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Fragmentation in Proton-Nucleus Reactions from 100 to 1400 MeV
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The heaviest fragments, recoils, have been studied in proton and deuteron induced 28Si reactions and proton-20Ne reactions at 100-300 MeV per nucleon. Inclusive charge and angular distributions and coincidences between He nuclei and recoils have been compared to two theoretical models, Dubna Cascade Model and JAERI Quantum Molecular Dynamics. The overall agreement was good for the reactions with 28Si, however the angular distributions of He fragments could not be reproduced.

For the 20Ne reactions the recoil angular distributions were only reproduced for large angles. There was a significant underestimation at small angles and low recoil charge. α-clustering in the bombarding nucleus is a possible explanation for the deviations. In the 100 MeV per nucleon reactions all assumptions of the models may not be valid and the agreement was worst for these reactions.

In proton-natXe reactions intermediate mass fragments have been studied from 200 to 1400 MeV. Slow ramping was used to scan the energy. Charge distributions and a caloric curve have been compared to Cascade Fragmentation Evaporation Model. Charge distributions showed good agreement for fragments with Z<8 but the heavier fragments were underestimated.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis , 2008. , 73 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 402
Keyword [en]
Nuclear physics, proton, deuteron, 20Ne, 28Si, Xe, nuclear reactions, inverse kinematics, recoils, intermediate mass fragments, angular distribution, DCM model, JQMD model, CFEM model, single event upset
Keyword [sv]
Kärnfysik
Identifiers
URN: urn:nbn:se:uu:diva-8504ISBN: 978-91-554-7115-6 (print)OAI: oai:DiVA.org:uu-8504DiVA: diva2:171537
Public defence
2008-04-04, Polhemsalen, Ångström Laboratoriet, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2008-03-14 Created: 2008-03-14 Last updated: 2010-01-11Bibliographically approved
List of papers
1. Probing the liquid–gas coexistence in p+Xe reactions from 200 to 1400 MeV
Open this publication in new window or tab >>Probing the liquid–gas coexistence in p+Xe reactions from 200 to 1400 MeV
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2007 (English)In: Physics Letters B, ISSN 0370-2693, Vol. 644, no 4, 228-231 p.Article in journal (Refereed) Published
Abstract [en]

The nuclear equation of state (EOS) is probed from statistical parameters, determined in an excitation function experiment on p + Xe-nat reactions at 200-1400 MeV. Total charge (Z) distributions follow a cascade-[multi]fragmentation-evaporation (CFEM) model well. The caloric curve in regions supposedly dominated by fast processes is compatible with a pure statistical multifragmentation (SMM) process, where the temperature (T)-excitation energy (epsilon*) relation starts in the Fermi liquid phase and progresses into a liquid/gas coexistence region, where it remains up to 1400 MeV. A local peak in T at epsilon* = 2.1 MeV agrees with the idea of sudden fragmentation.

 

National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-96827 (URN)10.1016/j.physletb.2006.11.049 (DOI)000243801600003 ()
Available from: 2008-03-14 Created: 2008-03-14 Last updated: 2011-02-16Bibliographically approved
2. A detector system for studying nuclear reactions relevant to Single Event Effects
Open this publication in new window or tab >>A detector system for studying nuclear reactions relevant to Single Event Effects
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2007 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, Vol. 578, no 2, 385-398 p.Article in journal (Refereed) Published
Abstract [en]

We describe a device to study reactions relevant for the Single Event Effect (SEE) in microelectronics by means of 200 A and 300 A MeV, inverse kinematics, Si+H and Si+D reactions. The work is focused on the possibility to measure Z=2–14 projectile fragments as efficiently as possible. During commissioning and first experiments the fourth quadrant of the CELSIUS storage ring acted as a spectrometer to register fragments in two planes of Si strip detectors in the angular region 0–0.6. A combination of ring-structured and sector-structured Si strip detector planes operated at angles 0.6–1.1. For specific event tagging a Si+ phoswich scintillator wall operated in the range 3.9–11.7 and Si ΔEE telescopes of CHICSi type operated at large angles.

Keyword
Single event effects, Fragmentation detectors, Inverse kinematics
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-16747 (URN)10.1016/j.nima.2007.05.318 (DOI)000248930700004 ()
Available from: 2008-06-05 Created: 2008-06-05 Last updated: 2011-11-16
3. 200 and 300 MeV/nucleon Nuclear Reactions Responsible for Single-Event Effecrs in Microelectronics
Open this publication in new window or tab >>200 and 300 MeV/nucleon Nuclear Reactions Responsible for Single-Event Effecrs in Microelectronics
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Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:uu:diva-96829 (URN)
Available from: 2008-03-14 Created: 2008-03-14Bibliographically approved
4. Inclusive production of recoils in 20Ne + 1H reactions ar 100 and 300 MeV/nucleon
Open this publication in new window or tab >>Inclusive production of recoils in 20Ne + 1H reactions ar 100 and 300 MeV/nucleon
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Manuscript (Other academic)
Identifiers
urn:nbn:se:uu:diva-96830 (URN)
Available from: 2008-03-14 Created: 2008-03-14 Last updated: 2010-01-13Bibliographically approved

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