scholarly journals Spin-Dependent Description of the Lowest Excitation Energy of the Natural Parity States in Even-Even Nuclei (abstract)

2009 ◽  
Author(s):  
Guanghao Jin ◽  
Jin-Hee Yoon ◽  
Beverly Karplus Hartline ◽  
Renee K. Horton ◽  
Catherine M. Kaicher
Keyword(s):  
Excitation Energy ◽  
Natural Parity

scholarly journals Universal expression for the lowest excitation energy of natural parity even multipole states

2008 ◽  
Vol 799 (1-4) ◽  
pp. 46-55 ◽  
Author(s):  
Doohwan Kim ◽  
Eunja Ha ◽  
Dongwoo Cha
Keyword(s):  
Excitation Energy ◽  
Natural Parity ◽  
Universal Expression

scholarly journals Spin?Parity Combinations in 32S

1973 ◽  
Vol 26 (6) ◽  
pp. 747 ◽  
Author(s):  
PR Gardner ◽  
DC Kean ◽  
RH Spear ◽  
AM Baxter ◽  
RAI Bell ◽  
...  
Keyword(s):  
Solid State ◽  
Excitation Energy ◽  
Negative Parity ◽  
Excitation Energies ◽  
Spin Parity ◽  
Magnetic Analysis ◽  
Parity Level ◽  
Natural Parity

Inelastically scattered IX-particles from the reaction 32S(IX, 1X')32S have been studied with solid state counters at extreme backward angles in order to determine spin-parity combinations for levels in 32S at excitation energies Ex up to 7 �15 MeV. The results confirm the well-established spin and parity values, show that the 5� 798 MeV spin 1 state has negative parity, and provide narrow limits for the possible spin and parity values of the 6'410,6' 666,6' 762, and 6� 854 MeV levels. A previously unreported natural parity level was found at Ex = 6�58 MeV. Magnetic analysis of the reaction 32S(p, p')32S confirmed the existence of this level and established its excitation energy as 6�581�0�003 MeV. Particle-y-ray coincidence studies showed that this level decays predominantly by y-ray transitions to the 2�23 MeV 2 + state.

PURE α-208Pb STATES IN 212Po REVEALED BY THEIR ENHANCED E1 DECAYS: A NOVEL α CLUSTERING

2011 ◽  
Vol 20 (04) ◽  
pp. 785-788
Author(s):  
ALAIN ASTIER ◽  
PAVEL PETKOV ◽  
MARIE-GENEVIÈVE PORQUET ◽  
DORU S. DELION ◽  
PETER SCHUCK
Keyword(s):  
Excitation Energy ◽  
Energy Range ◽  
Shell Model ◽  
Excited States ◽  
Natural Parity

Excited states in 212 Po have been populated by α transfer using the 208 Pb (18 O ,14 C ) reaction and studied with the Euroball γ multidetector array. Very enhanced E1 transitions have been revealed by very short lifetimes measured by the DSAM method, found in the [0.1-1.4] ps range. The emitting states, which have non-natural parity values, are the fingerprints of the "α-208 Pb " structure present in 212 Po . They are in the same excitation-energy range as the states issued from shell-model configurations.

Thymine Dimerization Induced by Oxidative DNA Lesions and Epigenetic Intermediates via Triplet-Triplet Energy Transfer

2020 ◽  
Author(s):  
Mauricio Lineros-Rosa ◽  
Antonio Francés-Monerris ◽  
Antonio Monari ◽  
Miguel Angél Miranda ◽  
Virginie Lhiaubet-Vallet
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Transient Absorption ◽  
Theoretical Calculations ◽  
Dna Lesions ◽  
Transient Absorption Spectroscopy ◽  
Triplet Energy ◽  
Pyrimidine Dimers ◽  
Triplet Energy Transfer ◽  
Dna Nucleobases

Interaction of nucleic acids with light is a scientific question of paramount relevance not only in the understanding of life functioning and evolution, but also in the insurgence of diseases such as malignant skin cancer and in the development of biomarkers and novel light-assisted therapeutic tools. This work shows that the UVA portion of sunlight, not absorbed by canonical DNA nucleobases, can be absorbed by 5-formyluracil (ForU) and 5-formylcytosine (ForC), two ubiquitous oxidative lesions and epigenetic intermediates present in living beings in natural conditions. We measure the strong propensity of these molecules to populate triplet excited states able to transfer the excitation energy to thymine-thymine dyads, inducing the formation of the highly toxic and mutagenic cyclobutane pyrimidine dimers (CPDs). By using steady-state and transient absorption spectroscopy, NMR, HPLC, and theoretical calculations, we quantify the differences in the triplet-triplet energy transfer mediated by ForU and ForC, revealing that the former is much more efficient in delivering the excitation energy and producing the CPD photoproduct. Although significantly slower than ForU, ForC is also able to harm DNA nucleobases and therefore this process has to be taken into account as a viable photosensitization mechanism. The present findings evidence a rich photochemistry crucial to understand DNA photodamage and of potential use in the development of biomarkers and non-conventional photodynamic therapy agents.

Interplay of collective and noncollective modes at low excitation energy in spherical nuclei

1998 ◽  
Vol 29 (6) ◽  
pp. 606 ◽  
Author(s):  
M. Grinberg
Keyword(s):  
Excitation Energy ◽  
Spherical Nuclei

scholarly journals Wavelength-Dependent Nonlinear Absorption in Palladium Nanoparticles

2021 ◽  
Vol 11 (4) ◽  
pp. 1640
Author(s):  
Chunyu Chen ◽  
Jun Wang ◽  
Yachen Gao
Keyword(s):  
Surface Plasmon Resonance ◽  
Excitation Energy ◽  
Systematic Study ◽  
Nonlinear Absorption ◽  
Palladium Nanoparticles ◽  
Excitation Wavelength ◽  
Saturated Absorption ◽  
Multi Wavelength ◽  
Resonant Region ◽  
Absorption Characteristics

This paper aims to study the nonlinear absorption characteristics of palladium nanoparticles (PdNPs) at off-resonant wavelengths. For this purpose, multi-wavelength (500–650 nm) nanosecond Z-scan technique was used. The experimental results indicate that saturated absorption (SA) and the transition from SA to reverse saturated absorption (RSA) can occur, and depends on the excitation wavelength and energy. When the excitation wavelength is constant, with the increase of excitation energy, PdNPs change from SA to RSA. When the excitation energy is constant, with the excitation wavelength approaching surface plasmon resonance (SPR), PdNPs change from SA to RSA. This phenomenon of SA and RSA under multi-wavelength excitation in the off-resonant region provides a supplement for the systematic study of the nonlinear absorption of PdNPs.

scholarly journals Chemical in‐depth analysis of (Ca/Sr)F 2 core–shell like nanoparticles by X‐ray photoelectron spectroscopy with tunable excitation energy

2021 ◽  
Vol 53 (5) ◽  
pp. 494-508
Author(s):  
Anja Müller ◽  
Thoralf Krahl ◽  
Jörg Radnik ◽  
Andreas Wagner ◽  
Carsten Kreyenschulte ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Photoelectron Spectroscopy ◽  
Core Shell ◽  
X Ray ◽  
Depth Analysis
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