Diapositive 1

Diapositive 1

Structure at and beyond the dripline below the oxygen anomaly Motivation: shell structure Z=5-8, N~14-16 Inclusive momentum distributions Invariant mass spectroscopy: 19C*, 21C Search for 24,25N Conclusions & Perspectives [ 20B, 22C(2+) ] GROUPE STRUCTURE NUCLAIRE: S LEBLOND, Q DESHAYES, FM MARQUS, J GIBELIN,

NAO, ET AL. J HWANG, Y SATOU (SNU), N KOBAYASHI ET AL.(TOKYOTECH) & THE SAMURAI COLLABORATION STRUCTURE IN THE REGION OF N~14 16 (n 2s1d) n1d5/2 ..n2s1/2 .. N=14 16 n1d3/2 20

Z=8: STRUCTURE IN THE REGION OF N~14 16 (n 2s1d) N=14 16 WBT Shell Model Interaction: M Stanoiu et al., PRC (2008) STRUCTURE IN THE REGION OF N ~ 16 - 20 N=14 16 Z=8

ESPE O isotopes - Otsuka et al., PRL (2010) O: 25 STRUCTURE IN THE REGION OF N~16-20 N=14 16 SAMURAI Collaboration: Y Kondo et al., PRL (2016) O: 26

STRUCTURE IN THE REGION OF N~16-20 N=14 16 SAMURAI Collaboration: Y Kondo et al., PRL (2016) Z=6: STRUCTURE IN THE REGION OF N~14 16 (n2s1/2 n1d5/2) N=14 16 WBT Shell Model Interaction: M Stanoiu et al., PRC (2008)

C: INCLUSIVE CORE MOMENTUM DISTRIBUTION @ 240 MeV/nucleon 19 C(19C,18C) INCLUSIVE Measurement (ZDS): N Kobayashi et al., PRC (2012) C: INCLUSIVE CORE MOMENTUM DISTRIBUTION @ 240 MeV/nucleon 20 C(20C,19C) ln=0 INCLUSIVE Measurement (ZDS): N Kobayashi et al., PRC (2012)

C: INCLUSIVE CORE MOMENTUM DISTRIBUTIONS @ 240 MeV/nucleon 22 C(22C,20C) ln=0 ln=2 INCLUSIVE Measurement (BigRIPS+ZDS): N Kobayashi et al., PRC (2012) SPECTROSCOPY OF UNBOUND SYSTEMS: HIGH-ENERGY DIRECT REACTIONS EXAMPLE: Neutron removal * halo hole states core n nlj2 core n nlj p(core+n) distribution ln halo

* ~10% of observed yield via 3-body continuum: eg., (22C,22C* 20C+n+n) 21 C SPECTROSCOPY OF UNBOUND SYSTEMS: HIGH-ENERGY DIRECT REACTIONS EXAMPLE: Neutron removal * halo hole states core n nlj2 core n nlj p(core+n) distribution ln halo Proton removal projectile valence n nlj unperturbed [ Dln 0 ]

* ~10% of observed yield via 3-body continuum: eg., (22C,22C* 20C+n+n) 21 C INVARIANT MASS SPECTROSCOPY BEYOND THE DRIPLINE nucleon knockout or breakup(b 0.6) + in-flight decay fragment n FSI Vf RNB Vf - Vn target

f+n Vn Ed = 1 m (vf - vn)2 2 NOTE: excited state of core also should be included where populated g-ray decay KINEMATICALLY COMPLETE MEASUREMENTS: core + g + n @ ~240 MeV/nucleon C*: C(20C,18C+n)

19 @ 280 MeV/nucleon SAMURAI Collaboration: J Hwang et al., PLB (2017) C: LEVEL SCHEME 19 SAMURAI Collaboration: J Hwang et al., PLB (2017) 21 C: C(22N,20C+n) @ 245 MeV/nucleon

uncorrelated f+n events / non resonant continuum * * generated via event mixing S Leblond et al., NP1106-SAMURAI04 21 C: C(22N,20C+n) @ 245 MeV/nucleon C(22N,20C+n) l=0 1d3/2 2s1/2

