficient 86 ≤ Z ≤ 93 isotopes

Author: F. Dechery, P. Chhetri, J. Piot, Dieter Ackermann, L. Lens, M. Vostinar, P. Mosat, Alexander Yakushev, M. Laatiaoui, Michael Block, J. Hoffmann, Ch. E. Düllmann, F. P. Heßberger, A. K. Mistry, Zhen-Xia Zhang, S. Raeder, J. Maurer, O. Kaleja, C. Droese, J. Khuyagbaatar, B. Andel, F. Giacoppo, N. Kurz, S. Antalic, Grand Accélérateur National d'Ions Lourds (GANIL), 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), and 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)
Subjects: Physics, Nuclear and High Energy Physics, Proton, Isotope, 010308 nuclear & particles physics, Projectile, Neptunium, Nuclear Theory, chemistry.chemical_element, Digital electronics for nuclear spectroscopy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, chemistry, 0103 physical sciences, Alpha decay, Neutron, Decay chain, Heavy-ion induced fusion, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract: © 2019 Fusion-evaporation reactions with the doubly magic projectile 48 Ca were used to access neutron-deficient nuclei around neptunium at the velocity filter SHIP, and investigated using the COMPASS decay spectroscopy station. With the use of digital electronics, several isotopes produced via neutron, proton, and α evaporation channels were identified by establishing correlated α-decay chains with short-lived sub-μs members. Data are given on decay chains stemming from 225,226 Np, 225 U, and 222,223 Pa. New information on the isotopes 225,226 Np and 222 Pa was obtained. Production cross sections of nuclei in the region using a variety of projectiles are discussed. The measured production cross-sections indicate that the usual advantages of using 48 Ca as a beam projectile to produce nuclei Z>100 are absent in the production of these slightly lighter nuclei. ispartof: NUCLEAR PHYSICS A vol:987 pages:337-349 status: published
Published: 2019

50. COMPASS—A COMPAct decay spectroscopy set-up

Author: O. Kaleja, H. Savajols, M. Laatiaoui, P. Chhetri, P. Mosat, Michael Block, J. C. Thomas, F. Giacoppo, O. Sorlin, S. Antalic, P. Wieczorek, J. Hoffmann, Alexander Yakushev, N. Kurz, S. Raeder, J. Khuyagbaatar, M. Vostinar, T. Murböck, Ch. E. Düllmann, F. P. Heßberger, O. Kamalou, Dieter Ackermann, F. Dechery, J. Piot, B. Andel, R.R. Mändl, J. Maurer, L. Caceres, Zhong Zhang, Ch. Stodel, C. Droese, A. K. Mistry, 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), and 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)
Subjects: Nuclear and High Energy Physics, [formula omitted], Ion beam, γ, α, Large volume Ge detectors, 7. Clean energy, 01 natural sciences, Signal, 99-00, Optics, 0103 physical sciences, Si strip detector, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Spectroscopy, Instrumentation, CE and X-ray spectroscopy, Digital signal processing, Physics, 010308 nuclear & particles physics, business.industry, Detector, Digital electronics, 00-01, Chip, Filter (video), Granularity, business
Abstract: A compact silicon detector array with high spatial granularity and fast, fully digital data recording has been developed and commissioned for the investigation of heavy and superheavy nuclear species. The detector array can be combined in close geometry with large volume germanium detectors. It offers comprehensive particle and photon coincidence and correlation spectroscopy by highly efficient evaporation residue, α , γ , conversion electron and X-ray detection supported by the high granularity of the implantation chip. Access to fast decay events in the sub-microsecond region is made possible by the fast timing properties of the digital signal processing. A novel Si-chip support design allows direct cooling of the Si-chips and short signal transport. The compact and modular mechanical design equipped with a standard flange facilitates its transport and connection to different separators at different ion beam facilities. After initial tests, first α - γ coincidence spectroscopy experiments have been performed at the LISE separator of GANIL in Caen, France, in FULIS (velocity filter) mode and at the velocity filter SHIP of GSI in Darmstadt, Germany.
Published: 2018

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