A1 Journal article (refereed)
Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 137I and 95Rb (2019)

Guadilla, V., Tain, J. L., Algora, A., Agramunt, J., Jordan, D., Monserrate, M., Montaner-Pizá, A., Nácher, E., Orrigo, S. E. A., Rubio, B., Valencia, E., Estienne, M., Fallot, M., Le Meur, L., Briz, J. A., Cucoanes, A., Porta, A., Shiba, T., Zakari-Issoufou, A.-A., . . . Martinez, T. (2019). Total absorption γ-ray spectroscopy of the β-delayed neutron emitters 137I and 95Rb. Physical Review C, 100(4), Article 044305. https://doi.org/10.1103/PhysRevC.100.044305

JYU authors or editors

Publication details

All authors or editors: Guadilla, V.; Tain, J. L.; Algora, A.; Agramunt, J.; Jordan, D.; Monserrate, M.; Montaner-Pizá, A.; Nácher, E.; Orrigo, S. E. A.; Rubio, B.; et al.

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2019

Volume: 100

Issue number: 4

Article number: 044305

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevC.100.044305

Publication open access: Not open

Publication channel open access: 

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/65975

Web address of parallel published publication (pre-print): https://arxiv.org/abs/1907.02748

Abstract

The decays of the β-delayed neutron emitters 137I and 95Rb have been studied with the total absorption γ-ray spectroscopy technique. The purity of the beams provided by the JYFLTRAP Penning trap at the ion guide isotope separator on-line facility in Jyväskylä allowed us to carry out a campaign of isotopically pure measurements with the decay total absorption γ-ray spectrometer, a segmented detector composed of 18 NaI(Tl) modules. The contamination coming from the interaction of neutrons with the spectrometer has been carefully studied, and we have tested the use of time differences between prompt γ rays and delayed neutron interactions to eliminate this source of contamination. Due to the sensitivity of our spectrometer, we have found a significant amount of β intensity to states above the neutron separation energy that deexcite by γ rays, comparable to the neutron emission probability. The competition between γ deexcitation and neutron emission has been compared with Hauser-Feshbach calculations, and it can be understood as a nuclear structure effect. In addition, we have studied the impact of the β-intensity distributions determined in this work on reactor decay heat and reactor antineutrino spectrum summation calculations. The robustness of our results is demonstrated by a thorough study of uncertainties and with the reproduction of the spectra of the individual modules and the module-multiplicity gated spectra. This work represents the state-of-the-art of our analysis methodology for segmented total absorption spectrometers.

Keywords: nuclear physics; astrophysics

Free keywords: beta decay; nuclear astrophysics; nuclear structure&decays

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Ministry reporting: Yes

Reporting Year: 2019

JUFO rating: 2