Measurement of the lifetime and of weak decay partial widths of mirror p-shell Λ-hypernuclei
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1 Measurement of the lifetime and of weak decay partial widths of mirror p-shell -hypernuclei International Workshop on Physics at the extended Hadron Experimental Facility of J-PARC March 5-6, 2016, J-PARC, Tokai, Japan Alessandro Feliciello I.N.F.N. - Sezione di Torino
2 Physics motivations further studies of p-shell -hypernuclei (in particular of the neutron-rich ones, e.g. B ) determination of: tot /τ - 0 (possibly) p
3 The cultural heritage: and 0 - / world average 0 / world average strong nuclear structure effects E. Botta, T. Bressani, S. Bufalino, A. Feliciello, Riv. N. Cim. 38 (2015) 387. K. Itonaga, T. Motoba, Progr. Theor. Phys. Suppl. 185 (2010) 252. A. Gal, NPA 828 (2009) 72.
4 First determination of p / for 8 Hypernuclei p / world average E. Botta, T. Bressani, S. Bufalino, A. Feliciello, Riv. N. Cim. 38 (2015) 387. K. Itonaga, T. Motoba, Progr. Theor. Phys. Suppl. 185 (2010) 252.
5 Completion of decay pattern for 5 He and 11 B 10 T / / 0 / p / 2N / / n n / p 5 He 11 B 0.962± ± ± ± ± ± ± ± ± ± ± ± ± ± ±0.37 C 0.0± ± ±0.088 n / p K. Itonaga, T. Motoba, PTP 185 (2010) ± ± ±0.27 C 1.241± ± ± ± ± ± ± N / p = 0.36 ± stat 0.04sys
6 Charge dependence effects ( B) / ( T. Motoba, NPA 547 (1992) 115c. K. Itonaga, T. Motoba, Prog. Theor. Phys. Suppl. 185 (2010) 252. C) =? 3 = ( ( C) / C) ( ( B) T. Motoba, NPA 547 (1992) 115c. 0 B) =? 8
7 The rationale to perform new measurement by exploiting to a large extent preexisting facilities and infrastructures to strength the international collaboration and the synergy with the J-PARC experimental Groups
8 A. Feliciello / International Workshop on Physics at the extended Hadron Experimental Facility of J-PARC, J-PARC, Tokai, Japan, March 5-6, Extended Hadron Hall courtesy of T. Takahashi
9 Features and physics scopes: K1.1 kaon (~1.1GeV/c) and pion (- ~1.2GeV/c) beams 1.9 m-long separators x 2 28 m length 300k K - (1.1) /spill and K/p ~1:1 with 5e+13 ppp good resolution spectrometers: Beam and SKS studies on -hypernuclei and ΣN interaction γ-ray spectroscopy by the (K -, - γ) reaction weak decays: ( +,K + ) / ( -, K 0 ) ΣN scattering: (K -, ± ), ( ±,K + ) courtesy of T. Takahashi
10 17 A possible apparatus concept layout K 0 spectrometer + C K 0 0 K S + + B SKS spectrometer
11 Concept design
12 Concept design detector performance: solid angle coverage 50-60% range detector final goal: SKS -hypernucleus MM resolution 3 MeV (FWHM) drift chambers energy resolution on - 2 MeV (FWHM) spatial resolution 300 µm angular resolution 100 mrad
13 Concept design C target thickness: 0.7 gr/cm 2 along the beam: 1.0 gr/cm 2 possible alternatives: 6 Li 7 Li 9 Be 16 O theoretical advice required
14 Kinematics S K S a c c e p t a n c e + (from K 0 decay) to SKS + C K 0 + B - (from K 0 decay) to range detector - beam 0 (from YN decay) to Pb converter - or p (from YN decay) to range detector
15 Expected rates (preliminary estimate) beam request: target thickness angular acceptance K 0 K 0 s, K 0 s + - BRs ε det, ε rec phase space factor delivered B 0 dσ 10 dω events events events p µb sr H. Hotchi et al., PRC 64 (2001) events precise measurements τ ( B ) 23
16 25 A. Feliciello / International Workshop on Physics at the extended Hadron Experimental Facility of J-PARC, J-PARC, Tokai, Japan, March 5-6, Thank you!
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