Çok kısa yarı-ömürlü çekirdek oluşumuna neden olan 14 MeV nötron tepkileşimlerinin incelenmesi
Investigation of 14 MeV neutron induced reactions leading to very short-lived nuclei
- Tez No: 95035
- Danışmanlar: PROF. DR. METİN SUBAŞI
- Tez Türü: Doktora
- Konular: Fizik ve Fizik Mühendisliği, Physics and Physics Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2000
- Dil: Türkçe
- Üniversite: Yıldız Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Fizik Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 86
Özet
ÖZET Bu çalışmada "BOy^Bc,9F(n,p)190, 65Cu(n,a)62mCo ve 65Cu(n,
Özet (Çeviri)
ABSTRACT In this work nB(n,p)HBe, 19F(n,p)190, 65Cu(n,a)62mCo and 65Cu(n,a)62gCo cross-sections were determined between 13.6 - 14.9 MeV neutron energies. The cross-section measurements were performed utilizing the Sames T-400 neutron generator at the Physics Department of Çekmece Nuclear Research and Training Centre, Istanbul. Fast neutrons (-14 MeV) were produced via T(d,n)He reaction in a solid TiT target which was bombarded by 300 keV deuterons. Irradiation was carried out at 6 different angles with respect to the deuteron beam, hence 6 different neutron energies in the range from 13.6 to 14.9 MeV. Since the above mentioned reactions have very short half-lives, a fast sample transfering system enabling a cyclic irradiation and counting has been designed and used as adapted to the accelerator system. The time elapsed during the transference of the sample from the neutron source to the HPGe detector where the gamma measurements are performed is approximately 500 ms. The neutron flux during irradiation was determined with use of the 2 Al(n,p)27Mg standard reaction and flux variation monitored by a plastic scintillator detector and recorded for later evaluation. The effective neutron energy at each irradiation positions was determined by the Zr/Nb activation ratio method. The cross-sections were calculated by means of a computer programme which was written for cyclic activation analyses. In the experimental data, corrections were made for effects of gamma ray attenuation, coincidence summing, puis pileup, dead time, neutron flux fluctuations and scattered (slow) neutrons. The presently measured cross sections are compared with the available data in the literature. Ml
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