Bulletin of the American Physical Society
6th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Sunday–Friday, November 26–December 1 2023; Hawaii, the Big Island
Session F07: Instrumentation: Targets and Sources |
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Chair: Rebecca Toomey, Lawrence Livermore National Laboratory Room: Hilton Waikoloa Village Queens 6 |
Thursday, November 30, 2023 9:00AM - 9:30AM |
F07.00001: NMR signal analysis for deuteron polarization determination in a COMPASS large polarized 6LiD target Invited Speaker: Yuya Takanashi The internal structure of nucleons is an ongoing research topic of great importance. At COMPASS, in the 2021-2022 period, we adopted 6LiD as a polarized target and measured the azimuthal distribution of the cross-section for the production of π mesons when muons are injected. We investigated the Sivers asymmetry and Collins asymmetry. The polarization and its error of the target are crucial parameters for determining the Sivers asymmetry and Collins asymmetry. The polarized target is the largest ever with a length of 120 cm. To reduce systematic errors for the asymmetry, the target is divided into three cells, and the adjacent cells are polarized in the opposite direction to perform scattering experiments. Each cell of the target is equipped with 3 or 4 coils, and the intensity of Nuclear Magnetic Resonance (NMR) signals obtained from a total of 10 coils was measured. The polarization was determined by calibrating the NMR signals with the signals obtained in the thermal equilibrium state (TE). The NMR signals at TE were measured over several days under various conditions, including target temperatures of 1.0 K, 1.3 K, 1.5 K, with a magnetic field of 2.5 T. Dynamic Nuclear Polarization (DNP) was used as a means to polarize the target. DNP was performed over several days while varying the frequency and power of the microwaves irradiated into each cell. In this presentation, we provide details on the analysis of NMR signals for determining the polarization of deuterons at COMPASS. |
Thursday, November 30, 2023 9:30AM - 9:45AM |
F07.00002: Polarized 3He Target Performance in the JLab SBS GEn Experiment, E12-09-016 Hunter Presley, Huong Nguyen, Vladimir Nelyubin, Jian-Ping Chen, Xiaochao Zheng, Gordon D Cates, William A Tobias, Jack Jackson, Todd D Averett, Arun Tadepalli, Christopher J Jantzi, Kate Evans, William P Henry The JLab Super Bigbite Spectrometer (SBS) program’s primary goal is to determine the elastic nucleon form factors at high momentum transfer. The SBS program includes a measurement of the neutron electric form factor, GEn, using the double-polarization technique with both a polarized electron beam and a polarized He-3 target. In order to obtain adequate statistics in the high Q2 region, the polarized He-3 target has operated with a polarization-weighted luminosity approximately a factor of three above any previous polarized He-3 target used in an electron-scattering experiment. The target itself consists of a double-chambered glass cell, filled to approximately 7 atm of He-3 at room temperature, with a long cylindrical "target chamber" 60 cm in length. In order to maintain high polarization with electron beam currents up to 60uA, the target cells contain roughly 6 STP liters of He-3, twice the quantity of He-3 used in previous targets at JLab. This cell is polarized using alkali-hybrid spin-exchange optical pumping using up to 200W of near-infrared light from high-powered diode-laser arrays. The target polarization percentage is determined by a technique utilizing Electron Paramagnetic Resonance (EPR) as well as Nuclear Magnetic Resonance (NMR). Multiple target calibrations were carried out throughout the experiment in order to precisely determine the target polarization. This talk will include polarimetry results of all targets used during the GEn run period. |
Thursday, November 30, 2023 9:45AM - 10:00AM |
F07.00003: Development of a monoenergetic neutron source in the 10 MeV region for neutron inelastic scattering experiments Masatoshi Itoh, Satoshi Adachi, Shumpei Yamazaki, Shohei Yonekura, Genki Hosoya, Ryota Saito, Yohei Matsuda, Takahiro Kawabata, Hidetoshi Akimune The triple alpha reaction which creates the 12C nucleus from three 4He nuclei is one of the key reactions to understand the nucleosynthesis in the Universe. It has been pointed out that the triple alpha reaction may be greatly enhanced in the high temprature and high density environment due to the neutron-induced deexcitation of the 02+ state, that is ,the Hoyle state. This enhancement is directly related to neutron inelastic scattering cross sections for the 01+ → 02+ and the 21+ → 02+ transitions on 12C near threshold energies. However, there are no experimental data for these cross sections, since there is a no conventional monoenergetic neutron source in the 10 MeV region which is close to the threshold energy to excite the 02+ state from the ground state in 12C. Therefore, we developed the monoenergetic 10 MeV neutron source at CYRIC in Tohoku University. |
Thursday, November 30, 2023 10:00AM - 10:15AM |
F07.00004: Cryogenic hydrogen gas target for a high-intensity monoenergetic neutron source Shumpei Yamazaki, Masatoshi Itoh, Satoshi Adachi, Shohei Yonekura, Genki Hosoya, Ryota Saito, Takahiro Kawabata The triple alpha process is an essential reaction in nucleosynthesis. By that reaction, 12C is produced from three alpha particles. In a hot and dense environment, the triple alpha reaction rate can be enhanced by the neutron upscattering process. In such a process, the Hoyle state in 12C decays into the bound states by giving its excitation energy to neutrons instead of radiation decay. We are planning to measure a cross section of the inverse reaction to determine the enhancement factor. For the measurement, we have been developing a monoenergetic 10 MeV neutron source by using 1H(13C, n)13N reaction at E13C = 72.7 MeV. |
