New results on mass measurements of stored neutron-rich nuclides in the element range from Pt to U with the FRS-ESR facility at 360-400 MeV/u

被引：65

作者：

Chen, L. ^{[1
,2
]}

Plass, W. R. ^{[1
,2
]}

Geissel, H. ^{[1
,2
]}

Knoebel, R. ^{[1
]}

Kozhuharov, C. ^{[1
]}

Litvinov, Yu A. ^{[1
]}

Patyk, Z. ^{[3
]}

Scheidenberger, C. ^{[1
,2
]}

Siegien-Iwaniuk, K. ^{[3
]}

Sun, B. ^{[1
,4
]}

Weick, H. ^{[1
]}

Beckert, K. ^{[1
]}

Beller, P. ^{[1
]}

Bosch, F. ^{[1
]}

Boutin, D. ^{[1
]}

Caceres, L. ^{[1
]}

Carroll, J. J. ^{[5
]}

Cullen, D. M. ^{[6
]}

Cullen, I. J. ^{[7
]}

Franzke, B. ^{[1
]}

Gerl, J. ^{[1
]}

Gorska, M. ^{[1
]}

Jones, G. A. ^{[7
]}

Kishada, A. ^{[6
]}

Kurcewicz, J. ^{[1
]}

Litvinov, S. A. ^{[1
]}

Liu, Z. ^{[7
]}

Mandal, S. ^{[1
]}

Montes, F. ^{[8
]}

Muenzenberg, G. ^{[1
]}

Nolden, F. ^{[1
]}

Ohtsubo, T. ^{[9
]}

Podolyak, Zs ^{[7
]}

Propri, R. ^{[5
]}

Rigby, S. ^{[6
]}

Saito, N. ^{[1
]}

Saito, T. ^{[1
]}

Shindo, M. ^{[10
]}

Steck, M. ^{[1
]}

Walker, P. M. ^{[7
]}

Williams, S. ^{[7
]}

Winkler, M. ^{[1
]}

Wollersheim, H. -J. ^{[1
]}

Yamaguchi, T. ^{[11
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[2] Univ Giessen, D-35392 Giessen, Germany

[3] Natl Ctr Nucl Res, PL-00681 Warsaw, Poland

[4] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China

[5] Youngstown State Univ, Youngstown, OH 44555 USA

[6] Univ Manchester, Manchester M13 9PL, Lancs, England

[7] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England

[8] Michigan State Univ, E Lansing, MI 48824 USA

[9] Niigata Univ, Dept Phys, Niigata 9502181, Japan

[10] Univ Tokyo, Dept Phys, Tokyo 1130033, Japan

[11] Saitama Univ, Dept Phys, Saitama 3388570, Japan

来源：

NUCLEAR PHYSICS A | 2012年 / 882卷

关键词：

NUCLEAR REACTIONS Be-9(U-238; f); E=670 MeV/nucleon; measured reaction fragments using fragment separator; fragment mass using SMS (Schottky Mass Spectrometry); calculated mass excess using existing theoretical models; deduced neutron-rich exotic fragment mass using FFT analysis of Schottky frequency spectra and pattern recognition algorithm; mass excess; systematic deviations up to 1500 keV from modern mass models; Compared with AME03 mass tables; EXOTIC NUCLEI; PROJECTILE FRAGMENTS; FUTURE EXPERIMENTS; STORAGE; SPECTROMETRY;

D O I：

10.1016/j.nuclphysa.2012.03.002

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Masses of U-238 projectile fragments have been measured with time-resolved Schottky Mass Spectrometry (SMS) at the FRS-ESR facility at GSI. The exotic nuclei were created in the production target at the entrance of the fragment separator FRS, spatially separated in flight and injected into the storage-cooler ring ESR at about 70% light velocity. This means the ions were mainly bare or carried only a few electrons, e.g., the population of Li-like ions was below 1% for Pt fragments. Accurate new mass values of 33 neutron-rich, stored exotic nuclei in the element range from platinum to uranium have been obtained for the first time. In total more than 150 nuclides including references with well-known masses have been covered in this large-area SMS measurement. A novel data analysis has been applied which reduces the systematic errors by taking into account the velocity profile of the cooler electrons and the residual ion-optical dispersion in this part of the storage ring. The experiment, the data analysis, and the mass values are presented. The experimental data are compared with theoretical predictions demonstrating systematic deviations of up to 1500 keV from modern mass models. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：71 / 89

页数：19

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