High-resolution measurement of hypernuclear events in a nuclear emulsion with hard X-ray microscopy

Kasagi, A.; Hayashi, K.; Lin, P.M.; Nakazawa, K.; Nishimura, N.; Nyaw, A.N. L.; Saito, T.R.; Yoshida, J.; Yoshimoto, M.

doi:10.1140/epja/s10050-022-00830-7

High-resolution measurement of hypernuclear events in a nuclear emulsion with hard X-ray microscopy

A. Kasagi
(
- Gifu U. and
- Wako, RIKEN
)
,
K. Hayashi
(
- Gifu U.
)
,
P.M. Lin
(
- Gifu U.
)
,
K. Nakazawa
(
- Gifu U.
)
,
N. Nishimura
(
- Gifu U.
)

Oct 1, 2022

14 pages

Published in:

Eur.Phys.J.A 58 (2022) 10, 190

Published: Oct 1, 2022

DOI:

10.1140/epja/s10050-022-00830-7

View in:

Nuclear Science References

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Abstract: (Springer)

A high-resolution measurement method based on X-ray microscopy was developed to analyze double-strangeness hypernuclear events with a complex topology in a nuclear emulsion. In a feasibility study performed on

\alpha

-decay events in emulsions, the resolution of the X-ray microscopy in the focal plane was found to be 0.2 \upmu {\mathrm{m}}, which shows an improvement by

\sim 2.4

times to that of the optical microscopy used for conventional analysis. The extent to which the emulsion underwent modification as a result of X-ray irradiation was also evaluated. The modification mainly occurred in the form of a change in its thickness; however, this affection was adequately small to perform X-ray imaging if the duration of the irradiation was sufficiently short. Stereo imaging with X-ray microscopy improved the resolution by

\sim 2.5

times to 0.28 \upmu {\mathrm{m}} along the optical axis compared with the depth of field of the optical microscope, 0.7 \upmu {\mathrm{m}}. We applied the developed method to the study of a double-strangeness hypernuclear event. The uncertainty on the position of the vertex point and the binding energy of the

\Xi ^-

and

^{14}

N system was improved from 3 \upmu {\mathrm{m}} to 0.04 \upmu {\mathrm{m}} and

\pm 3

MeV to

\pm 0.86

MeV, respectively. The binding energy was deduced to be

-1.23 \pm 0.86~{\mathrm{MeV}}

, and this result indicates that a

\Xi ^-

atomic state is produced in the observed event.

X-ray: imaging
X-ray: irradiation
optical
hypernucleus
nuclear emulsion
binding energy
resolution
measurement methods

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