Speaker
Description
A. Algora1,2, V. Guadilla3, J. L. Tain1, M. Fallot4, M. Estienne4, A. Porta4, L. Giot4, L. Le Meur4, A. Beloeuvre et al. for the DTAS Jyvaskyla Collaboration
1)Instituto de Física Corpuscular, CSIC-Univ. de Valencia, E-46071 Valencia, Spain
2)Institute of Nuclear Research (ATOMKI), P.O. Box 51, H-4001 Debrecen, Hungary
3)Faculty of Physics, University of Warsaw, 02-093, Warsaw, Poland
4)Subatech, IMT-Atlantique, Univ. de Nantes, CNRS-IN2P3, F-44307, Nantes, France
Total absorption spectroscopy provides beta decay data free from the Pandemonium systematic error [1-3]. Avoiding this systematic error is of great relevance for nuclear structure, astrophysics and practical applications [3].
In this contribution we will present an overview of recent results from the research work performed by our collaboration employing this technique, which is relevant for reactor applications, in particular for decay heat summation calculations. The measurements, we are presenting here, have been performed at the University of Jyväskylä IGISOL IV Facility [4] using trap-assisted spectroscopy that provided radioactive beams of very high isotopic purity [5].
In this presentation we will emphasize mainly on highlights coming from our experimental campaign performed in 2014 [6-10] where special emphasis was devoted to cases that required isomeric separation [8]. This data has been shown to be of relevance in calculations of the decay heat and in calculations of the antineutrino spectrum from reactors [3,11]. The impact of the new results in nuclear structure and astrophysics will also be discussed. Some of the studied cases are beta delayed neutron emitters, for which gamma competition above the neutron separation energy has been determined [9]. In the framework of these analyses a new procedure to determine ground state to ground state feedings has also been introduced [10].
The impact of all the measurements performed until know by our collaboration for reactor decay heat calculations will be also discussed [12-16] and future perspectives presented.
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[2] B. Rubio et al., Journal of Physics G: Nuclear and Particle Physics 31, S1477 (2005)
[3] A. Algora et al., Eur. Phys. J. A 57, 85 (2021)
[4] I. D. Moore et al., Nucl. Instrum. and Methods B 317,208 (2013)
[5] T. Eronen et al., Eur. Phys. J. A 48, 46 (2012)
[6] V. Guadilla, PhD Thesis, Univ. of Valencia, Spain, (2017)
[7] L. Lemeur, PhD Thesis, Univ. of Nantes, France, (2018)
[8] V. Guadilla et al., Phys. Rev. Lett. 122, 042502 (2019)
[9] V. Guadilla et al., Phys. Rev. C 100, 044305 (2019)
[10] V. Guadilla et al, Phys. Rev. C 102, 064304 (2020)
[11] M. Estienne et al., Phys. Rev. Lett. 123, 022502 (2019)
[12] A. Algora et al., Phys. Rev. Lett. 105, 202501 (2010)
[13] D. Jordan et al., Phys. Rev. C 87, 044318 (2013)
[14] A. A. Zakari-Issoufou et al., Phys. Rev. Lett. 115, 102503 (2015)
[15] J. L. Tain et al., Phys. Rev. Lett. 115, 062502 (2015)
[16] E. Valencia et al., Phys. Rev. C 95, 024320 (2017)
[17] S. Rice et al., Phys. Rev. C 96, 014320 (2017)
[18] V. Guadilla et al., Phys. Rev. C C 100, 024311 (2019)