Self-Assessment Quiz — Chapter 35
Test your understanding of the core concepts before moving on. Try to answer each question before checking the solutions at the end.
Q1. (Multiple Choice) Which journal is the primary home journal of nuclear physics (nuclear structure, reactions, and astrophysics)?
(a) Physical Review Letters (b) Physical Review C (c) Nuclear Physics A (d) Physics Letters B
Q2. (Multiple Choice) What is the recommended first step when reading a nuclear physics paper for the first time?
(a) Read the abstract carefully (b) Read the introduction (c) Look at the figures and read the summary/conclusions (d) Read the methods section
Q3. (True/False) In nuclear physics, journal impact factors are the most reliable indicator of the quality of individual papers.
Q4. (Short Answer) What are the two components of uncertainty in a nuclear physics measurement? Which one can be reduced by collecting more data?
Q5. (Multiple Choice) A reduced chi-squared of $\chi^2_\nu = 0.25$ indicates:
(a) An excellent fit — the model perfectly describes the data (b) The error bars may be overestimated (c) The error bars are underestimated (d) The model has too few free parameters
Q6. (Multiple Choice) In nuclear physics, the threshold for claiming "discovery" of a new phenomenon is:
(a) $2\sigma$ (95% confidence) (b) $3\sigma$ (99.7% confidence) (c) $5\sigma$ (99.99994% confidence) (d) $10\sigma$
Q7. (True/False) A result reported as $E = 1234.5(3)(7)$ keV has a statistical uncertainty of 0.3 keV and a systematic uncertainty of 0.7 keV.
Q8. (Short Answer) What is arXiv? Are papers on arXiv peer-reviewed?
Q9. (Multiple Choice) Which arXiv category contains experimental nuclear physics papers?
(a) hep-ex (b) nucl-ex (c) astro-ph.HE (d) physics.atom-ph
Q10. (Multiple Choice) Which nuclear data resource provides the most comprehensive compilation of evaluated nuclear structure data (level energies, spin-parities, transition rates)?
(a) ENDF (b) ENSDF (c) TENDL (d) AME
Q11. (Short Answer) What is the difference between ENSDF and XUNDL? When would you consult XUNDL instead of ENSDF?
Q12. (Multiple Choice) The Atomic Mass Evaluation (AME) provides:
(a) Nuclear reaction cross sections (b) Atomic masses, binding energies, and separation energies for all known nuclides (c) Fission product yields (d) Radiation dose conversion factors
Q13. (True/False) TENDL generates cross sections primarily from nuclear reaction model calculations rather than from direct evaluation of experimental data.
Q14. (Short Answer) Name three nuclear physics conferences and briefly describe the scope of each.
Q15. (Multiple Choice) Conference proceedings in nuclear physics are:
(a) As rigorously peer-reviewed as journal articles (b) Lightly reviewed and may contain preliminary results (c) Never cited in journal publications (d) Only published if the work is also submitted to a journal
Q16. (True/False) INSPIRE-HEP is a literature database specifically designed for nuclear and particle physics, providing citation tracking and author profiles.
Q17. (Short Answer) What is the recommended "daily" activity for staying current in nuclear physics? Approximately how much time does it take?
Q18. (Multiple Choice) The American Board of Radiology (ABR) certifies professionals in which nuclear-physics-related career?
(a) Nuclear engineering (b) Medical physics (c) Health physics (d) Nuclear security
Q19. (Short Answer) Name three DOE Office of Science national laboratories that have significant nuclear physics programs and describe the primary nuclear physics activity at each.
Q20. (Multiple Choice) Which of the following is NOT identified as a major open question in the 2023 NSAC Long Range Plan?
(a) What are the limits of nuclear existence? (b) Is the neutrino its own antiparticle? (c) What is the equation of state of dense nuclear matter? (d) Has the nuclear force been completely determined from first principles?
Solutions
Q1. (b) Physical Review C is the primary home journal of nuclear physics.
