/ nucl-ex arXiv:1712.07608


First Determination of Level Structure of an $sd$-Shell Hypernucleus, $\rm {^{19}_{\Lambda}F}$


Yang, S.B. (CCAST World Lab, Beijing) ; Ahn, J.K. (CCAST World Lab, Beijing) ; Akazawa, Y. (Korea U.) ; Aoki, K. (Tohoku U.) ; Chiga, N. (KEK, Tsukuba) ; Ekawa, H. (Tohoku U.) ; Evtoukhovitch, P. (Kyoto U.) ; Feliciello, A. (Dubna, JINR) ; Fujita, M. (INFN, Turin) ; Hasegawa, S. (Tohoku U.) ; Hayakawa, S. (JAEA, Ibaraki) ; Hayakawa, T. (Osaka U., Inst. Phys.) ; Honda, R. (Osaka U., Inst. Phys.) ; Hosomi, K. (Osaka U., Inst. Phys.) ; Hwang, S.H. (JAEA, Ibaraki) ; Ichige, N. (KRISS, Taejon) ; Ichikawa, Y. (Tohoku U.) ; Ikeda, M. (JAEA, Ibaraki) ; Imai, K. (Tohoku U.) ; Ishimoto, S. (JAEA, Ibaraki) ; Kanatsuki, S. (KEK, Tsukuba) ; Kim, S.H. (Kyoto U.) ; Kinbara, S. (Korea U.) ; Kobayashi, K. (Gifu U.) ; Koike, T. (Osaka U., Inst. Phys.) ; Lee, J.Y. (Tohoku U.) ; Miwa, K. (Seoul Natl. U., Dept. Phys. Astron.) ; Moon, T.J. (Tohoku U.) ; Nagae, T. (Seoul Natl. U., Dept. Phys. Astron.) ; Nakada, Y. (Kyoto U.) ; Nakagawa, M. (Osaka U., Inst. Phys.) ; Ogura, Y. (Osaka U., Inst. Phys.) ; Sakaguchi, A. (Tohoku U.) ; Sako, H. (Osaka U., Inst. Phys.) ; Sasaki, Y. (JAEA, Ibaraki) ; Sato, S. (Tohoku U.) ; Shirotori, K. (JAEA, Ibaraki) ; Sugimura, H. (Osaka U., Res. Ctr. Nucl. Phys.) ; Suto, S. (JAEA, Ibaraki) ; Suzuki, S. (Tohoku U.) ; Takahashi, T. (KEK, Tsukuba) ; Tamura, H. (KEK, Tsukuba) ; Tanida, K. (Tohoku U.) ; Togawa, Y. (JAEA, Ibaraki) ; Tsamalaidze, Z. (Tohoku U.) ; Ukai, M. (Dubna, JINR) ; Wang, T.F. (Tohoku U.) ; Yamamoto, T.O. (CCAST World Lab, Beijing)

Abstract: We report on the first observation of $\gamma$ rays emitted from an $sd$-shell hypernucleus, $\rm ^{19}_{\Lambda}F$. The energy spacing between the ground state doublet, $1/2^{+}$ and $3/2^{+}$ states, of $\rm ^{19}_{\Lambda}F$ is determined to be $\rm 315.5 \pm 0.4 (stat) ^{+0.6}_{-0.5} (syst)~keV$ by measuring the $\gamma$-ray energy from the $M1(3/2^{+} \rightarrow 1/2^{+})$ transition. In addition, three $\gamma$-ray peaks were observed and assigned as $E2(5/2^{+} \rightarrow 1/2^{+})$, $E1(1/2^{-} \rightarrow 1/2^{+})$, and $E1(1/2^{-} \rightarrow 3/2^{+})$ transitions. The excitation energies of the $5/2^{+}$ and $1/2^{-}$ states are determined to be $\rm 895.2 \pm 0.3 (stat) \pm 0.5 (syst)~keV$ and $\rm 1265.6 \pm 1.2 (stat) ^{+0.7}_{-0.5} (syst)~keV$, respectively. It is found that the ground state doublet spacing is well described by theoretical models based on existing $s$- and $p$-shell hypernuclear data.

Web-Page: http://inspirehep.net/record/1644444/files/fig2ver3mod5.png; http://inspirehep.net/record/1644444/files/fig4ver3mod4.png; http://inspirehep.net/record/1644444/files/fig1ver3mod.png; http://inspirehep.net/record/1644444/files/fig3ver3mod4.png; http://inspirehep.net/record/1644444/files/arXiv:1712.07608.pdf


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 Запись создана 2018-01-09, последняя модификация 2018-01-09


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