Search for the Pygmy Dipole Resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi>Ni</mml:mi><mml:mprescripts /><mml:none /><mml:mn>68</mml:mn></mml:mmultiscripts></mml:math>at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>600</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>MeV</mml:mi><mml:mo>/</mml:mo><mml:mtext mathvariant="normal">nucleon</mml:mtext></mml:math>

Wieland, O.; Bracco, A.; Camera, F.; Benzoni, G.; Blasi, N.; Brambilla, S.; Crespi, F. C. L.; Leoni, S.; Million, B.; Nicolini, R.; Maj, A.; Bednarczyk, P.; Grȩbosz, J.; Kmiecik, M.; Męczyński, W.; Styczeń, J.; Aumann, T.; Banu, A.; Beck, T.; Becker, F.; Cáceres, L.; Doornenbal, P.; Emling, H.; Gerl, J.; Geißel, H.; Górska, M.; Kavatsyuk, O.; Kavatsyuk, M.; Kojouharov, I.; Kurz, N.; Lozeva, R.; Saito, N.; Saito, T.; Schaffner, H.; Wollersheim, H. J.; Jolie, J.; Reiter, P.; Warr, N.; DeAngelis, G.; Gadea, A.; Napoli, D. R.; Lenzi, S. M.; Lunardi, S.; Balabanski, D. L.; LoBianco, G.; Petrache, C. M.; Saltarelli, A.; Castoldi, M.; Zucchiatti, A.; Walker, Joel W.; Bürger, A.

doi:10.1103/physrevlett.102.092502

Cited by 249 publications

(199 citation statements)

References 28 publications

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“…If found to be of E1 character, it would very probably be the result of a pygmy resonance, often described as owing to the oscillation of the neutron skin with respect to a N ≈ Z core [57,58]. If so, the measured resonance would be in agreement with the observations for 68 Ni, which also presents an E1 pygmy resonance at E γ 9.6 MeV that has been interpreted as a possible neutron-skin oscillation [54,59]. However, this possible resonance at E γ 9.2 MeV could as well be of M1 character, being in that case probably owing to M1 spin-flip transitions.…”

Section: -7supporting

confidence: 72%

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C

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Particle-γ coincidence data have been analyzed to obtain the nuclear level density and the γ -strength function of 64 Ni by means of the Oslo method. The level density found in this work is in very good agreement with known energy levels at low excitation energies as well as with data deduced from particle-evaporation measurements at excitation energies above E x ≈ 5.5 MeV. The experimental γ -strength function presents an enhancement at γ energies below E γ ≈ 3 MeV and possibly a resonancelike structure centered at E γ ≈ 9.2 MeV. The obtained nuclear level density and γ -strength function have been used to estimate the (n,γ ) cross section for the s-process branch-point nucleus 63 Ni, of particular interest for astrophysical calculations of elemental abundances.

show abstract

Section: -7supporting

confidence: 72%

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C

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“…These characteristics are in agreement with those extracted from the recent data reported in Ref. [14] which are also included in Fig. 8.…”

Section: Resultssupporting

confidence: 91%

Relativistic two-phonon model for the low-energy nuclear response

2013

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A two-phonon version of the relativistic quasiparticle time blocking approximation introduces as a new class of many-body models for nuclear structure calculations based on the covariant energy density functional. As a fully consistent extension of the relativistic quasiparticle random phase approximation, the relativistic two-phonon model implies fragmentation of nuclear states over twoquasiparticle and two-phonon configurations coupled to each other. In particular, we show how the lowest two-phonon 1 − state, identified as a member of the [2 + ⊗ 3 − ] quintuplet, emerges from the coherent two-quasiparticle pygmy dipole mode in vibrational nuclei. The inclusion of the twophonon configurations into the model space allows a quantitative description of the positions and the reduced transition probabilities of the lowest 1 − states in tin isotopes 112,116,120,124 Sn as well as the low-energy fraction of the dipole strength below the giant dipole resonance without any adjustment procedures. The model is applied to the low-lying dipole strength in neutron-rich 68,70,72 Ni isotopes. Recent experimental data for 68 Ni are reproduced fairly well.

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“…In these studies, the invariant-mass method was used, requiring the detection of all the decay products. These experiments yielded evidence for the appearance of a lowenergy dipole mode the nature of which is still under discussion; it may correspond to an oscillation of a neutron skin against a nucleus core and possibly mixed with isoscalar dipole strength [12,13].…”

Section: Measurement Of the Isoscalar Giant Resonances (Isgr)mentioning

confidence: 99%

Isoscalar response ofNi68toα-particle and deuteron probes

et al. 2015

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Search for the Pygmy Dipole Resonance inNi68at600 MeV/nucleon

Cited by 249 publications

References 28 publications

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C

Relativistic two-phonon model for the low-energy nuclear response

Isoscalar response ofNi68toα-particle and deuteron probes

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Search for the Pygmy Dipole Resonance inNi68at600 MeV/nucleon

Cited by 249 publications

References 28 publications

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the Campo1, Garrote2, Eriksen3 et al. 2016Phys. Rev. C

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the Campo1, Garrote2, Eriksen3 et al. 2016Phys. Rev. C

Relativistic two-phonon model for the low-energy nuclear response

Isoscalar response ofNi68toα-particle and deuteron probes

Contact Info

Product

Resources

About

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C

Statistical γ -decay properties of Ni64 and deduced ( n,γ ) cross section of the
Campo
¹
,
Garrote
²
,
Eriksen
³

et al. 2016
Phys. Rev. C