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522 results on '"BALABANSKI, D. L."'

101. Rb-37(97)60 : The Cornerstone of the Region of Deformation around A similar to 100

Author

Sotty, C., Zielinska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, R., Das Gupta, S., Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadynska-Klek, K., Kondev, F. G., Konki, J., Kroell, T., Morel, P., Napiorkowski, P., Pakarinen, J., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Toernqvist, H., Warr, N., Wenander, F., and Helsinki Institute of Physics

Subjects
NEUTRON-RICH NUCLEI, ZR-100, STATES, MOMENTS, FISSION FRAGMENTS, DETECTOR, 114 Physical sciences
Abstract

Excited states of the neutron-rich nuclei Rb-97,Rb- 99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb-97 as being built on the pi g(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N = 60 and rotational bands above. The present study defines the limits of the deformed region around A similar to 100 and indicates that the deformation of Rb-97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb-99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015

102. Rb379760: The Cornerstone of the Region of Deformation around A∼100

Author

Sotty, C., Zielińska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, Rémy, Das Gupta, S., Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadyńska-Klȩk, K., Kondev, F. G., Konki, J., Kröll, T., Morel, Pierre, Napiorkowski, P., Pakarinen, J., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Törnqvist, H., Warr, N., Wenander, F., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM SNO), Université Paris-Saclay-Univ. Paris-Sud-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Excited states of the neutron-rich nuclei Rb97,99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb97 as being built on the πg9/2 [431] 3/2+ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of Rb97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015
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103. Gamma-beam photofission experiments at ELI-NP: The future is emerging.

Author

Köster, U., Balabanski, D. L., Choudhury, D., Oberstedt, A., Krasznahorkay, A., Csige, L., Gulyas, J., Csatlos, M., and Coban, S.

Subjects
*PHOTOFISSION, *GAMMA rays, *NUCLEAR physics, *LASERS in physics, *EXPERIMENTAL programs
Abstract

At the Extreme Light Infrastructure - Nuclear Physics facility (ELI-NP), high-power laser systems together with high-brilliance gamma beams are the main research tools. The status of the construction of the facility is reported. The emerging photofission experimental program with brilliant gamma beams at ELI-NP is presented with emphasis on the prepared day-one experiments. The physics cases of the flagship experiments at ELI-NP are discussed, as well as the related instruments which are under construction for their realization. [ABSTRACT FROM AUTHOR]

Published
2018

104. Active Target for α-Particle Condensation Studies in 16O.

Author

Margaryan, A. T., Khachatryan, V. H., Vardanyan, H. S., Grigoryan, N. K., Ajvazyan, R. B., Kakoyan, V. H., Khachatryan, P. A., Zhamkochyan, S. V., Balabanski, D. L., Annand, J. R. M., Livingston, K., Montgomery, R., Filikh, I., Mohammad, A., and Vlahovic, B.

Abstract

An active target has been developed for studying the Hoyle like states in 16O. It is a position and time sensitive detector system based on the Low-Pressure Multy-Wire Proportional Chamber (LPMWPC) technique and Si detectors. The few Torr pressure of methyl ((OCH3)2CH2) serves as a working gas for the LPMWPC operation, and the oxygen atoms of the methyl molecules serve as an experimental target. The main advantage of this new target-detector system is a high sensitivity to the low-energy, highly ionizing particles, produced after photodisintegration of 16O, and the insensitivity to the γ-rays and low ionizing particles, which allows one to detect only the products of the nuclear reaction, which are studied. The threshold energies for detection of α particles and 12C nuclei are about 50 keV and 100 keV, respectively. Temporal and positional resolution of the LPMWPC modules was investigated with the use of the α-particle source. This paper discusses the architecture of the active target and the test results of the prototype MWPC detector. This installation has been constructed to study the cluster states at 15.1 MeV in 16O using the proton beams from the Yerevan proton cyclotron and the Compton backscattered photon beams of the ELI-NP facility. [ABSTRACT FROM AUTHOR]

Published
2019
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105. Toward lifetime and g factor measurements of short-lived states in the vicinity of Pb-208

Author

Ralet, D., Georgiev, G., Stuchbery, A. E., Clement, E., Lemasson, A., Michelagnoli, C., Rejmund, M., Atanasova, L., Balabanski, D. L., Bocchi, G., Carroll, R., Dewald, A., Dudouet, J., Fornal, B., de France, G., Franchoo, S., Fransen, C., Mueller-Gatermann, C., Goasduff, A., Gadea, A., Jacquot, B., John, P. R., Kocheva, D., Konstantinopoulos, T., Korichi, A., Kusoglu, A., Lenzi, S. M., Leoni, S., Ljungvall, J., Lozeva, R., Maj, A., Navin, A., Perez, R., Pietralla, N., Shand, C., Stezowski, O., Yordanov, D., Ralet, D., Georgiev, G., Stuchbery, A. E., Clement, E., Lemasson, A., Michelagnoli, C., Rejmund, M., Atanasova, L., Balabanski, D. L., Bocchi, G., Carroll, R., Dewald, A., Dudouet, J., Fornal, B., de France, G., Franchoo, S., Fransen, C., Mueller-Gatermann, C., Goasduff, A., Gadea, A., Jacquot, B., John, P. R., Kocheva, D., Konstantinopoulos, T., Korichi, A., Kusoglu, A., Lenzi, S. M., Leoni, S., Ljungvall, J., Lozeva, R., Maj, A., Navin, A., Perez, R., Pietralla, N., Shand, C., Stezowski, O., and Yordanov, D.

Abstract

The multi-nucleon transfer reaction mechanism was used to produce and study nuclei in the vicinity of 208Pb. This mass region is a test case for the nuclear shell model. The mass identification of the fragments was performed with the large acceptance magnetic spectrometer VAMOS++ coupled to the AGATA gamma-tracking array. This experiment aimed to determine both lifetimes and gyromagnetic ratios of excited states with the Cologne plunger device. The analysis indicates promising results with the possibility to determine several new lifetimes in this region.

Published
2017

106. 97/37 Rb 60 : The Cornerstone of the Region of Deformation around A∼100

Author

Sotty, C., Zielińska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, R., Gupta, S. Das, Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadyńska-Klȩk, K., Kondev, F. G., Konki, Joonas, Kröll, T., Morel, P., Napiorkowski, P., Pakarinen, Janne, Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Törnqvist, H., Warr, N., and Wenander, F.

