|
US Nuclear Data Program Meeting 2000 Held at E.O. Lawrence Berkeley National Laboratory April 27-28, 2000 |
To NNDC
|
|---|
|
US Nuclear Data Program Meeting 2000 Held at E.O. Lawrence Berkeley National Laboratory April 27-28, 2000 |
To NNDC
|
|---|
| Contributions | ||
| Nuclear Structure & Decay |
Nuclear Reaction | Data Dissemination |
|---|---|---|
| Center Reports | ||
| Brookhaven | Argonne | Brookhaven |
| Idaho Falls | Brookhaven | Lawrence Berkeley |
| Lawrence Berkeley | Los Alamos (Group T-16) | Los Alamos (Group T-16) |
| Oak Ridge | Los Alamos (LANSCE) | Oak Ridge | McMaster | NIST | TUNL |
| TUNL | Oak Ridge | |
| TUNL | Other Status Reports | |
| ENSDF Checking Codes (NNDC) | ||
| Format Proposals & Other Submissions | ||
| ENSDF Formats - Final Level (BNL) | ||
| ENSDF Formats - History Record (BNL) | ||
Abstract: A compilation of information from the literature on the
reaction was completed and presented in an ANL report. An investigation
was conducted concerning an appropriate method for representing large
errors in astrophysical reaction rates. It was concluded that the proper
statistics was the log-normal distribution. Data acquired at JAERI on
238U photo-fission by 6+-MeV gamma rays from the 16N
were analyzed and a journal paper was prepared and accepted for
publication. A paper reporting on the examination of hydrogen-producing
reaction cross sections for vanadium was published. Work on the production
of radioactive 7Be from neutron-induced sequential
charged-particle reactions on lithium was reported at a conference on
materials for nuclear fusion. An experimental investigation of 6+-MeV
gamma-ray production via the
reaction from thick
CaF2 and MgF2 targets was completed and a paper
reporting on the yield and angular distribution results has been accepted
for publication. Use of these gamma rays for the detection of sensitive
nuclear weapons materials has been investigated. Preliminary results from
this work are promising. Measurements of neutron activation cross sections
from 16-20 MeV for several new materials were completed at IRMM. A journal
article that reports on earlier measurements in this project was published.
Finally, a nuclear model parameter sensitivity study has been initiated.
Results have been obtained for Cr and V and a paper reporting on this work
is in preparation.
Full text: PostScript,
Portable Document Format.
Abstract:
This report reviews the activities of the National Nuclear Data Center
(NNDC) for the period April 1999 through March 2000, for the third meeting
of the U.S. Nuclear Data Program (USNDP), April 27-28, 2000. The activities
of the Center in this period include the compilation and evaluation of
nuclear structure and decay data; compilation of nuclear reaction data;
maintenance of bibliographic databases in the areas of nuclear physics;
support of various national and international groups concerned with the
collection, evaluation, and dissemination of nuclear data; dissemination of
the data resident in the NNDC's databases via the Internet and other means;
and serving as the U.S. repository of low- and medium-energy nuclear data.
The name of the person with lead responsibility for the activities described
in each of the sections is underlined.
Full text: PostScript,
Portable Document Format.
Abstract:
The evaluations for A=161 and 163, the latter done at McMaster
University, as well as 161Yb have been completed and entered
into ENSDF, and the evaluation for A=161 is well underway. The data for
eleven radionuclides have been evaluated and published for the Decay Data
Evaluation Project. Network coordination activities have been carried out,
and we have participated in the subcommittees formed at the last
international Network meeting.
Full text: PostScript,
Portable Document Format.
Abstract: The Isotopes Project takes responsibility for the
evaluation of more than 500 nuclides with mass number A from 59 to 293.
Since the April 1999 USNDP Meeting, the Isotopes Project has submitted
revised evaluations for 5 mass chains (about 53 nuclides) and for 8
individual nuclides, and datasets for the newly-reported Z=118 alpha-decay
chain. ENSDF coding of A=21-39 from Endt's 1998 update evaluation is under
way, and the relevant files for A=21-26 have already been completed and
added to ENSDF. The Isotopes Project continues to participate in two
international collaborations for data evaluation: the Decay Data
Evaluation Project (DDEP), which evaluates data for nuclides of interest
in applied research, and an IAEA Coordinated Research Programme (CRP)
for the development of a database providing evaluated data from
reactions. Also, several compiled high-spin data sets were
submitted for inclusion in the XUNDL database.
Full text: PostScript,
Portable Document Format.
Abstract: The Isotopes Project collaborates with Lund University
(Sweden) and Evitech (Finland) to develop Isotope Explorer 2 (C++,
Windows), Isotope Explorer 3 (Java, HTML), and the WWW Table of
Radioactive Isotopes. The group also supports WWW dissemination home
pages for Nuclear Astrophysics,
Neutron Capture, Spontaneous Fission, Radioactive Decay, Nuclear
Structure, Atomic Masses, Education,
and other topics. The demand for these services has approximately
doubled each year. In 1999 the
Isotopes Project server received nearly 2 million requests. There are
over 3200 registered users of Isotope Explorer 2 who downloaded ENSDF
data for almost 400,000 isotopes in 1999. Nearly 200,000 decay data
searches were performed with the WWW Table of Radioactive Isotopes, and
45,000 reference searches
were requested. Home pages for nuclear astrophysics, atomic masses,
nuclear structure, neutron capture,
fission, and education continue to generate strong interest.
Full text: PostScript,
Portable Document Format.
Abstract: The data evaluation work either completed or in progress
since the last US NDP meeting in 1999 is described in the
McMaster status report. One highlight of the project is
the first NDS style publication of A=44 and recent submission
of A=43 for publication.
Full text: PostScript,
Portable Document Format.
Abstract: Neutron total cross sections have been measured from 5 to
560 MeV on 31 elements and isotopes. For nearly all of the target
materials, the data are accurate to better than 1% (both statistical and
systematic) in 1% neutron energy bins. Neutron-induced photon production
cross section measurements for oxygen have been completed from 4 to 200
MeV. Gamma-ray production cross sections on 235U,
238U and 239Pu are in progress to with the goal of deducing
(n,xn) (x=1,2,3-5) reaction cross sections. Fission-fragment yields are
also being determined from these data. A new array, FIGARO, of high
resolution gamma-ray detectors has been commissioned to study
angular-momentum effects in nuclear reactions; data for discrete
transitions following (n,xn), (n,xp) and
Full text: PostScript,
Portable Document Format.
Abstract: Evaluations for A=5, 6, and 7 have been completed, and
preliminary versions are being reviewed in preparation for publication later
this year in Nuclear Physics A of "Energy Levels of Light Nuclei,
The program on preequilibrium reaction
phenomenology has checked and refined the work on surface and
collective effects reported last year. Excitation of giant
resonance (GR) states has also been added to the calculations. The
resulting revised model/code has been verified against the full
project data base, and this work has been submitted for publication.
Full text: PostScript,
Portable Document Format.
Abstract: The current status of the ENSDF Analysis and Utility Codes
is summarized and future plans discussed.
Full Text: HTML.
Abstract: This proposal was submitted to the 1999 USNDP meeting but
was not discussed or adopted. Therefore, it is being resubmitted.
Full Text: HTML.
Abstract: This proposal was submitted to and discussed at the 1999
USNDP meeting but was not adopted. Therefore, it is being resubmitted.
Full Text: HTML.