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Results of a search on the neutrinoless double beta decay of76Ge to the excited states of76Se

Результаты поисков безнейтринных двойных бета-распадов76Ge в возбужденные состояния76Se

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Il Nuovo Cimento A (1965-1970)

Summary

A search for neutrinoless double beta decays of76Ge into excited states of76Se has been carried out in the Frejus tunnel using a coincidence technique between Ge and NaI detectors. For the decay to the first excited stateJ π=2 +1 ,E=559.1 keV, no peak has been observed in the electron energy spectrum at the nominalQ value of (1481.6±0.5) keV commonly used (neither at the more recently measured of (1482.3±0.5) keV). From this a lower limit ofT 1/2>6·1022y may be established. However the experimental data display a coincidence, at the level of 2.5ϖ, between an energy deposition of (1483.7±0.5) keV in the Ge detector and (558±15 keV) in the NaI detector. The main features of such a coincidence effect are analysed and, in spite of its small statistical significance, its possible interpretation is discussed. For the decay to the second excited stateJ π=0 +2 ,E=1122.3 keV, no coincidence has been observed leading to a lower limitT 1/2>2·1022 y.

Riassunto

È stata eseguita una ricerca per i doppi decadimenti beta di76Ge senza neutrini in stati eccitati di76Se nel tunnel del Frejus usando una tecnica di coincidenza tra i rivelatori a Ge e NaI. Per il decadimento nel primo stato eccitatoJ π=2 +1 ,E=559.1 keV, non è stato osservato nessun picco nello spettro d'energia dell'elettrone al valore nominaleQ di (1481.6±0.5) keV usato communemente (né a quello misurato più recentemente di (1482.3±0.5) keV). Da questo si può determinare un limite inferiore diT 1/2>6·1022 y. Tuttavia i dati sperimentali mostrano una coincidenza al livello di 2.5ϖ, tra una deposizione d'energia di (1483.7±0.5) keV nel rivelatore a Ge e di (558±15) keV nel rivelatore a NaI. Sono analizzate le principali caratteristiche di un tale effetto di coincidenza e, nonostante il suo scarso significato statistico, si discute la sua possibile interpretazione. Per il decadimento nel secondo stato eccitatoJ π=0 +2 ,E=1122.3 keV, non è stata osservata nessuna coincidenza che porti ad un limite inferioreT 1/2>2·1022 y.

Резюме

Проводятся поиски безнейтринных двойных бета-распадов76Ge в возбужденные состояния76Se, используя технику совпадений между Ge и NaI детекторами. Для распада в первое возбужденное состояниеJ п=2 +1 ,E=559.1 кэВ не наблюдается пик в спектре энергий электрона при номинальной величинеQ, равной (1481±0.5) кеВ, которая обычно используется (ни при недавно измеренной величине (1482±0.5) кэВ). Из этого результата можно установить нижнии предел дляT 1/2>6·10 лет. Однако экспериментальные данные указывают на совпадение на уроане 2.5ϖ, между выделением энергии (1483.7±0.5) кэВ в Ge детекторе и (558±15) кэВ в NaI детекторе. Анализируются основные особенности такого эффекта совпаденнй и, несмотря на малую статистическую значимость, обсуждается возможная интерпретация этого эффекта. Пля распада во второе возбужденное состояниеJ π=0 +2 ,E=1122.3 кэВ не наблодается совпадений, приводящих к нижнему пределуT 1/2>2·1022 лет.

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  1. Laboratorio de Física Nuclear, Facultad de Ciencias, Universidad de Zaragoza, 50009, Zaragoza, Spagna

    A. Morales, J. Morales, R. Núñez-Lagos, J. Puimedón, J. A. Villar & A. Larrea

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Morales, A., Morales, J., Núñez-Lagos, R. et al. Results of a search on the neutrinoless double beta decay of76Ge to the excited states of76Se. Nuov Cim A 100, 525–551 (1988). https://doi.org/10.1007/BF02789497

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