Direct reactions with the AT-TPC

Introduction Direct reactions are crucial tools for accessing properties of the atomic nucleus. Fundamental and exotic phenomena such as collective modes, pairing, weakbinding effects and evolution of single-particles energies can be investigated in peripheral collisions between a heavy nucleus and a light target. The necessity of using inverse kinematics to reveal how these structural properties change with isospin imbalance renders direct reactions a challenging technique when using the missing mass method. Methods In this scenario, Active Target Time Projection Chambers (AT-TPC) have demonstrated an outstanding performance in enabling these types of reactions even under conditions of very low beam intensities. The AT-TPC of the Facility for Rare Isotope Beams (FRIB) is a next generation multipurpose Active Target. When operated inside a solenoidal magnet, direct reactions benefit from the measurement of the magnetic rigidity that enables particle identification and the determination of the excitation energy with high resolution without the need of auxiliary detectors. Additionally, the AT-TPC can be coupled to a magnetic spectrometer improving even further its spectroscopic investigation capability. Results In this contribution, we discuss inelastic scattering and transfer reaction data obtained via the AT-TPC and compare them to theory. In particular, we present the results for the 14 C(p,p′) and 12 Be (p,d) 11 Be reactions. Discussion For 14 C, we compare the experimental excitation energy of the first 1 – excited state with coupled-cluster calculationsbased on nuclear interactions from chiral effective field theory and with available shell-model predictions. For 12 Be, we determine the theoretical spectroscopic factors of the 12 Be (p,d) 11 Be transfer reaction in the shell modeland compare them to the experimental excitation spectrum from a qualitative standpoint.

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Publication Details

Journal
Frontiers in Physics
Published
2025-03-24
DOI
https://doi.org/10.3389/fphy.2025.1539148
Citations
3
Primary Topic
Nuclear physics research studies
Type
article
Field-Weighted Citation Impact
5.61
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Direct reactions with the AT-TPC

J. Chen, Y. Ayyad, A. Muñoz-Ramos, Curtis Hunt et al.
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Frontiers in Physics
Nuclear physics research studies
5.61
article

Direct reactions with the AT-TPC

J. Chen, Y. Ayyad, A. Muñoz-Ramos, Curtis Hunt, C. Cabo, D. Bazin, H. Jayatissa, J. C. Zamora, V. Guimarães, T. Furuno, M. Z. Serikow, T. L. Tang, N. Watwood, Francesca Bonaiti, C. Santamaria, A. Anthony, G. W. McCann, C. Müller-Gatermann, I. Tolstukhin, S. Beceiro-Novo, M. L. Avila, W. Mittig, A. O. Macchiavelli, B. Olaizola, Khushi Bhatt, J. Lois-Fuentes, Takahiro Kawabata, Xiaobin Li, Zia-ur Rahman, Alex Hall-Smith, Harriet Kumi, Jose Manuel López-González, Daniel Regueira, Javier Rufino, Soki Sakajo, Nathan Turi
article en
3 citations

Abstract

Introduction Direct reactions are crucial tools for accessing properties of the atomic nucleus. Fundamental and exotic phenomena such as collective modes, pairing, weakbinding effects and evolution of single-particles energies can be investigated in peripheral collisions between a heavy nucleus and a light target. The necessity of using inverse kinematics to reveal how these structural properties change with isospin imbalance renders direct reactions a challenging technique when using the missing mass method. Methods In this scenario, Active Target Time Projection Chambers (AT-TPC) have demonstrated an outstanding performance in enabling these types of reactions even under conditions of very low beam intensities. The AT-TPC of the Facility for Rare Isotope Beams (FRIB) is a next generation multipurpose Active Target. When operated inside a solenoidal magnet, direct reactions benefit from the measurement of the magnetic rigidity that enables particle identification and the determination of the excitation energy with high resolution without the need of auxiliary detectors. Additionally, the AT-TPC can be coupled to a magnetic spectrometer improving even further its spectroscopic investigation capability. Results In this contribution, we discuss inelastic scattering and transfer reaction data obtained via the AT-TPC and compare them to theory. In particular, we present the results for the 14 C(p,p′) and 12 Be (p,d) 11 Be reactions. Discussion For 14 C, we compare the experimental excitation energy of the first 1 – excited state with coupled-cluster calculationsbased on nuclear interactions from chiral effective field theory and with available shell-model predictions. For 12 Be, we determine the theoretical spectroscopic factors of the 12 Be (p,d) 11 Be transfer reaction in the shell modeland compare them to the experimental excitation spectrum from a qualitative standpoint.

Frontiers in PhysicsVol. 13
High Point University (US), University of Notre Dame (US), Universidade da Coruña (ES), Argonne National Laboratory (US), Oak Ridge National Laboratory (US), Consejo Superior de Investigaciones Científicas (ES), Universidade de São Paulo (BR), Universidade de Santiago de Compostela (ES), Southern University of Science and Technology (CN), Instituto de Estructura de la Materia (ES), Michigan State University (US), The University of Osaka (JP)
Openalex Percentile: Top 6%
Nuclear physics research studies
5.61
DOIOpen Access PDFOpenAlex
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