Subjects
rubidium, neutron-rich nuclei, Coulomb excitation
Abstract

Excited states of the neutron-rich nuclei 97,99Rb were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of 97Rb as being built on the πg9/2 [431] 3/2+ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of 97Rb is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The 99Rb case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams. peerReviewed

Published
2015

107. $^{97}_{37}$Rb$_{60}$: The Cornerstone of the Region of Deformation around $A\sim 100$

Author

Sotty, C, Zielińska, M, Georgiev, G, Balabanski, D L, Stuchbery, A E, Blazhev, A, Bree, N, Chevrier, R, Das Gupta, S, Daugas, J M, Davinson, T, De Witte, H, Diriken, J, Gaffney, L P, Geibel, K, Hadyńska-Klȩk, K, Kondev, F G, Konki, J, Kröll, T, Morel, P, Napiorkowski, P, Pakarinen, J, Reiter, P, Scheck, M, Seidlitz, M, Siebeck, B, Simpson, G, Törnqvist, H, Warr, N, and Wenander, F

Subjects
Nuclear Physics - Experiment
Abstract

Excited states of the neutron-rich nuclei Rb97,99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb97 as being built on the πg9/2 [431] 3/2+ Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N=60 and rotational bands above. The present study defines the limits of the deformed region around A∼100 and indicates that the deformation of Rb97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015

108. Chiral Doublet Structures in Odd-Odd N = 75 Isotones: Chiral Vibrations

Author

Starosta, K., Koike, T., Chiara, C. J., Fossan, D. B., LaFosse, D. R., Hecht, A. A., Beausang, C. W., Caprio, M. A., Cooper, J. R., Krücken, R., Novak, J. R., Zamfir, N. V., Zyromski, K. E., Hartley, D. J., Balabanski, D. L., Zhang, Jing-ye, Frauendorf, S., and Dimitrov, V. I.

Published
2001

109. High-spin states in (191,193)Au and (192)Pt: Evidence for oblate deformation and triaxial shapes

Author

Oktem, Y., Balabanski, D. L., Akkus, B., Beausang, W., Bostan, M., Cakirli, R. B., Casten, R. F., Danchev, M., Djongolov, M., Erduran, M. N., Erturk, S., Gladniski, K. A., Gurdal, G., Goon, J. Tm., Hartley, D. J., Hecht, A. A., Krucken, R., Nikolov, N., Novak, J. R., Rainovski, G., Riedinger, L. L., Yigitoglu, I., Zamfir, N. V., Zeidan, O., Rainovski, Georgi -- 0000-0002-1729-0249, Kruecken, Reiner -- 0000-0002-2755-8042, and [Oktem, Y. -- Akkus, B. -- Bostan, M. -- Cakirli, R. B. -- Erduran, M. N.] Univ Istanbul, Dept Phys, TR-34459 Istanbul, Turkey -- [Balabanski, D. L.] Bulgarian Acad Sci, Inst Nucl Res & Nucl Energy, BG-1784 Sofia, Bulgaria -- [Beausang, W. -- Casten, R. F. -- Hecht, A. A. -- Krucken, R. -- Novak, J. R. -- Zamfir, N. V.] Yale Univ, Wright Nucl Struct Lab, New Haven, CT 06520 USA -- [Beausang, W.] Univ Richmond, Dept Phys, Richmond, VA 23173 USA -- [Danchev, M. -- Djongolov, M. -- Hartley, D. J. -- Nikolov, N. -- Riedinger, L. L. -- Zeidan, O.] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA -- [Erturk, S.] Nigde Univ, Dept Phys, TR-51200 Nigde, Turkey -- [Gladniski, K. A. -- Nikolov, N. -- Rainovski, G.] St Kliment Ohridski Univ Sofia, Fac Phys, BG-1164 Sofia, Bulgaria -- [Gurdal, G.] Clark Univ, Worcester, MA 01610 USA -- [Goon, J. Tm.] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA -- [Hartley, D. J.] USN Acad, Dept Phys, Annapolis, MD 21402 USA -- [Hecht, A. A.] Univ Maryland, Dept Chem & Biochem, College Pk, MD 20742 USA -- [Yigitoglu, I.] Istanbul Univ, Hasan Ali Yucel Fac Educ, TR-34470 Istanbul, Turkey -- [Zamfir, N. V.] Natl Inst Phys & Nucl Engn, Bucharest, Romania

Abstract

WOS: 000250620900030, High-spin states of (191,193)Au and (192)Pt have been populated in the (186)W((11)B, xn) and (186)W((11)B, p4n) reactions, respectively, at a beam energy of 68 MeV and their gamma decay was studied using the YRAST Ball detector array at the Wright Nuclear Structure Laboratory at Yale University. The level scheme of (193)Au has been extended up to I(pi)=55/2(+). New transitions were observed also in (191)Au and (192)Pt. Particle-plus-Triaxial-Rotor (PTR) and Total Routhian Surface (TRS) calculations were performed to determine the equilibrium deformations of the Au isotopes. The predictions for oblate deformations in these nuclei are in agreement with the experimental data. Development of nonaxial shapes is discussed within the framework of the PTR model.

Published
2007

112. Brilliant gamma beams for industrial applications: new opportunities, new challenges

Author

10335226, Iancu, V, Suliman, G, Turturica, G V, Iovea, M, Daito, I, Ohgaki, H, Matei, C, Ur, C A, Balabanski, D L, 10335226, Iancu, V, Suliman, G, Turturica, G V, Iovea, M, Daito, I, Ohgaki, H, Matei, C, Ur, C A, and Balabanski, D L

Abstract

The Nuclear Physics oriented pillar of the pan-European Extreme Light Infrastructure (ELI-NP) will host an ultra-bright, energy tunable, and quasi-monochromatic gamma-ray beam system in the range of 0.2-19.5 MeV produced by laser-Compton backscattering technique. The applied research program envisioned at ELI-NP targets to use nuclear resonance fluorescence (NRF) and computed tomography to provide new opportunities for industry and society. High sensitivity NRF-based investigations can be successfully applied to safeguard applications and management of radioactive wastes as well as to uncharted fields like cultural heritage and medical imaging. Gamma-ray radioscopy and computed tomography performed at ELI-NP has the potential to achieve high resolution in industrial-sized objects provided the detection challenges introduced by the unique characteristics of the gamma beam are overcome. Here we discuss the foreseen industrial applications that will benefit from the high quality and unique characteristics of ELI-NP gamma beam and the challenges they present. We present the experimental setups proposed to be implemented for this goal, discuss their performance based on analytical calculations and numerical Monte-Carlo simulations, and comment about constrains imposed by the limitation of current scintillator detectors. Several gamma-beam monitoring devices based on scintillator detectors will also be discussed.

