131106858
Isomer and beta decay spectroscopy in the 132Sn region with EURICA
A. Jungclaus et al.; 4 pags.; 1 fig.; Open Access funded by Creative Commons Atribution Licence 2.0
15843852
Shape evolution in 116,118Ru: Triaxiality and transition between the O(6) and U(5) dynamical symmetries
P.-A. Söderström,1,* G. Lorusso,1 H. Watanabe,1,2 S. Nishimura,1 P. Doornenbal,1 G. Thiamova,3 F. Browne,1,4 G. Gey,1,3 H. S. Jung,5 T. Sumikama,6 J. Taprogge,1,7,8 Zs. Vajta,1,9 J. Wu,1,10 Z. Y. Xu,11 H. Baba,1 G. Benzoni,12 K. Y. Chae,13 F. C. L. Crespi,12,14 N. Fukuda,1 R. Gernhäuser,15 N. Inabe,1 T. Isobe,1 A. Jungclaus,8 D. Kameda,1 G. D. Kim,16 Y.-K. Kim,16,17 I. Kojouharov,18 F. G. Kondev,19 T. Kubo,1 N. Kurz,18 Y. K. Kwon,16 G. J. Lane,20 Z. Li,21 A. Montaner-Pizá,22 K. Moschner,23 F. Naqvi,24 M. Niikura,11 H. Nishibata,25 A. Odahara,25 R. Orlandi,26 Z. Patel,27 Zs. Podolyák,27 H. Sakurai,1,11 H. Schaffner,18 G. S. Simpson,3 K. Steiger,15 H. Suzuki,1 H. Takeda,1 A. Wendt,23 A. Yagi,25 and K. Yoshinaga28 1RIKEN Nishina Center, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan 2Department of Physics, Beihang University, Beijing 100191, China 3LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France 4School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4JG, United Kingdom 5Department of Physics, Chung-Ang University, Seoul 156-756, Republic of Korea 6Department of Physics, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan 7Departamento de Fı́sica Teórica, Universidad Autónoma de Madrid, E-28049 Madrid, Spain 8Instituto de Estructura de la Materia, CSIC, E-28006 Madrid, Spain 9Institute for Nuclear Research, Hungarian Academy of Sciences, P. O. Box 51, Debrecen, H-4001, Hungary 10Department of Physics, Peking University, Beijing 100871, China 11Department of Physics, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 12INFN Sezione di Milano, I-20133 Milano, Italy 13Department of Physics, Sungkyunkwan University, Suwon 440-746, Republic of Korea 14Dipartimento di Fisica, Università di Milano, I-20133 Milano, Italy 15Physik Department E12, Technische Universität München, D-85748 Garching, Germany 16Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811, Republic of Korea 17Department of Nuclear Engineering, Hanyang University, Seoul 133-791, Republic of Korea 18GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany 19Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 20Department of Nuclear Physics, R.S.P.E., Australian National University, Canberra, A.C.T. 0200, Australia 21School of Physics, Peking University, Beijing 100871, China 22Instituto de Fı́sica Corpuscular, CSIC-University of Valencia, E-46980 Paterna, Spain 23Institut für Kernphysik, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany 24Wright Nuclear Structure Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA 25Department of Physics, Osaka University, Machikaneyama-machi 1-1, Toyonaka, Osaka 560-0043, Japan 26Instituut voor Kern en Stralingsfysica, KU Leuven, University of Leuven, B-3001 Leuven, Belgium 27Department of Physics, University of Surrey, Guildford GU2 7XH, United Kingdom 28Department of Physics, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
119889808
Schottky Mass Measurements of Cooled Proton-Rich Nuclei at the GSI Experimental Storage Ring
High-precision mass measurements of proton-rich isotopes in the range of 60{le}Z{le}84 were performed using the novel technique of Schottky spectrometry. Projectile fragments produced by {sup 209}Bi ions at 930{ital A} MeV were separated with the magnetic spectrometer FRS and stored and cooled in the experimental storage ring (ESR). A typical mass resolving power of 350000 and a precision of 100keV were achieved in the region A{approx}200 . Masses of members of {alpha} chains linked by precise Q{sub {alpha}} values but not yet connected to the known masses were determined. In this way it is concluded that {sup 201}Fr and {sup 197}At are proton unbound. {copyright} {ital 1997} {ital The American Physical Society}
109826413
Pre-installation tests and calibration of the ALICE TOF modules
Abstract Before installation into the ALICE experiment, all 87 modules of the TOF system had to undergo a series of tests. Initial check-ups included control of the gas tightness, readout connections quality, and high-voltage tests. Further tests were performed on a specially constructed Cosmic Ray Test Facility, where main characteristics of the modules were scanned under the working high voltage by means of cosmic muons. All TOF channels proved to provide the detection efficiency of more than 97% and time resolution of 80–110 ps, which complies with the ALICE requirements.
108880980
A topological trigger based on the Time-of-Flight detector for the ALICE experiment
The goal of the ALICE Time-of-Flight detector, based on MRPC technology, is to perform the charged-particle identification at midrapidity, in the region |η| < 0.9. This large area (∼150 m 2 ), finely segmented detector (∼157,000 channels), provides fast signals which will contribute to the Level 0 and Level 1 trigger decisions. We use the TOF detector information to perform an online estimate of the total track multiplicity and to identify simple and peculiar topologies, like those produced by minimum bias p-p, Ultra Peripheral ion-ion collisions and cosmic muons. The system architecture foresees a first layer of 72 VME boards interfacing the detector front-end to a second layer, which receives and processes all the information and takes trigger decisions.
16382276
Multiplicity studies and effective energy in ALICE at the LHC
In this work we explore the possibility to perform “effective energy” studies in very high energy collisions at the CERN large hadron collider (LHC). In particular, we focus on the possibility to measure in pp collisions the average charged multiplicity as a function of the effective energy with the ALICE experiment, using its capability to measure the energy of the leading baryons with the zero degree calorimeters. Analyses of this kind have been done at lower centre-of-mass energies and have shown that, once the appropriate kinematic variables are chosen, particle production is characterized by universal properties: no matter the nature of the interacting particles, the final states have identical features. Assuming that this universality picture can be extended to ion–ion collisions, as suggested by recent results from RHIC experiments, a novel approach based on the scaling hypothesis for limiting fragmentation has been used to derive the expected charged event multiplicity in AA interactions at LHC. This leads to scenarios where the multiplicity is significantly lower compared to most of the predictions from the models currently used to describe high energy AA collisions. A mean charged multiplicity of about 1000–2000 per rapidity unit (at η∼0) is expected for the most central Pb–Pb collisions at $\sqrt{s_{{\text{NN}}}} = 5.5\,\text{TeV}$.