Nuclear ground state properties of strontium isotopes (78≤A≤100) by laser spectroscopy

Buchinger, F.; Ramsay, E. B.; Silverans, R. E.; Lievens, Peter; Arnold, E.; Neu, W.; Neugart, R.; Wendt, Κ.; Ulm, G.

doi:10.1063/1.37031

Cited by 3 publications

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“…To estimate the contribution, the inelastic excitation of 95 Sr was taken into account through an effective deformation length. A value of δ n = 1.1 fm reproduces the measured (d, d ) cross section and is consistent with the spherical nature of 95 Sr determined from the charge radius [23] and the neighboring 94,96 Sr [28,29]. Changes to the spectroscopic factors are less than 10 % and do not alter the conclusion presented in the following.…”

supporting

confidence: 84%

“…The wave functions of the 0 + 2,3 states in 96 Sr would therefore be 0 + 2 = a 0 + sph + √ 1 − a 2 0 + def and 0 + 3 = √ 1 − a 2 0 + sph −a 0 + def , respectively, with the mixing amplitude a. Given that the ground state of 95 Sr has a nearly spherical shape [23], a substantial re-arrangement of the valence nucleons would be required in order to directly populate a strongly deformed configuration in 96 Sr through a single-step transfer reaction such as (d,p). It is therefore assumed that there was negligible direct population of the deformed configuration, 0 + def , in this experiment and so the strength of the 0 + 2,3 states in 96 Sr is a direct measure of the 0 + sph content of the excited 1229 and 1465 keV state wave functions.…”

Section: Sharc (Silicon Highly-segmented Array For Reactions Andmentioning

confidence: 99%

“…While in an independent particle picture the π[0g 9/2 ] orbital is completely empty in Zr, adding neutrons to the ν[0g 7/2 ] orbital enables the promotion of protons from the lower lying orbitals to the deformation-driving π[0g 9/2 ] orbital [2,3]. The resulting sudden transition from spherical to deformed ground states and the emergence of shape-coexisting states in the vicinity of N = 60 and Z = 40 has been a subject of considerable interest for many years, both theoretically [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and experimentally [22][23][24][25][26][27][28][29].…”

mentioning

confidence: 99%

“…In Sr, the shape transition is evident through measurements of binding energies [30], charge radii [23], excitation energies and quadrupole transition probabilities of low-lying states [24,27,28]. Low-lying 0 + states with strong electric monopole (E0) transitions between them indicate the coexistence of states with different intrinsic deformations or the occurrence of strongly mixed configurations [31].…”

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confidence: 99%

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Shape coexistence and mixing of low-lying 0+ states in 96Sr

et al. 2018

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The low energy excited 0 + 2,3 states in 96 Sr are amongst the most prominent examples of shape coexistence across the nuclear landscape. In this work, the neutron [2s 1/2 ] 2 content of the 0 + 1,2,3 states in 96 Sr was determined by means of the d( 95 Sr,p) transfer reaction at the TRIUMF-ISAC2 facility using the SHARC and TIGRESS arrays. Spectroscopic factors of 0.19(3) and 0.22 (3) were extracted for the 96 Sr ground and 1229 keV 0 + states, respectively, by fitting the experimental angular distributions to DWBA reaction model calculations. A detailed analysis of the γ-decay of the isomeric 0 + 3 state was used to determine a spectroscopic factor of 0.33(13). The experimental results are compared to shell model calculations, which predict negligible spectroscopic strength for the excited 0 + states in 96 Sr. The strengths of the excited 0 + 2,3 states were also analyzed within a two-level mixing model and are consistent with a mixing strength of a 2 =0.40(14) and a difference in intrinsic deformations of |∆β| = 0.31(3). These results suggest coexistence of three different configurations in 96 Sr and strong shape mixing of the two excited 0 + states.

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confidence: 84%

Section: Sharc (Silicon Highly-segmented Array For Reactions Andmentioning

confidence: 99%

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Shape coexistence and mixing of low-lying 0+ states in 96Sr

et al. 2018

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“…In sediments, plutonium is likely to exist in the tetravalent state [40,43,47]. [70,71], photon correlation spectroscopy, photoacoustic detection of light scattering [72], and laser--induced breakdown spectroscopy [73,74].…”

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confidence: 99%

Molecular Forensic Science Analysis of Nuclear Materials

Reilly

2012

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Concerns over the proliferation and instances of nuclear material in the environment have increased interest in the expansion of nuclear forensics analysis and attribution programs. A new related field, molecular forensic science (MFS) has helped meet this expansion by applying common scientific analyses to nuclear forensics scenarios. In this work, MFS was applied to three scenarios related to nuclear forensics analysis. In the first, uranium dioxide was synthesized and aged at four sets of static environmental conditions and studied for changes in chemical speciation. The second highlighted the importance of bulk versus particle characterizations by analyzing a heterogeneous industrially prepared sample with similar techniques. In the third, mixed uranium/plutonium hot particles were collected from the McGuire Air Force Base BOMARC Site and analyzed for chemical speciation and elemental surface composition. This work has identified new signatures and has indicated unexpected chemical behavior under various conditions. These findings have lead to an expansion of basic actinide understanding, proof of MFS as a tool for nuclear forensic science, and new areas for expansion in these fields. v At each step in my life, I have considered myself lucky. I have worked hard, but the credit should go to my friends and family. Without their help, love, and support, I would not have completed this journey. I came from small beginnings, but with the support my parents, Dave and Lisa Reilly; I have come this far and will continue to honor them, my many friends, colleagues, and mentors by continuing to further myself as a scientist and person. vi TABLE OF CONTENTS ABSTRACT .

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