Published
2016

115. Magnetic moment of the13/2+isomeric state inCu69: Spin alignment in the one-nucleon removal reaction

Author

Kusoglu, A., primary, Georgiev, G., additional, Sotty, C., additional, Balabanski, D. L., additional, Goasduff, A., additional, Ishii, Y., additional, Abe, Y., additional, Asahi, K., additional, Bostan, M., additional, Chevrier, R., additional, Chikamori, M., additional, Daugas, J. M., additional, Furukawa, T., additional, Nishibata, H., additional, Ichikawa, Y., additional, Ishibashi, Y., additional, Lozeva, R., additional, Miyatake, H., additional, Nagae, D., additional, Nanao, T., additional, Niikura, M., additional, Niwa, T., additional, Okada, S., additional, Ozawa, A., additional, Saito, Y., additional, Shirai, H., additional, Ueno, H., additional, Yordanov, D. T., additional, and Yoshida, N., additional

Published
2016
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116. High-resolution photofission studies with the gamma beam system at ELI-NP.

Author

Choudhury, Deepika, Balabanski, D. L., Krasznahorkay, A., Csige, L., Gulyas, J., Csatlos, M., Constantin, P., and Coban, S.

Subjects
*PHOTOFISSION, *PHOTONUCLEAR reactions, *NUCLEAR reactions, *PHOTODISINTEGRATION, *BANDWIDTHS, *MANAGEMENT
Abstract

The emerging experimental program for photofission research at ELI-NP is briefly summarized. GEANT4 Monte Carlo simulations, providing estimates of the collimated beam profile of the ELI-NP gamma beam: beam energy bandwidth and beam spot dimensions, the required target dimensions, and fission fragment emission rates, their mass and energy distributions, have been reported, which ensure the feasibility of high-resolution studies of the multiple-humped fission barrier. A spectrometer consisting of four ionization chambers coupled to Si strip detectors, called ELI-BIC, is being developed for these measurements, and is briefly discussed. [ABSTRACT FROM AUTHOR]

Published
2017
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118. Spins, Electromagnetic Moments, and Isomers of Cd107-129

Author

Yordanov, D. T., Balabanski, D. L., Bieroń, J., Bissell, M. L., Blaum, K., Budinčević, I., Fritzsche, S., Frömmgen, N., Georgiev, G., Geppert, Ch., Hammen, M., Kowalska, M., Kreim, K., Krieger, A., Neugart, R., Nörtershäuser, W., Papuga, J., Schmidt, S., CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Electromagnetic moments, Shell model, [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], hyperfine structure, Nuclear Theory, spin-orbit effects, Physics::Accelerator Physics, Relativistic corrections, Fine and hyperfine structure, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], fine structure, 21.10.Ky, 21.60.Cs, 32.10.Fn, 31.15.aj
Abstract

The neutron-rich isotopes of cadmium up to the N=82 shell closure have been investigated by high-resolution laser spectroscopy. Deep-uv excitation at 214.5 nm and radioactive-beam bunching provided the required experimental sensitivity. Long-lived isomers are observed in Cd127 and Cd129 for the first time. One essential feature of the spherical shell model is unambiguously confirmed by a linear increase of the 11/2- quadrupole moments. Remarkably, this mechanism is found to act well beyond the h11/2 shell.

Published
2013
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119. Triaxial deformation and nuclear shape transition in Au-192

Author

Oktem, Y., Balabanski, D. L., Akkus, B., Susam, L. Amon, Atanasova, L., Beausang, C. W., and Cakirli, R. B.

Subjects
[Anahtar Kelime Yok], Nuclear Theory
Abstract

WOS:000310970300002 Background: Nuclei in the A approximate to 190 mass region show gradual shape changes from prolate through nonaxial deformed shapes and ultimately towards spherical shapes as the Pb region is approached. Exploring how this shape evolution occurs will help us understand the evolution of collectivity in this region. Purpose: The level scheme of the (192)Aunucleus in A approximate to 190 region was studied in order to deduce its deformations. Methods: High-spin states of Au-192 have been populated in the W-186(B-11, 5n) reaction at a beam energy of 68 MeV and their gamma decay was studied using the YRAST Ball detector array at the Wright Nuclear Structure Laboratory (WNSL), Yale University. Results: Based on double and triple gamma-ray coincidence data the level scheme of 192Au has been extended up to I-pi = 32(+) at an excitation energy of similar to 6 MeV. Conclusion: The results are discussed in the framework of pairing and deformation self-consistent total Routhian surface (TRS) and cranked shell model (CSM) calculations. The comparison of the experimental observations with the calculations indicates that this nucleus takes a nonaxial shape similar to other Au nuclei in this region.

Published
2012

120. Agata-Advanced Gamma Tracking Array

Author

Akkoyun, S., Algora, A., Alikhani, B., Ameil, F., de Angelis, G., Arnold, L., Astier, A., Atac, A., Aubert, Y., Aufranc, C., Austin, A., Aydin, S., Azaiez, F., Badoer, S., Balabanski, D. L., Barrientos, D., Baulieu, G., Baumann, R., Bazzacco, D., and Beck, F. A.

Abstract

The Advanced GAmma Tracking Array (AGATA) is a European project to develop and operate the next generation gamma-ray spectrometer. AGATA is based on the technique of gamma-ray energy tracking in electrically segmented high-purity germanium crystals. This technique requires the accurate determination of the energy, time and position of every interaction as a gamma ray deposits its energy within the detector volume. Reconstruction of the full interaction path results in a detector with very high efficiency and excellent spectral response. The realisation of gamma-ray tracking and AGATA is a result of many technical advances. These include the development of encapsulated highly segmented germanium detectors assembled in a triple cluster detector cryostat, an electronics system with fast digital sampling and a data acquisition system to process the data at a high rate. The full characterisation of the crystals was measured and compared with detector-response simulations. This enabled pulse-shape analysis algorithms, to extract energy, time and position, to be employed. In addition, tracking algorithms for event reconstruction were developed. The first phase of AGATA is now complete and operational in its first physics campaign. In the future AGATA will be moved between laboratories in Europe and operated in a series of campaigns to take advantage of the different beams and facilities available to maximise its science output. The paper reviews all the achievements made in the AGATA project including all the necessary infrastructure to operate and support the spectrometer. (C) 2011 Elsevier B.V. All rights reserved.

