Penning-trap mass spectrometry of highly charged, neutron-rich Rb and Sr isotopes in the vicinity of A ≈ 100

被引：33
|
作者：
Simon, V. V. [1 ,2 ,3 ]
Brunner, T. [1 ,4 ]
Chowdhury, U. [1 ,5 ]
Eberhardt, B. [1 ]
Ettenauer, S. [1 ,6 ]
Gallant, A. T. [1 ,6 ]
Mane, E. [1 ]
Simon, M. C. [1 ]
Delheij, P. [1 ]
Pearson, M. R. [1 ]
Audi, G. [7 ]
Gwinner, G. [5 ]
Lunney, D. [7 ]
Schatz, H. [8 ]
Dilling, J. [1 ,6 ]
机构：
[1] TRIUMF, Vancouver, BC V6T 2A3, Canada
[2] Heidelberg Univ, Dept Phys & Astron, D-69120 Heidelberg, Germany
[3] Max Planck Inst Nucl Phys, D-69117 Heidelberg, Germany
[4] Tech Univ Munich, Phys Dept E12, D-85748 Garching, Germany
[5] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada
[6] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada
[7] Univ Paris 11, IN2P3, CSNSM, Orsay, France
[8] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA
来源：
PHYSICAL REVIEW C | 2012年 / 85卷 / 06期
基金：
加拿大自然科学与工程研究理事会;
关键词：
HIGH-PRECISION; ACCURACY; EVOLUTION; ZR; OPERATION; ENERGIES; FACILITY; RUBIDIUM; STATE; MO;
D O I：
10.1103/PhysRevC.85.064308
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：
The neutron-rich mass region around A approximate to 100 presents challenges for modeling the astrophysical r process because of rapid shape transitions. We report on mass measurements using the TITAN Penning trap at TRIUMF-ISAC to attain more reliable theoretical predictions of r-process nucleosynthesis paths in this region. A new approach using highly charged (q = 15+) ions has been applied which considerably saves measurement time and preserves accuracy. New mass measurements of neutron-rich Rb-94,Rb-97,Rb-98 and Sr-94,Sr-97-99 have uncertainties of less than 4 keV and show deviations of up to 11 sigma when compared to previous measurements. An analysis using a parameterized r-process model is performed and shows that mass uncertainties for the A = 90 abundance region are eliminated.
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页数：11
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