Ⅰ. HIGHLIGHTS OF THE YEARRIKEN Accel. Prog. Rep. 51 (2018)

TINA - a silicon tracker for transfer reactions
P. Schrock,∗1 Y. Beaujeault-Taudiere,∗2 N. Imai,∗1 K. Iribe,∗3 N. Kitamura,∗1 J. H. Ong,∗4 D. Suzuki,∗5T. Teranishi,∗3 and K. Wimmer∗6
In the OEDO Day 0 experiment in November 2017,
Se beams were energy-degraded and irradiated onto
a CD2 target. The light recoiling particle identiﬁcation (PID) plot obtained with TINA is shown in Fig. 3,
where the energy loss measured with the silicon detectors are plotted against the remaining energy depositedin the CsI crystals. Protons, deuterons, and tritons canclearly be distiguished.
An upgrade to implement highly granular DSSD detectors with GET readout electronics4) is ongoing. The
upgraded TINA will be well-suited for future transfer
studies at OEDO. TINA is also compact enough to becoupled with 4π γ-ray detector arrays.
10counts

E (MeV)

77,79

98(d,p) gs(d,d)

765
432(d,p) ex
3040

50

60

70

θlab (deg)Fig. 2. Kinematics plot of light recoiling particles obtainedwith a 12 C beam on a deuterated target.
ESi (MeV)Transfer reactions are powerful tools in nuclear
physics to study the structure of atomic nuclei. In (d, p)transfer, for instance, one neutron is added to a nucleus populating a single-particle orbital. Respective
measurements reveal important information about theshell structure, such as the appearance of closed shells(magic numbers) in exotic nuclear matter.1)
The recently commissioned OEDO beamline2) ofCNS and RIKEN can provide beams with the necessary intensities at low energies (10–20 MeV/nucleon),oﬀering experimental access to regions of the nuclear
chart that were hitherto inaccessible for (d, p) studies.
To utilize OEDO for transfer reactions, the silicondetector setup called TINA has been developed andsuccessfully used in two experiments. TINA is a joint
project of CNS, RCNP Osaka, and RIKEN Nishina
Center. It is designed for the position and energy
measurements of recoiling light particles (protons) fromtransfer reactions in inverse kinematics.
The ﬁrst (existing) version of TINA is shown inFig. 1. It consists of six telescopes, each with a YY1type silicon strip and CsI detectors. It has been used
at Kyushu University Tandem Accelerator and at theOEDO facility. At Kyushu, a 12 C beam impinged on adeuterated Ti target.3) The obtained kinematics curve(energy of YY1 vs. lab angle) of the recoiling light particles is shown in Fig. 2. Deuterons from elastic scattering as well as protons from transfer to the groundstate and some excited states were observed.

86Protons

35

Deuterons

30Tritons

25
20
15

4

102

5

5CsI

YY1∗2
∗3
∗4∗5∗615200ECsI (MeV)

Fig. 3. PID plot for light reaction products obtained in theOEDO Day 0 experiment.

Fig. 1. Photograph of TINA during use in the OEDO Day 0experiment.
∗110References
1) K. L. Jones et al., Nature (London) 465, 09048 (2010).
2) S. Michimasa (et al.), In this report.
3) T. Koiwai et al., RIKEN Accel. Prog. Rep. 50, 213(2017).
4) E. C. Pollacco et al., accepted for publication in Nucl.
Instrum. Methods A.

CNS, University of Tokyo
Department of Physics, Universite Paris-Saclay
Department of Physics, Kyushu University
RCNP, Osaka University
RIKEN Nishina Center
Department of Physics, University of Tokyo- 20 -