Decay Pion Spectroscopy of double- hypernuclei at J-PARC H. - PowerPoint PPT Presentation

Decay Pion Spectroscopy 
 of double- Λ hypernuclei 
 at J-PARC H. Fujioka (Tokyo Tech), 
 T. Fukuda, E. Hiyama, T. Motoba, 
 T. Nagae, S. Nagao, T. Takahashi

� 2 /18 Production of double- Λ hypernuclei 6 ΛΛ He KEK-PS E373 J-PARC E07 10 µ Ξ − + 16 O → ΛΛ Be + 4 He + d 11 10 µ (most probable) ➡ Yoshida-san’s talk #6 #5 A #7 #1 B #2 #3 #4 C Ξ - #8 H. Takahashi et al., Phys. Rev. Lett. 87 , 212502 (2001); 
 J.K. Ahn et al., Phys. Rev. C 88 , 014003 (2013) A variety of double- Λ hypernuclei (5 ≦ A ≦ 17) 
 may be produced by Ξ ｰ capture in light nuclei Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 3 /18 Counter experiments in 2020’s Kaon-induced Production p ̅ -induced 
 The HYP setup at PANDA 7 Li( K − , K + ) 5 ΛΛ H + 2 n Primary target and tracking für pions from weak decay Ξ − production p at J-PARC + Ξ − capture Triple Ge- cluster array Decay Pion Spectroscopy ΛΛ H → 5 5 Λ He + π − P ̅ ANDA at FAIR J. Pochodzalla, HYP2015 Letter of Intent for J-PARC 50 GeV Synchrotron Heavy Ion Collision 5 Decay Pion Spectroscopy of ΛΛ H produced by 7 Li ( K − , K + ) reactions CBM at FAIR 
 Hiroyuki Fujioka 1 ∗ , Tomokazu Fukuda 2 , 4 † , Emiko Hiyama 3 , 4 , Toshio Motoba 2 , 5 , Tomofumi Nagae 6 , Sho Nagao 7 , Toshiyuki Takahashi 8 1 Department of Physics, Tokyo Institute of Technology HIAF (Huizhou, China) 
 2 Osaka Electro-Communication University 3 Department of Physics, Kyushu University HIAF in Huizhou/China 4 RIKEN Nishina Center Hypernuclei program at the CBM 5 Yukawa Instutute for Theoretical Physics, Kyoto University experiment High Intensity Heavy Ion Accelerator Facility 6 Department of Physics, Kyoto University HYP2015, Sendai, Japan 7 Institute for Excellence in Higher Education, Tohoku University Vassiliev Iouri , CBM Collaboration 8 Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization TOF ECAL TRD New Hypernuclear Project Spokesperson: Take Saito @ 2024 http://j-parc.jp/researcher/ 
 RICH June 15, 2018 STS PSD Hadron/en/Proposal_e.html Outline Abstract • CBM physics • Motivation for HYP program Proposed is a novel method to produce a double- Λ hypernucleus without using nuclear emulsion. • CBM tracking and particles ID A Ξ − bound in 6 He and a part of quasi-free Ξ − ’s, produced in 7 Li ( K − , K + ) reactions, are absorbed in • Multi-strange hyperons and 5 ΛΛ H may be formed via Ξ − p → ΛΛ conversion. Decay pion spectroscopy for the reaction point, and Hypernuclei simulation Approved by Chinese government in December 2015 Λ He + π − will be performed after event selection requiring a fast proton from non-mesonic • Conclusion ΛΛ H → 5 5 Under construction 1 Courtesy of Xinwen Ma weak decay of 5 Λ He . The experimental setup will be based on the Ξ -hypernuclear spectroscopy experiment E70; a new cylindrical detector system will be installed between the K1.8 beamline I. Vassiliev, HYP2015 T.R.Saito, HYP2018 spectrometer and the S-2S spectrometer for detection of the decay pion and the proton. Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 4 /18 Decay pion spectroscopy ➡ Nagao-san’s talk on Wednesday Λ H → 4 He + π − 4 at MAMI 4 World data on H from nuclear emulsion Λ Events 40 M. Juri c et al. NP B52 (1973) G. Bohm et al. NP B4 (1968) 20 W. Gajewski et al. NP B1 (1967) 0 4 B ( H) (MeV) 4 2 0 Λ Λ peak maximum = 37 events 35 background at peak = 7.3 events Events / (250 keV/c) 30 25 20 15 A. Esser et al., 
 10 PRL 114 , 232501 (2015) 5 0 A1 Collaboration, 
 105 110 115 120 125 130 135 140 145 150 Pion momentum in SpekC (MeV/c) NPA 954 , 149 (2016) Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

ΛΛ → Ξ − p 5 ΛΛ H � 5 /18 5 ΛΛ - Ξ N mixing in ΛΛ H ●○ ●● ●● 0s 1/2 B.F. Gibson et al., 
 n p Λ Prog. Theor. Phys. Suppl. 117 , 339 (1994) 6 ΛΛ He ●● ●● ●● N 0s 1/2 ~28 MeV ~28 MeV n p Λ H? 3 H+ Ξ − +p Large Mixing ? ~75 MeV ~75 MeV 21MeV Large 3-body force ? ~300 MeV 29MeV mix.~a few % 4 He+ Ξ − 5049.1MeV 5048MeV? 5 Ξ − H N 3 H+ ΛΛ 5040.3MeV ~11MeV? 5 S=0 S=-1 S=-2 ΛΛ H 5037MeV? Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

