https://repository.auw.edu.bd/handle/123456789/725 2026-06-13T10:40:12Z 2026-06-13T10:40:12Z Meaze, AKM Moinul Haque https://repository.auw.edu.bd/handle/123456789/950 2026-02-18T06:14:55Z 2013-01-01T00:00:00Z

Neutron Capture Cross Section of Unstable 63Ni: Implications for Stellar Nucleosynthesis Meaze, AKM Moinul Haque The 63Niðn; Þ cross section has been measured for the first time at the neutron time-of-flight facility n_TOF at CERN from thermal neutron energies up to 200 keV. In total, capture kernels of 12 (new) resonances were determined. Maxwellian averaged cross sections were calculated for thermal energies from kT 1⁄4 5–100 keV with uncertainties around 20%. Stellar model calculations for a 25M star show that the new data have a significant effect on the s-process production of 63Cu, 64Ni, and 64Zn in massive stars, allowing stronger constraints on the Cu yields from explosive nucleosynthesis in the subsequent supernova.

2013-01-01T00:00:00Z Meaze, AKM Moinul Haque https://repository.auw.edu.bd/handle/123456789/949 2026-02-18T06:14:58Z 2005-01-01T00:00:00Z

Measurement of Total Cross Sections at Pohang Neutron Facility Meaze, AKM Moinul Haque The Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a time-of-flight path with an 11 m length has been operated since 2000. We report the status activities on the neutron total cross-section measurements in the neutron energy region from 0.01 eV to 100 eV by the neutron time-of-flight method at Pohang Neutron Facility. A 6 Li-ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.5 cm has been used as a neutron detector. The background level has been determined by using notch- filters of Co, In, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and that from neutron capture, we have employed a neutron-gamma separation system based on their different pulse shape. The present measurements for Ag, Hf, and Ta samples are compared with the previous ones and the evaluated data in ENDF/B-VI. The resonance parameters for Ag and Hf samples have been extracted from the transmission data by using the SAMMY code.

2005-01-01T00:00:00Z Meaze, AKM Moinul Haque https://repository.auw.edu.bd/handle/123456789/948 2026-02-18T06:15:28Z 2006-01-01T00:00:00Z

Measurements of the Neutron Total Cross-Sections of Tantalum by Using Pulsed Neutrons Based on an Electron Linac Meaze, AKM Moinul Haque The neutron total cross-sections of tantalum (181Ta) were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility, which consists of an electron linac, a water-cooled tantalum target with a water moderator, and a 12-m- long time-of-flight path. A 6Li-ZnS(Ag) scintillator with a diameter of 12.5 cm and a thickness of 1.6 cm was used as a neutron detector, and a natural tantalum metal plate, 10 × 10 cm2 in area by 0.45 mm in thickness, was used for the neutron transmission measurement. The background level was determined by using a notch-filter of Co, In, and Cd sheets. The present measurement was compared with the previous ones and the evaluated data in ENDF/B-VI.8. The resonance parameters of 181Ta isotope were obtained from the transmission ratio by using the SAMMY code, which utilizes both Doppler and resolution broadening effects and Bayes’ generalized least squares technique.

2006-01-01T00:00:00Z Meaze, AKM Moinul Haque https://repository.auw.edu.bd/handle/123456789/947 2026-02-18T06:15:26Z 2006-01-01T00:00:00Z

Measurements of neutron and photon distributions by using an activation technique at the pohang neutron facility Meaze, AKM Moinul Haque The Pohang Neutron Facility, which consists of an electron linear accelerator, a water-cooled Ta target with a water moderator, and a time-of-flight path with an 11-m length, was constructed to measure neutron total cross-sections in the neutron energy region from thermal to several hundreds of eV by using the time-of-flight method. In order to utilize this pulsed neutron facility based on an electron linac, we have to understand the characteristics of the radiation fields produced in this facility. We used the multiple-foil activation method to measure the neutron and the photon distributions produced by a water-cooled Ta target with and without the water moderator.

2006-01-01T00:00:00Z