Back to Search Start Over

Precise determination of $^{12}_{\Lambda}$C level structure by $\gamma$-ray spectroscopy

Authors :
Hosomi, K.
Ma, T.
Ajimura, S.
Aoki, K.
Dairaku, S.
Fu, Y. Y.
Fujioka, H.
Futatsukawa, K.
Imoto, W.
Kakiguchi, Y.
Kawai, M.
Kinoshita, S.
Koike, T.
Maruyama, N.
Mimori, M.
Minami, S.
Miura, Y.
Miwa, K.
Miyagi, Y.
Nagae, T.
Nakajima, D.
Noumi, H.
Shirotori, K.
Suzuki, T.
Takahashi, T.
Takahashi, T. N.
Tamura, H.
Tanida, K.
Terada, N.
Toyoda, A.
Tsukada, K.
Ukai, M.
Zhou, S. H.
Publication Year :
2015

Abstract

Level structure of the $^{12}_{\Lambda}$C hypernucleus was precisely determined by means of $\gamma$-ray spectroscopy. We identified four $\gamma$-ray transitions via the $^{12}$C$(\pi^{+},K^{+}\gamma)$ reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet $(2^{-}_{1},1^{-}_{1})$ was measured to be $161.5\pm0.3\text{(stat)}\pm0.3\text{(syst)}$\,keV from the direct $M1$ transition. Excitation energies of the $1^{-}_{2}$ and $1^{-}_{3}$ states were measured to be $2832\pm3\pm4$\,keV and $6050\pm8\pm7$\,keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of $\Lambda$ hypernuclei.

Subjects

Subjects :
Nuclear Experiment
Nuclear Theory

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.1503.08372
Document Type :
Working Paper
Full Text :
https://doi.org/10.1093/ptep/ptv113