Single Neutron Stripping Reactions for Structural Study of 23 O Ravinder Kumar Department of Physics Kurukshetra University, Kurukshetra Kurukshetra -

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Presentation transcript:

Single Neutron Stripping Reactions for Structural Study of 23 O Ravinder Kumar Department of Physics Kurukshetra University, Kurukshetra Kurukshetra - INDIA

Topic of thesis “To Study the Nuclear Breakup of Unstable Nuclei Lying Close to Drip Line” Goal of study is to analyses 1. Structural 2. Dynamical characteristics of Halo Nuclei

What is Halo Nuclei ? 1. Low Binding Energy ( much less than the stable nuclei) 2. Much Larger R M S Matter Radii 3. Narrow Momentum Distribution 4. Much Higher Breakup Cross Section 5. Long Tail in Density Distribution 1985 Tanihata and His Group

Halo Nuclei 1- n Halo Nuclei 19C 2- n Halo Nuclei 11Li 11Be, 14B, 17C, 19C 22N, 22O, 23O etc. 6He, 11Li, 14Be, 17B 19B, 22C, 27F etc.

Dissociation of Halo Nuclei Nuclear Breakup Coulomb Breakup ( Light nuclei target And low impact parameter ) ( Heavy Nuclei Target ) Stripping or Absorption Diffraction dissociation

Stripping Reaction Target Core Halo Neutron bcbc

Theoretical formalism Eikonal approximation Single Neutron Stripping Cross Section Longitudinal Momentum Distribution of Core fragment

Main ingredient Core target interaction profile function Single neutron target interaction profile function Radial part of relative motion wave function

Profile functions Profile functions S c and S n can have various forms 1.Black Disk 2. Diffuse profile function 3. Realistic profile function (using optical potential) JLM, CH89 etc.

Realistic Profile function Using R L Varner et al systematic Realistic Profile function Using R L Varner et al systematic is the velocity of the projectile Optical potential for n or c Folding model R. L. Varner, W. J. Thompson, T. L. McAbee, E. J. Ludwig, and T. B. Clegg, Phys. Rep. 201 (1991) 57. Neutron target optical potential, Core density

is obtained by Harmonic Oscillator Model The core density parameter is related to by the following expression is adjusted to reproduce the charge radii of core

Relative Motion Wave Function of Core and Halo Neutron of Projectile The range and diffuseness parameters of the potential are tuned locally while the depth is adjusted to reproduced the observed binding energy of the loosely bound nucleon (s). Realistic wave function is obtained by solving Schrodinger wave equation in a Woods Saxon potential

Obtained Partial Cross Section

LMD width corresponding to different s and d states

Mixing of different configuration

The Results of s & d Mix Configurations

Conclusions 1. Neither pure s nor pure d state could reproduce the experimental data. 2. The admixture of s and d configurations with the spectroscopic factors 0.8 and 0.2 have been found to represent the LMD data nicely. 3. For the exact determination of spectroscopic factors multi nucleon theory is required.

Publication in International / National Journals in last two year Publication in International / National Journals in last two year 1. Rajesh Kharab, Ravinder Kumar, Pardeep Singh and H C Sharma, “One neutron stripping reaction of light nuclei”, Parmana-Jour. Phys. Vol.68, No.5, (2007) Rajesh Kharab, Pardeep Singh and Ravinder Kumar, “Effects of E2 and E1-E2 interference on coulomb dissociation of 19C”, Chin. Phys. Lett. Vol. 24, No 03(2007) Rajesh Kharab, Pardeep Singh and Ravinder Kumar, “Influence of finite range of nuclear interaction on coulomb brakup of 11Be”, Ind. Jour. Phys. 81 No. 3, (2007) Rajesh Kharab, Ravinder Kumar, Pardeep Singh and H C Sharma, “Comparison of halo of 11Be, 15C and 19C on light target”, Phys. At. Nucl. (accepted) 5. Rajesh Kharab, Pardeep Singh and Ravinder Kumar, “Effect of E2 transition in the coulomb dissociation of 11Be and 19C”, Ind. Jour. Theo. Phys. (accepted) 6. Rajesh Kharab, Pardeep Singh, Ravinder Kumar and H C Sharma, “Contribution of E2 and E1-E2 interference in the coulomb breakup of 11Be” Int. Jour. Mod. Phys. E (accepted)

7. Rajesh Kharab, Ravinder Kumar, Pardeep Singh and H C Sharma, “Structural analysis of 23O through single neutron stripping reaction”, Com. Theo. Phys. (communicated) 8. Rajesh Kharab, Pardeep Singh and Ravinder Kumar, “Coulomb breakup of neutron rich isotopes of light nuclei”, PINSA,(communicated) 9. Rajesh Kharab, Pardeep Singh, Ravinder Kumar, “Structural analysis of 19C through coulomb dissociation reactions”, J. Phys. G: Nucl. Part. (communicated) 1. Ravinder Kumar, Rajesh Kharab, Pardeep Singh and HC Sharma, “Stripping reaction of neutron rich 11Be and 19C nuclei”, Proc. DAE-BRNS Symp. on Nucl. Phys. Vol. 51(2006) Rajesh Kharab, Pardeep Singh and Ravinder Kumar, “Angular distribution of 10Be in the coulomb breakup of 11Be”, Proc. DAE-BRNS Symp. on Nucl. Phys. Vol. 51(2006)473. PAPER PUBLISHED IN SYMPOSIUM/ CONFERNCE