☆ 4.5 Article

The SπRIT time projection chamber

REVIEW OF SCIENTIFIC INSTRUMENTS (2021)

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REVIEW OF SCIENTIFIC INSTRUMENTS

卷 92, 期 6, 页码 -

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AIP Publishing

DOI: 10.1063/5.0041191

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Instruments & Instrumentation Physics, Applied

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The SAMURAI Superconducting Analyzer enables measurements of heavy ion collisions at the RIKEN radioactive isotope beam factory, providing constraints on the equation of state of neutron-rich nuclear matter. The S pi RIT TPC allows for excellent particle reconstruction and isotopic resolution for pions and other charged particles.

The Superconducting Analyzer for MUlti-particles from RAdioIsotope (SAMURAI) Pion-Reconstruction and Ion-Tracker Time Projection Chamber (S pi RIT TPC) was designed to enable measurements of heavy ion collisions with the SAMURAI spectrometer at the RIKEN radioactive isotope beam factory and provides constraints on the equation of state of neutron-rich nuclear matter. The S pi RIT TPC has a 50.5 cm drift length and an 86.4 x 134.4 cm(2) pad plane with 12 096 pads that are equipped with the generic electronics for TPCs. The S pi RIT TPC allows for an excellent reconstruction of particles and provides isotopic resolution for pions and other light charged particles across a wide range of energy losses and momenta. The details of the S pi RIT TPC are presented, along with discussion of the TPC performance based on cosmic rays and charged particles emitted in heavy ion collisions.

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Article Physics, Nuclear

Apparent temperatures of neutron-poor and neutron-rich compound nuclei

A. B. McIntosh, K. Hagel, R. Wada, J. Gauthier, P. J. Cammarata, A. Keeler, A. Abbott, Y. W. Lui, L. A. McIntosh, A. Hannaman, B. Harvey, A. Jedele, L. W. May, M. Sorensen, M. Youngs, A. Zarrella, S. J. Yennello

Summary: The dependence of the nuclear caloric curve on neutron excess limits our knowledge of the nuclear equation of state and affects predictive capabilities of nuclear reaction and nuclear astrophysics models. The asymmetry dependence of the curve remains uncertain in theoretical models. To provide constraints, we measured evaporated particles and heavy residues for fusion-evaporation reactions. The temperatures extracted from light charged particles favor higher temperatures for neutron-rich fused systems, but are near the limits of systematic uncertainty. This measurement serves as an upper limit for constraining the asymmetry dependence of the nuclear caloric curve.

PHYSICAL REVIEW C (2023)

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Article Physics, Nuclear

Investigating the time dependence of neutron-proton equilibration using molecular dynamics simulations

A. Jedele, K. Hagel, M. Q. Sorensen, B. Harvey, A. Abbott, J. Gauthier, A. Hannaman, A. A. Hood, Y. -w. Lui, L. McCann, A. B. McIntosh, L. A. McIntosh, S. Schultz, Z. Tobin, R. Wada, M. Youngs, S. Yennello

Summary: Neutron-proton equilibration in dynamically deformed nuclei during heavy ion collisions has been experimentally studied, revealing that the composition of the two heaviest fragments evolved to be more similar with respect to their orientation angle. By performing Constrained Molecular Dynamics and Antisymmetrized Molecular Dynamics simulations with different formulations of the density dependence of the asymmetry energy term, it was found that a softer interaction in the nuclear equation of state provides better agreement with experimental results.

PHYSICAL REVIEW C (2023)

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Article Physics, Nuclear

Gamow-Teller decay of 142Te to 142I

B. Moon, C. -b. Moon, A. Odahara, R. Lozeva, S. Nishimura, C. Yuan, F. Browne, P. Doornenbal, G. Lorusso, Z. Patel, S. Rice, L. Sinclair, P. -a. Soderstrom, T. Sumikama, H. Watanabe, J. Wu, Z. Y. Xu, A. Yagi, D. S. Ahn, H. Baba, F. L. Bello Garrote, R. Daido, J. M. Daugas, F. Didierjean, Y. Fang, N. Fukuda, B. Hong, E. Ideguchi, N. Inabe, T. Ishigaki, T. Isobe, H. S. Jung, D. Kameda, I. Kojouharov, T. Komatsubara, T. Kubo, Y. K. Kwon, C. S. Lee, P. Lee, S. Morimoto, D. Murai, M. Niikura, H. Nishibata, I. Nishizuka, H. Sakurai, Y. Shimizu, H. Suzuki, H. Takeda, K. Tshoo, R. Yokoyama

Summary: The beta decay of 142Te90 to 142I89 was investigated for the first time. The parent nucleus was produced by the in-flight fission of a 238U beam with an energy of 345 MeV per nucleon, impinging on a 9Be target at the Radioactive Isotope Beam Factory of RIKEN. Excited states in 142I were established by beta-delayed gamma-ray spectroscopy. The (1+) states in 142I were found to be predominantly formed by a Gamow-Teller transition between a neutron and a proton in specific orbitals.

