Stopped, bunched beams for the TwinSol facility
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Stopped, bunched beams for the TwinSol facility A. A. Valverde1,2 · M. Brodeur2 · D. P. Burdette1,2 · J. A. Clark1,3 · J. W. Klimes1,2 · D. Lascar1,4 · P. D. O’Malley2 · R. Ringle5 · G. Savard1,6 · V. Varentsov7,8
© Springer Nature Switzerland AG 2019
Abstract Tests of the unitarity of the Cabbibo-Kobayashi-Masakawa (CKM) matrix offer an important avenue for constraining the Standard Model of the electroweak interaction. Several methods are currently used to determine Vud , the largest element in the top-row normalization test. One such method is through the study of superallowed T = 1/2 mixed mirror transitions, which offers a complementary method to the current most-precise value that is determined from superallowed pure Fermi 0+ → 0+ transitions. The precision currently achievable by this method is currently limited by the very low number of transitions for which the Fermi-to-Gamow-Teller mixing ratio ρ has been measured. St. Benedict, the Superallowed Transition Beta-Neutrino Decay-Ion-Coincidence Trap, is currently under development at the University of Notre Dame’s Nuclear Science Laboratory, and intends to determine ρ for a range of new isotopes through measurements of the β-neutrino asymmetry parameter aβν using a linear Paul trap. In order to trap these ions, the fast, continuous secondary beam separated by the TwinSol twin solenoid separator must be thermalized and bunched. The system through which this will be done will feature a large-volume gas cell in which the ions will be thermalized, a double-RF-funnel-based ion guide system for the extraction of the ions, and a radiofrequency quadrupole (RFQ) to provide cooled ion bunches for capture in the Paul trap. Keywords Fundamental symmetries · Ion trapping · Mirror transitions · Radioactive ion beams · RFQ · Beam cooling
1 Introduction Testing the unitarity of the Cabbibo-Kobayashi-Masakawa (CKM) matrix offers an important avenue for constraining physics beyond the Standard Model. Several methods are used This article is part of the Topical Collection on Proceedings of the 7th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2018), Traverse City, Michigan, USA, 30 September-5 October 2018 Edited by Ryan Ringle, Stefan Schwarz, Alain Lapierre, Oscar Naviliat-Cuncic, Jaideep Singh and Georg Bollen A. A. Valverde
[email protected]
Extended author information available on the last page of the article.
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Hyperfine Interact
(2019) 240:38
Fig. 1 Schematic diagram of the design of St. Benedict, showcasing the four major elements: the gas catcher, RF funnel extraction system, cooler-buncher, and Paul trap
to determine Vud , the largest of the three elements going into determining the CKM matrix unitarity from the normalization of the top row [1, 2]. Thanks to extensive experimental efforts, the superallowed 0+ → 0+ pure Fermi transitions provide the most precise value of Vud and thus the most stringent test of CKM matrix unitarity. However, alternate approaches are desirable to test for unknown systematic e
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