Yuri Kamyshkov/ University of Tennessee email:...
Transcript of Yuri Kamyshkov/ University of Tennessee email:...
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Yuri Kamyshkov/ University of Tennessee
email: [email protected]
February 25, 2016 Lecture 3 of 3 @ ORICL Philosophical Society
http://web.utk.edu/~kamyshko/ORICL/
All lectures will be posted at
Part 3. What DM can do to neutrons? What is next?
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• Dark Matter definitely exists, but the nature of DM is unknown;
• Dark Matter (or part of it) can be in the form of particles coming to Earth;
• DM interaction with OM is very weak (like ~ neutrino interactions)
and are mediated by a new unknown force of nature;
• Existing experimental observations indicate that masses of DM particles
are rather light (few amu) than heavy (thousands of amu);
• Hypothesis of Mirror Matter provides new viable paradigm of DM with DM
consisting of mirror H and He, mirror nuclei and atoms, stars, etc.
• Interaction between two worlds OM and MM (besides gravity) can be due to
exchange (mixing) of neutral particles: photons, neutrinos, neutrons,…
• Mirror H and He (from mirror galactic clouds) can be accumulated at Earth in
the form of unobservable for us mirror atmosphere of H and He and can create
undetectable for us mirror magnetic field inside the Earth.
• Today we’ll discuss how this picture of MM can be detectable with neutrons.
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Mass
Spin
Magnetic moment
Magnetic field
Earth gravity
Gas pressure
Neutron total energy
Neutron total energy
1 n nm m amu
12n n
s s
n n
(0 ) ; (?)Earth
B B B
g g
(1 atm vacuum); (?)p p
2 0mc KE B; B
2 0mc KE B ; B
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Spin of the neutron
and magnetic moment
Quark structure
of neutron
Magnetic needle aka
magnetic momentMagnetic needle
in Earth mag. fieldHigh and Low potential
energy of magnetic needle
Magnetic field of
magnetic moment
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http://www.youtube.com/watch?v=RoSYKPTdlxs
Two pendulums with close eigenfrequencies + small coupling
http://www.youtube.com/watch?v=Z5rKTagEsro&feature=related
Pendulums with different eigenfrequencies and small coupling
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n
nPeriod of free oscillations is determined by value of 𝜀
time
Complementarity
of Yin and Yang
means in vacuum
is mixed with
n n
n n
+ n n
“Two-level system in Quantum Mechanics”
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Neutron – mirror neutron oscillation in magnetic field
Energy
mixed with n n
+ n n
in vacuum
no no B, B 0B 0B
0B
E B
E BTime
E B
Uncertainty principle: E t
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To be consistent with Mirror Matter concepts the
presence of mirror magnetic field 𝑩 should be considered
http://pdg.lbl.gov
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(Z. Berezhiani, 2009)
2 2
2 2 2 2
2 2
2 2 2
( ) ( ) ( ) cos
sin ( ) sin ( )( )
2 ( ) 2 ( )
sin ( ) sin ( )( )
2 ( ) 2 (
B B B
B
P t p t d t
t tp t
t td t
Neutron disappearance in the presence of
where = and - oscillation time
assymetry
2
1 12 2
det
)
( ) ( )( ) ( ) cos
( ) ( )B B
B collis BB B
B B
N t N tA t N d t
N t N t
;
=
9
B
B
B
oscillations in the presence of n n B
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n'
Neutron reflected off the wall
Mirror neutron exiting trap
at typical B B
in case of successful guessing for the resonance enhancement is expected: theoscillation frequency will be reduced to (1/few s)and oscillation amplitude increased by few orders of magnitude, ul
B B
timately to
2
Pnn
nn
t
non-resonant magnetic field B B
observation timet
oscillation time > 1 secnn
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n n search at ILL / Grenoble (2007)/ A. Serebrov et al.
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PNPI Experiment to search for nn disappearance
at ILL/Grenoble reactor, A. Serebrov et al (2009)
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190 L volumestores ~ 500,000 ucn;with wall collision rate
~ 10/n/s
n lifetime in the trap is measured.