PHYSICAL REVIEW C (2023)

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Proceedings Paper Physics, Multidisciplinary

HALF-LIFE MEASUREMENT USING IMPLANT-(β - γ) TIME CORRELATIONS IN THE REGION OF NEUTRON-RICH LANTHANIDES

A. Vitez-Sveiczer, S. Kovacs, G. G. Kiss, Y. Saito, A. Tarifeno-Saldivia, M. Pallas, J. L. Tain, L. Dillmann, J. Agramunt, A. Algora, C. Domingo-Pardo, A. Estrade, C. Appleton, J. M. Allmond, P. Aguilera, H. Baba, N. T. Brewer, C. Bruno, R. Caballero-Folch, F. Calvino, P. J. Coleman-Smith, G. Cortes, T. Davinson, N. Fukuda, Z. Ge, S. Go, C. J. Griffin, R. K. Grzywacz, O. Hall, A. Horvath, J. Ha, L. J. Harkness-Brennan, T. Isobe, D. Kahl, T. T. King, A. Korgul, R. Krucken, S. Kubono, M. Labiche, J. Liu, J. Liang, M. Madurga, K. Miernik, F. Molina, A. I. Morales, M. R. Mumpower, E. Nacher, A. Navarro, N. Nepal, S. Nishimura, M. Piersa-Silkowska, V. Phong, B. C. Rasco, B. Rubio, K. P. Rykaczewski, J. Romero-Barrientos, H. Sakurai, L. Sexton, Y. Shimizu, M. Singh, T. Sprouse, T. Sumikama, R. Surman, H. Suzuki, T. N. Szegedi, H. Takeda, A. Tolosa-Delgado, K. Wang, M. Wolinska-Cichocka, P. Woods, R. Yokoyama, Z. Xu

Summary: In this experiment, neutron-rich lanthanides were produced through in-flight fission to measure their half-lives and beta-delayed neutron emission probabilities, which can help constrain r-process abundance calculations. The validation of the results was done using implantation-beta time correlations and gamma-spectroscopic methods, showing comparable uncertainties and mean values within the expected range.

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT (2023)

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Proceedings Paper Physics, Multidisciplinary

EXPERIMENTAL LEVEL SCHEME OF 78Cu

L. G. Pedersen, E. Sahin, A. Gorgen, F. L. Bello Garrote, Y. Tsunoda, T. Otsuka, M. Niikura, S. Nishimura, Z. Xu, H. Baba, G. Benzoni, F. Browne, A. M. Bruce, S. Ceruti, F. C. L. Crespi, R. Daido, G. de Angelis, M. -C. Delattre, Zs Dombradi, P. Doornenbal, Y. Fang, S. Franchoo, G. Gey, A. Gottardo, T. Isobe, P. R. John, H. S. Jung, I. Kojouharov, T. Kubo, N. Kurz, I. Kuti, Z. Li, G. Lorusso, I. Matea, K. Matsui, D. Mengoni, T. Miyazaki, V. Modamio, S. Momiyama, A. I. Morales, P. Morfouace, D. R. Napoli, F. Naqvi, H. Nishibata, A. Odahara, R. Orlandi, Z. Patel, S. Rice, H. Sakurai, H. Schaffner, L. Sinclair, P. -A. Soderstrom, D. Sohler, I. G. Stefan, T. Sumikama, D. Suzuki, R. Taniuchi, J. Taprogge, Z. Vajta, J. J. Valiente-Dobon, H. Watanabe, V. Werner, J. Wu, A. Yagi, M. Yalcinkaya, R. Yokoyama, K. Yoshinaga

Summary: Excited states in Cu-78 were observed for the first time following the ss decay of Ni-78 created by in-flight fission of U-238. A level scheme comprising eight excited states with tentative spin assignments for 5 of them was constructed based on the coincidence relationships between the observed gamma-ray transitions. In addition, an isomeric state with a lifetime of 3.8(4) ms was found to decay by internal conversion.

ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT (2023)

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