27.10.2016; Vortrag
Seminar: Neutron-rich isotopes and recent-developments at ISOLTRAP to pure radio-nuclide samples for cancer treatment and diagnostic
D-01069 Dresden
Abstract
The ISOLTRAP [1] setup is a high-precision Penning-trap experiment at ISOLDE/CERN [2]. During the three decades of operation, a large amount of precision mass measurements have been performed covering a wide range of research areas from fundamental nuclear structure to nucleosynthesis studies. To cope with the more and more demanding measurement conditions, the experimental setup has been improved and updated continuously [3].
A high-resolution multi-reflection time-of-flight mass spectrometer (MR-ToF MS) [4] is now routinely used for the beam purification and for mass measurements of short-living nuclides. Recently, a position-sensitive ion detector was installed behind the precision Penning-trap. This will allow the application of the Phase-Imaging Ion-Cyclotron-Resonance (PI-ICR) method, a development from SHIPTRAP/GSI [5]. The new technique offers a five times higher precision, in less measurement time as well as a much higher resolving power, by factor 40, compared to the present Time-of-Flight Ion-Cyclotron-Resonance (ToF-ICR) technique [6]. Furthermore, a decay station has been installed after the MR-ToF MS for trap assisted-decay spectroscopy on purified samples. With these new features ISOLTRAP will be able to achieve better selectivity and improve the discrimination between ground states and isomeric states.
Besides the technological achievements and developments, the presentation will cover recent measurements related to nuclear structure and astrophysics. The focus will be on the measurement of neutron-rich 129-131Cd isotopes [7], which confirms the existence of the N = 82 magic number and improves the input-data basis for r-process nucleosynthesis simulations in this part of the nuclide chart. Results concerning shape coexistence in the region between N = 82 and N = 126 will be shown for the 13/2+ excited states of the 195,197Po nuclides, which were measured for the first time. Additionally, a very recent measurement of neutron-rich copper isotopes up to 79Cu will be discussed.
To close the session a small outlook about radio-nuclide production for medical purposes at ISOLDE, namely 149,152,155,161Tb [8], in relation with ISOLTRAP’s MR-ToF MS will be presented.
References:
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[2] E. Kugler, Hyperfine Interact. 129, 23 (2000).
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[4] R.N. Wolf et al., Nucl. Instrum. Meth. A 686, 82 (2012); R.N. Wolf et al., Int. J. Mass Spectrom. 349, 123 (2013).
[5] S. Eliseev et al., Phys. Rev. Lett.110, 082501 (2013); S. Eliseev et al., Appl. Phys. B 114, 107 (2013).
[6] M. König et al., Int. J. Mass Spectrom. Ion. Process 142, 95 (1995).
[7] D. Atanasov et al., Phys. Rev. Lett. 115, 232501 (2015).
[8] C. Müller et al., J. Nucl. Med. 53, 1951 (2012).