6 � /18 Production via Ξ -hypernuclear decay PHYSICAL REVIEW C VOLUME 54, NUMBER 1 JULY 1996 Double- L hypernuclear formation via a neutron-rich J state Izumi Kumagai-Fuse and Yoshinori Akaishi Institute for Nuclear Study, University of Tokyo, Tanashi, Tokyo 188, Japan ~ Received 21 March 1996 ! 7 H are discussed as a typical example of the double- L hypernuclear formation via Conversion processes for J 5 H is formed with a surprisingly large branching ratio of about 90% from J 7 H that is a neutron-rich J state. LL 7 H state has a narrow width, 0.75 MeV, and its produced by the ( K 2 , K 1 ) reaction on the 7 Li target. The J population can be confirmed by tagging K 1 momentum. @ S0556-2813 ~ 96 ! 50507-8 # PACS number ~ s ! : 21.80. 1 a. 21.45. 1 v. 25.80.Nv, 25.80.Pw I. Kumagai-Fuse, Y. Akaishi, Phys. Rev. C 54 , R24 (1996) “Selective” production! ◆ Only 4 decay channels are 7 H → LL 5 H 1 n 1 n ; 11 MeV, allowed energetically J 4 H 1 L 1 n 1 n ; 7 MeV, ◆ Among them, the channel → L 4 H * 1 L 1 n 1 n ; 6 MeV, with the fewest bodies and → L the largest Q-value is most → 3 H 1 L 1 L 1 n 1 n ; 5 MeV. predominant (B.R. ~ 90% !!) Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

7 � /18 A new experiment at J-PARC 7 7 Li( K − , K + ) 1. Production of by the reaction 
 Ξ − H 7 Tagging of by means of missing-mass spectroscopy Ξ − H 2. Ξ N → ΛΛ conversion in , yielding 
 7 5 Ξ − H ΛΛ H + 2 n 4 may be produced as well Λ H ΛΛ H → 5 5 Λ He + π − 3. Two-body weak decay of 
 5 4 Identi fj cation of and by detecting π − (>130MeV/ c ) ΛΛ H Λ H Decay pion spectroscopy for 5 ΛΛ H 5 4. Weak decay of Λ He Tagging a fast proton from NMWD of 5 Λ He Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 8 /18 7 Li ( K − , K + ) 7 reaction Ξ − H 7 (a) H (ESC) Ξ − 0 MeV α +n+n+ Ξ – –0.19 –0.57 –0.96 6 He+ Ξ – 5 H α Ξ – ( ) cal +n+n Ξ –1.29 –1.71 –1.83 1/2 + –3.06 (i) k F =0.9 (ii) k F =1.055 (iii) k F =1.3 7 (b) H (ND) Ξ − 0 MeV Fig. 1 Calculated 7 Li ( K − , K + ) inclusive spectra for p K − = 1 . 65 GeV/c and θ K + = 0 ◦ . The left and right panel show the results α +n+n+ Ξ – corresponding to the case using potential ND and ESC with three k f parameters listed in Table 1, respectively. These spectra are 5 H smeared assuming 2 MeV detector resolution α Ξ – ( ) cal +n+n –0.15 Ξ –0.32 Koike and Hiyama, Few-Body Syst. 54 , 1275 (2013) –0.57 6 He+ Ξ – –0.96 –1.50 –2.02 1/2 + –2.52 E. Hiyama et al., Phys. Rev. C 78 , 054316 (2008) Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 9 /18 Momentum of two-body-decay pions Region of Interest Y. Yamamoto, M. Wakai, T. Motoba and T. Fukuda, Nucl. Phys. A 625 , 107 (1997) Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 10 /18 Past counter experiment in BNL-AGS BNL-AGS E906 Ξ N rescattering 
 & Ξ N- ΛΛ conversion 3 Λ H 9 Be( K − , K + ){ Ξ − + 8 Li * } ⟶ [ ΛΛ He * ] + n 8 ⟶ [ 160 P H (MeV/c) ΛΛ H * ] + p 8 25 25 150 20 20 15 15 140 “double- Λ compound nucleus” 4 10 10 Λ H IV → fragmented into double- Λ hypernuclei, 
 130 single- Λ hypernuclei etc. 120 25 25 II 110 4 20 20 ΛΛ H ? Y. Yamamoto, M. Wakai, T. Motoba, T. Fukuda, 
 15 15 100 Nucl. Phys. A 625, 107 (1997) 10 10 I III 90 80 80 90 100 110 120 130 140 150 160 P L (MeV/c) J.K. Ahn et al., Phys. Rev. Lett. 87 , 132504 (2001) Hiroyuki Fujioka (Tokyo Tech.) / QNP2018

� 11 /18 Two-pion coincidence measurement October 17, 2003 14 ΛΛ H and limits on ∆ B ΛΛ Suggested decay mode of 4 160 P H (MeV/c) 25 25 150 ΛΛ H (single Λ binds to 2 H by 0.13 MeV) 20 20 4 15 15 140 π − (104 MeV/c) Decay pion spectroscopy 10 10 IV 130 4 Λ He* p } ? MeV 3 Λ H 120 3 Λ H + p 25 25 (7.75 MeV) II π − (114.3 MeV/c) 110 4 Identi fj cation of 3 20 20 ΛΛ H ? Λ H 4 Λ He 15 15 100 Λ He excitation(MeV) ∆ B ΛΛ (MeV) 4 3 He 10 10 7.75 1.8 I III 90 8.75 0.8 9.84 -0.26 80 80 90 100 110 120 130 140 150 160 P L (MeV/c) HYP2003 P. Pile, HYP2003 Hiroyuki Fujioka (Tokyo Tech.) / QNP2018