16.07.2013 Views

JAEA-Conf 2011-002 - 日本原子力研究開発機構

JAEA-Conf 2011-002 - 日本原子力研究開発機構

JAEA-Conf 2011-002 - 日本原子力研究開発機構

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

sample changer. The measured flux shape is usually normalized directly to a saturated capture resonance. This<br />

capture yield and its associated statistical uncertainty provided input to the SAMMY data analysis code 13 that<br />

extracted the neutron resonance parameters.<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

<br />

Experiment Overlap<br />

Filter<br />

Epithermal<br />

Capture<br />

Boron<br />

cabide<br />

Neutron-<br />

Producing<br />

Target<br />

Bare<br />

Bounce<br />

<strong>JAEA</strong>-<strong>Conf</strong> <strong>2011</strong>-<strong>002</strong><br />

TABLE II<br />

Gadolinium Experimental Details<br />

Average<br />

Beam<br />

Current<br />

(A)<br />

Beam<br />

Energy<br />

(MeV)<br />

Pulse<br />

Width<br />

(ns)<br />

Channel<br />

Width<br />

(ns)<br />

Pulse<br />

Repetition<br />

Rate<br />

(pulse/s)<br />

Flight<br />

Path<br />

Length<br />

(m)<br />

17.28 57 18 12.8 225 25<br />

Fig. 1. Layout of the RPI LINAC facility.<br />

3. RESULTS AND CONCLUSIONS<br />

Data were dead time corrected, run-summed, beam-monitor-normalized, and background-corrected.<br />

Final processed data were reduced to capture yield. The Resonance parameters, neutron width n, radiation<br />

width , and resonance energy E0, were extracted from the capture using the SAMMY version 8 multilevel Rmatrix<br />

Bayesian code. 7 The resolved resonance energy region for 155 Gd and 157 Gd in the ENDF/B-VII.0<br />

evaluation ends at 180.4 eV and 306.4 eV. As a result, fitting data above 180.4 eV and 306.4 eV were performed<br />

with initial estimates for resonance locations width-a challenging task. 155 Gd and 157 Gd were observed new<br />

resonance as shown in Figure 2. The details of resonance parameters for Gd isotopes are obtained and will be<br />

reported in the separated paper.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!