Published
2012

121. Coulomb excitation of the 3- isomer in Cu-70

Author

Rapisarda, E, Stefanescu, I, Balabanski, D L, Bastin, B, Blazhev, A, Bree, N, Danchev, M, Bruyneel, B, Davinson, T, Delahaye, P, Diriken, J, Eberth, J, Georgiev, G, Fedorov, D, Fedosseev, V N, Fiori, E, Franchoo, S, Fransen, Ch, Geibel, K, Gladnishki, K, Hadynska, K, Hess, H, Heyde, K, Huyse, M, Ivanov, O, Iwanicki, J, Jolie, J, Kalkuehler, M, Kroll, Th, Krucken, R, Koster, U, Lo Bianco, G, Lozeva, R, Marsh, B A, Nardelli, S, Nowacki, F, Patronis, N, Reiter, P, Seidlitz, M, Sieja, K, Smirnova, N, Srebrny, J, Van de Walle, J, Van Duppen, P, Warr, N, Wenander, F, Wimmer, K, Wrzosek, K, Zemlyanoi, S, and Zielinska, M

Subjects
Nuclear Physics - Experiment
Published
2011

122. Spin, quadrupole moment, and deformation of the magnetic-rotational band head in (193)Pb

Author

Balabanski, D L, Ionescu-Bujor, M, Iordachescu, A, Bazzacco, D, Brandolini, F, Bucurescu, D, Chmel, S, Danchev, M, De Poli, M, Georgiev, G, Haas, H, Hubel, H, Marginean, N, Menegazzo, R, Neyens, G, Pavan, P, Rossi Alvarez, C, Ur, C A, Vyvey, K, and Frauendorf, S

Subjects
Nuclear Theory, Nuclear Physics - Experiment
Abstract

The spectroscopic quadrupole moment of the T(1/2) = 9.4(5) ns isomer in (193)Pb at an excitation energy E(ex) = (2585 + x) keV is measured by the time-differential perturbed angular distribution method as vertical bar Q(s)vertical bar = 2.6(3) e b. Spin and parity I(pi) = 27/2(-) are assigned to it based on angular distribution measurements. This state is the band head of a magnetic-rotational band, described by the coupling of a neutron hole in the 1i(13/2) subshell with the (3s(1/2)(-2)1h(9/2)1i(13/2))(11-) proton excitation. The pairing-plus-quadrupole tilted-axis cranking calculations reproduce the measured quadrupole moment with a moderate oblate deformation epsilon(2) = -0.11, similar to that of the 11(-)proton intruder states, which occur in the even-even Pb nuclei in the region. This is the first direct measurement of a quadrupole moment and thus of the deformation of a magnetic-rotational band head.

Published
2011

123. Simple Nuclear Structure inCd111–129from Atomic Isomer Shifts

Author

Yordanov, D. T., primary, Balabanski, D. L., additional, Bissell, M. L., additional, Blaum, K., additional, Budinčević, I., additional, Cheal, B., additional, Flanagan, K., additional, Frömmgen, N., additional, Georgiev, G., additional, Geppert, Ch., additional, Hammen, M., additional, Kowalska, M., additional, Kreim, K., additional, Krieger, A., additional, Meng, J., additional, Neugart, R., additional, Neyens, G., additional, Nörtershäuser, W., additional, Rajabali, M. M., additional, Papuga, J., additional, Schmidt, S., additional, and Zhao, P. W., additional

Published
2016
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124. Rb-37(97)60

Author

University of Helsinki, Helsinki Institute of Physics, Sotty, C., Zielinska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, R., Das Gupta, S., Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadynska-Klek, K., Kondev, F. G., Konki, J., Kroell, T., Morel, P., Napiorkowski, P., Pakarinen, J., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Toernqvist, H., Warr, N., Wenander, F., University of Helsinki, Helsinki Institute of Physics, Sotty, C., Zielinska, M., Georgiev, G., Balabanski, D. L., Stuchbery, A. E., Blazhev, A., Bree, N., Chevrier, R., Das Gupta, S., Daugas, J. M., Davinson, T., De Witte, H., Diriken, J., Gaffney, L. P., Geibel, K., Hadynska-Klek, K., Kondev, F. G., Konki, J., Kroell, T., Morel, P., Napiorkowski, P., Pakarinen, J., Reiter, P., Scheck, M., Seidlitz, M., Siebeck, B., Simpson, G., Toernqvist, H., Warr, N., and Wenander, F.

Abstract

Excited states of the neutron-rich nuclei Rb-97,Rb- 99 were populated for the first time using the multistep Coulomb excitation of radioactive beams. Comparisons of the results with particle-rotor model calculations provide clear identification for the ground-state rotational band of Rb-97 as being built on the pi g(9/2) [431] 3/2(+) Nilsson-model configuration. The ground-state excitation spectra of the Rb isotopes show a marked distinction between single-particle-like structures below N = 60 and rotational bands above. The present study defines the limits of the deformed region around A similar to 100 and indicates that the deformation of Rb-97 is essentially the same as that observed well inside the deformed region. It further highlights the power of the Coulomb-excitation technique for obtaining spectroscopic information far from stability. The Rb-99 case demonstrates the challenges of studies with very short-lived postaccelerated radioactive beams.

Published
2015

125. Magnetism of an Excited Self-Conjugate Nucleus: Precise Measurement of the g Factor of the 2(1)(+) State in Mg-24

Author

Kusoglu, A., Stuchbery, A. E., Georgiev, G., Brown, B. A., Goasduff, A., Atanasova, L., Balabanski, D. L., Bostan, M., Danchev, M., Detistov, P., Gladnishki, K. A., Ljungvall, J., Matea, I., Radeck, D., Sotty, C., Stefan, I., Verney, D., Yordanov, D. T., Kusoglu, A., Stuchbery, A. E., Georgiev, G., Brown, B. A., Goasduff, A., Atanasova, L., Balabanski, D. L., Bostan, M., Danchev, M., Detistov, P., Gladnishki, K. A., Ljungvall, J., Matea, I., Radeck, D., Sotty, C., Stefan, I., Verney, D., and Yordanov, D. T.

Abstract

A precise measurement of the g factor of the first-excited state in the self-conjugate (N = Z) nucleus Mg-24 is performed by a new time-differential recoil-in-vacuum method based on the hyperfine field of hydrogenlike ions. Theory predicts that the g factors of such states, in which protons and neutrons occupy the same orbits, should depart from 0.5 by a few percent due to configuration mixing and meson-exchange effects. The experimental result, g = 0.538 +/- 0.013, is in excellent agreement with recent shell-model calculations and shows a departure from 0.5 by almost 3 standard deviations, thus achieving, for the first time, the precision and accuracy needed to test theory. Proof of the new method opens the way for wide applications including measurements of the magnetism of excited states of exotic nuclei produced as radioactive beams.

