Performance test of the MAIKo active target

Abstract

A new active target named MAIKo (Mu-PIC based Active target for Inverse Kinematics • ) has been developed at Kyoto University and Research Center for Nuclear Physics (RCNP), Osaka University. MAIKo is suited for missing-mass spectroscopy of unstable nuclei at forward scattering angles in inverse kinematics. MAIKo consists of a time projection chamber (TPC), which incorporates a micro-pixel chamber (µ-PIC) as the electron multiplication and collection system. In MAIKo, the medium gas also plays the role of a reaction target, thus allowing detection of low-energy recoil particles with high position resolution. The MAIKo TPC was commissioned with He(93%)+iso-C 4 H 10 (7%) and He(93%)+CO 2 (7%) mixture gasses at 430 hPa. The gas gain and the angular resolution of MAIKo were evaluated with an alpha source and a 4 He beam at 56 MeV. The TPC was stably operated up to 1000-kcps beam intensity. A tracking algorithm using the Hough transform method has been developed to analyze scattering events. An angular resolution of 1.3 • was achieved for scattered 4 He particles.

Neutron quadrupole transition strength in C10 deduced from the C10(α,Furuno1, Kawabata2, Adachi3 et al. 2019Phys. Rev. CSelf Cite9020View full textAdd to dashboardCite

“…The purity and intensity of the 10 C secondary beam were 96% and 70 kcps, respectively. The recoil alpha particles were detected using the newly developed MAIKo active target system [35]. This system enabled the detection of low-energy recoil alpha particles down to E α = 0.5 MeV, which corresponds to momentum transfer down to q = 0.4 fm −1 .…”

“…(ii) Extract the straight lines in the anode and cathode images using the Hough transformation [41,42] as described in Ref. [35]. (iii) If the number of nonhorizontal lines in the anode images is 1, this line is regarded as the trajectory of the recoil alpha particles.…”

“…To overcome the challenge of detecting low-energy recoil alpha particles, we recently developed the MAIKo active target [35]. This system consists of a time projection chamber (TPC) which is a gaseous detector with three-dimensional reconstruction capability for charged particle trajectories.…”

Digital Signal Analysis based on Convolutional Neural Networks for Active Target Time Projection Chambers

“…In the past few years, active-target time projection chambers (ATTPCs) have become a quite important and relevant instrument for investigation in nuclear physics. Several TPC projects have been developed in many laboratories Email addresses: guilherme.fortino@usp.br (G. F. Fortino), zamora@nscl.msu.edu (J. C. Zamora ) around the world for detailed studies of nuclear structure, rare decay modes and particle production with the most exotic nuclei [1,2,3,4,5,6]. An important advantage of these systems over standard techniques is the large solid angle coverage and the capability to perform complete kinematic measurements.…”

Novel multi-layer plastic-scintillator-based solid active proton target for inverse-kinematics experiments

“…The unstable nuclei, with long isotopic chains, provide the ideal platforms for systematic studies using nuclear reactions. The increasing availability of a wide range of highly-or moderately-intense RI beam species, and developments of more complex and sophisticated detector systems such as multi-strip silicon arrays [9,10] and active gaseous target detector systems [11,12,13,14,15] have enhanced the prospect for spectroscopic studies of unstable nuclei with nuclear reactions. One of the most versatile experimental methods via nuclear reactions is the missing-mass spectroscopy.…”