► New methodology for supernova detection with IceCube. ► New observables granting access to neutrino emission spectrum. ► IceCube extension for routine supernova detection.
The current supernova ...detection technique used in IceCube relies on the sudden deviation of the summed photomultiplier noise rate from its nominal value during the neutrino burst, making IceCube a ≈3 Megaton effective detection volume – class supernova detector. While galactic supernovae can be resolved with this technique, the supernova neutrino emission spectrum remains unconstrained and thus presents a limited potential for the topics related to supernova core collapse models.
The paper elaborates analytically on the capabilities of IceCube to detect supernovae through the analysis of hits in the detector correlated in space and time. These arise from supernova neutrinos interacting in the instrumented detector volume along single strings. Although the effective detection volume for such coincident hits is much smaller (≳35kton, about the scale of SuperK), a wealth of information is obtained due to the comparatively low rate of coincident noise hits. We demonstrate that a neutrino flux from a core collapse supernova will produce a signature enabling the resolution of rough spectral features and, in the case of a strong signal, providing indication on its location.
We further discuss the enhanced potential of a rather modest detector extension, a denser array in the center of IceCube, within our one dimensional analytic calculation framework. Such an extension would enable the exploration of the neutrino sky above a few GeV and the detection of supernovae up to a few 100’s of kilo parsec. However, a 3–4Mpc detection distance, necessary for routine supernova detection, demands a significant increase of the effective detection volume and can be obtained only with a more ambitious instrument, particularly the boosting of sensor parameters such as the quantum efficiency and light collection area.
A scintillator hodoscope for experiments at proton storage rings Pauly, C.; Demirörs, L.; Stark, Y. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/2005, Letnik:
547, Številka:
2
Journal Article
Recenzirano
A versatile scintillator hodoscope with two dimensional position sensitivity and good time resolution has been installed at the CELSIUS ion storage ring of the The Svedberg Laboratory. It is designed ...to be easily inserted into a package of range-measuring hodoscopes. We report on resolution and efficiency features that have been studied with reaction products from stored protons of energies 1360 and 1450
MeV impinging on a proton or deuteron pellet target. Among first applications are reconstructions of missing masses in pp reactions and of neutrons in
η
meson production via
pd
→
pn
η
p
s
with a spectator proton
p
s
.
At the Cooler Synchrotron COSY/Jülich spin-correlation parameters in elastic proton-proton (pp) scattering have been measured with a 2.11 GeV polarized proton beam and a polarized hydrogen atomic ...beam target. We report results for A(NN), A(SS), and A(SL) for c.m. scattering angles between 30 degrees and 90 degrees. Our data on A(SS)--the first measurement of this observable above 800 MeV--clearly disagrees with predictions of available pp scattering phase-shift solutions while A(NN) and A(SL) are reproduced reasonably well. We show that in the direct reconstruction of the scattering amplitudes from the body of available pp elastic scattering data at 2.1 GeV the number of possible solutions is considerably reduced.
The WASA detector facility at CELSIUS Bargholtz, Chr; Bashkanov, M.; Berłowski, M. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
09/2008, Letnik:
594, Številka:
3
Journal Article
Recenzirano
Odprti dostop
The WASA
4
π
multidetector system, aimed at investigating light meson production in light ion collisions and
η
meson rare decays at the CELSIUS storage ring in Uppsala is presented. A unique feature ...of the system is the use of hydrogen pellets as internal targets for the first time. A detailed description of the design, together with the anticipated and achieved performance parameters are given.
Excitation functions of the differential cross sections
dσ
dgw
, analyzing powers
A
N
and spin correlation parameters
A
NN
,
A
SS
and
A
SL
have been measured with internal targets at the Cooler ...Synchrotron COSY. Data were taken continously during the acceleration and deceleration of the internal beam for kinetic energies between 450 and 2500 MeV and scattering angles 30° ⩽ σ
cm
⩽ 90°. Details of the experimental method are presented. The results provide excitation functions and angular distributions of high precision and internal consistency. No evidence for narrow structures are found. Upper limits on the coupling of narrow resonances to elastic scattering in the mass range √
s = 2.2…2.8 GeV are deduced. The data have significant impact on phase shift solutions.
The reaction pd→He3η at threshold was used to provide a clean source of η mesons for decay studies with the WASA detector at CELSIUS. The branching ratio of the decay η→π+π−e+e− is measured to be ...(4.3±1.3±0.4)×10−4.
Excitation functions A(N)(p(p),Theta(c.m.)) of the analyzing power in pp--> elastic scattering have been measured with a polarized atomic hydrogen target for projectile momenta p(p) between 1000 and ...3300 MeV/ c. The experiment was performed for scattering angles 30 degrees </=Theta(c.m.)</=90 degrees using the recirculating beam of the proton storage ring COSY during acceleration. The resulting excitation functions and angular distributions of high internal consistency have significant impact on the recent phase shift solution SAID SP99, in particular, on the spin triplet phase shifts between 1000 and 1800 MeV, and demonstrate the limited predictive power of single-energy phase shift solutions at these energies.
We present a search based on a time dependent neutrino flux prediction from the X–ray binary LS I +61 303. Results from data taken with the 22 and 40 strings of IceCube are compatible with background ...fluctuations.
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