Spectroscopy of A=9 hyperlithium with the $$(e,e^{\prime}K^{+})$$ reaction

Journal Article · Mon Apr 05 00:00:00 EDT 2021 · Physical Review C

DOI:https://doi.org/10.1103/physrevc.103.l041301· OSTI ID:1774784

Gogami, T.; Chen, C.; Kawama, D.; Achenbach, P.; Ahmidouch, A.; Albayrak, I.; Androic, D.; Asaturyan, A.; Asaturyan, R.; Ates, O.; Baturin, P.; Badui, R.; Boeglin, W.; Bono, J.; Brash, E.; Carter, P.; Chiba, A.; Christy, E.; Danagoulian, S.; De Leo, R. ; Doi, D.; Elaasar, M.; Ent, R.; Fujii, Y.; Fujita, M.; Furic, M.; Gabrielyan, M.; Gan, L.; Garibaldi, F.; Gaskell, D.; Gasparian, A.; Han, Y.; Hashimoto, O.; Horn, T.; Hu, B.; Hungerford, Ed. V.; Jones, M.; Kanda, H.; Kaneta, M.; Kato, S.; Kawai, M.; Khanal, H.; Kohl, M.; Liyanage, A.; Luo, W.; Maeda, K.; Margaryan, A.; Markowitz, P.; Maruta, T.; Matsumura, A.; Maxwell, V.; Meekins, D.; Mkrtchyan, A.; Mkrtchyan, H.; Nagao, S.; Nakamura, S. N.; Narayan, A.; Neville, C.; Niculescu, G.; Niculescu, M. I.; Nunez, A.; Nuruzzaman,; Okayasu, Y.; Petkovic, T.; Pochodzalla, J.; Qiu, X.; Reinhold, J.; Rodriguez, V. M.; Samanta, C.; Sawatzky, B.; Seva, T.; Shichijo, A.; Tadevosyan, V.; Tang, L.; Taniya, N.; Tsukada, K.; Veilleux, M.; Vulcan, W.; Wesselmann, F. R.; Wood, S. A.; Yamamoto, T.; Ya, L.; Ye, Z.; Yokota, K.; Yuan, L.; Zhamkochyan, S.; Zhu, L.

Missing mass spectroscopy with the $$(e,e^{\prime}K^{+})$$ reaction was performed at JLab Hall C for the neutron rich $$\Lambda$$ hypernucleus $$^{9}_{\Lambda}{\rm Li}$$. The ground state energy was obtained to be $$B_{\Lambda}^{\rm g.s.}=8.84\pm0.17^{\rm stat.}\pm0.15^{\rm sys.}~{\rm MeV}$$ by using shell model calculations of a cross section ratio and an energy separation of the spin doublet states ($$3/2^{+}_1$$ and $$5/2^{+}_1$$). In addition, peaks that are considered to be states of [$$^{8}{\rm Li}(3^{+})\otimes s_{\Lambda}=3/2^{+}_{2}, 1/2^{+}$$] and [$$^{8}{\rm Li}(1^{+})\otimes s_{\Lambda}=5/2^{+}_{2}, 7/2^{+}$$] were observed at $$E_{\Lambda}(\#2)=1.74\pm0.27^{\rm stat.}\pm0.11^{\rm sys.}~{\rm MeV}$$ and $$E_{\Lambda}(\#3)=3.30\pm0.24^{\rm stat.}\pm0.11^{\rm sys.}~{\rm MeV}$$, respectively. The $$E_{\Lambda}(\#3)$$ is larger than shell model predictions by a few hundred keV, and the difference would indicate that a $${\rm ^{5}He}+t$$ structure is more developed for the $$3^{+}$$ state than those for the $$2^{+}$$ and $$1^{+}$$ states in a core nucleus $$^{8}{\rm Li}$$ as a cluster model calculation suggests.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• Contributing Organization: HKS (JLab E05-115) Collaboration
• Grant/Contract Number: FG02-97ER41047; AC02-98CH10886; FG02-00ER41110; AC05-84ER40150; AC02-06CH11357; FG02-99ER41065; AC05-06OR23177; 15684005; 16GS0201; 24.4123; 17H01121; 12002001; 18H01219; 21002; JP18H05459; R2201; 0758095; 013815
• OSTI ID: 1774784
• Report Number(s): JLAB-PHY-21-3324; DOE/OR/23177-5162; arXiv:2102.04437; TRN: US2209265
• Journal Information: Physical Review C, Vol. 103, Issue 4; ISSN 2469-9985
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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