Binding energies of near proton-drip line Z = 22-28 isotopes determined

September 29, 2018

The nuclei at the proton-drip lines are important to test nuclear models in extreme conditions. The near proton-drip line isotopes have been produced by bombarding 345A MeV 78Kr on the 9Be target by Blank et al. at RIKEN-BigRIPS. A recent study predicted the binding energy of these isotopes.

The article entitled: "Binding energies of near proton-drip line Z = 22-28 isotopes determined from measured isotopic cross section distributions", recently published on issue 1 of Science Chinese Physics, Mechanics & Astronomy in 2019 (English version). The article was written by Professor Ma Chun-Wang of Henan Normal University as a communication author. The researchers predicted the binding energy of the very proton-rich nuclei by the exponential dependence between the isotopic cross-section distribution and the binding energy.

Many new phenomena, which are very different to the properties of the β-stable nucleus, have been found in the nuclei around the proton-drip line, including the exotic proton-halo or proton-skin structure, the β-delayed one, two, or multi protons emission, shell evolution. Besides, the nuclei that lie on the proton-drip line are very important in nuclear astrophysics because of their importance in the study of the energy and mass production and the astrophysical nucleon synthesis process including the rp-process. While the property of the isotope near the proton-drip line is hard to be known in the experiment because of its very low production probability. The improved radioactive ion beam techniques (such as the ion storage ring) provide us the new opportunity to learn more about the nuclei near the proton-drip line.

The relationship between the cross section and binding energy of neutron-rich fragments has been found by Tsang et al., which depends exponentially on the average binding energy per nucleon . In the article, standard cross section method was used to predict the cross section of I= -3 to 1 fragment in the 345A MeV 78Kr + 9Be reaction. These cross sections and experimental binding energy were used to verify the exponential dependence between cross section and binding energy for proton-rich isotope. The exponential dependence was also used to predict the isotope binding energy of I=-5 and -4 nuclei. According to the scaling phenomenon of the difference between the mass of mirror nuclei, the predicted binding energy of proton-rich isotope was verified. It is found that the predicted binding energy has agree well to the scaling phenomenon of mirror nuclei, which verifies the method proposed is reliable.

The binding energy of the near proton-drip line isotopes of Z=22-28, which have been measured in the 345A MeV 78Kr + 9Be reaction, are the first time determined from the measured isotopic cross section distributions. The binding energies are determined from the correlation between cross section and the average binding energy per nucleon, which are further justified from the scaling phenomenon of mass difference between mirror nuclei. The method proposed overcomes the lack of cross sections for isotopes, making it possible to determine the binding energy of very proton-rich isotopes in planning future experiment.
-end-
This research was funded by the National Natural Science Foundation of China(Grand No. 11421505, and U1732135), Major State Basic Research Development Program in China(Grant No.2014CB845 401), Natural Science Foundation of Henan Province (Grant No. 162300410179), Henan Normal University for the Excellent Youth (Grant No. 154100510007).

See the article:

Chun-Wang Ma, Yi-Dan Song, and Hui-Ling We. Predicting the binding energy of near proton-drip line Z = 22-28 isotopes determined from measured isotopic cross section distributions by Chinese Science Physics, Mechanics & Astronomy, 2019, Vol.62, No. 1: 012013

http://link.springer.com/article/10.1007/s11433-018-9256-8

Science China Press

Related Energy Articles from Brightsurf:

Energy System 2050: solutions for the energy transition
To contribute to global climate protection, Germany has to rapidly and comprehensively minimize the use of fossil energy sources and to transform the energy system accordingly.

Cellular energy audit reveals energy producers and consumers
Researchers at Gladstone Institutes have performed a massive and detailed cellular energy audit; they analyzed every gene in the human genome to identify those that drive energy production or energy consumption.

First measurement of electron energy distributions, could enable sustainable energy technologies
To answer a question crucial to technologies such as energy conversion, a team of researchers at the University of Michigan, Purdue University and the University of Liverpool in the UK have figured out a way to measure how many 'hot charge carriers' -- for example, electrons with extra energy -- are present in a metal nanostructure.

Mandatory building energy audits alone do not overcome barriers to energy efficiency
A pioneering law may be insufficient to incentivize significant energy use reductions in residential and office buildings, a new study finds.

Scientists: Estonia has the most energy efficient new nearly zero energy buildings
A recent study carried out by an international group of building scientists showed that Estonia is among the countries with the most energy efficient buildings in Europe.

Mapping the energy transport mechanism of chalcogenide perovskite for solar energy use
Researchers from Lehigh University have, for the first time, revealed first-hand knowledge about the fundamental energy carrier properties of chalcogenide perovskite CaZrSe3, important for potential solar energy use.

Harvesting energy from walking human body Lightweight smart materials-based energy harvester develop
A research team led by Professor Wei-Hsin Liao from the Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong (CUHK) has developed a lightweight smart materials-based energy harvester for scavenging energy from human motion, generating inexhaustible and sustainable power supply just from walking.

How much energy do we really need?
Two fundamental goals of humanity are to eradicate poverty and reduce climate change, and it is critical that the world knows whether achieving these goals will involve trade-offs.

New discipline proposed: Macro-energy systems -- the science of the energy transition
In a perspective published in Joule on Aug. 14, a group of researchers led by Stanford University propose a new academic discipline, 'macro-energy systems,' as the science of the energy transition.

How much energy storage costs must fall to reach renewable energy's full potential
The cost of energy storage will be critical in determining how much renewable energy can contribute to the decarbonization of electricity.

Read More: Energy News and Energy Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.