Thursday, November 30, 2023 10:15AM - 10:30AM |
F07.00005: Development of the solid deuteron target for measuring the gamma-decay probability of the 3-1 state in 12C with deuteron inelastic scattering Yuya Honda, Takahiro Kawabata, Yohei Matsuda, Tatsuya Furuno, Kosuke sakanashi, Motoki Murata, Shintaro Okamoto, Yuki FUJIKAWA, Kenjiro Miki, Koki Kameya, Ren Urayama, Masatoshi Itoh, Satoshi Adachi, Shohei Yonekura, Shumpei Yamazaki, Genki Hosoya The triple alpha (3α) reaction, which produces 12C from three α particles, is one of the most important reactions in nucleosynthesis in the universe. The radiative-decay probabilities of the 3α resonance states are crucial physical quantities that determine the 12C production rate. At high temperatures above 109 K, high-lying excited states e.g., 3-1 and 2+2 states in 12C play an important role. |
Thursday, November 30, 2023 10:30AM - 10:45AM |
F07.00006: The Ultra-Slow Muon generation at J-PARC: the present status and future prospects Yu Oishi, Sohtaro Kanda, Natsuki Teshima, Taihei Adachi, Yutaka Ikedo, Yukinari Nagtani, Katsuhiko Ishida, Koichiro Shimomura We will introduce the present status of Ultra-Slow Muon (USM) generation at J-PARC and prospects. One of the four beamlines at J-PARC MLF generates USM from intense surface muon beams (4 MeV). The surface muon is stopped in the muonium production target, and the USM (~0.2eV) are generated by resonant laser ionization of thermal muonium evaporating into the vacuum. The approaching 1000 USM per second has been achieved through the development of the intense Lyman-α laser system. Recently, this USM beam has been applied to material science with Muon Spin Rotation/Relaxation/Resonance method. It is known that the spin polarization of the generated USM is less than 50% due to the coupling between randomly polarized electrons and 100% polarized surface Muons in the Muonium production process. As one of the developments for the muon g-2 experiment to be carried out at J-PARC new USM beamline, we will introduce the prospect of spin re-polarization using circular polarized Lyman-α lasers. |
Thursday, November 30, 2023 10:45AM - 11:00AM |
F07.00007: Simulation study and modification of the MAIKo+ active-target field cage Yifan Lin, Tatsuya Furuno, Takahiro Kawabata, Motoki Murata We aim to determine the rate of the triple-alpha reaction in dense conditions. To do this, we're investigating the transition of 12C from the Hoyle state to its grand state via the neutron up- scattering. Since the direct measurement of the above reaction is impossible, we're measuring the time-reversal reaction and using the principle of detailed balance. |
Thursday, November 30, 2023 11:00AM - 11:15AM |
F07.00008: Status of the Multi-layer Active target for MoNA Experiment (MAME) Hannah Erington, Thomas Baumann, Roman Chzyh, Marco Cortesi, Paul Gueye, Iulia-Maria Harca, Nicholas Mendez, Thomas Redpath The MoNA Collaboration uses the invariant mass technique to study neutron-unbound systems at the Facility for Rare Isotope Beams (FRIB). The Collaboration developed a silicon-beryllium based active segmented target to increase the production yield and resolution of the reconstructed decay energy since the corresponding cross section for such systems is of order of 0.1-1.0 mb. This target was used successfully for two experiments (26O lifetime and 31Ne excited states). However, the 140 mm thick silicon detectors have limitations from current saturation and radiation damage, typical for these solid-state devices, thus preventing to benefit fully from the high FRIB beam rates (which is about 4 orders of magnitude more than previous experiments). Investigation of a gas-filled time projection chamber coupled to a gaseous electron multiplier (GEM) is under development to address this issue. This Multi-layer Active Target for MoNA Experiment (MAME) is expected to enable missing mass capability by tracking recoils and fragments from reactions used to produce neutron-unbound systems. Additionally, the scalable readout system (SRS) data acquisition system is used for the high channel density readout. The calibration of the SRS system is now underway, giving preliminary data that will aid in the design of the system. The reaction mechanisms for isotope production are also being studied with a GEANT4 simulation. The status of this project will be reviewed and discussed. |
Thursday, November 30, 2023 11:15AM - 11:30AM |
F07.00009: Commissioning of the Neutron Irradiation Station at the University of Notre Dame Miriam Matney, Daniel Robertson, Anna Simon, Khachatur Manukyan, Ani Aprahamian, Daniel Bardayan, Richard J deBoer, Edward Stech, Michael C F Wiescher We have developed and commissioned the Neutron Irradiation Station (NIS) facility at the University of Notre Dame Nuclear Science Laboratory, which produces high-flux, quasi-monoenergetic neutrons via the reaction 7Li(p,n) for use in neutron-induced reaction measurements for nuclear energy and stockpile stewardship applications. To commission NIS, neutron energy distributions were characterized for various proton energies and neutron standard foils were activated to determine neutron fluxes at different locations relative to the production target. This presentation will discuss neutron energy spectra and flux results as well as plans for upcoming reaction measurements with NIS. |
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