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Evidence for the First Excited State of ^{7}H.

A A Bezbakh^1,2, V Chudoba^1,2, S A Krupko^1,3

¹Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia.

Physical Review Letters

|February 1, 2020

Summary

This summary is machine-generated.

Researchers studied the Hydrogen-7 (⁷H) system using a Helium-8 (⁸He) beam. They observed indications of the 1/2⁺ ground state and excited states of ⁷H, providing new insights into exotic nuclei.

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Area of Science:

Nuclear Physics
Exotic Nuclei Research
Hadron Spectroscopy

Background:

The study of exotic nuclei, such as Hydrogen-7 (⁷H), is crucial for understanding nuclear structure and the limits of nuclear existence.
Previous experimental data on ⁷H has been limited, necessitating further investigation into its properties and decay modes.

Purpose of the Study:

To populate and investigate the ^{7}H nuclear system.
To reconstruct the missing mass energy spectrum and decay characteristics of ^{7}H.
To identify and characterize the ground state and excited states of ^{7}H.

Main Methods:

Utilized the ^{2}H(^{8}He,^{3}He)^{7}H reaction with a 26 MeV/nucleon ^{8}He beam.
Reconstructed the ^{7}H missing mass energy spectrum.
Analyzed the ^{3}H energy and angular distributions in the ^{7}H decay frame.

Main Results:

Observed a peak in the ^{7}H missing mass spectrum, potentially indicating unresolved 5/2⁺ and 3/2⁺ states at 6.5(5) MeV.
Provided evidence for the 1/2⁺ ground state of ^{7}H at 1.8(5) MeV.
Measured a low population cross-section for the ground state (∼25 μb/sr) within a specific angular range.

Conclusions:

The experimental data suggest the existence of both ground state (1/2⁺) and excited states (5/2⁺, 3/2⁺) in the ^{7}H system.
The observed properties of ^{7}H contribute to the understanding of nuclear stability and the forces governing light, exotic nuclei.
Further experiments are warranted to confirm these findings and refine the understanding of ^{7}H's nuclear structure.