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 transcript:

Data Analysis for 23 Al Experiment Kun Wang

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

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

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

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 F2 target  P.I. Method: B  -TOF-  E (before target), TOF-  E-E (after target) 20-4

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

23 Al Reaction cross sections 20-6

Particle Identification after target: Z 20-7

Particle identification after target: A 20-8

Transmission: target-in 20-9

Transmission: target-out 20-10

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

23 Al Parallel momentum distributions 20-12

Particle Identification after target: Z 20-13

Particle Identification after target: A 20-14

Tof23 correction tof23=tof23-f*F1ppac_x tof23=tof23-f*(a*F1ppac_x+b*F2ppacb_x) ( a 2 +b 2 =1 ) f= a=

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

Gate dependence Gate width at F3 Transmission 20-17

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 Al J  =5/2 + (new results by T RIPS 2005) Preliminary

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

Thanks! 20-20