Optimization of the composition of Nd-containing scintillator to increase its light output and stability

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Resumo

Based on Nd(III) 3,5,5-trimethylhexanoate and an additional solvent TBP, the composition of a liquid organic scintillator for the determination of double neutrinoless β-decay was developed in LAB. IR spectroscopy has shown that TBP forms additional coordination bonds with neodymium carboxylate and thereby prevents its hydrolysis and polymerization. It has been shown that the optimal method for studying the purity and stability of a scintillator is UV spectrophotometry. The light yield of the scintillator composition [LAB + BPO (3 g/l) + TBP (6.3%) + Nd (5.9 ± 0.2 g/l)] is 78% relative to the scintillator [LAB + BPO (3 g/l)].

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Sobre autores

A. Veresnikova

Institute for Nuclear Research of the Russian Academy of Sciences; Kabardino-Balkarian State University named after H. M. Berbekov

Email: g-novikova@mail.ru
Rússia, Moscow; Nalchik

Z. Isupova

Kabardino-Balkarian State University named after H. M. Berbekov

Email: g-novikova@mail.ru
Rússia, Nalchik

B. Lokshin

A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences

Email: g-novikova@mail.ru
Rússia, Moscow

V. Morgalyuk

A. N. Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences

Email: g-novikova@mail.ru
Rússia, Moscow

A. Nemeryuk

NRC “Kurchatov Institute”– IREA

Email: g-novikova@mail.ru
Rússia, Moscow

G. Novikova

Institute for Nuclear Research of the Russian Academy of Sciences; Kabardino-Balkarian State University named after H. M. Berbekov

Autor responsável pela correspondência
Email: g-novikova@mail.ru
Rússia, Moscow; Nalchik

S. Elcheparova

Kabardino-Balkarian State University named after H. M. Berbekov

Email: g-novikova@mail.ru
Rússia, Nalchik

E. Yanovich

Institute for Nuclear Research of the Russian Academy of Sciences; Kabardino-Balkarian State University named after H. M. Berbekov

Email: g-novikova@mail.ru
Rússia, Moscow; Nalchik

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2. Fig. 1. UV spectra of LAB: 1 – LAB purified on Al2O3 (Fluka), 2 – original LAB.

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3. Fig. 2. UV absorption spectra of TBP: 1 — TBP (99%, Merck), 2 — TBP (99%, Chemical Line).

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4. Fig. 3. IR spectrum of TBP (Merck).

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5. Fig. 4. IR spectrum of 0.5M solution of Nd(TMHA)3 in TBP (Merck).

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6. Fig. 5. IR spectrum of dry salt Nd(TMHA)3.

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7. Fig. 6. UV spectra: 1 — LAB, 2 — LAB + BPO, 3 — LAB + PPO (Aldrich), 4 — LAB + PPO (Reakhim 1992, batch 8). Concentrations of all additives are 3 g/l.

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8. Fig. 7. Amplitude spectra of 137Cs (662 keV) in LAB-based scintillators: 1 — LAB + VRO (3 g/l), 2 — Nd-LS (stored under argon for 48 days + under air for 24 days), 3 — Nd-LS (stored under air for 72 days).

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9. Fig. 8. UV spectra of Nd-LS: 1 - sample stored under argon for 48 days, 2 - sample stored under air for more than two months.

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10. Fig. 9. UV spectra of LAB: 1 – LAB purified on Al2O3 (Fluka), 2 – LAB after storage in air for two months.

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