Published
2015

126. Magnetism of an excited self-conjugate nucleus: precise measurement of the g Factor of the 21+State in Mg 24

Author

Kusoglu, A., Stuchbery, A. E., Georgiev, G., Brown, B. A., Goasduff, A., Atanasova, L., Balabanski, D. L., Bostan, M., Danchev, M., Detistov, P., Gladnishki, K. A., Ljungvall, J., Matea, I., Radeck, D., Sotty, C., Stefan, I., Verney, D., Yordanov, D. T., Kusoglu, A., Stuchbery, A. E., Georgiev, G., Brown, B. A., Goasduff, A., Atanasova, L., Balabanski, D. L., Bostan, M., Danchev, M., Detistov, P., Gladnishki, K. A., Ljungvall, J., Matea, I., Radeck, D., Sotty, C., Stefan, I., Verney, D., and Yordanov, D. T.

Abstract

A precise measurement of the g factor of the first-excited state in the self-conjugate (N=Z) nucleus Mg24 is performed by a new time-differential recoil-in-vacuum method based on the hyperfine field of hydrogenlike ions. Theory predicts that the g factors of such states, in which protons and neutrons occupy the same orbits, should depart from 0.5 by a few percent due to configuration mixing and meson-exchange effects. The experimental result, g=0.538±0.013, is in excellent agreement with recent shell-model calculations and shows a departure from 0.5 by almost 3 standard deviations, thus achieving, for the first time, the precision and accuracy needed to test theory. Proof of the new method opens the way for wide applications including measurements of the magnetism of excited states of exotic nuclei produced as radioactive beams.

Published
2015

127. Publisher’s Note:Rb379760: The Cornerstone of the Region of Deformation aroundA∼100[Phys. Rev. Lett.115, 172501 (2015)]

Author

Sotty, C., primary, Zielińska, M., additional, Georgiev, G., additional, Balabanski, D. L., additional, Stuchbery, A. E., additional, Blazhev, A., additional, Bree, N., additional, Chevrier, R., additional, Das Gupta, S., additional, Daugas, J. M., additional, Davinson, T., additional, De Witte, H., additional, Diriken, J., additional, Gaffney, L. P., additional, Geibel, K., additional, Hadyńska-Klek, K., additional, Kondev, F. G., additional, Konki, J., additional, Kröll, T., additional, Morel, P., additional, Napiorkowski, P., additional, Pakarinen, J., additional, Reiter, P., additional, Scheck, M., additional, Seidlitz, M., additional, Siebeck, B., additional, Simpson, G., additional, Törnqvist, H., additional, Warr, N., additional, and Wenander, F., additional

Published
2015
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128. Coulomb excitation and nucleon transfer reactions in the $^{132}$Sn region

Author

Kröll, Th, Von Schmid, M, Pietralla, N, Leske, J, Möller, O, Bauer, C, Stahl, C, Rainovski, G, Krücken, R, Bildstein, V, Wimmer, K, Gernhäuser, R, Nowak, K, Mücher, D, Thirolf, P, Habs, D, Van Duppen, P, Bree, N, Diriken, J, Huyse, M, Roger, T, Pakarinen, J, Voulot, D, Wenander, F, Jungclaus, A, Egido, J L, Orlandi, R, Reiter, P, Warr, N, Blazhev, A, Seidlitz, M, Jolie, J, Albers, M, Scheck, M, Butler, P, Fraile, L M, Van de Walle, J, Görgen, A, Korten, W, Zielinska, M, Cederkäll, J, Georgiev, G, Davinson, T, Woods, P, Jokinen, A, Äystö, J, Grahn, T, Lozeva, R, Simpson, G, Chapman, R, Andreyev, A, Freeman, S, Balabanski, D L, Clement, E, Labiche, M, Ur, C A, and Kruecken, R

Subjects
Detectors and Experimental Techniques
Published
2010

129. Nuclear-structure evolution from $^{68}$Ni towards $^{78}$Ni studied with multiple Coulomb excitation

Author

Van Duppen, P, Wenander, F, Pakarinen, J, Blumenfeld, Y, Davinson, T, Woods, P, Huyse, M, De Witte, H, Raabe, R, Bildstein, V, Gernhäuser, R, Krücken, R, Nowak, K, Wimmer, K, Mücher, D, Kröll, T, Pietralla, N, Rainovski, G, Goergen, A, Korten, W, Obertelli, A, Zielinska, M, Napiorkowski, P, Srebrny, J, Blazhev, A, Jolie, J, Warr, N, Reiter, P, Clément, E, Andreyev, A N, Chapman, B, Harissopulos, S, Lagoyannis, A, Axiotis, M, Mertzimekis, T J, Pakou, A, Van de Walle, J, Georgiev, G, Balabanski, D L, Cederkäll, J, Di Julio, D, and Fahlander, C

Subjects
Detectors and Experimental Techniques
Published
2010

130. Spectroscopy of neutron-rich Ni, Cu and Zn isotopes near $^{68}$Ni and $^{78}$Ni using transfer reactions in inverse kinematics

Author

Orlandi, R, Raabe, R, Bildstein, V, Chapman, R, Diriken, J, Huyse, M, Jungclaus, A, Kroell, T, Kruecken, R, Roger, T, Van Duppen, P, Wimmer, K, Balabanski, D L, Blazhev, A, Bree, N, Butler, P, Cocolios, T, Darby, I G, Daugas, J-M, Davinson, T, de Angelis, G, Elseviers, J, Flanagan, K T, Freeman, S J, Gaudefroy, L, Georgiev, G, Gernhaeuser, R, Hadinia, B, Jenkins, D G, Lunardi, S, Mengoni, D, Pakarinen, J, Pakou, A, Patronis, N, Reiter, P, Robinson, A, Sahin, E, Scheck, M, Simpson, G, Smith, A G, Smith, J F, Valiente Dobon, J J, Warr, N, and Woods, P J

