The Inverse Kinematics Resonance Elastic
Scattering Reaction of 10,11,12Be+p
Liu Yingdu(刘应都) PHD candidate
Advisor：Wang Hongwei, Ma Yugang
2013.01.10
Shanghai Institute of Applied Physics(SINAP), CAS
Outline
Motivation;
The Experiment Introduction;
Data Analysis and the Preliminary Result;
Motivation
 The study of exotic light nuclei far from the stability is a major issue
in recent nuclear physics experiments, because it can provide us
more important information about the nuclear structure and interaction, increasing our understanding on the behavior of nuclear
matter at the extreme neutron to proton ratios.
 The interesting nuclei 10Be,11Be and 12Be resonance elastic
scattering reaction
The energy structure
and width of 11B
determination still exists
debate;

H.T.Fortune, Phys. Rev. C 74,034328 (2006);
F.C.Barker, Phys. Rev. C 76,027602 (2007);
Taken from :http://www.tunl.duke.edu/nucldata
Measurement of Excitation function 10Be+p→11B(11Be)
Simulation by R-matrix
depends on these data
 No experimental result has been
reported in 10Be+p resonance elastic
scattering reaction
 Energy level data come from TUNL
and capture reaction
Measurement of Excitation function 11Be+p→12B(12Be)
 Only two energy levels exist above 14MeV,
and their spin-parities are still not clear
According to R-Matrix calculation，for first resonance state，if its spin-parity is
2+（excited state energy is 14.82MeV），the orbit angular momentum number is L=2，
the single particle energy level width is 5.7keV，the calculated resonant state is a very
sharp peak, and second will be flat peak at L=0，J=0+.
Until now , No resonance elastic scattering data have been reported.
Measurement of Excitation function 12Be+p→13B(13Be)
13Be is an unbound
neutron emitter,
theoretical predict
it has a very low S
wave（Jπ=1/2+） or
P wave（Jπ=1/2-）
ground state.
But untill now, its
energy level ,spinparity are not
confirmed in
experiment.
Experimental Method
 Thick Target Inverse Kinematics
Method (TTIK) is a powfull tool
for studying unstable neutronriched nulei
 (developed by K.P.Artemov et al. in
1990,Sov.J.Nucl.Phys.52,480(1990) )
Ecm
A 1

Ep
2
4 A cos  lab
Heavy Ion Beam
E x  Ecm  Q
The 10Be(p,10Be)p is an inverse kinematical resonant elastical reaction
using the TTIK method!!!
Experiment Introduction
Parameters of RIBLL1
Wedge Al
3060um
Homogeneous
C1 -Slit
 10 mm
HIRFL 18O8+
59.62MeV/u，
200enA
10,11Be
TOF start
C9H10 50um
Target Be
4616um
 2012 RIBLL1 10Be+p main parameters ：





主束能量：18o, 59.62MeV/u
初级靶
降能片
次级束
次级靶
：9Be, 4616um；
：Al, 3060um ；
: 10Be,~7.2MeV/u；
: CH2, 41.85mg/cm2
C2- Slit
 15 mm
7.2MeV/u
Experiment Introduction
Setup of Experiment 10Be+p
Some pictures
Beam
Position Sensitive silicon detector→ position calibration
PPAC calibration
Data Analysis
10Be
Beam Tunning
 Include :
1）PID befor target
2）PID after target
3）Subtract of Carbon background
4）Energy loss correction in PE target
Figure1: ∆E-ToF scattering plot
Figure2: PID of experiment and TOF cut，10Be purity ~92%
 Include :
12Be
1）PID befor target
2）PID after target
3）Subtract of Carbon bkg
4）Energy loss correction in PE target
 No enough time for 12Be in
this beam time.
15C
14C
 Can't be selected by simple
TOF cut, thin silicon ΔE detector
must be used.
14B
13B
12B
11B
12Be
6Li
11Li
11Be
9Li
10Be
7Li
4He
Beam Tunning
8Li
6He
8He
 At the same time, big
Accelerator question, Beam
Stop. Silicon detector Dead.
Give up
Test Result: 100 Count/s for
12Be beam, purity about 60%.
 Include :
Data Analysis of
10Be
1）PID befor target
2）PID after target
3）Subtract of Carbon bkg
4）Energy loss correction in PE target
Compare with GEANT4 Simulation.
Red Point:
Geant4；
Brown point: Experimental data
.
Compare with Lise++ calculation
Red point:
Lise++；
Brown point: experimental data
 Include :
1）PID befor target
2）PID after target
3）Subtract of Carbon bkg
4）Energy loss correction in PE target
Data Analysis
protons come from：
(a) 10Be + H
(b) 10Be + C and other material around
(c) other particles + C and material around
deduction method：10Be+C exp. ; deducted
per energy bin.
Np 
N ch 2 _ beam
N c _ beam
n
 ch 2
nc
the relationship
of energy bins
and mass thickness
Carbon Background
spectrum
 Include :
Data Analysis
-Underconstruction
proton energy loss in
PE target correction
1）PID befor target
2）PID after target
3）Subtract of Carbon bkg
4）Energy loss correction in PE target
Figure: ∆Ep-Ep relationship
(not the final result )
Data Analysis
Ene Loss cal：
Gean4 & Lise++、
difference < 5%
Data Analysis---Scattering angle
1. Beam direction were determined by
the PPACs
1

mm  0.28 mm
12
2. Recoil protons direction was determined by
the Position Sensitive Silicon Detectors '

3.125
mm  0.9mm
12


 sca
 sca  arccos(
v beam  v sca


| vbeam |  | vsca |
)
Data Analysis-Ecm
Preliminary result
Ecm 
M 10Be  M H
4M 10Be cos 2  sca
Ep
More work need to do....
Thank you!
请多指教!!