TWO PROTON RADIOACTIVITY OF 18Ne

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1141-1147
Author(s):  
F. GIACOPPO ◽  
G. RACITI ◽  
E. RAPISARDA ◽  
G. CARDELLA ◽  
C. SFIENTI ◽  
...  
Keyword(s):  
Excited States ◽  
Incident Energy ◽  
Coulomb Excitation ◽  
Branching Ratio ◽  
Proton Decay ◽  
Interaction Process ◽  
Secondary Beam ◽  
Energy Correlation ◽  
Secondary Target ◽  
Proton Radioactivity

The decay of 18 Ne excited states into 2 p +16 O channel has been studied. The 18 Ne secondary beam, at 33 AMeV incident energy, was produced by fragmentation of a primary 20 Ne beam at the LNS-FRIBs facility. Coulomb excitation on a nat Pb secondary target was found to be the main interaction process leading to the population of 18 Ne excited levels. The two-proton decay of the 6.15 MeV (1-) level has been detected, but in addition other high-lying states decaying via 2 p emission were observed. A significant branching ratio of 2 He decay has been deduced from the analysis of the relative angle and energy correlation spectra of the two protons emitted from the 6.15 MeV (1-) state.

2He DECAY FROM EXCITED STATES: THE 18Ne CASE

2011 ◽  
Vol 20 (04) ◽  
pp. 976-979 ◽  
Author(s):  
G. RACITI ◽  
M. DE NAPOLI ◽  
E. RAPISARDA ◽  
G. CARDELLA ◽  
F. GIACOPPO ◽  
...  
Keyword(s):  
Excited States ◽  
Proton Decay ◽  
Beam Line ◽  
Relative Momentum ◽  
Radioactive Beams ◽  
Sequential Decay ◽  
Fragment Separator ◽  
Proton Radioactivity

Two-proton radioactivity studies have been performed on excited states of 18 Ne produced by 20 Ne fragmentation at the FRIBs facility of the Laboratori Nazionali del Sud. The study of the relative-momentum correlations of the two protons allowed to disentangle the diproton, democratic and sequential decay contributions to the 2p emission. In order to extend the study on two-proton decay to other light-masses nuclei, an upgrade of the FRIBs facility is planned. A new configuration of the Fragment Separator would be able to increase the acceptance of the beam line and therefore the yield of the produced radioactive beams. Also the present tagging setup will be modified in view of the gain intensity, in order to sustain the higher foreseen incoming rate. Status and perspectives of the facility will be presented.

scholarly journals GDR Contribution to Coulomb Excitation. II. 17O

1982 ◽  
Vol 35 (3) ◽  
pp. 301 ◽  
Author(s):  
FC Barker
Keyword(s):  
Excited State ◽  
Shell Model ◽  
Excited States ◽  
Giant Dipole Resonance ◽  
Coulomb Excitation ◽  
Dipole Resonance ◽  
First Excited State ◽  
Virtual Excitation

The contribution to the Coulomb excitation of the first excited state of 170 due to virtual excitation of the giant dipole resonance (GDR) is calculated, using shell model wavefunctions for the ground and first excited states. A large value is obtained.

Proton decay branching ratio for the 6.15-MeV18Ne level

2012 ◽  
Vol 85 (6) ◽  
Author(s):  
D. W. Bardayan ◽  
J. C. Blackmon ◽  
R. L. Kozub ◽  
M. Matoš ◽  
M. S. Smith
Keyword(s):  
Branching Ratio ◽  
Proton Decay

Coulomb Excitation of Low-Lying Excited States inSc45

1967 ◽  
Vol 159 (4) ◽  
pp. 926-930 ◽  
Author(s):  
A. E. Blaugrund ◽  
R. E. Holland ◽  
F. J. Lynch
Keyword(s):  
Excited States ◽  
Coulomb Excitation

scholarly journals Effect of Excited-state Decays on the Measured Angular Distribution of the 12C(g, p)11B Reaction

1974 ◽  
Vol 27 (3) ◽  
pp. 301 ◽  
Author(s):  
Judith M Dixon ◽  
MN Thompson
Keyword(s):  
Angular Distribution ◽  
Excited State ◽  
Excited States ◽  
Cross Section ◽  
Proton Decay ◽  
Small Cross Section

The angular distribution of photoprotons from i2e as measured directly and as deduced from the inverse reaction are compared. A discrepancy is revealed; it is resolved by proposing a small cross section for proton decay to excited states of 11 B. The size

scholarly journals Determination of GT-transition Strengths in \(A=34\) Isobars Using Charge Exchange \((^3\text{He},t)\) Reaction

2012 ◽  
Vol 22 (1) ◽  
pp. 91-96
Author(s):  
Nguyen Tuan Khai ◽  
Bui Duy Linh ◽  
Tran Duc Thiep ◽  
Y. Fujita ◽  
T Adachi ◽  
...  
Keyword(s):  
Excitation Energy ◽  
Excited States ◽  
Ground State ◽  
Incident Energy ◽  
High Energy ◽  
High Energy Resolution ◽  
Good Quantum Number ◽  
Gamow Teller ◽  
Good Agreement

