ADVANCED NUCLEAR ASTROPHYSICS - 2021/2
Module code: PHY3059
In light of the Covid-19 pandemic, and in a departure from previous academic years and previously published information, the University has had to change the delivery (and in some cases the content) of its programmes, together with certain University services and facilities for the academic year 2020/21.
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This module aims to provide an advanced level understanding of the physics of stars and nuclear astrophysics. In particular, the course will provide an understanding of advanced nucleosynthetic pathways, an analytical underpinning of resonant reaction rates, together with the experimental techniques involved in their determination.
LOTAY Gavin (Physics)
Number of Credits: 15
ECTS Credits: 7.5
Framework: FHEQ Level 6
JACs code: F370
Module cap (Maximum number of students): N/A
Prerequisites / Co-requisites
This module assumes knowledge equivalent to PHY2067 Nuclear and Particle Physics, and PHY2071 introduction to Astronomy.
• Overview of nuclear landscape and the importance of stars in the formation of the chemical elements
The Physics of Stars
• Basic observations and stellar parameters – Hertzsprung-Russell diagram, Mass-Luminosity relationship and colour
• Gravitational contraction and hydrostatic equilibrium
• Main Sequence stellar structure
• Late stellar evolution and compact astronomical objects
• Motivation for neutron-capture nucleosynthesis process. Differences between stable and explosive nucleosynthesis.
• Slow neutron capture process: nucleosynthetic path, physical properties, astrophysical site
• Rapid neutron capture process: nucleosynthetic path, physical properties, astrophysical site
• Other nucleosynthetic process (gamma-process, rp-process) of relevance.
Experimental determination of Resonant Stellar Reaction Rates
• Basic overview of nuclear reactions: energetics; Q-values, reaction cross sections and concept of particle-emission thresholds (Sn, Salpha and Sp)
• Experimental determination of Q-values – Mass measurements with Ion Penning Traps and Heavy-ion Storage Rings.
• Resonant reactions with neutrons and charged particles – concept of broad and narrow resonances.
• Analytical formalism for narrow and broad resonance contributions to stellar reaction rates – key nuclear physics properties of resonance energy, spin and particle partial widths.
• Experimental techniques for the determination of resonant stellar reaction rates –
1. Direct methods using recoil mass spectrometers and need for radioactive ion beams. Direct methods using neutrons and time-of-flight facilities: (n,gamma) as well as (n,p) for vp-process.
2. Indirect methods: (i) Charge exchange reactions, such as (3He,t), and angular distributions (ii) γ-ray spectroscopy; role of angular distributions, lifetimes and mirror symmetry, (iii) β-delayed particle decay spectroscopy; selection rules and logft values, (iv) Measurements of alpha-particle decay branches using transfer reactions and (iv) Spectroscopic factors from (d,p) and (3He,d) transfer reactions and principles of scattering theory.
3. Broad resonance studies and R-Matrix theory: example of 18F(p,alpha) and its role in the destruction of the potential cosmic gamma-ray emitter 18F in novae.
Contemporary Nuclear Physics Facilities
• Overview of nuclear physics research worldwide and types of facilities available.
• Nuclear experiment datasets and their manipulation.
|Assessment type||Unit of assessment||Weighting|
|Coursework||TAKE HOME TEST||30|
|Examination||Closed book formal 1.5 hour examination. Students will answer 2 questions from a set of 3.||70|
The proposed assessment strategy for this module will involve:
• 30% for a take-home class test of exam-style questions. Feedback will be provided. Coursework set in week 5, to be submitted after Easter break (typically week 8)
• 70% for a final, 1.5 hour closed book examination where students will answer 2 questions from a set of 3.
- Provide an understanding of the underlying physics behind the formation of stars and stellar evolution, including computational modelling.
- Provide an understanding of nucleosynthesis paths: s-process, r-process and p-process; the physical properties and their astrophysical sites;
- Provide an understanding of nuclear reaction networks and their relevance in stellar modelling, including contemporary computational tools
- Provide an analytical treatment of resonant stellar reaction rates for both narrow and broad resonance contributions, together with a detailed understanding of the modern experimental techniques used in obtaining the key nuclear physics information required.
- Provide an understanding on current experiment nuclear facilities and the types of datasets that are in place.
|001||The student will be knowledgeable about current stellar models and will be able to describe how stars of different masses are born and evolve in time. The student will understand the Hertzsprung-Russell diagram. The student will identify the different density and temperature regimes occurring inside stars and will be aware of how dense quantum fluids and extremely hot relativistic gases impact stellar properties.||K|
|002||The student will be able to describe in detail different nucleosynthetic paths, including the various nuclear physics data required to build them and the nuclear reaction networks involved.||K|
|003||The student will be able to perform resonant stellar reaction rate calculations at given temperatures for a variety of reactions.||CK|
|004||The students will have understanding of contemporary nuclear physics facilities and the types of experiments that can be run in them.||KP|
C - Cognitive/analytical
K - Subject knowledge
T - Transferable skills
P - Professional/Practical skills
Overall student workload
Independent Study Hours: 117
Lecture Hours: 33
Methods of Teaching / Learning
The learning and teaching methods include:
Formal lecture based module:
• 33 hours of lectures/tutorials split approximately in 20h of lectures, 11h of tutorials and 2h of computational sessions.
Indicated Lecture Hours (which may also include seminars, tutorials, workshops and other contact time) are approximate and may include in-class tests where one or more of these are an assessment on the module. In-class tests are scheduled/organised separately to taught content and will be published on to student personal timetables, where they apply to taken modules, as soon as they are finalised by central administration. This will usually be after the initial publication of the teaching timetable for the relevant semester.
Reading list for ADVANCED NUCLEAR ASTROPHYSICS : http://aspire.surrey.ac.uk/modules/phy3059
Programmes this module appears in
|Physics with Nuclear Astrophysics BSc (Hons)||2||Optional||A 40% weighted aggregate with one or more units of assessments having to be passed at 40% is required to pass the module|
|Physics with Astronomy BSc (Hons)||2||Optional||A 40% weighted aggregate with one or more units of assessments having to be passed at 40% is required to pass the module|
|Physics BSc (Hons)||2||Optional||A 40% weighted aggregate with one or more units of assessments having to be passed at 40% is required to pass the module|
Please note that the information detailed within this record is accurate at the time of publishing and may be subject to change. This record contains information for the most up to date version of the programme / module for the 2021/2 academic year.