β-delayed Fission in r-process Nucleosynthesis

被引：60

作者：

Mumpower, M. R. ^{[1
]}

Kawano, T. ^{[1
]}

Sprouse, T. M. ^{[2
]}

Vassh, N. ^{[2
]}

Holmbeck, E. M. ^{[2
]}

Surman, R. ^{[2
]}

Moller, P. ^{[1
]}

机构：

[1] Los Alamos Natl Lab, Theoret Div, Los Alamos, NM 87545 USA

[2] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 869卷 / 01期

关键词：

binaries: close; gravitational waves; nuclear reactions; nucleosynthesis; abundances; NUCLEAR PROPERTIES; ELEMENTS; STATE; CONSISTENCY; ACCURACY; CAPTURE; MERGERS; ORIGIN; YIELDS; SPEED;

D O I：

10.3847/1538-4357/aaeaca

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present beta-delayed neutron emission and beta-delayed fission ( beta df) calculations for heavy, neutron-rich nuclei using the coupled Quasi-Particle Random Phase Approximation plus Hauser-Feshbach (QRPA+HF) approach. From the initial population of a compound nucleus after beta-decay, we follow the statistical decay, taking into account competition between neutrons, gamma-rays, and fission. We find a region of the chart of nuclides where the probability of beta df is similar to 100%, which likely prevents the production of superheavy elements in nature. For a subset of nuclei near the neutron dripline, neutron multiplicity and the probability of fission are both large, leading to the intriguing possibility of multi-chance beta df, a decay mode for extremely neutron-rich heavy nuclei. In this decay mode, beta-decay can be followed by multiple neutron emission, leading to subsequent daughter generations that each have a probability to fission. We explore the impact of beta df in rapid neutron-capture process (gamma-process) nucleosynthesis in the tidal ejecta of a neutron star-neutron star merger and show that it is a key fission channel that shapes the final abundances near the second gamma-process peak.

引用

页数：6

共 50 条

[31] The r-process nucleosynthesis and related challenges
Goriely, S.
[J]. NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS, 2019, 42 (2-3):
[32] R-PROCESS NUCLEOSYNTHESIS - DYNAMICAL MODEL
HILLEBRANDT, W
TAKAHASHI, K
KODAMA, T
[J]. ASTRONOMY & ASTROPHYSICS, 1976, 52 (01) : 63 - 68
[33] Neutrino capture and r-process nucleosynthesis
Meyer, BS
McLaughlin, GC
Fuller, GM
[J]. PHYSICAL REVIEW C, 1998, 58 (06): : 3696 - 3710
[34] Current status of r-process nucleosynthesis
Kajino, T.
Aoki, W.
Balantekin, A. B.
Diehl, R.
Famiano, M. A.
Mathews, G. J.
[J]. PROGRESS IN PARTICLE AND NUCLEAR PHYSICS, 2019, 107 : 109 - 166
[35] Neutrino capture and r-process nucleosynthesis
Meyer, BS
[J]. INTERSECTIONS BETWEEN PARTICLE AND NUCLEAR PHYSICS - 6TH CONFERENCE, 1997, (412): : 992 - 997
[36] R-process Nucleosynthesis in Supernova Explosion
Saruwatari, M.
Hashimoto, M.
Kotake, K.
Yamada, S.
[J]. FRONTIERS IN NUCLEAR STRUCTURE, ASTROPHYSICS, AND REACTIONS (FINUSTAR 3), 2011, 1377 : 420 - 422
[37] The r-Process in the region of transuranium elements and the contribution of fission products to the nucleosynthesis of nuclei with A ≤ 130
I. V. Panov
I. Yu. Korneev
F. -K. Thielemann
[J]. Astronomy Letters, 2008, 34 : 189 - 197
[38] The r-Process in the region of transuranium elements and the contribution of fission products to the nucleosynthesis of nuclei with A≤130
Panov, I. V.
Korneev, I. Yu.
Thielemann, F. -K.
[J]. ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS, 2008, 34 (03): : 189 - 197
[39] The role of fission in the r-process
Martinez-Pinedo, G.
Mocelj, D.
Zinner, N. T.
Kelic, A.
Langanke, K.
Panov, I.
Pfeiffer, B.
Rauscher, T.
Schmidt, K.-H.
Thielemann, F.-K.
[J]. PROGRESS IN PARTICLE AND NUCLEAR PHYSICS VOL 59, NO 1, 2007, 59 (01): : 199 - 205
[40] NEUTRON CAPTURE RATES AND r-PROCESS NUCLEOSYNTHESIS
Surman, R. A.
Mumpower, M. R.
McLaughlin, G. C.
Sinclair, R.
Hix, W. R.
Jones, K. L.
[J]. CAPTURE GAMMA-RAY SPECTROSCOPY AND RELATED TOPICS, 2013, : 304 - 313

← 1 2 3 4 5 →