Under the assumption that isospin \(T\) is a good quantum number, mirror transitions \(T_{z }= +1 \to  0\) and \(T_{z }= -1  \to  0\) were studied in \(A = 34\) isobars, where \(T_{z}\) is \(z\) component of iospin \(T\) and is defined by \(T_{z} = (N-Z)/2\). With a high energy resolution of 35 keV in \(^{34}\)S\((^{3}He,t)^{34}\)Cl reaction measurement at \(0^{\circ}\) scattering angle and at an incident energy of 140 MeV/nucleon, strengths of Fermi and Gamow-Teller (GT) transitions from the \(J^{\pi } = 0^{ + }\), \(T_{z }= +1\) ground state of \(^{34}\)S to the \(J^{\pi } = 1^{+ }\), \(T_{z }= 0\) excited states in \(^{34}\)Cl were determined up to excitation energy \((E_{x})\) of \(7.08\) MeV. The corresponding isospin-symmetric transitions connecting \(T_{z }= -1\) and \(T_{z }= 0\) states can be studied in the \(^{34}\)Ar \(\beta ^{ + }\) decay. The strengths of the \((GT)_{\pm }\) transitions were compared up to the excitation energy of 3.1 MeV. A good agreement was observed for two strong transitions to \(2.580\) MeV and \(3.129\) MeV states, while a disagreement about \(45\text{%}\) was observed for a weaker transition to \(0.666\) MeV low-lying state.

scholarly journals Search for Isovector Valence-Shell Excitations in 140Nd and 142Sm via Coulomb excitation reactions of radioactive ion beams

2018 ◽  
Vol 194 ◽  
pp. 03003 ◽  
Author(s):  
Ralph Kern ◽  
Robert Stegmann ◽  
Norbert Pietralla ◽  
Georgi Rainovski ◽  
Liam Paul Gaffney ◽  
...  
Keyword(s):  
Excited States ◽  
Coulomb Excitation ◽  
Ion Beams ◽  
Radioactive Ion Beams ◽  
Silicon Strip Detector ◽  
Electromagnetic Transition ◽  
Mixed Symmetry ◽  
Transition Matrix Elements ◽  
Γ Rays

Projectile Coulomb excitation experiments were performed at HIE-ISOLDE at CERN with the radioactive ion beams of 140Nd and 142Sm. Ions with an energy of 4:62 MeV/A were impinging on a 1.45 mg/cm2 thick 208Pb target. The γ-rays depopulating the Coulomb-excited states were recorded by the HPGe-array MINIBALL and scattered particles were detected by a double-sided silicon strip detector. Experimental intensities were used for the determination of electromagnetic transition matrix elements. A preliminary result of the B(M1; 2+3 → 2+1) of 140Nd and an upper limit for the case of 142Sm are revealing the main fragments of the proton-neutron mixed-symmetry 2+1;ms states.

scholarly journals Investigation of E1 Strength in Coulomb Excitation of Light Nuclei

1989 ◽  
Vol 42 (3) ◽  
pp. 233 ◽  
Author(s):  
FC Barke ◽  
CL Woods
Keyword(s):  
Harmonic Oscillator ◽  
Shell Model ◽  
Excited States ◽  
Single Particle ◽  
Coulomb Excitation ◽  
Light Nuclei ◽  
Additional Increase ◽  
Intermediate States ◽  
Experimental Values

Contributions to the predominantly E2 Coulomb excitation of the first excited states of 6U, 7U, lOB, 11 B, 12C and 170 due to virtual E1 transitions through intermediate states are calculated using for all states shell model wavefunctions of the lowest admissible configurations, obtained with a realistic Hamiltonian. When harmonic oscillator single-particle wavefunctions are used, the contributions can be calculated rigorously but are generally less than the experimental values. Increases due to use of Woods-Saxon wavefunctions are estimated in a semi-quantitative way. For 170, the additional increase due to admixtures from higher configurations in the wavefunctions is also considered.

scholarly journals New Results on Excited States in the one-particle one-hole nucleus 56Co measured with MINIBALL detectors

2019 ◽  
Vol 223 ◽  
pp. 01042
Author(s):  
A. Montaner-Pizá ◽  
B. Rubio ◽  
D. Mücher ◽  
S.E.A. Orrigo ◽  
E.C. Simpson ◽  
...  
Keyword(s):  
High Resolution ◽  
Excited States ◽  
Level Scheme ◽  
Incident Energy ◽  
Angular Distributions ◽  
Spin Parity ◽  
Evaporation Reaction ◽  
The One ◽  
Large Improvement ◽  
Fusion Evaporation Reaction

The non-yrast states of the odd-odd nucleus 56Co have been investigated by studying the γ-rays induced in the predominantly fusion-evaporation reaction 56Fe(p,n γ)56Co at an incident energy of 10 MeV. The γ-rays were measured in-beam with four high-resolution MINIBALL-triple germanium (Ge) detectors. The experiment provided excellent data in γ-γ coincidences. The complex level scheme of 56Co was constructed mainly based on the analysis of these γ-γ coincidences. The angular distributions of the γ-rays were also analysed and allowed us to assign spin-parity values to most of the excited states in this nucleus. Despite the extensive work previously done studying the 56Co nucleus, the analysis presented in this work has resulted in a large improvement in the knowledge of its structure.

Two-proton radioactivity of ground and excited states within a unified fission model

2021 ◽  
Author(s):  
Fengzhu Xing ◽  
Jianpo Cui ◽  
Yanzhao Wang ◽  
Jian-Zhong 顾建中 Gu
Keyword(s):  
Excited States ◽  
Proton Radioactivity
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