CNS Annual Report 2022

Contribution List

30. Cathode-readout self-triggering system on a multi wire drift chamber

Accelerator and Instrumentation

We are developing a single-channel readout from the cathode planes of a multi wire drift chamber to achieve both self triggering and high tracking efficiency in 6He beam experiments at CRIB.

28. Charge exchange reaction of rubidium and francium ions using an yttrium neutralizer

Experimental Nuclear Physics: Low and Intermediate Energies

In this report, charge exchange reaction of rubidium and francium ions using an yttrium neutralizer is discussed.

14. Current status of the development of the emittance monitor for high-intensity ion beams accelerated by AVF Cyclotron

Accelerator and Instrumentation

We will report the current status of the development of emittance monitor for high-intensity beam accelerated by AVF Cyclotron.

4. Data analysis of OEDO day 0 experiment measuring 93Zr + d transmutation reactions for the study of deuteron breakup

Experimental Nuclear Physics: Low and Intermediate Energies

In Autumn 2017, the OEDO setup was commissioned during a series of day 0 experiments performed by the ImPACT 17-02-01 collaboration. One of these experiments measured ${}^{93}$Zr+d transmutation reactions at ~ 28 MeV/u, the lowest energy to date. Deuterons have a low binding energy (2.224 MeV) and therefore undergo breakup whilst in the presence of Coulomb and nuclear fields. By comparing...

13. Development and commissioning of a mosaic type array formed by Si photodiodes

Accelerator and Instrumentation

Si detectors are extensively applied in the measurement of charged particles produced in fusion reactions. In order to achieve a relatively low-cost charged-particle detection with fair position sensitivity, we have developed a mosaic-type detector array based on Si photodiodes (Hamammatsu S13955-01). Its high modularity allows one to modify the geometric configuration of the array according...

23. Development of a Radio Frequency Dipole Mass Filter for the Francium Permanent Electric Dipole Moment Search

Accelerator and Instrumentation

In order to improve the measurement accuracy of the permanent electric dipole moment of francium (Fr), a radio frequency dipole mass filter (RFDMF) was developed to improve the purity of Fr ion beam. RFDMF has the unique feature of enabling mass separation in the very short beam transport system of only a few tens of centimeters. The experiment to evaluate its performance with Fr ion beam...

6. Development of sustainable ${}^{24}$Mg${}^{8+}$ beam production at HyperECR

Accelerator and Instrumentation

In collaboration with the CRIB spectrometer group, we
have been developing a magnesium beam that can be provided
for long-term experiments.
CNS 14 GHz HyperECR ion source provides various
metal ion beams to the RIKEN AVF cyclotron. The
magnesium beam was already been put to practical use,
however, its intensity and sustainability had not met the requirements
of the experiment group....

17. Dielectron production in central PbPb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 TeV

Experimental Nuclear Physics: Low and Intermediate Energies

The Dielectron production in central PbPb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}$ = 5.02 TeV is disscused.

10. Direct mass measurement of proton-rich Fe isotopes

Experimental Nuclear Physics: Low and Intermediate Energies

The two-proton radioactivity (2p decay) is an exotic decay mode that was predicted theoretically in the 1960s and first discovered experimentally in 2002. Two protons are simultaneously emitted from the ground state of some neutron-deficient nuclei such as 19Mg, 45Fe, 48Ni, and 54Zn.
Because the two-proton emitters are very undatable, it is difficult to study their energy structure, and the...

5. Direct measurement of the ${}^{26}$Si($\alpha$, p)${}^{29}$P reaction at CRIB for the nucleosynthesis in the X-ray bursts

Experimental Nuclear Physics: Low and Intermediate Energies

In the X-ray bursts, the ${}^{26}$Si($\alpha$, p)${}^{29}$P reaction rate has a great impact on the light curve. However, there was not enough experimental data for this reaction because of the technical difficulty.
A direct measurement was performed at the CNS RI beam separator (CRIB). And the yield of the ($\alpha$,p) reaction was determined by removing the background events seen in the...

