Enhanced low-energy γ-decay strength of 70Ni and its robustness within the shell model

被引：33

作者：

Larsen, A. C. ^{[1
]}

Midtbo, J. E. ^{[1
]}

Guttormsen, M. ^{[1
]}

Renstrom, T. ^{[1
]}

Liddick, S. N. ^{[2
,3
]}

Spyrou, A. ^{[2
,4
,5
]}

Karampagia, S. ^{[2
]}

Brown, B. A. ^{[2
,4
]}

Achakovskiy, O. ^{[6
]}

Kamerdzhiev, S. ^{[7
]}

Bleuel, D. L. ^{[8
]}

Couture, A. ^{[9
]}

Campo, L. Crespo ^{[1
]}

Crider, B. P. ^{[2
,10
]}

Dombos, A. C. ^{[2
,4
,5
]}

Lewis, R. ^{[2
,3
]}

Mosby, S. ^{[9
]}

Naqvi, F. ^{[2
]}

Perdikakis, G. ^{[2
,5
,11
]}

Prokop, C. J. ^{[2
]}

Quinn, S. J. ^{[2
,4
,5
]}

Siem, S. ^{[1
]}

机构：

[1] Univ Oslo, Dept Phys, N-0316 Oslo, Norway

[2] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[3] Michigan State Univ, Dept Chem, E Lansing, MI 48824 USA

[4] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

[5] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA

[6] Inst Phys & Power Engn, Obninsk 249033, Russia

[7] Natl Res Ctr Kurchatov Inst, Moscow 123182, Russia

[8] Lawrence Livermore Natl Lab, Livermore, CA 94551 USA

[9] Los Alamos Natl Lab, Los Alamos Neutron Sci Ctr, Los Alamos, NM 87545 USA

[10] Mississippi State Univ, Dept Phys & Astron, Mississippi State, MS 39762 USA

[11] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

来源：

PHYSICAL REVIEW C | 2018年 / 97卷 / 05期

基金：

美国国家科学基金会; 欧洲研究理事会; 俄罗斯科学基金会;

关键词：

R-PROCESS; DIPOLE; NUCLEOSYNTHESIS; ASTROPHYSICS; NUCLEI;

D O I：

10.1103/PhysRevC.97.054329

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Neutron-capture reactions on very neutron-rich nuclei are essential for heavy-element nucleosynthesis through the rapid neutron-capture process, now shown to take place in neutron-star merger events. For these exotic nuclei, radiative neutron capture is extremely sensitive to their gamma-emission probability at very low gamma energies. In thiswork, we present measurements of the gamma-decay strength of Ni-70 over the wide range 1.3 <= E-gamma <= 8 MeV. A significant enhancement is found in the gamma-decay strength for transitions with E-gamma < 3 MeV. At present, this is the most neutron-rich nucleus displaying this feature, proving that this phenomenon is not restricted to stable nuclei. We have performed E1-strength calculations within the quasiparticle time-blocking approximation, which describe our data above E-gamma similar or equal to 5 MeV very well. Moreover, large-scale shell-model calculations indicate an M1 nature of the low-energy. strength. This turns out to be remarkably robust with respect to the choice of interaction, truncation, and model space, and we predict its presence in the whole isotopic chain, in particular the neutron-rich Ni-72,Ni-74,Ni-76.

引用

页数：9

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