SNS @ ORNL A unique neutrino (and neutron) source - University of Chicago
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SNS @ ORNL
A unique neutrino (and neutron) source…
Improvements in SNS Hg
target design have resulted
in a ~40% (permanent)
increase in SNS n flux
following first CsI[Na]
data release
(data-taking continues).
…that keeps getting better and better.
J.I. Collar, The Magnificent CEnNS, Nov. 2018
New germanium target at COHERENT
Inverted coax PPC
NIM A 665 (2011) 25
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA 2.9 kg
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
Finalized
•Best posible understanding of quenching factor required. Parasitic measurement of design
proprietary uses
NIN cross-section through new internal veto. ultra-low
details…
background
materials.
PPC ability to detect
sub-keV nuclear recoils
provides advantageous
CEnNS rate per
target mass.
arXiv:nucl-ex/0701012
New germanium target at COHERENT
Inverted coax PPC
NIM A 665 (2011) 25
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA 2.9 kg
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
Finalized
•Best posible understanding of quenching factor required. Parasitic measurement of design
proprietary uses
NIN cross-section through new internal veto. ultra-low
details…
(notice energy resolution…) background
materials.
Ongoing studies of
quenching factor and
signal identification
algorithms using small
PPC with same noise
specs (70eV FWHM) as
3kg COHERENT PPCs
arXiv:nucl-ex/0701012
New germanium target at COHERENT
Inverted coax PPC
NIM A 665 (2011) 25
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA 2.9 kg
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
Finalized
•Best posible understanding of quenching factor required. Parasitic measurement of design
proprietary uses
NIN cross-section through new internal veto. ultra-low
details…
background
materials.
PPC resolution and bckg will also
facilitate search for inelastic n scattering
NIM A 612 (2010) 303
Ongoing studies of
quenching factor and
signal identification
algorithms using small
PPC with same noise
specs (70eV FWHM) as
3kg COHERENT PPCs
arXiv:nucl-ex/0701012
New germanium target at COHERENT
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
•Best posible understanding of quenching factor required. Parasitic measurement of
NIN cross-section through new internal veto.
COHERENT
PPC
threshold
Present µn limit
(LSND)
arXiv:1311.5958
New germanium target at COHERENT
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
•Best posible understanding of quenching factor required. Parasitic measurement of
NIN cross-section through new internal veto.
Present µn limit
(LSND)
arXiv:1311.5958 (reactor ns)
New germanium target at COHERENT
• Use state-of-the-art PPC Ge technology to perform a precision measurement of OSU reactor
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was (repeat of
~1/4 for CsI[Na] first COHERENT result). PRA 11(1975)1347)
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
•Best posible understanding of quenching factor required. Parasitic measurement of
NIN cross-section through new internal veto.
FOUR new measurements
of low-energy Ge quenching
factor at UC
arXiv:1303.2686;1608.00957;1608.03588 (one additional at Duke)
new measurements
new info (preliminary)
New germanium target at COHERENT
• Use state-of-the-art PPC Ge technology to perform a precision measurement of OSU reactor
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was (repeat of
~1/4 for CsI[Na] first COHERENT result). PRA 11(1975)1347)
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
•Best posible understanding of quenching factor required. Parasitic measurement of
NIN cross-section through new internal veto.
FOUR new measurements
of low-energy Ge quenching
factor at UC
arXiv:1303.2686;1608.00957;1608.03588 (one additional at Duke)
new info
low-E QF behavior
is wildly unpredictable…
arXiv:1804.06457
New germanium target at COHERENT
• Use state-of-the-art PPC Ge technology to perform a precision measurement of
CEnNS. >800 events/yr from small array, with a signal/background of ~15 (this was
~1/4 for CsI[Na] first COHERENT result).
• Demonstrated analysis threshold of ~140eVee/650eVnr (>80% SA, no false
positives) allows measurement of full CEnNS recoil spectrum. Accompanying ongoing
effort in quenching factor characterization.
•Improved sensitivity to n electromagnetic properties, non-standard n interactions,
MiniBooNE/LSND anomaly (steriles), DM models…
• Two first detectors (=6kg) already funded at University of Chicago through DARPA
and NSF, two more sought. Demonstration of threshold and background during 2018
(1st detector Nov. 2018, 2nd Feb 2019). Start of data-taking at SNS ~summer 2019.
•Best posible understanding of quenching factor required. Parasitic measurement of
NIN cross-section through new internal veto.
Ongoing validation of
new approach at
NIN rejection, imposed
by space limitations at SNS.
(turn lemons into
lemonade: definitive
measurement of NIN cross-section, of interest for HALO)
HALO @ SNOLAB
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