II-9. Instrumentation

RIKEN Accel. Prog. Rep. 55 (2022)

RIKEN Accel. Prog. Rep. 55 (2022)

Commissioning of the Si-CsI array TiNA for direct reactions atOEDO
B. Mauss,∗1 N. Ma,∗2 J. W. Hwang,∗2,∗3 D. Suzuki,∗1 N. Imai,∗2 T. Teranishi,∗4,∗1 S. Ota,∗2,∗5 A. Kohda,∗5,∗1
M. Dozono,∗2,∗6 S. Michimasa,∗2 T. Sumikama,∗1 C. Iwamoto,∗7 and N. Iwasa∗8,∗1
The energy-degrading beamline OEDO is operating
at RIBF to expand the scope of reaction studies forradioactive nuclei.1) TiNA is an array of Si and CsI
detectors for direct reaction studies at OEDO to address a wide range of objectives in nuclear structure
and astrophysics.2) The ﬁrst version of the detector
has been used in several transfer experiments.3,4)
The TiNA detector was upgraded in 2020 to increase
the solid angle and improve the resolution in angleand energy.5) The upgraded TiNA consisted of two
types of detector assemblies. Four square telescopeswith a ﬁrst stage of double-sided strip silicon detectors (DSSD) and a second stage of CsI detectors werearranged in a barrel conﬁguration and placed just beyond the reaction target. The second detector assembly is a lampshade array consisting of six trapezoidal
telescopes with a ﬁrst stage of single-sided strip silicon detectors (SSSD) and a second stage of CsI detectors. The total angular coverage by the entire telescope
ranges from 10◦ to 80◦ in the laboratory frame.
For the data taking, two diﬀerent systems were uniﬁed. The DSSDs were connected to the General Electronics for TPCs (GET), an integrated system allowing the processing of a total of 1024 channels. The
test of the GET electronics has been reported in aprevious study.5) The signals from the rest of the detectors, including the CsI crystals and SSSDs, were fed
into standard analog ampliﬁers and digitized by VMEstandard ADC modules. Triggers from both systems
were merged in a trigger module. A common trigger issent to both DAQs and synchronizes the event number.
The detector was commissioned in-beam at the tandem accelerator facility of the Center for Accelerator
and Beam Applied Science, Kyushu University in January 2021. The aim of this commissioning was to measure the performances in terms of energy and angularresolutions, particle identiﬁcation for light ions, andDAQ capabilities.
A 14 MeV deuteron beam impinged on a 1 mg/cm2
thick 12 C target provided by the RCNP, Osaka University. At this beam energy, elastic scattering, inelastic scattering to excited states, and transfer (d, p) and
∗1
∗2
∗3
∗4
∗5
∗6
∗7
∗8

counts/25keV

3.85 MeV, 5/2+

100
3.09 MeV, 1/2+-g.s., 1/2

500024C excitation energy (MeV)

13Fig. 1. Excitation energy spectrum for the 12 C(d, p)13 C
transfer reaction using a 14 MeV deuteron beam.

(d, α) reactions are allowed. The preliminary results
give an energy resolution of 125 keV FWHM for theelastic scattering events measured by the DSSDs. Figure 1 shows the excitation energy for the (d, p) transferreaction. The protons were selected by the E − ΔE
method using the CsI crystals and DSSDs. The excitation energy resolution is approximately 330 keV
FWHM for proton energies around 14 MeV. Analysis
is still ongoing to improve the resolution.
In conclusion, the full setup of the TiNA detector
was successfully commissioned at the tandem accelerator facility of the Kyushu University. The event correlation between the two independent data acquisition
systems was validated; however, some DAQ capabilities should be improved in the future. The analysis isongoing with encouraging preliminary results.
References
1) S. Michimasa et al., Prog. Theor. Exp. Phys. 2019,
043D01 (2019).
2) P. Schrock et al., CNS Ann. Rep. 2016, CNS-REP-96,
7 (2017).
3) K. Wimmer et al., CNS Ann. Rep. 2017, CNS-REP-97,
7 (2019).
4) N. Imai et al., CNS Ann. Rep. 2018, CNS-REP-98, 1(2020).
5) B. Mauss et al., RIKEN Accel. Prog. Rep. 54, 114(2021).

RIKEN Nishina Center
Center for Nuclear Study, University of Tokyo
Center for Exotic Nuclear Studies, Institute for Basic Science
Department of Physics, Kyushu University
Research Center for Nuclear Physics, Osaka University
Department of Physics, Kyoto University
RIKEN Center for Advanced Photonics
Department of Physics, Tohoku University- 93 -1