First determination of beta-delayed multiple neutron emission beyond A=100 through direct neutron measurement : The P-2n value of Sb-136

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Caballero-Folch , R , Dillmann , I , Agramunt , J , Tain , J L , Algora , A , Äystö , J , Calvino , F , Canete , L , Cortes , G , Domingo-Pardo , C , Eronen , T , Ganioglu , E , Gelletly , W , Gorelov , D , Guadilla , V , Hakala , J , Jokinen , A , Kankainen , A , Kolhinen , V S , Koponen , J , Marta , M , Mendoza , E , Montaner-Piza , A , Moore , I , Nobs , C R , Orrigo , S E A , Penttilä , H , Pohjalainen , J , Reinikainen , J , Riego , A , Rinta-Antila , S , Rubio , B , Salvador-Castineira , P , Simutkin , V , Tarifeno-Saldivia , A , Tolosa-Delgado , A & Vos , A 2018 , ' First determination of beta-delayed multiple neutron emission beyond A=100 through direct neutron measurement : The P-2n value of Sb-136 ' , Physical Review C , vol. 98 , no. 3 , 034310 . https://doi.org/10.1103/PhysRevC.98.034310

Title: First determination of beta-delayed multiple neutron emission beyond A=100 through direct neutron measurement : The P-2n value of Sb-136
Author: Caballero-Folch, R.; Dillmann, I.; Agramunt, J.; Tain, J. L.; Algora, A.; Äystö, J.; Calvino, F.; Canete, L.; Cortes, G.; Domingo-Pardo, C.; Eronen, T.; Ganioglu, E.; Gelletly, W.; Gorelov, D.; Guadilla, V.; Hakala, J.; Jokinen, A.; Kankainen, A.; Kolhinen, V. S; Koponen, J.; Marta, M.; Mendoza, E.; Montaner-Piza, A.; Moore, I.; Nobs, C. R.; Orrigo, S. E. A.; Penttilä, H.; Pohjalainen, J.; Reinikainen, J.; Riego, A.; Rinta-Antila, S.; Rubio, B.; Salvador-Castineira, P.; Simutkin, V.; Tarifeno-Saldivia, A.; Tolosa-Delgado, A.; Vos, A.
Contributor: University of Helsinki, Helsinki Institute of Physics
Date: 2018-09-10
Language: eng
Number of pages: 10
Belongs to series: Physical Review C
ISSN: 2469-9985
URI: http://hdl.handle.net/10138/246115
Abstract: Background: beta-delayed multiple neutron emission has been observed for some nuclei with A 100 to test the predictions of theoretical models and simulation tools for the decays of heavy nuclei in the region of very neutron-rich nuclei. In addition the decay properties of these nuclei are fundamental for the understanding of astrophysical nucleosynthesis processes such as the r-process and safety inputs for nuclear reactors. Purpose: To determine for the first time the two-neutron branching ratio the P-2n value for Sb-136 through a direct neutron measurement and to provide precise P-1n values for Sb-136 and Te-136. Method: A pure beam of each isotope of interest was provided by the JYFLTRAP Penning trap at the Ion Guide Isotope Separator On-Line (IGISOL) facility of the University of Jyvaskyla Finland. The purified ions were implanted into a moving tape at the end of the beam line. The detection setup consisted of a plastic scintillator placed right behind the implantation point after the tape to register the beta decays and the BELEN detector based on neutron counters embedded in a polyethylene matrix. The analysis was based on the study of the beta- and neutron-growth-and-decay curves and the beta-one-neutron and beta-two-neutron time correlations which allowed us the determination of the neutron branching ratios. Results: The P-2n value of Sb-136 was found to be 0.14(3)% and the measured P-1n values for Sb-136 and Te-136 were found to be 32.2(15)% and 1.47(6)% respectively. Conclusions: The measured P-2n value is a factor 44 smaller than predicted by the finite-range droplet model plus the quasiparticle random-phase approximation (FRDM+QRPA) model used for r-process calculations.
Subject: HALF-LIVES
PROBABILITIES
PRECURSORS
ISOTOPES
REGION
IGISOL
SYSTEM
DECAY
114 Physical sciences
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