Status and future prospect of 48Ca double beta decay search in CANDLES

Iida, Tsutomu; Nakajima, K.; Ajimura, S.; Batpurev, T.; Chan, W. M.; Fushimi, K.; Hazama, R.; Kakubata, H.; Khai, B. T.; Kishimoto, T.; Li, X; Maeda, Tsuyoshi; Masuda, Akihiko; Matsuoka, K.; Morishita, K.; Nakatani, Noboru; Nomachi, M.; Noshiro, S.; Ogawa, Izumi; Ohata, Toshihiro; Osumi, H.; Suzuki, K.; Tamagawa, Y.; Tesuno, K; Trang, V. T. T.; Uehara, Takuya; Umehara, S.; Yoshida, S.

doi:10.1088/1742-6596/718/6/062026

Cited by 23 publications

(16 citation statements)

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“…In ββ decay, they produce intermediate states in Eqs. (7) and (14) and one must carry out two separate QRPA calculations, one based on the initial nucleus as the BCS vacuum, and a second on the final nucleus. (The closure approximation is not required.)…”

Section: B the Qrpa And Some Of Its Variantsmentioning

confidence: 99%

Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review

2017

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The nuclear matrix elements that govern the rate of neutrinoless double beta decay must be accurately calculated if experiments are to reach their full potential. Theorists have been working on the problem for a long time but have recently stepped up their efforts as ton-scale experiments have begun to look feasible. Here we review past and recent work on the matrix elements in a wide variety of nuclear models and discuss work that will be done in the near future. Ab initio nuclearstructure theory, which is developing rapidly, holds out hope of more accurate matrix elements with quantifiable error bars. CONTENTS

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Section: B the Qrpa And Some Of Its Variantsmentioning

confidence: 99%

Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review

2017

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“…Present DGT GR searches use the lightest ββ emitter 48 Ca as target. Several experimental [37][38][39] and theoretical works [14,[40][41][42][43][44][45][46] have investigated the 0νββ decay of this nucleus. In this Letter we analyze the 48 Ca DGT strength distribution in connection to 0νββ decay.…”

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confidence: 99%

Double Gamow-Teller Transitions and its Relation to Neutrinoless ββ Decay

2018

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We study the double Gamow-Teller (DGT) strength distribution of ^{48}Ca with state-of-the-art large-scale nuclear shell model calculations. Our analysis shows that the centroid energy of the DGT giant resonance depends mostly on the isovector pairing interaction, while the resonance width is more sensitive to isoscalar pairing. Pairing correlations are also key in neutrinoless ββ (0νββ) decay. We find a simple relation between the centroid energy of the ^{48}Ca DGT giant resonance and the 0νββ decay nuclear matrix element. More generally, we observe a very good linear correlation between the DGT transition to the ground state of the final nucleus and the 0νββ decay matrix element. The correlation, which originates on the dominant short-range character of both transitions, extends to heavier systems including several ββ emitters and also holds in energy-density functional results. Our findings suggest that DGT experiments can be a very valuable tool to obtain information on the value of 0νββ decay nuclear matrix elements.

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“…Light-concentration system including light pipes is placed between LS vessel and PMTs to increase photo-coverage [2]. In order to increase the light output of CaF 2 and collection efficiency of PMTs, we install the magnetic cancellation system and keep detector running at 2 o C [3]. Everything is mounted in a stainless-steel cylindrical water tank with 4 m of height and 3 m of diameter.…”

Section: Candles Experimentsmentioning

confidence: 99%

$\mu$ TCA DAQ System and Parallel Reading in CANDLES Experiment

Khai

Ajimura

Kanagawa

et al. 2019

IEEE Trans. Nucl. Sci.

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A new µTCA DAQ system was introduced in CANDLES experiment with SpaceWire-to-GigabitEthernet (SpaceWire-GigabitEthernet) network for data readout and Flash Analog-to-Digital Converters (FADCs). With SpaceWire-GigabitEthernet, we can construct a flexible DAQ network with multi-path access to FADCs by using off-the-shelf computers. FADCs are equipped 8 event buffers, which act as de-randomizer to detect sequential decays from the background. SpaceWire-GigabitEthernet has high latency (about 100 µsec) due to long turnaround time, while GigabitEthernet has high throughput. To reduce dead-time, we developed the DAQ system with 4 "crateparallel" (modules in crates are read in parallel) reading threads. As a result, the readout time is reduced by 4 times: 40 msec down to 10 msec. With improved performance, it is expected to achieve higher background suppression for CANDLES experiment. Moreover, for energy calibration, "event-parallel" reading process (events are read in parallel) is also introduced to reduce measurement time. With 2 "event-parallel" reading processes, the data rate is increased 2 times.

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Status and future prospect of 48Ca double beta decay search in CANDLES

Cited by 23 publications

References 1 publication

Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review

Status and future of nuclear matrix elements for neutrinoless double-beta decay: a review

Double Gamow-Teller Transitions and its Relation to Neutrinoless ββ Decay

$\mu$ TCA DAQ System and Parallel Reading in CANDLES Experiment

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