J. F. Sharpey‐Schafer
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View article: Optical model potential parameter optimization for nucleon-induced reactions on <sup>40</sup>Ca: Implications on <i>γ</i>-ray production cross sections for residual Argon nuclei
Optical model potential parameter optimization for nucleon-induced reactions on <sup>40</sup>Ca: Implications on <i>γ</i>-ray production cross sections for residual Argon nuclei Open
We have optimized the optical model potential (OMP) parameters for nucleon (protons and neutrons) induced reaction on 40Ca using the OPTMAN code available on the RIPL-3 data library. The potentials, geometrical and nuclear deformation para…
View article: Band terminations and maximum spin values with up to 18 aligned particles (and holes) in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>,</mml:mo><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>50</mml:mn></mml:mrow></mml:math> to 82 shells
Band terminations and maximum spin values with up to 18 aligned particles (and holes) in the to 82 shells Open
Observed rotational bands that terminate or appear to terminate at very high spin are analyzed within the configuration constrained cranked Nilsson-Strutinsky (unpaired CNS or CNSB with pairing) formalism. Spin values for the nuclei discus…
View article: First observation of rotational bands in the nucleus $$^{231}$$U
First observation of rotational bands in the nucleus $$^{231}$$U Open
This work reports the first rotational bands observed in the neutron-deficient nucleus $$^{231}$$ U. Excited states were populated in the $$^{232}$$ Th( $$\alpha $$ ,5n) reaction at a beam energy of 52 MeV. Coincident decay $$\gamm…
View article: A proton pairing isomer in 174Hf: Reinterpretation of data and support for the split prolate–oblate pairing approximation for deformed nuclei
A proton pairing isomer in 174Hf: Reinterpretation of data and support for the split prolate–oblate pairing approximation for deformed nuclei Open
The available data on the even–even isotope 174 Hf are reinterpreted to conclude that the low-lying 0 2 + level, usually regarded as a “β vibration”, is actually a proton (2p–2 h) excitation known as a Pairing Isomer. This is the first ide…
View article: First observation of the coexistence of multiple chiral doublet bands and pseudospin doublet bands in the A ≈ 80 mass region
First observation of the coexistence of multiple chiral doublet bands and pseudospin doublet bands in the A ≈ 80 mass region Open
Two nearly degenerate positive-parity bands with the π g2
\n9/2 ⊗ ν g−1
\n9/2 configuration and three nearly
\ndegenerate negative-parity bands with the π g9/2(p3/2, f5/2) ⊗ ν g−1
\n9/2 configuration have been identified
\nin 81Kr. They ar…
View article: High spin structure of 155Dy
High spin structure of 155Dy Open
High spin states in 155Dy have been studied by γ-γ coincidence measurements via the 124Sn(36S, 5n)155Dy reaction at a beam energy of 155 MeV. Eight rotational bands have been populated and observed up to high spin (I<91/2).The band feature…
View article: Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei
Backbending, seniority, and Pauli blocking of pairing correlations at high rotational frequencies in rapidly rotating nuclei Open
Garrett et al. systematically investigated band-crossing frequencies resulting from the rotational alignment of the first pair of $i_{13/2}$ neutrons (AB) in rare-earth nuclei. In that study, evidence was found for an odd-even neutron numb…
View article: DSAM lifetime measurements for the chiral bands in<sup>194</sup>Tl
DSAM lifetime measurements for the chiral bands in<sup>194</sup>Tl Open
When a left-handed and a right-handed nuclear system form in angular momentum space, a pair of nearly degenerate rotational bands is observed. To identify chiral symmetry most important is to establish near-degeneracy not only in excitatio…
View article: Evidence for Octupole Correlations in Multiple Chiral Doublet Bands
Evidence for Octupole Correlations in Multiple Chiral Doublet Bands Open
Two pairs of positive-and negative-parity doublet bands together with eight strong electric dipole transitions linking their yrast positive- and negative-parity bands have been identified in ^{78}Br. They are interpreted as multiple chiral…
View article: DSAM lifetime measurements for the chiral pair in 194Tl
DSAM lifetime measurements for the chiral pair in 194Tl Open
\n Most important for the identification of chiral symmetry in atomic nuclei is to establish a pair of bands that are near-degenerate in energy, but also in B(M1) and B(E2) transition probabilities. Dedicated lifetime measurements were per…
View article: Gamma ray production cross sections in proton induced reactions on natural Mg, Si and Fe targets over the proton energy range 30 up to 66 MeV
Gamma ray production cross sections in proton induced reactions on natural Mg, Si and Fe targets over the proton energy range 30 up to 66 MeV Open
Gamma-ray excitation functions have been measured for 30, 42, 54 and 66 MeV proton beams accelerated onto C + O (Mylar), Mg, Si, and Fe targets of astrophysical interest at the separate-sector cyclotron of iThemba LABS in Somerset West (Ca…