The cold preamplifier set-up of CUORICINO: Towards 1000 channels Arnaboldi, C.; Pessina, G.; Pirro, S.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2006, Letnik:
559, Številka:
2
Journal Article
Recenzirano
We present the characterization of the cold preamplifier set-up of the CUORICINO Experiment. It consists of two single boxes located inside the cryostat, linked to the 4.2
K stage. Each box has 12 ...independent differential buffer channels, composed of 12 pairs of Silicon JFET transistors in source follower configuration and 48 pairs of load resistors
(
6.8
G
Ω
×
8
units
/
channel
)
for thermistor biasing. The operating temperature of the JFETs is
∼
110
K
. The figure of merit of the set-up is a series input noise of about
35
nV
RMS
in the 0–12
Hz detector bandwidth. Parallel noise is limited only by the load resistors
(
54
G
Ω
)
to be about
1.2
fA
RMS
. In order to build a 1000 channels bolometric array a further progress in the performances of the cold stage has been studied.
A search for axioelectric absorption of solar axions produced in the
p
+
d
→
3
He
+
γ
(
5.5
MeV
)
reaction has been performed with a BGO detector placed in a low-background setup. A model-independent ...limit on the combination of axion–nucleon and axion–electron coupling constants has been obtained:
|
g
A
e
×
g
A
N
3
|
<
1.9
×
10
-
10
for 90 % confidence level. The constraint of the axion–electron coupling constant has been obtained for hadronic axion with masses of (0.1–1) MeV:
|
g
A
e
|
≤
(
0.96
-
8.2
)
×
10
-
8
.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
At present the results in the field of direct dark matter search are in tension: the positive claim of DAMA/LIBRA versus null results from other experiments. However, the comparison of the results of ...different experiments involves model dependencies, in particular because of the different target materials in use. The COSINUS R&D project aims to operate NaI as a cryogenic calorimeter. Such a detector would not only allow for a direct comparison to DAMA/LIBRA, but would also provide a low(er) nuclear recoil threshold and particle discrimination.
In the Standard Model of electroweak interactions an important input parameter is still missing: the absolute value of the mass of one of the neutrinos. In this paper we report the final results of ...the Milano electron anti-neutrino mass experiment after having measured for about one year the beta spectrum of 187Re with 10AgReO4 microcalorimeters. We describe the experimental set-up, the detector performance and the measuring conditions. We present the updated limit on the electron anti-neutrino mass which is the most stringent so far obtained with thermal detectors. We also give the most precise estimates for the 187Re transition energy and lifetime.
Development of bolometric light detectors for double beta decay searches Pirro, S.; Arnaboldi, C.; Beeman, J.W. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
04/2006, Letnik:
559, Številka:
2
Journal Article
Recenzirano
We present the results achieved in the development of bolometric light detectors for double beta searches. A light detector with a considerable large area
(
35
cm
2
)
was constructed and run in a ...test measurement. A 140
g
CdWO
4
crystal was operated as bolometer and the scintillation light was read by the light detector. The excellent results obtained in a long background measurement combined with extreme easy light detector assembly represent the first tangible proof demonstrating the feasibility of this kind of technique.
Future experiments on neutrinoless double beta-decay with the aim of exploring the inverted hierarchy region have to employ detectors with excellent energy resolution and zero background in the ...energy region of interest. Cryogenic scintillating bolometers turn out to be a suitable candidate since they offer particle discrimination: the dual channel detection of the heat and the scintillation light signal allows for particle identification. In particular such detectors permit for a suppression of α-induced backgrounds, a key-issue for next-generation tonne-scale bolometric experiments. We report on the progress and current status of the LUCIFER/CUPID-0 demonstrator, the first array of scintillating bolometers based on enriched Zn82Se crystals which is expected to start data taking in 2016 and the potential of this detection technique for a future tonne-scale bolometric experiment after CUORE.
Complete elimination of 1K Pot vibrations in dilution refrigerators Gorla, P.; Bucci, C.; Pirro, S.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
03/2004, Letnik:
520, Številka:
1-3
Journal Article
Recenzirano
Odprti dostop
Cryogenic vibrations generated by continuously filled 1K Pots are a well known source of noise in all cryogenic experiments using dilution refrigerators. Starting from recent developments we realized ...a non invasive modification to the cryostat that completely eliminated vibrations, thermalizing the helium coming from the main bath at the pot temperature. We describe the new experimental setup and complete study of the phenomena.
We report on the measurement of the two-neutrino double-β decay of ^{82}Se performed for the first time with cryogenic calorimeters, in the framework of the CUPID-0 experiment. With an exposure of ...9.95 kg yr of Zn^{82}Se, we determine the two-neutrino double-β decay half-life of ^{82}Se with an unprecedented precision level, T_{1/2}^{2ν}=8.60±0.03(stat) _{-0.13}^{+0.19}(syst)×10^{19} yr. The very high signal-to-background ratio, along with the detailed reconstruction of the background sources allowed us to identify the single state dominance as the underlying mechanism of such a process, demonstrating that the higher state dominance hypothesis is disfavored at the level of 5.5σ.
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