TAILIEUCHUNG - Study of the natSm(γ,xn) 143m,gSm reactions induced by bremsstrahlung with end point energies just above gdr region

In order to improve the accuracy of the experimental results the necessary corrections were made. The present results are compared with similar literature data of the natSm(γ,xn)143m,gSm reactions measured at various photon energies and of the natSm(n,2n)143m,gSm reaction induced by 14 MeV neutrons in order to examine the effects of an excitation energy and an input angular momentum. | Communications in Physics, Vol. 24, No. 3S2 (2014), pp. 38-44 DOI: STUDY OF THE nat Sm(γ, xn)143m,g Sm REACTIONS INDUCED BY BREMSSTRAHLUNG WITH END-POINT ENERGIES JUST ABOVE GDR REGION PHAM DUC KHUE AND NGUYEN VAN DO Institute of Physics, Vietnamese Academy of Science and Technology E-mail: pdkhue@ Received 04 April 2014 Accepted for publication 24 May 2014 Abstract. We investigate the energy dependence of the isomeric yield ratios for the nat Sm(γ, xn)143m,g Sm reactions with bremsstrahlung energies of 40-, 45-, and 50-MeV, just above the giant dipole resonance (GDR) region by the off-line γ-ray spectrometric method. The bremsstrahlung photons were produced from the 100 MeV electron linear accelerator (linac) at the Pohang accelerator laboratory (PAL), Pohang, Korea. In order to improve the accuracy of the experimental results the necessary corrections were made. The present results are compared with similar literature data of the nat Sm(γ,xn)143m,g Sm reactions measured at various photon energies and of the nat Sm(n,2n)143m,g Sm reaction induced by 14 MeV neutrons in order to examine the effects of an excitation energy and an input angular momentum. Keywords: Isomeric yield ratio; Photonuclear reaction; bremsstrahlung; HPGe detector nat Sm(γ,xn)143m,g Sm; GDR region; 40-, 45-, and 50-MeV I. INTRODUCTION The isomeric cross section ratio is defined as the ratio of production cross-section for the socalled metalstable or isomeric-state (σm ) to ground-state σg ) ., σm /σg . The relative population of both ground and isomeric states is governed by many factors such as type and energy of incoming projectile, spin distribution of the compound nucleus, the number and type of nuclear particles ejected that carry away energy and angular momentum,. . . Studies of isomeric cross-section ratios may provide important information about the nuclear structure and nuclear reaction mechanism. Most of the existing isomeric ratio

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