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Nucleon Transfer using Radioactive Beams: results and lessons from the TIARA and TIARA+MUST2 experiments at SPIRAL

Abstract : The changes in shell structure in the light neutron-rich nuclei, leading to the emergence of N=16 as a new magic number to replace N=20, can be studied using single-neutron transfer via (d,p) using radioactive beams. Our initial results using a 24Ne beam [1] have been extended by further analysis including the use of coincident gamma-ray decay information from quadruple coincidence p-recoil-g-g data, and supplemented by follow-up studies using beams of 26Ne [2] and 20O [3]. All of these experiments were performed using SPIRAL at GANIL, with beams of 105, 103 and 105 pps respectively. The set-up used initially [4] for the 24Ne experiment was extended for the 26Ne and 20O work by the inclusion of the MUST2 array [5] along with TIARA and EXOGAM, which proved vital for high quality identification and measurement of particles emerging from pickup reactions (d,t), (d,3He) and (p,d). The reaction products from (p,p) and (d,d) elastic scattering and (d,p) stripping were recorded in TIARA. The new experimental set-up will be described, along with an overview of the initial results and how they address the aims of studying the emergence of the N=16 magic number and the existence of very low-lying negative parity intruder states for nuclei such as 27Ne, just above N=16. The results for neutron removal by transfer (via (p,d) or (d,t)) will be discussed in relation to higher energy nucleon removal reactions measured for the same exotic nuclei. Theoretical issues related to the interpretation of spectroscopic factor information from transfer reactions will be highlighted. Finally, an extension to this series of experiments will be described, using the new SHARC silicon array with the TIGRESS gamma-ray array and a beam of 25Na delivered by ISAC-2 at TRIUMF.
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http://hal.in2p3.fr/in2p3-00384516
Contributor : Michel Lion <>
Submitted on : Friday, May 15, 2009 - 12:38:26 PM
Last modification on : Wednesday, October 14, 2020 - 4:00:17 AM

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W.N. Catford, J.S. Thomas, M. Labiche, B. Fernandez-Dominguez, A. Remus. Nucleon Transfer using Radioactive Beams: results and lessons from the TIARA and TIARA+MUST2 experiments at SPIRAL. Nuclear Structure and Dynamics, May 2009, Dubrovnik, Croatia. ⟨in2p3-00384516⟩

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