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The international group coordinated by Francesco Recchia from the Department of Physics and Astronomy at the University of Padua and the National Institute for Nuclear Physics, Padua section, has identified the boundaries of a new Island of Inversion through experiments conducted at Michigan State University. The study, published in "Nature Communications" under the title "Abrupt structural transition in exotic molybdenum isotopes unveils an isospin-symmetric island of inversion," reveals for the first time an "Isospin-Symmetric Island of Inversion" characterised by simultaneous excitations of neutrons and protons, opening new perspectives on the structure of nuclear matter.
The phenomenon arises when neutrons in neutron-rich nuclei "jump across the energy gap," as explained by Francesco Recchia, causing the traditional "magic numbers" to "disappear" and reorganising the nucleus into more bound configurations, which give rise to the so-called "Islands of Inversion."
The experiment was conducted at the NSCL laboratory of Michigan State University, where the isotope 86Mo was produced by fragmenting 92Mo nuclei and selected through a magnetic separator. To analyse its structure, the beam was made to interact with a second target, inducing excited states that decay by emitting gamma radiation.
The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The phenomenon arises when neutrons in neutron-rich nuclei "jump across the energy gap," as explained by Francesco Recchia, causing the traditional "magic numbers" to "disappear" and reorganising the nucleus into more bound configurations, which give rise to the so-called "Islands of Inversion."
The experiment was conducted at the NSCL laboratory of Michigan State University, where the isotope 86Mo was produced by fragmenting 92Mo nuclei and selected through a magnetic separator. To analyse its structure, the beam was made to interact with a second target, inducing excited states that decay by emitting gamma radiation.
The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The phenomenon arises when neutrons in neutron-rich nuclei "jump across the energy gap," as explained by Francesco Recchia, causing the traditional "magic numbers" to "disappear" and reorganising the nucleus into more bound configurations, which give rise to the so-called "Islands of Inversion."
The experiment was conducted at the NSCL laboratory of Michigan State University, where the isotope 86Mo was produced by fragmenting 92Mo nuclei and selected through a magnetic separator. To analyse its structure, the beam was made to interact with a second target, inducing excited states that decay by emitting gamma radiation.
The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
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The international group coordinated by Francesco Recchia from the Department of Physics and Astronomy at the University of Padua and the National Institute for Nuclear Physics, Padua section, has identified the boundaries of a new Island of Inversion through experiments conducted at Michigan State University. The study, published in "Nature Communications" under the title "Abrupt structural transition in exotic molybdenum isotopes unveils an isospin-symmetric island of inversion," reveals for the first time an "Isospin-Symmetric Island of Inversion" characterised by simultaneous excitations of neutrons and protons, opening new perspectives on the structure of nuclear matter.
The phenomenon arises when neutrons in neutron-rich nuclei "jump across the energy gap," as explained by Francesco Recchia, causing the traditional "magic numbers" to "disappear" and reorganising the nucleus into more bound configurations, which give rise to the so-called "Islands of Inversion."
The experiment was conducted at the NSCL laboratory of Michigan State University, where the isotope 86Mo was produced by fragmenting 92Mo nuclei and selected through a magnetic separator. To analyse its structure, the beam was made to interact with a second target, inducing excited states that decay by emitting gamma radiation.
The detection of gamma rays was made possible by the GRETINA system, "a sphere of hyper-pure germanium crystals" capable of reconstructing the energy and direction of photons, as emphasised by Jeongsu Ha, the first author of the article, "correcting the Doppler effect" due to the high speed of the nuclei. Measurements on the isotopes 84Mo and 86Mo show an abrupt structural transition, indicating the emergence of the new island of inversion, where proton and neutron excitations dominate over the traditional shell structure. "We have obtained a coherent view of the evolution of nuclear structure, unifying the behaviour of neutron-rich nuclei and proton-rich nuclei," concludes Recchia.
This discovery redefines the understanding of the "map" of nuclear matter and provides valuable insights into three-body nuclear forces, which are still largely unexplored.
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The international group coordinated by Francesco Recchia from the Department of Physics and Astronomy at the University of Padua and the National Institute for Nuclear Physics, Padua section, has identified the boundaries of a new Island of Inversion through experiments conducted at Michigan State University. The study, published in "Nature Communications" under the title "Abrupt structural transition in exotic molybdenum isotopes unveils an isospin-symmetric island of inversion," reveals for the first time an "Isospin-Symmetric Island of Inversion" characterised by simultaneous excitations of neutrons and protons, opening new perspectives on the structure of nuclear matter.
The phenomenon arises when neutrons in neutron-rich nuclei "jump across the energy gap," as explained by Francesco Recchia, causing the traditional "magic numbers" to "disappear" and reorganising the nucleus into more bound configurations, which give rise to the so-called "Islands of Inversion."
The experiment was conducted at the NSCL laboratory of Michigan State University, where the isotope 86Mo was produced by fragmenting 92Mo nuclei and selected through a magnetic separator. To analyse its structure, the beam was made to interact with a second target, inducing excited states that decay by emitting gamma radiation.
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This discovery redefines the understanding of the "map" of nuclear matter and provides valuable insights into three-body nuclear forces, which are still largely unexplored.
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