Subjects
Detectors and Experimental Techniques
Published
2010

131. Nuclear g-factor measurement with time-dependent recoil in vacuum in radioactive-beam geometry

Author

Kusoglu, A, primary, Stuchbery, A E, additional, Georgiev, G, additional, Goasduff, A, additional, Atanasova, L, additional, Balabanski, D L, additional, Bostan, M, additional, Danchev, M, additional, Detistov, P, additional, Gladnishki, K, additional, Ljungvall, J, additional, Matea, I, additional, Radeck, D, additional, Sotty, C, additional, Stefan, I, additional, Verney, D, additional, and Yordanov, D T, additional

Published
2015
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132. Magnetism of an Excited Self-Conjugate Nucleus: Precise Measurement of thegFactor of the21+State inMg24

Author

Kusoglu, A., primary, Stuchbery, A. E., additional, Georgiev, G., additional, Brown, B. A., additional, Goasduff, A., additional, Atanasova, L., additional, Balabanski, D. L., additional, Bostan, M., additional, Danchev, M., additional, Detistov, P., additional, Gladnishki, K. A., additional, Ljungvall, J., additional, Matea, I., additional, Radeck, D., additional, Sotty, C., additional, Stefan, I., additional, Verney, D., additional, and Yordanov, D. T., additional

Published
2015
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134. g-factor measurements at RISING: The cases of 127Sn and 128Sn

Author

Atanasova, L., Balabanski, D. L., Chamoli, S. K., Hass, M., Simpson, G., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfutzner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., Wollersheim, H. J., Grawe, H., Hjorth-Jensen, M., Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and RISING

Subjects
nuclear spectroscopy, time-differential perturbed angular distribution, shell model, g-factors, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

We report g-factor measurements for the 19/2+ T1/2 = 4.5(3) µs isomer in 127 Sn and the 10+ T1/2 = 2.69(23) µs isomer in 128 Sn. The experiment was carried out on isomers which were produced and spin-aligned in relativistic heavy-ion fragmentation at GSI and were selected and separated by the GSI fragment separator (FRS). The gamma-rays of the isomer decay were detected by the RISING array. The method of time-differential perturbed angular distribution was utilized. The measured g factors, g(19/2+ ;127 Sn) = -0.17(2) and g(10+ ;128 Sn) = -0.20(4), are compared with shell model calculations. The results demonstrate the feasibility of the method for similar measurements in exotic neutron-rich nuclei.

Published
2010
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135. Tilted-foils polarization at REX-ISOLDE

Author

Georgiev, G, Hass, M, Herlert, A, Balabanski, D L, Fiori, E, Gustafsson, A, Hemmingsen, L, Imielski, P, Johnston, K, Lindroos, M, Lozeva, R, Riisager, K, Stachura, M, Van de Walle, J, Voulot, D, Wenander, F, and Zeitz, W-D

Subjects
Detectors and Experimental Techniques
Published
2009

136. Nuclear structure studies of the neutron-rich Rubidium isotopes using Coulomb excitation

Author

Georgiev, G, Daugas, J M, Simpson, G, Balabanski, D L, Blazhev, A, Bucurescu, D, Das-Gupta, S, Faul, T, Filipescu, D, Fiori, E, Gaudefroy, L, Ghita, D, Hass, M, Hauschild, K, Jenkins, D, Köster, U, Kroel, T, Kumar, V, Lo Bianco, G, Marginean, N, López-Martens, A, Mihai, C, Lozeva, R, Méot, V, Mücher, D, Reiter, P, Roberts, O, Roig, O, Seidlitz, M, Singh, K, Stuchbery, A, Voulot, D, Van de Walle, J, Warr, N, Wenander, F, and Wendt, A

Subjects
Detectors and Experimental Techniques
Published
2009

137. Revision of the K-Isomer in 190W

Author

Farrelly, G. F., Zs. Podolyak, Steer, S. J., Pietri, S., Xu, F. R., Werner-Malento, E., Shizuma, T., Regan, P. H., Dirk Rudolph, Garnsworthy, A. B., Robert Hoischen, Gorska, M., Gerl, J., Wollersheim, H. J., Kurtukian-Nieto, T., Benzoni, G., Becker, F., Bednarczyk, P., Caceres, L., Doornenbal, P., Geisserl, H., Grebosz, J., Kelic, A., Kojouharov, I., Kurz, N., Montes, F., Prokopowicz, W., Saito, T., Schaffner, H., Tashenov, S., Heinz, A., Pfuezner, M., Jungclaus, A., Balabanski, D. L., Brandau, C., Bruce, A. M., Catford, W. N., Cullen, I. J., Zs. Dombradi, Estevez, E., Gelletly, W., Ilie, G., Jolie, J., Jones, G. A., Kmiecik, M., Kondev, F. G., Kruecken, R., Lalkovski, S., Liu, H. L., Liu, Z., Maj, A., Myalski, S., Schwerrel, S., Walker, P. M., and Wieland, O.

Subjects
Subatomic Physics, Nuclear Experiment
Abstract

Gamma rays from the decay of an isomer in W-190(116) have been observed following projectile fragmentation of a 1 GeV per nucleon Pb-208 beam. An earlier experiment indicated decay from a (10(-)) isomer to the ground state rotational band. Improved statistics have enabled gamma coincidence and time-difference measurements to be made which alter the previous interpretation. Blocked BCS calculations have also been used together with reduced hindrance factors to indicate possible values of spin-parity for the isomer.

Published
2009

138. Interplay between Single-Particle and Collective Effects in the Odd-A Cu Isotopes beyond N=40

Author

Stefanescu, I., Georgiev, G., Balabanski, D. L., Blasi, N., Blazhev, A., Bree, N., Cederk?ll, J., Cocolios, T. E., Davinson, T., Diriken, J., Eberth, J., Ekstr?m, A., Fedorov, D., Fedosseev, V. N., Fraile, L. M., Franchoo, S., Gladnishki, K., Huyse, M., Ivanov, O., Ivanov, V., Iwanicki, J., Jolie, J., Konstantinopoulos, T., Kr?ll, Th, Kr?cken, R., K?ster, U., Lagoyannis, A., Lo Bianco, G., Maierbeck, P., Marsh, B. A., Napiorkowski, P., Patronis, N., Pauwels, D., Rainovski, G., Reiter, P., Riisager, K., Seliverstov, M., Sletten, G., Van de Walle, J., Van Duppen, P., Voulot, D., Warr, N., Wenander, F., Wrzosek, K., Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 25.70.De, 21.10.Ky, 21.60.Cs, 27.50.+e
Abstract

Collective properties of the low-lying levels in the odd-A 67-73Cu were investigated by Coulomb excitation with radioactive beams. The beams were produced at ISOLDE and postaccelerated by REX-ISOLDE up to 2.99 MeV/u. In 67,69Cu, low-lying 1/2(-), 5/2(-), and 7/2(-) states were populated. In 71,73Cu, besides the known transitions deexciting the single-particle-like 5/2(-) and core-coupled 7/2(-) levels, gamma rays of 454 and 135 keV, respectively, were observed for the first time. Based on a reanalysis of beta-decay work and comparison with the systematics, a spin 1/2(-) is suggested for these excited states. Three B(E2) values were determined in each of the four isotopes. The results indicate a significant change in the structure of the odd-A Cu isotopes beyond N=40 where single-particle-like and collective levels are suggested to coexist at very low excitation energies.

