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Rebeiro BM, Triambak S, Garrett PE, Ball GC, Brown BA, Menéndez J, Romeo B, Adsley P, Lenardo BG, Lindsay R, Bildstein V, Burbadge C, Coleman R, Diaz Varela A, Dubey R, Faestermann T, Hertenberger R, Kamil M, Leach KG, Natzke C, Nzobadila Ondze JC, Radich A, Rand E, Wirth HF. ^{138}Ba(d,α) Study of States in ^{136}Cs: Implications for New Physics Searches with Xenon Detectors. Phys Rev Lett 2023; 131:052501. [PMID: 37595245 DOI: 10.1103/physrevlett.131.052501] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Accepted: 07/07/2023] [Indexed: 08/20/2023]
Abstract
We used the ^{138}Ba(d,α) reaction to carry out an in-depth study of states in ^{136}Cs, up to around 2.5 MeV. In this Letter, we place emphasis on hitherto unobserved states below the first 1^{+} level, which are important in the context of solar neutrino and fermionic dark matter (FDM) detection in large-scale xenon-based experiments. We identify for the first time candidate metastable states in ^{136}Cs, which would allow a real-time detection of solar neutrino and FDM events in xenon detectors, with high background suppression. Our results are also compared with shell-model calculations performed with three Hamiltonians that were previously used to evaluate the nuclear matrix element (NME) for ^{136}Xe neutrinoless double beta decay. We find that one of these Hamiltonians, which also systematically underestimates the NME compared with the others, dramatically fails to describe the observed low-energy ^{136}Cs spectrum, while the other two show reasonably good agreement.
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Affiliation(s)
- B M Rebeiro
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Department of Physics, McGill University, Montréal, Québec H3A 2T8, Canada
| | - S Triambak
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - P E Garrett
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - G C Ball
- TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
| | - B A Brown
- Department of Physics and Astronomy and National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
| | - J Menéndez
- Department of Quantum Physics and Astrophysics and Institute of Cosmos Sciences, University of Barcelona, 08028 Barcelona, Spain
| | - B Romeo
- Donostia International Physics Center, 20018 San Sebastián, Spain
| | - P Adsley
- Cyclotron Institute and Department of Physics and Astronomy, Texas A&M University, College Station, Texas 77843, USA
| | - B G Lenardo
- SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
| | - R Lindsay
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - V Bildstein
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - C Burbadge
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Coleman
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - A Diaz Varela
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - R Dubey
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
- Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland
| | - T Faestermann
- Physik Department, Technische Universität München, D-85748 Garching, Germany
| | - R Hertenberger
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
| | - M Kamil
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - K G Leach
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - C Natzke
- Department of Physics, Colorado School of Mines, Golden, Colorado 80401, USA
| | - J C Nzobadila Ondze
- Department of Physics and Astronomy, University of the Western Cape, P/B X17, Bellville 7535, South Africa
| | - A Radich
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - E Rand
- Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - H-F Wirth
- Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748 Garching, Germany
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