25. Direct measurement of the 14O(α,p)17F reaction with the Texas Active Target v2 detector

Experimental Nuclear Physics: Low and Intermediate Energies

Recent sensitivity studies showed that the ${}^{14}$O($\alpha ,p$)${}^{17}$F is one of the very important reactions affecting a large uncertainty of energy generation and final ash in X-ray burst models. The reaction was also emphasized as a key determination of the break-out path from the hot CNO cycle to the $rp$-process at sufficiently high temperatures (T${}_9$ > 0.5), specifically the spin and...

18. Gamma ray measurement with position-sensitive Ge detector array GRAPE using the 238U beam at the RI Beam Factory

Accelerator and Instrumentation

Gamma-Ray Detector Array with Position and Energy Sensitivity (GRAPE) has been developed since 2000 for high-resolution in-beam γ-ray spectroscopy using Radioactive Ion (RI) beams.
In the RIBF DA21-05 machine time, 238U at 650 kcps intensity and 307 MeV/u energy irradiated TiD, Ti, and CD2 targets , and gamma rays emitted at the F8 focal plane were measured with 6 GRAPE detectors. Background...

24. Half-life measurement of 107-keV isomeric state in 45Cr

Experimental Nuclear Physics: Low and Intermediate Energies

We did the experiment that carried out mass measurements around 47Fe in May 2022. Then, we made a lot of unstable nuclei. Some of them emitted γ-rays and backed to ground state. These γ-rays measured by Ge detector. In this experiment, we succeeded in measuring the half-life of the 107-keV isomeric state in 45Cr.

2. Improved ${}^6$He beam production at CRIB with MWDC and degraders

Accelerator and Instrumentation

The second 6He beam production test at CRIB was carried out in Oct. 2022 as a two-day Machine Study (MS-EXP22-05), to improve the
7 effective intensity and purity of the 6He beam by introducing wire chambers (MWDC) and degraders. We report the result of the test, presenting the comparison of beam parameters with the previous test.

27. Isomeric gamma ray measurement system at S2+ in SHARAQ13 experiment

Accelerator and Instrumentation

In the SHARAQ13 experiment, mass measurement of the proton-rich isotopes around 47Fe has been performed. To assist the particle identification and to search for new isomeric states, the gamma-ray detectors for the isomer tagging were installed in the air downstream of the final focal plane(S2).
Two HPGe detectors were placed perpendicular from the beam direction. To confirm the accuracy of...

26. Measurement of double charge exchange (${}^{12}$C, ${}^{12}$Be(0${}_2^{+}$)) reaction aiming for the observation of double Gamow-Teller giant resonance

Experimental Nuclear Physics: Low and Intermediate Energies

We performed a missing mass spectroscopy at RIBF using double charge exchange reaction ${}^{48}$Ca(${}^{12}$C, ${}^{12}$Be(0${}_2^{+}$)), aiming for the observation of the double Gamow-Teller giant resonance. We observed some structures in the excitation energy spectrum of ${}^{48}$Ti at the energy region where the double Gamow-Teller giant resonance is expected to exist. We compared the experimental...

12. Measurement of fusion-evaporation cross sections in ${}^{136}$Xe+${}^{64}$Zn system using inverse kinematics

Experimental Nuclear Physics: Low and Intermediate Energies

The heavy-ion fusion reaction is powerful in expanding the chart of nuclides as well as exploring the nuclear structure beyond Pb (Z = 82). A fusion experiment was performed at HIMAC to study the inverse kinematic systems by bombarding the low-energy ${}^{136}$Xe beam onto ${}^{27}$Al, ${}^{nat}$Cu and ${}^{nat}$Zn targets. Two newly developed detectors were used in the experiment: a...