Published
2008
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139. New sub-\mu s isomers in 125,127,129Sn and isomer systematics of 124-130 Sn

Author

Lozeva, R. L., Simpson, G. S., Grawe, H., Neyens, G., Atanasova, L. A., Balabanski, D. L., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Daugas, J.-M., Detistov, P., Rydt, M., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K. A., Gorska, M., Grebosz, J., Hass, M., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jolie, J., Jungclaus, A., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S. P., Lo Bianco, G., Mallion, S., Maj, A., Montanari, D., Perru, O., Pfützner, M., Pietri, S., Pinston, J. A., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saitoh, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Tashenov, S., Turzo, K., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., and Wollersheim, H.-J.

Subjects
shell model, isomers, Nuclear structure, radioactive ion beams
Abstract

New sub-\mu s isomers have been observed in the neutron-rich Sn isotopes. 125,127,129Sn nuclei have been produced in a relativistic fission reaction of 238U on a 9Be target at 750 A MeV and by the fragmentation of 136Xe at 600 A MeV populating high-spin yrast states. In addition to the already known \mu s isomers, three new ones -1 with sub-\mu s half-lives have been observed. These yrast isomers are the high-spin members of the \nu (d_3/2^-1 h_11/2^-2 ) and \nu h_11/2 ^-n, seniority v = 3 multiplets leading to isomeric (23/2+) and (27/2-) states, respectively. Added to the already known 19/2+ \mu s isomers in this region the current work completes the systematic information of neutron-hole excitations toward the filling of the last h_11/2 orbital a t N = 82. The results are discussed in the framework of state-of-the -art shell-model calculations using realistic interactions.

Published
2008

140. First isomeric quadrupole moment measured in fragmentation reactions: The case of $^{61}$Fe$^{m}(9/2^{+})$

Author

Vermeulen, N, Chamoli, S K, Daugas, J M, Hass, M, Balabanski, D L, Delaroche, J P, De Oliveira-Santos, F, Georgiev, G, Girod, M, Goldring, G, Goutte, H, Grévy, S, Matea, I, Morel, P, Nara-Singh, B S, Penionzkevich, Yu E, Perrot, L, Perru, O, Péru, S, Roig, O, Sarazin, F, Simpson, G S, Sobolev, Yu, Stefan, I, Stodel, C, Yordanov, D T, and Neyens, G

Subjects
Nuclear Physics - Experiment
Published
2007

142. g-factor measurements at RISING: the case of 127Sn

Author

Atanasova, L., Balabanski, D. L., Hass, M., Bazzacco, D., Becker, F., Bednarczyk, P., Benzoni, G., Blasi, N., Blazhev, A., Bracco, A., Brandau, C., Caceres, L., Camera, F., Chamoli, S. K., Crespi, F. C. L., Detistov, P., Doornenbal, P., Fahlander, C., Farnea, E., Georgiev, G., Gerl, J., Gladnishki, K., Gorska, M., Grawe, H., Grebosz, J., Hoischen, R., Ilie, G., Ionescu-Bujor, M., Iordachescu, A., Jungclaus, A., Lo Bianco, G., Kmiecik, M., Kojouharov, I., Kurz, N., Lakshmi, S., Lozeva, R., Maj, A., Montanari, D., Neyens, G., Pfützner, M., Pietri, S., Podolyak, Z., Prokopowicz, W., Rudolph, D., Rusev, G., Saito, T. R., Saltarelli, A., Schaffner, H., Schwengner, R., Simpson, G., Tashenov, S., Valiente-Dobon, J. J., Vermeulen, N., Walker, J., Werner-Malento, E., Wieland, O., and Wollersheim, H. J.

Published
2006

143. Quadrupole moment of the 8+ yrast state in 84Kr

Author

Schwengner, R., Balabanski, D. L., Neyens, G., Benouaret, N., Borremans, D., Coulier, N., Rydt, M., Georgiev, G., Mallion, S., Rainovski, G., Rusev, G., Teughels, S., and Vyvey, K.

Subjects
level-mixing spectroscopy, nuclear quadrupole moments, shell model, Nuclear structure
Abstract

The quadrupole moment of the 8+ yrast state in 84Kr was measured using the level-mixing spectroscopy technique to be Q = 36(4) efm2. The result is compared with predictions of the shell model using common sets of effective charges. The comparison of experimental quadrupole moments with calculated values for 8+ states in Kr, Sr and Zr isotopes with N = 48, 50 and for 9/2+ states in isotopes with N = 47, 49 suggests a modification of the effective charges used in this region.

Published
2006

144. Transition Probabilities in $^{134}$Pr: A Test for Chirality in Nuclear Systems

Author

Tonev, D., DE ANGELIS, G., Petkov, P., Dewald, A., Brant, S., Frauendorf, S., Balabanski, D. L., Pejovic, P., Bazzacco, D., Bednarczyk, P., Camera, F., Fitzler, A., Gadea, A., Lenzi, SILVIA MONICA, Lunardi, Santo, Marginean, N., Mller, O., Napoli, D. R., Paleni, A., Petrache, C. M., Prete, G., Zell, K. O., Zhang, Y. H., JING YE ZHANG, Zhong, Q., Curien, AND D., Institut de Recherches Subatomiques (IReS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)

Subjects
nuclei with mass number 90 to 149, nuclear energy level transitions, chirality, 21.10.Tg, 11.30.Rd, 23.20.-g, 27.60.+j, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NATURAL SCIENCES. Physics, transition probabilities, PRIRODNE ZNANOSTI. Fizika, interacting boson approximation, 134Pr, heavy ion fusion reactions, nuclear collective states, chiral symmetries, Nuclear Experiment, nuclear collective model, nuclear shape
Abstract