One measurement: 130 s filling;300 s storage; 130 s counting n’s
Magnetic field variation: 0.2 Gauss up/down
A.P. Serebrov et al, Experimental search for neutron–mirror neutron
oscillations using storage of ultra-cold neutrons (at ILL/Grenoble)
See also: Nuclear Instruments and Methods in Physics Research A 611 (2009) 137-140
Assuming zero mirror magnetic field oscillation time limit (90%CL) > 414 s
Bn n
(2008)
This is
“disappearance”
experiment
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Eur.Phys.J. C72 (2012) 1974
Serebrov’s experiment (2008) was re-analyzed with treatment of 𝐵 ≠ 0
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det ( ) ( )( )
( ) ( )B B
BB B
N t N tA t
N t N t
Measured asymmetry
~ (71.4)×104 (~5)
Magnetic anomaly in UCN trapping: signal for neutron oscillation to parallel world?
Z. Berezhiani and F. NestiEur. Phys. J. C72 (2012) 1974; also http://arxiv.org/abs/1203.1035
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Experimental search for n n with UCN of another group
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Attempt to find
resonance by
variation of mag.
field B
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B
See: Z. Berezhiani and F. NestiEur. Phys. J. C72 (2012) 1974http://arxiv.org/abs/1203.1035
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History of n lifetime
measurements,
PDG, 2014
Neutron Lifetime Measurements
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9.2 s => ~ 3 σor <1% probability of statistical fluctuation
A.T. Yue, et. al., (UTK),887.7 ± 1.2 ± 1.9 s
Dewey, et. al., (NIST),886.8 ± 1.2 ± 3.2 s
Serebrov, et. al.,878.5 ± 0.7 ± 0.3 s
PDG Weighted Average
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Particle Data Group (pdg.lbl.gov)
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Two Methods of Neutron Lifetime Measurement
• Proton appearance detected
• 4.6 T magnetic field
• 10 ms storage
• Cold neutrons, ~0.025 eV
• Neutron disappearance detected
• 4 x 10-5 T magnetic field
• ~700 s storage
• Ultracold neutrons, ~ 62.3 neV
Beam Measurement Bottle Measurement
M. S. Dewey et al., Phys. Rev. Lett. 91, 152302 (2003); A. P. Serebrov et al., Phys. Rev. C 78, 035505 (2008). 20
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at typical 𝐵 and 𝐵′
n'Mirror neutron has been resolved and will exit
Reflection from the wall
Via Oscillations nn’ Neutrons Can Interact with Mirror Particles
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• Neutrons remain within the trap. Due to the oscillations between ordinary and mirror states, there is a small chance that the mirror neutron component will interact with an accumulated MM gas particle. (Z. Berezhiani, YK , B.Kerbikov, L. Varriano paper in preparation)
at typical 𝐵 and 𝐵′
n'Mirror neutron has been resolved and will exit
Reflection from the wall
oscP
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in the beam of cold neutrons
n n ( )n n
Neutron total absorber
Neutron
detector
(neutron mirror neutron transformation) n n n
Z. Berezhiani, M. Frost, Y. K., B. Rybolt, “Neutron Regeneration from Sterile Mirror State”. Paper in preparation.
Search in the range of 𝜏 = 1 − 10 𝑠and scan for B = 0 0.5 Gauss
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23M. Frost UT/SNS
Tube diameter 0.5 m
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Neu
tro
ns
in d
etec
tor
/MW
s
B Field (mG)
Example scan in B with 𝜏 = 3, step ∆𝐵 = 5 𝑚𝐺
Assumes SNS neutron beam w/ 2x 15 meter pipe
B. Rybolt / UT
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• UCN experiments at ILL indicated anomaly: neutron disappear from the trap for “no good reason”. 5 effect. Possible explanation: they disappear due to n noscillations to sterile mirror state with oscillation time 𝜏 ~3 𝑠 , if mirror magnetic field in the lab 𝐵~ 0.11 Gauss.
• Neutron lifetime measurements show difference in measurements by two methods: disappearance and appearance. > 3 effect. Can be explained by n n oscillations + presence of mirror matter in the UCN vacuum trap.
• New regeneration experiment can be made at SNS that can confirm/refute the observations made at ILL with UCN by different method. In the range of interest the counting rates are large. By scan with mag. field B the resonance in regeneration can be revealed proving not only that neutrons can transform to sterile (mirror) state, but also that mirror magnetic field exists.
• These observations can be a demonstration of Mirror nature of Dark Matter with profound significance for particle physics and cosmology.