1d5/2 1p1/2 1p3/2 n 22 l = 0 (R-Matrix) ER =0.900.10 MeV; G = 0.80 0.50 MeV 1s1/2 N 21C + non resonant continuum S Leblond et al., NP1106-SAMURAI04 21

C: C(22C,20C+n) @ 245 MeV/nucleon non resonant continuum S Leblond et al., NP1106-SAMURAI04 21 C: C(22C,20C+n) @ 245 MeV/nucleon C+n MOMENTUM DISTRIBUTIONS 20

1d3/2 2s1/2 1d5/2 OR 1d3/2 2s1/2 1d5/2 1p1/2 1p3/2 n 22 1s1/2 C 21C

S Leblond et al., NP1106-SAMURAI04 C: C(22C,20C+n) 21 @ 245 MeV/nucleon C(22C,20C+n) Er=0.750.20 MeV Er=1.500.10 MeV C 20 Erel < 0.8 MeV

0.8 < Erel < 1.6 MeV l=0 l=2 Eg (keV) S Leblond et al., NP1106-SAMURAI04 C: C(22C,20C+n) 21 @ 245 MeV/nucleon C(22C,20C+n) Er=0.750.20 MeV

Er=1.500.10 MeV l=0 l=2 ExEx Eikonal + shell model C2S S Leblond et al., NP1106-SAMURAI04 JA Tostevin S Leblond et al., NP1106-SAMURAI04 Z=7: STRUCTURE IN REGION OF N ~ 16 N=14

16 N=14 16 18 20 Binding E wrt AO : N isotopes with SCGF - Cipollone et al., PRC (2015) FIRST OBSERVATION OF 24N: C(26F,23N+n) @ 200 MeV/nucleon C C Jp = 2-,1p(1p1/2)-1 n1d3/2 [25Ogs] N

N N 25 16 PR N=14 EL I M IN

A RY 24 AME2012: Sn (24N) = -0.550.50 MeV ## Q Deshayes (LPC), PhD Thesis in progress FIRST OBSERVATION OF 24N: C(26F,23N+n) @ 200 MeV/nucleon C C Jp = 2-,1p(1p1/2)-1 n1d3/2 [25Ogs] N N

N 25 16 PR N=14 EL I M IN A

RY 24 AME2012: Sn (24N) = -0.550.50 MeV ## Q Deshayes (LPC), PhD Thesis in progress EVIDENCE FOR 25N: C(27F / 28Ne,23N+n+n) @ 200 MeV/nucleon C C Jp = 1/2N N p(1p1/2)-1 (n1d3/2)2 [26Ogs] N

25 16 PR N=14 EL I M IN A RY

24 AME2012: S2n (25N) = -1.520.59 MeV ## Q Deshayes (LPC), PhD Thesis in progress CONCLUSIONS & PERSPECTIVES 19 C : 1/2+ 5/2+ inversion confirmed with 5/2+1 found at threshold (Ex=0.6 MeV)

22 C : valence/halo configurations n (2s1/2)2 + n (1d5/2)2 C : 1/2+ 5/2+ inversion ; 3/2+ located 24 N: observed for first time ~1.4 MeV above 1n threshold 25 N: evidence for structure ~2 MeV above 2n threshold 21 IN PROGRESS Detailed comparison of momentum distributions with theory: C(22C,20C+n) Refining and finalising 23-25N results + 20B

PERSPECTIVES B (N=15, 16) [re] measured SAMURAI36-1 Nov 2016 24,25 N (N=17,18) beamtime approved for re-measurement [with MINOS ? (p,3p)? ] 23 C search to be re-proposed 20,21 CHARGE EXCHANGE TO REACH BEYOND THE NEUTRON DRIPLINE ? PERSPECTIVES: CHARGE-EXCHANGE

C(21N,20C+n) C(22C,20C+n) l=0 l=2

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