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首页轻锕系核素225,227 Pa裂变模式的相互作用研究
"裂变模式在轻act系原子核225,227 Pa的质量分布中的相互作用" 这篇研究文章发表在Physics Letters B期刊上,主要探讨了轻actinide原子核225,227 Pa在裂变过程中的不同模式及其相互作用。实验通过对19 F + 206,208 Pb聚变反应中产生的225,227 Pa核的裂变碎片质量分布进行测量,以分析裂变行为。在聚变势垒能量附近,研究发现质量角相关性并未显示出类似裂变事件的迹象。 通过拟合高斯分布来分析质量分布并计算质量方差,研究者观察到在低于势垒能量时,225,227 Pa核的质量方差随着能量降低而增加。这一现象暗示着可能存在不对称裂变事件与对称裂变事件的混合。这一结果与224,226 Th和228 U的裂变特性相吻合,这些核在相似能量条件下显示了双模裂变的过程。 双模裂变是指在裂变过程中出现两种不同的主导模式,这可能是由于壳效应对势能表面形态的改变。壳效应是指原子核中电子壳层结构对核性质的影响。在较低的激发能量(约30-50 MeV)下,225,227 Pa核的质量方差的能依赖性为壳效应在裂变过程中的持久作用提供了强有力证据。 此外,文章强调了在光act系元素核裂变研究中的新发现,即微观壳效应可能在相对较高的初始激发能量下仍然显著。这项工作不仅增加了我们对轻actinide核裂变机制的理解,也为未来探索核裂变动力学提供了重要参考。研究结果对于核物理学和核能应用,特别是涉及核反应和裂变产物控制的领域,具有重要意义。 关键词包括:融合-裂变、质量分布、不对称裂变、裂变碎片质量分布。
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Physics Letters B 752 (2016) 338–343
Contents lists available at ScienceDirect
Physics Letters B
www.elsevier.com/locate/physletb
Interplay of fission modes in mass distribution of light actinide nuclei
225,227
Pa
R. Dubey
a
, P. Sugathan
a,∗
, A. Jhingan
a
, Gurpreet Kaur
b
, Ish Mukul
a,1
, G. Mohanto
a,2
,
D. Siwal
a,3
, N. Saneesh
a
, T. Banerjee
a
, Meenu Thakur
b
, Ruchi Mahajan
b
, N. Kumar
c
,
M.B. Chatterjee
d
a
Inter University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India
b
Department of Physics, Panjab University, Chandigarh 160014, India
c
Department of Physics and Astrophysics, University of Delhi, New Delhi 110007, India
d
Saha Institute of Nuclear Physics, Kolkata, West Bengal 700064, India
a r t i c l e i n f o a b s t r a c t
Article history:
Received
13 October 2015
Received
in revised form 2 November 2015
Accepted
20 November 2015
Available
online 1 December 2015
Editor:
V. Metag
Keywords:
Fusion–Fission
Mass
distributions
Asymmetric
fission
Fission-fragment mass distributions were measured for
225,227
Pa nuclei formed in fusion reactions of
19
F +
206,208
Pb around fusion barrier energies. Mass-angle correlations do not indicate any quasi-fission
like events in this bombarding energy range. Mass distributions were fitted by Gaussian distribution
and mass variance extracted. At below-barrier energies, the mass variance was found to increase with
decrease in energy for both nuclei. Results from present work were compared with existing data for
induced fission of
224,226
Th and
228
U around barrier energies. Enhancement in mass variance of
225,227
Pa
nuclei at below-barrier energies shows evidence for presence of asymmetric fission events mixed with
symmetric fission events. This is in agreement with the results of mass distributions of nearby nuclei
224,226
Th and
228
U where two-mode fission process was observed. Two-mode feature of fission arises due
to the shell effects changing the landscape of the potential-energy surfaces at low excitation energies. The
excitation-energy dependence of the mass variance gives strong evidence for survival of microscopic shell
effects in fission of light actinide nuclei
225,227
Pa with initial excitation energy ∼30–50 MeV.
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license
(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP
3
.
1. Introduction
The mechanism of mass division in fission of atomic nuclei has
been an intriguing problem in nuclear physics for several years.
Generally, it is observed that asymmetric mass division is pre-
dominant
in spontaneous fission or low energy induced fission of
actinide nuclei [1] whereas nuclei around
208
Pb fission mainly to
symmetric mass division [2]. Some nuclei in the region of
228
Ra
shows three-humped structure of the mass distribution reflecting
contributions from both symmetric and asymmetric mass com-
*
Corresponding author. Tel.: +91 11 26893955; fax: +91 11 26893666.
E-mail
address: sugathan@iuac.res.in (P. Sugathan).
1
Present address: Department of Particle Physics and Astrophysics, Weizmann
Institute of Science, Rehovot 76100, Israel.
2
Present address: Nuclear Physics Division, Bhabha Atomic Research Centre,
Mumbai 400085, India.
3
Present address: Department of Chemistry and Center for Exploration of Energy
and Matter, Indiana University, 2401 Milo B. Sampson Lane, Bloomington, IN 47408,
USA.
ponents [3,4]. With growing excitation energy of the fissioning
nucleus, the asymmetric mass distribution changes to symmetric
Gaussian distribution. These characteristics are explained according
to the concept of independent fission channels (modes) which cor-
responds
to specific valleys in the potential-energy surface (PES)
of the fissioning nucleus [1,5,6]. The origin of these valleys has
been attributed to shell structures modifying the potential energy
landscape of the deformed system [7–10]. More recent calculation
of five-dimensional PES by Möller et al. well predicts the pres-
ence
of two deformation paths; one path with elongated scission
configuration leading to symmetric mass division and the other
shell influenced more compact scission configuration leading to
asymmetric mass division [11]. Two-mode nature of fission phe-
nomenon
has been observed in induced fission of light and heavy
actinides [12–16]. The effects of A, Z and characteristics of final
mass division from each fission mode has been studied extensively.
The seminal work by Schmidt et al. on the charge distribution of
fission fragments (FF) in Coulomb fission of 70 neutron deficient
isotopes (Z = 85–92) suggested that with increasing nucleon num-
http://dx.doi.org/10.1016/j.physletb.2015.11.060
0370-2693/
© 2015 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by
SCOAP
3
.
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