Q2. (c) The recommended strategy is to look at the figures first and read the summary/conclusions before reading the abstract or introduction. This provides a framework for understanding the rest of the paper.
Q3. False. In nuclear physics, impact factors are less useful than citation counts and the substance of the results. PRC has a modest impact factor (~3.1) but publishes the foundational work of the field.
Q4. The two components are statistical uncertainty (from the finite number of counts, reducible by collecting more data) and systematic uncertainty (from calibration, efficiency, background subtraction, etc., NOT reducible by more data — requires new techniques or better calibrations).
Q5. (b) A $\chi^2_\nu$ much less than 1 suggests the error bars are overestimated. If the model is correct and the error bars are accurate, $\chi^2_\nu$ should be close to 1.
Q6. (c) The $5\sigma$ threshold is the standard for claiming discovery in nuclear and particle physics.
Q7. True. The convention $E = 1234.5(3)(7)$ keV means the first parenthetical is the statistical uncertainty (0.3 keV) and the second is the systematic uncertainty (0.7 keV).
Q8. arXiv (https://arxiv.org) is a preprint server hosted by Cornell University where researchers post papers before or simultaneously with journal publication. Papers on arXiv are not peer-reviewed.
Q9. (b) nucl-ex is the arXiv category for experimental nuclear physics.
Q10. (b) ENSDF (Evaluated Nuclear Structure Data File) is the most comprehensive compilation of evaluated nuclear structure data.
Q11. ENSDF contains critically evaluated nuclear structure data — the "adopted values" based on all published measurements. XUNDL (Experimental Unevaluated Nuclear Data List) contains recent experimental results that have not yet been incorporated into ENSDF evaluations. Consult XUNDL when you need the most recent measurements, since ENSDF evaluations can lag publications by several years.
Q12. (b) The AME provides atomic masses, binding energies, and separation energies for all known nuclides.
Q13. True. TENDL is generated by the TALYS nuclear reaction code, using model calculations benchmarked against available experimental data. This distinguishes it from ENDF/B, which is based on critical evaluation of experimental data.
Q14. Any three from: DNP (APS Division of Nuclear Physics) — annual, broad nuclear physics, US-centered; INPC (International Nuclear Physics Conference) — triennial, broad nuclear physics, international; NIC (Nuclei in the Cosmos) — biennial, nuclear astrophysics; RIKEN Symposia — annual, exotic nuclei; Zakopane Conference — annual, European nuclear structure; ARIS — triennial, rare isotope science; Quark Matter — annual, heavy-ion/QGP.
Q15. (b) Conference proceedings are lightly reviewed and may contain preliminary results. They should be cited with caution, and journal publications should be preferred when available.
Q16. True. INSPIRE-HEP is maintained by CERN, DESY, Fermilab, IHEP, and SLAC and is the standard literature database for nuclear and particle physics.
Q17. Read the arXiv daily listings for nucl-ex, nucl-th, and astro-ph.HE, scanning titles for relevant papers. This takes approximately 10–15 minutes per day.
Q18. (b) The ABR certifies medical physicists who work in clinical radiation therapy, diagnostic imaging, and nuclear medicine.
Q19. Any three from: ORNL (Oak Ridge) — nuclear structure, isotope production, nuclear security; ANL (Argonne) — ATLAS accelerator, nuclear structure and theory; BNL (Brookhaven) — NNDC, RHIC/EIC, nuclear data; FRIB/MSU — rare isotope science, nuclear structure, nuclear astrophysics; JLab — nucleon structure, 12 GeV CEBAF; LBNL (Berkeley) — nuclear theory, superheavy elements; LANL (Los Alamos) — nuclear data, neutron science.
Q20. (d) While significant progress has been made in understanding the nuclear force from QCD via chiral effective field theory, the Long Range Plan focuses on limits of nuclear existence, neutrino properties, the dense matter EOS, and nucleon internal structure as the major open questions. The nuclear force is a key tool, not an open question in this framing.