Invariant mass spectroscopy of 23 O via the (p,p’) reaction in inverse kinematics H He Li Be B C N O F Ne Neutron drip line N=8 N=20 23 O Y.Satou Seoul National University The Fifth Asia-Pacific Conference on Few-Body Problems in Physics 2011 (APFB2011) 22-26 August 2011, Seoul, Republic of Korea 1.Introduction 2.Experiment 3.Results 4.Discussion 5.Summary
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Invariant mass spectroscopy of 23 O via the ( p,p ’) reaction in inverse kinematics
The Fifth Asia-Pacific Conference on Few-Body Problems in Physics 2011 (APFB2011) 22-26 August 2011, Seoul, Republic of Korea. Invariant mass spectroscopy of 23 O via the ( p,p ’) reaction in inverse kinematics. Y.Satou Seoul National University. Ne. Introduction Experiment Results - PowerPoint PPT Presentation
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Invariant mass spectroscopy of 23O via the (p,p’) reaction in
inverse kinematics
HHe
LiBeBC
NO
FNe
Neutron drip line
N=8
N=20
23O
Y.SatouSeoul National University
The Fifth Asia-Pacific Conference on Few-Body Problems in Physics 2011 (APFB2011)22-26 August 2011, Seoul, Republic of Korea
Three-body forces in nucleiT.Otsuka et al., PRL105(2010)032501.
∆ SPE=𝑛 𝑗 ′ ∙∑𝑚 ,𝑚 ′
⟨ 𝑗𝑚 𝑗 ′𝑚′|𝑉| 𝑗𝑚 𝑗 ′𝑚 ′ ⟩ / ∑𝑚 ,𝑚 ′
1
Next step:Three-body force effects on unbound states in neutron rich oxgen isotopes.
1. Introduction
Spectroscopic study of 23O
Ground state configuration of 23O Jπ(gnd.)E.Sauvan et al., PLB491(2000)1. 23O→22O 1/2+
R.Kanungo et al., PRL(2002)142502. 23O→22,21O 5/2+
D.Cortina-Gil et al., PRL93(2004)062501.
23O→22O+ 1/2+
Spectroscopic studies of excited states of 23O Ex (MeV)M.Stanoiu et al., PRC69(2004)034312. 26Ne→23O+ No statesZ.Elekes et al., PRL98(2007)102502. 22O(d,p)22O+n 4.0, 5.3A.Shiller et al., PRL99(2007)112501. 26Ne→22O+n 2.8
This study 23O(p,p’)22O+n ?
Experimental purposes
1. Clarification of the ground state configuration of 23O2. Spectroscopic study of excited states
23O
24O: K.Tshoo, Aug.23 Parallel 4C
Existing studies on excited states in 23O
Z.Elekes et al., PRL98(2007)102502. A.Shiller et al., PRL99(2007)112501.
26Ne→23O+n22O(d,p)22O+n4.0 MeV
5.3 MeVErel=45(2) keV, Ex=2.79(13) MeV
Experimental methodInvariant mass method in inverse kinematics
These features validate use of this method for spectroscopy.
Projectile
Target
θ Erel
Neutron(E1,P1)
Ejectile (E2,P2) Detectors
1. Kinematical focusing of reaction products at forward angles2. Coincidence detection of multi particles3. No need for incident beam momentum4. Drastic gain in Erel resolution
10Be+n at Ei(i=1,2)=50 AMeV, ΔPi/Pi=0.01 => ΔErel=0.1 MeV at Erel=1 MeV