逆运动学中等压模拟态的核结构研究：谱学因子分析

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"逆运动学中等压模拟共振在= 29处的光谱因子研究" 在核物理学中，壳封闭及其相关的核子魔术数为研究外来核的结构提供了独特的手段。最近在美国国家超导回旋加速器实验室进行了一项实验，以测量在包含等压模拟态$ ^ {47} $ Ar的N = 29原子核的区域中，逆运动学中$ ^ {46} $ Ar的共振弹性质子散射。实验中，研究人员观察到了四个候选共振：一个对应于$ ^ {47} $ Ar的3 / 2-基态，另一个对应于其1 / 2-第一激发态，另外两个可能对应于$ ^ {47 } $ K复合核。观察到的基态共振特性与文献中的值兼容，但是发现1/2态共振的光谱系数明显较低。在这个实验中，研究人员使用了逆运动学技术来研究等压模拟态$ ^ {46} $ Ar的共振弹性质子散射。这种技术可以提供对核子的结构和性质的详细信息。逆运动学技术的优点在于可以研究高激发态的核子结构，而这些结构在传统的粒子加速器实验中无法研究。在这个实验中，研究人员还使用了isobaricanalogue resonance技术来研究等压模拟态$ ^ {46} $ Ar的共振弹性质子散射。这项技术可以提供对核子的结构和性质的详细信息，并且可以研究高激发态的核子结构。研究人员还发现了四个候选共振，这些共振可能对应于$ ^ {47} $ Ar的基态和激发态，以及$ ^ {47 } $ K复合核。这些结果对于理解核子的结构和性质具有重要意义，并且可以为未来研究核子的结构和性质提供重要的参考。在这个实验中，还有许多其他的技术和方法被使用，例如粒子识别、能谱分析等。这些技术和方法可以帮助研究人员更好地理解核子的结构和性质，并且可以提供对核子的详细信息。这个实验对于研究核子的结构和性质具有重要意义，并且可以为未来研究核子的结构和性质提供重要的参考。逆运动学技术和isobaricanalogue resonance技术可以提供对核子的结构和性质的详细信息，并且可以研究高激发态的核子结构。此外，这个实验也证明了美国国家超导回旋加速器实验室的研究能力和技术水平，并且展示了该实验室在核物理学领域的研究能力和技术水平。在未来，研究人员可以继续使用逆运动学技术和isobaricanalogue resonance技术来研究核子的结构和性质，并且可以研究高激发态的核子结构。这些研究可以为理解核子的结构和性质提供重要的参考，并且可以为未来研究核子的结构和性质提供重要的方向。这个实验对于研究核子的结构和性质具有重要意义，并且可以为未来研究核子的结构和性质提供重要的参考。逆运动学技术和isobaricanalogue resonance技术可以提供对核子的结构和性质的详细信息，并且可以研究高激发态的核子结构。

Physics Letters B 778 (2018) 155–160

Contents lists available at ScienceDirect

Physics Letters B

www.elsevier.com/locate/physletb

Study of spectroscopic factors at N = 29 using isobaric analogue

resonances in inverse kinematics

J. Bradt

a,b

, Y. Ayyad

a,1

, D. Bazin

a,b,∗

, W. Mittig

a,b

, T. Ahn

, S. Beceiro Novo

a,b

B.A. Brown

a,b

, L. Carpenter

a,b

, M. Cortesi

, M.P. Kuchera

a,2

, W.G. Lynch

a,b

, S. Rost

a,b,3

N. Watwood

a,b

, J. Yurkon

, J. Barney

a,b

, U. Datta

, J. Estee

a,b

, A. Gillibert

, J. Manfredi

a,b

P. Morfouace

a,4

, D. Pérez-Loureiro

a,5

, E. Pollacco

, J. Sammut

a,b

, S. Sweany

a,b

National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824, USA

Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824, USA

Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA

Saha Institute of Nuclear Physics, Kolkata 700 064, India

CEA Irfu, Centre de Saclay, 91191 Gif-sur-Yvette, France

a r t i c l e i n f o a b s t r a c t

Article history:

Received

12 October 2017

Received

in revised form 20 December 2017

Accepted

8 January 2018

Available

online 17 January 2018

Editor:

D.F. Geesaman

Keywords:

Spectroscopic

factor

Isobaric

analogue state

Resonant

proton elastic scattering

Shell

closure

Single-particle

energy

Shell closures and their associated magic numbers of nucleons provide a unique means for studying

the structure of exotic nuclei far from stability. An experiment was recently performed at the National

Superconducting Cyclotron Laboratory to measure resonant elastic proton scattering on

Ar in inverse

kinematics in the region containing isobaric analogue states of

Ar, an N = 29 nucleus with one neutron

above the N = 28 shell closure. Four candidate re sonances were observed: one corresponding to the 3/2

−

ground state of

Ar, another corresponding to its 1/2

−

ﬁrst excited state, and two that likely correspond

to states in the

K compound nucleus. The observed properties of the ground state resonance were

compatible with values from the literature, but a signiﬁcantly lower spectroscopic factor was found for

the 1/2

−

state resonance.

(http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP

The study of the evolution of shell closures in nuclei far from

stability is an important part of current research in nuclear physics.

For example, tensor forces have been found to have a strong inﬂu-

ence

on the N = 20 shell closure in the oxygen isotopes, where a

new semi-magic number appears at N = 16 [1]. At higher N, nu-

clei

such as

Ca exhibit the well-established properties of magic

numbers at N = 28, the lowest magic number in the chart of the

nuclides that is caused by spin–orbit splitting. The behavior of

Corresponding author at: National Superconducting Cyclotron Laboratory, Michi-

gan

State University, East Lansing, MI 48824, USA.

E-mail

address: bazin@nscl.msu.edu (D. Bazin).

Present address: Nuclear Science Division, Lawrence Berkeley National Labora-

tory,

Berkeley, CA 94720, USA.

Present address: Department of Physics, Davidson College, Davidson, NC 28035,

USA.

Present address: Institute for Advanced Simulation, Forschungszentrum Jülich,

52425 Jülich, Germany.

Present address: GANIL, Boulevard Henri Becquerel, 14000 Caen, France

Present address: Department of Physics and Astronomy, University of Tennessee,

Knoxville, TN 37996, USA.

shell closures is a privileged benchmark for nuclear structure mod-

els

because nuclear properties are more easily deﬁned with fewer

valence nucleons. In addition to binding energies, the orbitals can

be characterized based on their neutron separation energies, defor-

mation,

and collectivity [2]. Among the many reaction tools used

to study these properties, transfer reactions are widely known to

directly provide information on the single-particle properties via

the deduction of single-particle energies and spectroscopic factors.

For

these reasons,

Ar (Z = 18, N = 29) has been the subject

of a variety of complementary experiments to study the behav-

ior

of the N = 28 neutron shell closure two protons below

Ca.

A deduction of the single-particle energies at 10 MeV/u performed

at GANIL by Gaudefroy et al. [3,4] led to the conclusion that the

spin–orbit splitting between the p

3/2

and p

1/2

states is reduced by

45% in

Ar as compared to the isotone

Ca. This conclusion was

questioned in a comment [5] that described the fragmentation of

1/2

strength and noted that one has to take into account the total

strength distribution of this single-particle state in order to deter-

mine

the center of gravity. Gaudefroy et al. [6] addressed this in

a reply where they reported a weaker reduction in the spin–orbit

splitting.

https://doi.org/10.1016/j.physletb.2018.01.015

0370-2693/

SCOAP

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