Exited states in $^{134}$Pr were populated in the fusion-evaporation reaction $^{119}Sn(^{19}F,4n)^{134}$Pr. Recoil distance Doppler-shift and Doppler-shift attenuation measurements using the Euroball spectrometer, in conjunction with the inner Bismuth Germanate ball and the Cologne plunger, were performed at beam energies of 87 MeV and 83 MeV, respectively. Reduced transition probabilities in $^{134}$Pr are compared to the predictions of the two quasiparticle+triaxial rotor and interacting boson fermion-fermion models. The experimental results do not support the presence of static chirality in $^{134}$Pr underlying the importance of shape fluctuations. Only within a dynamical context the presence of intrinsic chirality in $^{134}$Pr can be supported

Published
2006
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145. Lifetime measurements in Pr-134 and chirality in nuclei

Author

Tonev, D., Petkov, P., Balabanski, D. L., De Angelis, G., Gadea, A., Napoli, D. R., Marginean, N., Dewald, A., Pejovic, P., Fitzler, A., Moeller, O., Zell, K. O., Brant, S., Frauendorf, S., Bazzacco, D., Lenzi, SILVIA MONICA, Lunardi, Santo, Bednarczyk, P., Curien, D., Petrache, C., Zhong, Q., Zhang, Y. H., and Zhang Jing Ye

Published
2006

146. New measurement and reevaluation of the nuclear magnetic and quadrupole moments of $^{8}$Li and $^{9}$Li

Author

Borremans, D, Balabanski, D L, Gheysen, S, Himpe, P, Mallion, S, Neyens, G, Vermeulen, N, Yordanov, D, Blaum, K, Geithner, W, Kowalska, M, Lassen, J, Neugart, R, and Lievens, P

Subjects
Particle Physics - Experiment
Abstract

The nuclear magnetic moment of $^{9}$Li and the quadrupole moments of $^{8}$Li and $^{9}$Li have been measured using $\beta$-asymmetry detection of nuclear magnetic resonance ($\beta$-NMR) on optically polarized beams at ISOLDE/CERN. The radioactive beams were implanted in Si for g factor measurements and in Zn, LiNbO$_{3}$, and LiTaO$_{3}$ crystals for quadrupole moment measurements. The electric field gradient V$_{zz}$ = 4.26(4) $\times$10$^{15}$ V/cm$^{2}$ is deduced for Li in Zn. Using a recently adopted reference value Q($^{7}$Li) = -40.0(3) mb, we reevaluated all earlier reported nuclear quadrupole moments of $^{8}$Li and $^{9}$Li. Based on all available previous and present data, the adopted quadrupole moments for these isotopes are Q($^{8}$Li) = +31.4(2) mb and Q($^{9}$Li) = - 30.6(2) mb. The magnetic moment of $^{9}$Li is deduced as $\mu(^{9}$Li) = 3.43678(6)$\mu\scriptstyle_\textrm{N}$ . The values are compared to predictions from shell-model and cluster-model calculations.

Published
2005

147. PROSPECTIVES OF PHOTOFISSION STUDIES WITH HIGH-BRILLIANCE NARROW-WIDTH GAMMA BEAMS AT THE NEW ELI-NP FACILITY.

Author

CHOUDHURY, DEEPIKA, BALABANSKI, D. L., KRASZNAHORKAY, A., CSIGE, L., GULYAS, J., CSATLOS, M., CONSTANTIN, P., and COBAN, S.

Subjects
*PHOTOFISSION, *ACTINIDE elements, *COLLIMATED light, *BANDWIDTHS, *COMPUTER simulation, *IONIZATION chambers
Abstract

Simulations providing estimates of the ELI-NP gamma-beam energy bandwidths and beam spot dimensions for the collimated beams, and expected fission rates with the narrow-width beams of bandwidth 0.3% and 0.5% on actinide targets, 238U and 232Th, are reported. These estimates support the feasibility of precise transmission resonance measurements with the narrow-width ELI-NP γ beams. The status of the design and construction of a state-of-the-art experimental array, consisting of four double-sided, Frisch-gridded Bragg ionization chambers, coupled to ΔE-E detectors, is reported. [ABSTRACT FROM AUTHOR]

Published
2017
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148. Capture and photonuclear reaction rates involving charged-particles: Impacts of nuclear ingredients and future measurement on ELI-NP.

Author

Xu, Y., Goriely, S., Balabanski, D. L., Chesnevskaya, S., Guardo, G. L., Cognata, M. La, Lan, H. Y., Lattuada, D., Luo, W., and Matei, C.

Subjects
NEUTRON capture, PHOTONUCLEAR reactions, NUCLEAR astrophysics, HEAVY nuclei, NUCLEAR structure
Abstract

The astrophysical p-process is an important way of nucleosynthesis to produce the stable and protonrich nuclei beyond Fe which can not be reached by the s- and r-processes. In the present study, the impact of nuclear ingredients, especially the nuclear potential, level density and strength function, to the astrophysical reaction rates of (p,γ), (α,γ), (γ,p), and (γ,α) reactions are systematically studied. The calculations are performed basad on the modern reaction code TALYS for about 3000 stable and proton-rich nuclei with 12⩽Z⩽110. In particular, both of the Wood-Saxon potential and the microscopic folding potential are taken into account. It is found that both the capture and photonuclear reaction rates are very sensitive to the nuclear potential, thus the better determination of nuclear potential would be important to reduce the uncertainties of reaction rates. Meanwhile, the Extreme Light Infrastructure-Nuclear Physics (ELI-NP) facility is being developed, which will provide the great opportunity to experimentally study the photonuclear reactions in p-process. Simulations of the experimental setup for the measurements of the photonuclear reactions 96Ru(γ,p) and 96Ru(γ,α) are performed. It is shown that the experiments of photonuclear reactions in p-process based on ELI-NP are quite promising. [ABSTRACT FROM AUTHOR]

Published
2018
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149. Highly deformed Bands in 175Hf

Author

Scholes, D. T., Cullen, D. M., Kondev, F. G., Janssens, R. V. F., Carpenter, M. P., Hartley, D. J., Djongolov, M. K., Sletten, G., Hagemann, G., Wheldon, C., Walker, P. M., Saleem, K. Abu, Ahmad, I., Balabanski, D. L., Chowdhury, P., Danchev, M., Dracoulis, G. D., El-Masri, H. M., Goon, J., Heinz, A., Kaye, R. A., Khoo, T. L., Lauritsen, T., Lister, C. J., Moore, E. F., Riedinger, L. L., Riley, M.A., Seweryniak, M., Shestakova, I., Wiedenhöver, I., Zeidan, O., and Zhang, Jing-ye

Published
2004

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