First observation of laser induced resonant annihilation in metastable anti-protonic helium atoms

We have observed the first laser-induced resonant transitions in antiprotonic helium atoms. These occur between metastable states and Auger dominated short lived states, and show that the anomalous longevity of antiprotons previously observed in helium media results from the formation of high-n high-l atomic states of p¯He+. The observed transition with vacuum wavelength 597.259±0.002 nm is tentatively assigned to (n,l)=(39,35)→(38,34).

anti-p nucleus: annihilation
annihilation: anti-p nucleus
atom: hadronic atom
anti-p: hadronic atom
helium: hadronic atom
hadronic atom: lifetime
energy levels: hadronic atom
radiation: laser
experimental results
CERN LEAR

References(6)

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Discovery of anti-proton trapping by longlived metastable states in liquid helium

M. Iwasaki
(
- Tokyo U. and
- Tokyo U., Meson Sci. Lab
)
,
S.N. Nakamura
(
- Tokyo U. and
- Tokyo U., Meson Sci. Lab
)
,
K. Shigaki
(
- Tokyo U. and
- Tokyo U., Meson Sci. Lab
)
,
Y. Shimizu
(
- Tokyo U. and
- Tokyo U., Meson Sci. Lab
)
,
H. Tamura
(
- Tokyo U. and
- Tokyo U., Meson Sci. Lab
)

et al.

- Phys.Rev.Lett. 67 (1991) 1246-1249,
- In *Nakai, K. (ed.), Ohshima, T. (ed.): KEK-PS 1990-1994* 291-294,
- Tokyo U. - INS-0878 (91/05,rec.Jun.) 13 p. Tsukuba KEK - KEK-Prepr.-91-043 (91/05,rec.Jun.) 13 p
•
DOI:
- 10.1103/PhysRevLett.67.1246