-
A A
A
2015.11.26 @ 1
-
temperature (K)910 710 510 310 110 10 210
)3de
nsity
(/cm
310
610
910
1210
1510
18101910
Rb87
H1
Ps
199587Rb
19981H
(Ps)-BEC
Ps
PsBECe.g.) ~10K @ 1018/cc
1995BECBEC
BEC
Ps-BECp
p
511keV
BEC
2
-
Ps-BEC
3
o-Ps142ns1. Ps2. ~1K
~1KSiPsP. M. Platzman and A. P. Mills
Ps
Ps P. M. Platzmanand A. P. Mills, Jr, Phys. Rev. B 49,
454(1994)
-
4
Submitted to Journal of Physics B, arXiv: ~300K ~1K
Magnified view
Positron beam
107 /bunch
Laser beams from six directions
Internal void100nm 100nm 100nm
Cooled cavity made by silicawhich is transparent to the
laser
4103Ps
-
Energy (eV)0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
(a.m
.u)
MSi
lica
Effe
ctiv
e M
ass
210
310DBS(1987)ACAR(1995)ACAR(1998)
(2013)/32
5
Ps: from Y. Nagashima et al. Phys. Rev. A, 52, 258(1995)
dEavdt
= 2LM
2mPsEav
(Eav
3
2kBT
)
M
DBS(1987): T. Chang et al. Phys. Lett. A 126, 189ACAR1995: Y.
Nagashima et al. Phys. Rev. A 52, 258ACAR1998: Y. Nagashima et al.
J. Phys. B 31, 3292/3(2013) K. Shibuya et al. Phys. Rev. A 52,
258
Eav : Ps, mPs : Ps, L : ,
M : , T :
M
MY. Nagashima et al. J. Phys. B 31, 329(1998)
() = ' + ) exp
-./
-
6
Ps Ps
Ps 0.8eV
from Y. Nagashima et al. Phys. Rev. A 52, 258(1995)
Ps 4104
100nm100nm 100nm1K
p ~100ns~300Kp BEC 300K
Time (ns)0 100 200 300 400 500 600
Tem
pera
ture
(K)
1
10
210
310~100ns
-
Ps Ps
7
Ps=322from Journal of the Physical Society of Japan 70,
1549(2001)
Phys. Rev. A 65, 022704(2002)
Energy (eV)0 0.5 1 1.5 2 2.5 3 3.5 4
Arb.
0
0.2
0.4
0.6
0.8
1
10Maxwell-Botlzmann1018/cm3
-
8
Ps 0.8eV Ps 4108
100nm100nm 100nm1K
Ps Ps
42 J 1.23PHz-(t)
(t) (0ns)=300GHz(300ns)=240GHz
2 140GHz2 300 ns
2 200 m
Ps
-
9
(m/s)xV400 200 0 200 400
310
Num
ber o
f Par
ticle
s(/4
.5 k
m/s
)
050
100150200250300350400
x
t=0ns
t=400ns
t=400ns
10K
70K
-
10
TC
Time (ns)0 100 200 300 400 500 600
Tem
pera
ture
(K)
1
10
210
310
BEC
Ps
-
11
SHG THG
EOM2Sideband Generator
Ti:Sapphire
EOM1Frequency Shifter
243 nm729 nm365 nm
injection seeded Ti:sapphire laser
40uJ
10mJ
Q-switchedPump Laser
-
BEC
12
1. p p
DBS
2. p
3. p 107100nm
-
13
Ps-BEC+ ~300K ~1K BEC
1. 2. Ps Ps 3.
3Ps Ps
BEC 10GHz100ns