22. Measurement of long-range two-particle correlation and v_{2}(\eta) in p-Pb collisions at 5.02 TeV

Experimental Nuclear Physics: Low and Intermediate Energies

TBA

3. Multiplicity dependence of direct photon production in pp collisions at $\sqrt{s}$ = 13 TeV

Experimental Nuclear Physics: Low and Intermediate Energies

In this report, we report multiplicity dependence of direct photon production in pp collisions at $\sqrt{s}$ = 13 TeV. The purpose of this study is to investigate if thermalized system such as the quark-gluon plasma (QGP) is created even in the small colliding system.

1. New implantation detectors for decay spectroscopy at fragmentation facilities

Accelerator and Instrumentation

The study of
𝛽 decays far from stability is essential to understand the evolution of nuclear
structure and nucleosynth esis processes. 𝛽 decay experiments with such exotic nuclei involve
intense cocktail beams from fragmentation facilities. The role of an implantation detector in
these experiments is to measure the energy and the positions of both heavy ion implantation
a nd 𝛽 ray...

8. Optical system for the optical lattice trapping of heavy alkali atoms

Accelerator and Instrumentation

Precision spectroscopy of heavy atoms, including francium, is expected to provide insight into the origins of fundamental symmetry violation. The key for achieving high experimental sensitivity is to cool the atoms and trap them within the measurement region. We report on the construction of an optical system that enables us to trap alkali atoms in a one-dimensional optical lattice. The system...

16. Preliminary results on the reaction of the 6He+p scattering experiment in MS

Experimental Nuclear Physics: Low and Intermediate Energies

The Machine study for the 6He+p experiment was carried out in CRIB, the 6He beam energy was ~48 MeV with 91% purity via 20 um mylar degrader. We also carried out one short scattering measurement of the 6He+p reaction with one set of dE-E detectors, the locus of the p, d, t, alpha, 6He can be clearly seen. The proton and triton were identified combined with the kinematic calculation of the...

15. Recent activities on an active target CAT-M

Accelerator and Instrumentation

An active target CAT-M has been developed to perform traditional reactions with light ions in inverse kinematics. Recently we installed a dipole magnetic field using permanent magnets to improve the signal-to-noise ratio by confining delta-electrons within the beam region. TTT silicon detectors from KU Leuven were employed for a better angular resolution in laboratory frame and resulting...

7. Report on OEDO-SHARAQ experiments in FY2022

Accelerator and Instrumentation

We briefly report the OEDO-SHARAQ experiments performed in FY2022.

32. Spectroscopy of 32Mg via one-neutron and two-proton knockout reactions

Noritaka Kitamura

Experimental Nuclear Physics: Low and Intermediate Energies

29. Study of $\nu p$ process nucleosynthesis at OEDO

Experimental Nuclear Physics: Low and Intermediate Energies

TBA

19. Study of dielectron measurement capabilities in the phase 3 upgrade of the LHC-ALICE experiment

Accelerator and Instrumentation

In this report, we report dielectron measurement capabilities in the phase 3 upgrade of the LHC-ALICE experiment.
The purpose of this study is to evaluate whether the electrons from the pre-equilibrium process can be measured using electron identification by ECal.

21. Study of space-charge distortion correction for the ALICE Time Projection Chamber using machine learning techniques

Accelerator and Instrumentation

The current status of studies on the ALICE-TPC space-charge distortion correction using machine learning methods will be discussed in this article.

11. surrogate reaction of 130Sn(n,g) at OEDO

Experimental Nuclear Physics: Low and Intermediate Energies

130Sn(d,p) reaction in the inverse kinematics was measured at OEDO/SHARAQ beam line to deduce the neuron capture reaction rate of 130Sn. The energy degraded 130Sn, 130Te, and 124Sn beams were directed onto a thin CD2 target. The reaction residues were identified by the SHARAQ in coincidence with the recoild protons detected by TiNA2 array.

33. TBA

TBA