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Nuclear structure aspects of proton and alpha particle decay
KTH, School of Engineering Sciences (SCI), Physics.
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2006. , vii, 40 p.
Series
Trita-FYS, ISSN 0280-316X ; 2006.30
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:kth:diva-3959ISBN: 91-7178-340-7 (print)OAI: oai:DiVA.org:kth-3959DiVA: diva2:10187
Public defence
2006-05-15, Sal FA32, AlbaNova, Roslagstullsbacken 21, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100906Available from: 2006-05-11 Created: 2006-05-11 Last updated: 2010-09-06Bibliographically approved
List of papers
1. Alpha-decay hindrance factors: A probe of mean-field wave function
Open this publication in new window or tab >>Alpha-decay hindrance factors: A probe of mean-field wave function
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2006 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 73, no 6, 064304- p.Article in journal (Refereed) Published
Abstract [en]

A simple model to calculate alpha-decay hindrance factors (HF) with special emphasis on the shape coexistence in the Pb-Po region is presented. Using deformation values obtained from potential energy surface (PES) calculations as the only input, hindrance factors for the alpha decay of Rn and Po isotopes are calculated. The fair agreement between experimental and theoretical hindrance factors suggest that the wave function obtained from the energy minima of the PES calculations contains an important part of the correlations that play a role for the alpha decay. The model is applicable to shape coexistence in the Po and Pb region when minima are well defined. The calculated HF that emerge from these calculations render a different interpretation than the commonly assumed n-particle n-hole picture of the intruder states in the Pb region.

Keyword
even-even nuclei, shape coexistence, intruder states, shell-model, fine-structure, isotopes, neutron, approximation, pb-186
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-15803 (URN)10.1103/PhysRevC.73.064304 (DOI)000238697500013 ()2-s2.0-33745170424 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
2. Shape-changing particle decays of Bi-185 and structure of the lightest odd-mass Bi isotopes
Open this publication in new window or tab >>Shape-changing particle decays of Bi-185 and structure of the lightest odd-mass Bi isotopes
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2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 69, no 5, 054308- p.Article in journal (Refereed) Published
Abstract [en]

Proton and alpha decay of the proton-rich nuclide Bi-185 has been restudied in more detail in the complete fusion reaction Nb-93(Mo-95, 3n)Bi-185 at the velocity filter SHIP. The observed decay pattern of Bi-185 and of the heavier odd-mass isotopes Bi-187,Bi-189,Bi-191,Bi-193 are interpreted based on potential-energy surface calculations. It is shown that the experimental systematics of the particle decays and of the excited states in these nuclei (where known) can be explained by the prolate-oblate shape co-existence at low excitation energy. The observed state in Bi-185 is proposed to be of prolate nature, which is in contrast with the previously proposed oblate interpretation.

Keyword
neutron-deficient isotopes, alpha-decay, intruder states, isomeric states, proton decay, mean-field, nuclei, coexistence, shell, spectroscopy
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-23556 (URN)10.1103/PhysRevC.69.054308 (DOI)000222443600018 ()2-s2.0-4043132559 (Scopus ID)
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
3. Fine structure in the alpha decay of Po-188,Po-192
Open this publication in new window or tab >>Fine structure in the alpha decay of Po-188,Po-192
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2003 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 68, no 5Article in journal (Refereed) Published
Abstract [en]

The alpha decay of Po-188,Po-192 has been reexamined in order to probe the 0(+) states in the daughter nuclei Pb-184,Pb-188 that can be associated with coexisting spherical, oblate, and/or prolate configurations. Improved values were measured for the excitation energy and the feeding alpha -decay intensity of the 0(2)(+) state in Pb-184,Pb-188 and conflicting results on the 0(3)(+) state in Pb-188 were clarified. All known cases of fine structure in the alpha decay of the even-even Po nuclei are reviewed. The reduced alpha-decay width systematics combined with potential-energy-surface calculations confirm the onset of deformation in the ground state of the polonium nuclei around the neutron midshell. An isomeric state with a half-life of 580(100)ns has been identified in Po-192 .

Keyword
gamma-ray spectroscopy, even-even nuclei, shape coexistence, intruder states, mass nuclei, po isotopes, pb-186, po-192, shell
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-23049 (URN)10.1103/PhysRevC.68.054311 (DOI)000187578300021 ()
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
4. Proton emission from triaxial nuclei
Open this publication in new window or tab >>Proton emission from triaxial nuclei
2004 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 70, no 6, 061301- p.Article in journal (Refereed) Published
Abstract [en]

Proton decay from triaxially deformed nuclei is investigated. The deformation parameters corresponding to the mother nucleus are determined microscopically and the calculated decay widths are used to probe the mean-field wave function. The proton wave function in the mother nucleus is described as a resonant state in a coupled-channel formalism. The decay width, as well as the angular distribution of the decaying particle, are evaluated and their dependence upon the triaxial deformation parameters is studied in the decay of Re-161 and Bi-185. It is found that the decay width is very sensitive to the parameters defining the triaxial deformation while the angular distribution is a universal function which does not depend upon details of the nuclear structure.

Keyword
deformed-nuclei, fine-structure, mean-field, drip-line, decay, emitters, radioactivity, state
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-23996 (URN)10.1103/PhysRevC.70.061301 (DOI)000226308100003 ()2-s2.0-13844317776 (Scopus ID)
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved
5. High-spin states in the proton-unbound nucleus Re-161
Open this publication in new window or tab >>High-spin states in the proton-unbound nucleus Re-161
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2006 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 74, no 2, 024316- p.Article in journal (Refereed) Published
Abstract [en]

Excited states in Re-161 were populated using the Cd-106(Ni-58, p2n) reaction at a beam energy of 270 MeV, resulting in the first observation of gamma rays emitted from this nucleus. The reaction products were separated from scattered beam and fission fragments by the gas-filled recoil separator RITU, and were implanted in the double-sided silicon strip detectors of the GREAT spectrometer. Prompt gamma rays were detected by the JUROGAM Ge detector array and were assigned to Re-161 based on alpha- and proton-decay tagging of the implanted reaction products. The near-yrast high-spin level structure, which was delineated to spins around 39/2, is discussed in the context of the total Routhian surface formalism. The level scheme is interpreted in terms of the alignment of h(9/2)/f(7/2) neutrons at lower spins, followed by excitations involving the pi h(11/2) subshell at higher spins.

Keyword
recoil separator, drip-line, spectroscopy, jyfl
National Category
Physical Sciences
Identifiers
urn:nbn:se:kth:diva-15969 (URN)10.1103/PhysRevC.74.024316 (DOI)000240239100025 ()2-s2.0-33747850605 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
6. Mixing of wave functions at different shapes: A study of Alpha Decay Hindrance Factors within the Generator Coordinate Method
Open this publication in new window or tab >>Mixing of wave functions at different shapes: A study of Alpha Decay Hindrance Factors within the Generator Coordinate Method
(English)Manuscript (preprint) (Other academic)
National Category
Subatomic Physics
Identifiers
urn:nbn:se:kth:diva-24363 (URN)
Note
QC 20100906Available from: 2010-09-06 Created: 2010-09-06 Last updated: 2010-09-06Bibliographically approved

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