Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 898, Issue -, Pages 111-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nima.2018.04.056
Keywords
Nuclear mass measurements; Isochronous mass spectrometry; Heavy-ion storage rings; Transition energy
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Funding
- National Key R&D Program of China [2016YFA0400504]
- NSFC [11605252, U1232208, U1432125, 11205205, 11035007, 11605248]
- Helmholtz-CAS Joint Research Group [HCJRG-108]
- External Cooperation Program of the CAS [GJHZ1305]
- 973 Program of China [2013CB834401]
- European Research Council (ERC) under the European Union [682841]
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The Isochronous Mass Spectrometry (IMS) is a powerful technique developed in heavy-ion storage rings for measuring masses of very short-lived exotic nuclei. The IMS is based on the isochronous setting of the ring. One of the main parameters of this setting is the transition energy gamma(t). It has been a challenge to determine the gamma(t) and especially to monitor the variation of gamma(t) during experiments. In this paper we introduce a method to measure the gamma(t) online during IMS experiments by using the acquired experimental data. Furthermore, since the storage ring has (in our context) a relatively large momentum acceptance, the variation of the gamma(t) across the ring acceptance is a source of systematic uncertainty of measured masses. With the installation of two time-of-flight (TOF) detectors, the velocity of each stored ion and its revolution time are simultaneously available for the analysis. These quantities enabled us to determine the gamma(t) as a function of orbital length in the ring. The presented method is especially important for future IMS experiments planned at the new-generation storage ring facilities FAIR in Germany and HIAF in China.
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