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Showing 2020 · nucl-exShow all

21 papers · 2 filters

nucl-ex2020★ 8 cited

Photoproduction of the meson using the CLAS detector

M. ~Carver, A. ~Celentano, K. ~Hicks +137

The quark structure of the meson has, for many years, been assumed to be a pure quark-antiquark () resonance with quantum numbers . Recently,…

nucl-ex2020★ 15 cited

Experimental study of the F+ C fusion reaction and its implications for fusion of proton-halo systems

B. W. Asher, S. Almaraz-Calderon, Vandana Tripathi +8

The halo nature of the low-lying + first excited state of the exotic weakly-bound proton drip-line nucleus F has long been hypothesized. The structure of such a halo nu…

nucl-ex2020★ 20 cited

Observation of the Cusp in the New Precise Beam Asymmetry Data for

TAPS Collaboration

Data on the beam asymmetry in the photoproduction of mesons off protons are reported for tagged photon energies from 1130 to 1790 MeV (mass range from 1748 MeV to …

nucl-ex2020★ 31 cited

Accessing the Single-Particle Structure of the Pygmy Dipole Resonance in Pb

M. Spieker, A. Heusler, B. A. Brown +8

New experimental data on the neutron single-particle character of the Pygmy Dipole Resonance (PDR) in Pb are presented. They were obtained from and resonant proton…

nucl-ex2020★ 13 cited

Shell structure of S and collapse of the shell closure

S. Momiyama, K. Wimmer, D. Bazin +13

The single-particle structure of the isotones provides insights into the shell evolution of neutron-rich nuclei from the doubly-magic Ca toward the drip line. …

nucl-ex2020★ 9 cited

Measurement of beam asymmetry for photoproduction on the proton at =8.5 GeV

GlueX Collaboration, S. Adhikari, C. S. Akondi +134

We report a measurement of the photoproduction beam asymmetry for the reaction using data from the GlueX experiment in the photon beam energy…

nucl-ex2020★ 22 cited

Extraction of beam-spin asymmetries from the hard exclusive channel off protons in a wide range of kinematics

S. Diehl, K. Joo, A. Kim +135

We have measured beam-spin asymmetries to extract the moment from the hard exclusive reaction above the resonance region, fo…

nucl-ex2020★ 6 cited

Multi-step processes in heavy-ion induced single-nucleon transfer reactions

N. Keeley, K. W. Kemper, K. Rusek

It was first noted during the 1970s that finite-range distorted wave Born approximation (FR-DWBA) calculations were unable satisfactorily to describe the shape of the angular distr…

nucl-ex2020★ 45 cited

An experimental program with high duty-cycle polarized and unpolarized positron beams at Jefferson Lab

A. Accardi, A. Afanasev, I. Albayrak +227

Positron beams, both polarized and unpolarized, are identified as essential ingredients for the experimental programs at the next generation of lepton accelerators. In the context…

nucl-ex2020★ 6 cited

Photoproduction of mesons off the proton for GeV using CLAS at Jefferson Laboratory

T. Hu, Z. Akbar, V. Crede +148

Photoproduction cross sections are reported for the reaction using energy-tagged photons and the CLAS spectrometer at Jefferson Laboratory. The mesons are detected i…

nucl-ex2020★ 3 cited

Observation of T=3/2 Isobaric Analog States in 9Be using p+8Li resonance scattering

C. Hunt, G. V. Rogachev, S. Almaraz-Calderon +10

Background: Resonance scattering has been extensively used to study the structure of exotic, neutron-deficient nuclei. Extension of the resonance scattering technique to neutron-ri…

nucl-ex2020★ 26 cited

Observation of -vibrations and alignments built on non-ground-state configurations in 156Dy

S. N. T. Majola, D. J. Hartley, L. L. Riedinger +25

The exact nature of the lowest rotational bands in all deformed nuclei remains obscure. Traditionally they are assumed to be collective vibrations of the nuclear shape…

nucl-ex2020★ 5 cited

First candidates for γ vibrational bands built on the [505]11/2- neutron orbital in odd-A Dy isotopes

S. N. T. Majola, M. A. Sithole, L. Mdletshe +67

Rotational structures have been measured using the Jurogam II and GAMMASPHERE arrays at low spin following the 155Gd(α,2n)157Dy and 148Nd(12C, 5n)155Dy reactions at 25 and 65 MeV,…

nucl-ex2020★ 4 cited

Spectroscopy of low spin states in 157Dy: Search for evidence of enhanced octupole correlations

S. N. T. Majola, R. A. Bark, L. Bianco +40

Low-spin states of 157Dy have been studied using the JUROGAM II array, following the 155Gd (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157Dy has been expanded…

nucl-ex2020★ 26 cited

Compressional-mode resonances in the molybdenum isotopes: Emergence of softness in open-shell nuclei near A=90

K. B. Howard, U. Garg, M. Itoh +20

"Why are the tin isotopes soft?" has remained, for the past decade, an open problem in nuclear structure physics: models which reproduce the isoscalar giant monopole resonance (ISG…

nucl-ex2020★ 154 cited

Modified Structure of Protons and Neutrons in Correlated Pairs

B. Schmookler, M. Duer, A. Schmidt +6

The atomic nucleus is made of protons and neutrons (nucleons), that are themselves composed of quarks and gluons. Understanding how the quark-gluon structure of a nucleon bound in…

nucl-ex2020★ 102 cited

Probing the core of the strong nuclear interaction

A. Schmidt, J. R. Pybus, R. Weiss +162

The strong nuclear interaction between nucleons (protons and neutrons) is the effective force that holds the atomic nucleus together. This force stems from fundamental interactions…

nucl-ex2020★ 11 cited

First measurement of direct photoproduction of the meson on the proton

A. Celentano, M. Battaglieri, R. De Vita +4

We present the first measurement of the exclusive reaction in the photon energy range - GeV and four-momentum transfer squared $0.2<-t<2…

nucl-ex2020★ 6 cited

Search for the high-spin members of the :2n: band in Be

Sriteja Upadhyayula, Grigory V. Rogachev, Jack Bishop +9

Method: Measuring excitation functions for He+ scattering, populating states in the excitation energy range from 4.5 MeV to 8 MeV in Be using a He rare-isotope…

nucl-ex2020★ 7 cited

Measurement of the Photon Beam Asymmetry in at GeV

The GlueX Collaboration, S. Adhikari, A. Ali +124

We report measurements of the photon beam asymmetry for the reaction (1193) using the GlueX spectrometer in Hall D at Jefferson Lab. Data were collected usin…

nucl-ex2020★ 46 cited

Evolution of the N=20 and 28 Shell Gaps and 2-particle-2-hole states in the FSU Interaction

R. S. Lubna, K. Kravvaris, S. L. Tabor. Vandana Tripathi +2

The FSU cross-shell interaction for the shell model was successfully fitted to a wide range of mostly intruder negative parity states of the shell nuclei. This paper…