scholarly journals Pygmy dipole resonance as a constraint on the neutron skin of heavy nuclei

2006 ◽  
Vol 73 (4) ◽  
Author(s):  
J. Piekarewicz
Keyword(s):  
Neutron Skin ◽  
Heavy Nuclei ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance

ISOVECTOR PYGMY DIPOLE EXCITATION IN NEUTRON-RICH NUCLEI

2010 ◽  
Vol 25 (34) ◽  
pp. 2905-2913 ◽  
Author(s):  
KUTSAL BOZKURT
Keyword(s):  
Random Phase ◽  
Nucleon Nucleon ◽  
Strength Distribution ◽  
Experimental Results ◽  
Heavy Nuclei ◽  
Quasiparticle Random Phase Approximation ◽  
Dipole Excitation ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance ◽  
Full Interaction

We investigate isovector pygmy dipole resonance (IVPDR) for the case of neutron-rich nuclei 68 Ni , 130 Sn and 134 Sn using effective nucleon–nucleon Skyrme interaction. We use the Hartree–Fock–Bogoliubov (HFB) theory and employ the (quasiparticle) random phase approximation (Q)RPA. We calculate and compare the PDR strength in the PDR energy region for the case of density dependent central and full interaction modes for RPA and QRPA calculations. We observe that the results for the pygmy dipole resonance for neutron-rich soft nuclei 68 Ni that we consider are in reasonable agreement with their experimental results in both interactions and calculations. We also study the PDR for highly neutron-rich heavy nuclei, such as 130 Sn and 134 Sn . We see that only the QRPA calculation with full interaction is in good agreement with the experimental results for these nuclei and with a recent study in the literature. We find that the PDR strength distribution sensitively depends on the chosen interaction modes, especially for the neutron-rich heavy nuclei 134 Sn .

scholarly journals Connecting the pygmy dipole resonance to the neutron skin

2013 ◽  
Vol 88 (4) ◽  
Author(s):  
V. Baran ◽  
M. Colonna ◽  
M. Di Toro ◽  
A. Croitoru ◽  
D. Dumitru
Keyword(s):  
Neutron Skin ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance

PYGMY DIPOLE RESONANCE AND TWO NEUTRON SEPARATION ENERGIES IN SOFT AND HEAVY NUCLEI

2010 ◽  
Vol 19 (07) ◽  
pp. 1371-1381
Author(s):  
KUTSAL BOZKURT
Keyword(s):  
Mean Field Theory ◽  
Random Phase ◽  
Mean Field ◽  
Nucleon Nucleon ◽  
Tensor Interaction ◽  
Binding Energies ◽  
Heavy Nuclei ◽  
Hartree Fock ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance

We investigate isovector pygmy dipole resonance (IVPDR) for the case of neutron-rich soft nuclei 68 Ni , and heavy nuclei such as 112 Sn and 208 Pb using effective nucleon–nucleon Skyrme interaction. We use the mean-field theory and employ the random phase approximation (RPA). We observe that our results for the pygmy dipole resonance (PDR) for neutron-rich nuclei are in reasonable agreement with their experimental results. We also predict PDR for very neutron-rich heavy nuclei. We then study two-neutron separation Skyrme energies (S2n) using the Hartree–Fock + BCS with and without tensor interaction in the same nucleus and compare our results with their experimental values. We see that the total binding energies of nuclei 208 Pb are not extremely sensitive to the tensor interaction.

Formation of α clusters in dilute neutron-rich matter

Science ◽  
2021 ◽  
Vol 371 (6526) ◽  
pp. 260-264 ◽  
Author(s):  
Junki Tanaka ◽  
Zaihong Yang ◽  
Stefan Typel ◽  
Satoshi Adachi ◽  
Shiwei Bai ◽  
...  
Keyword(s):  
Cross Sections ◽  
Cluster Formation ◽  
Reaction Cross ◽  
Skin Thickness ◽  
Neutron Skin ◽  
Heavy Nuclei ◽  
Α Decay ◽  
Neutron Skin Thickness ◽  
Reaction Cross Sections ◽  
Α Particles

The surface of neutron-rich heavy nuclei, with a neutron skin created by excess neutrons, provides an important terrestrial model system to study dilute neutron-rich matter. By using quasi-free α cluster–knockout reactions, we obtained direct experimental evidence for the formation of α clusters at the surface of neutron-rich tin isotopes. The observed monotonous decrease of the reaction cross sections with increasing mass number, in excellent agreement with the theoretical prediction, implies a tight interplay between α-cluster formation and the neutron skin. This result, in turn, calls for a revision of the correlation between the neutron-skin thickness and the density dependence of the symmetry energy, which is essential for understanding neutron stars. Our result also provides a natural explanation for the origin of α particles in α decay.

scholarly journals Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in Pb208

2020 ◽  
Vol 125 (10) ◽  
Author(s):  
M. Spieker ◽  
A. Heusler ◽  
B. A. Brown ◽  
T. Faestermann ◽  
R. Hertenberger ◽  
...  
Keyword(s):  
Single Particle ◽  
Particle Structure ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance

Study of the pygmy dipole resonance in 94Mo using the coincidence technique

2013 ◽  
Vol 906 ◽  
pp. 94-107 ◽  
Author(s):  
V. Derya ◽  
J. Endres ◽  
M. Elvers ◽  
M.N. Harakeh ◽  
N. Pietralla ◽  
...  
Keyword(s):  
Coincidence Technique ◽  
Dipole Resonance ◽  
Pygmy Dipole Resonance

Pygmy Dipole Resonance: Status of the Theory and Unsolved issues

2009 ◽  
Author(s):  
A. Avdeyenkov ◽  
F. Gruemmer ◽  
S. Kamerdzhiev ◽  
S. Krewald ◽  
N. Lyutorovich ◽  
...  
Keyword(s):  
Dipole Resonance ◽  
Pygmy Dipole Resonance

Investigation of pygmy dipole resonance in 154Sm

2017 ◽  
Author(s):  
Huseynqulu Quliyev ◽  
Zemine Zenginerler ◽  
Ekber Guliyev ◽  
Ali Akbar Kuliev
Keyword(s):  
Dipole Resonance ◽  
Pygmy Dipole Resonance
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