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Data Analysis for 23 Al Experiment Kun Wang. Data Analysis for 23 Al Experiment  Background  Experiment  Reaction cross section  P.I.  Transmission.

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Presentation on theme: "Data Analysis for 23 Al Experiment Kun Wang. Data Analysis for 23 Al Experiment  Background  Experiment  Reaction cross section  P.I.  Transmission."— Presentation transcript:

1 Data Analysis for 23 Al Experiment Kun Wang

2 Data Analysis for 23 Al Experiment  Background  Experiment  Reaction cross section  P.I.  Transmission  Results & Gate dependence  Parallel momentum distribution  P.I. for fragments  Results & Gate dependence  Summary 20-1

3 Background:  Measurement of reaction cross section enhanced  R @ ~30A MeV measured on RIBLL  Measurement of longitudinal momentum distribution no experimental measurement 20-2

4 20-3 Apr. 8 ~ Apr. 14, 2004 8 RIKEN

5 Experimental Setup at RIPS  Primary Beam: 135A MeV 28 Si  Machine Time: 6 days (Apr. 8 ~ Apr. 14, 2004)  Secondary Beam: ~70A MeV 23 Al etc @ F2 target  P.I. Method: B  -TOF-  E (before target), TOF-  E-E (after target) 20-4

6 Particle Identification before target Z vs. A/Z 23 Al 22 Mg 25 Si 24 Al 21 Na 20-5

7 23 Al Reaction cross sections 20-6

8 Particle Identification after target: Z 20-7

9 Particle identification after target: A 20-8

10 Transmission: target-in 20-9

11 Transmission: target-out 20-10

12

13

14 Reaction cross section can be obtained by formula below: where t is the thickness of target, N BC counts of projectile nuclei before target, N AC after target, 1 for target-in data and, 2 for target-out data. Transmission Gate width at F3 Gate dependence Transmission dependence 20-11

15 23 Al Parallel momentum distributions 20-12

16 Particle Identification after target: Z 20-13

17 Particle Identification after target: A 20-14

18 Tof23 correction tof23=tof23-f*F1ppac_x tof23=tof23-f*(a*F1ppac_x+b*F2ppacb_x) ( a 2 +b 2 =1 ) f=0.0276 a=0.917 20-15

19 F b = F o * P i / P o P o // folded by a gauss function  P i // P oF // folded by a gauss function  P b // F b /P i = F o / P o 20-16

20 Gate dependence Gate width at F3 Transmission 20-17

21 Summary  23 Al,  R =1618  47, FWHM (P // ) = 233  14 MeV/c  22 Mg,  R =1585  222, FWHM (P // ) = 310  20 MeV/c  21 Na,  R = ?, FWHM (P // ) = 236  32 MeV/c  25 Si,  R =1400  73, FWHM (P // ) = ?  24 Al,  R =1350  60, FWHM (P // ) = 230  10 MeV/c 20-18 23Al J  =5/2 + (new results by T Nagatomo @ RIPS 2005) Preliminary

22 20-19 The reaction cross section of 23Al can be described when the core size is enlarged

23 Thanks! 20-20

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