# Electric-dipole transitions in 6Li with a fully microscopic six-body calculation

### Submission summary

 As Contributors: Wataru Horiuchi Preprint link: scipost_201912_00021v1 Date submitted: 2019-12-05 01:00 Submitted by: Horiuchi, Wataru Submitted to: SciPost Physics Proceedings Proceedings issue: 24th European Few Body Conference (University of Surrey, U.K.) Academic field: Physics Specialties: Nuclear Physics - Theory Approach: Theoretical

### Abstract

Exploring new excitation modes and the role of the nuclear clustering has been of great interest. An interesting speculation was made in the recent photoabsorption measurement of 6Li that implied the importance of the nuclear clustering. To understand the excitation mechanism of 6Li, we perform a fully microscopic six-body calculation on the electric-dipole (E1) transitions and discuss how 6Li is excited by the E1 field as a function of the excitation energy. We show the various cluster components in the six-body wave functions and discuss the role of the nuclear clustering in the E1 excitations of 6Li.

###### Current status:
Has been resubmitted

### Submission & Refereeing History

Resubmission scipost_201912_00021v4 on 12 December 2019

Submission scipost_201912_00021v1 on 5 December 2019

## Reports on this Submission

### Anonymous Report 1 on 2019-12-11 Invited Report

• Cite as: Anonymous, Report on arXiv:scipost_201912_00021v1, delivered 2019-12-11, doi: 10.21468/SciPost.Report.1384

### Report

The paper presents 6-body microscopic calculations of electric dipole transitions in 6Li. It is written in a clear way and gives an insight into the structure of excited 6Li states and its influence on various transition modes. I recommend to publish it after a few clarifications.

### Requested changes

1) As I understand the basis used involves wave functions that asymptotically decrease. Therefore, the continuum nature of the excited states is not taken into account. This is why excited states have well-defined energies and B(E1) probabilities are given by lines. This feature of the theory is not mentioned in the text and it would be helpful to make it clear to the reader. Also, it would be nice to comment on the possibility of including the continuum explicitly.
2) What is the definition of the spectroscopic factors used? Is it the same as the widely-accepted one? The definition of the spectroscopic factor should be given. It would also be useful to tell the reader what the spectroscopic factors for the 6Li ground state are. The spectroscopic factors are denoted as S rather than S^2 by those who investigate them experimentally.
3) It would be useful to add experimental 6Li energy in Fig. 1.
4) In first paragraph of Conclusion “asympototic “ - - > “asymptotic”.

• validity: good
• significance: good
• originality: good
• clarity: good
• formatting: good
• grammar: reasonable

Author Wataru Horiuchi on 2019-12-12
(in reply to Report 1 on 2019-12-11)

Dear Referee,

Thank you for your comments. We have revised the text following the most of your suggestions.

1) We have added a paragraph to the end of Sec. 2.2.2, to explain the feature of the theory and the possibility of taking care of the continuum effect.

2) We have written the definition of the spectroscopic factors used in this paper. The values of the spectroscopic factors of the ground state of 6Li have also been added.

3) With $u=1.0$ the ground-state energy of 6Li is not reproduced. To avoid the confusion, we mentioned the ground state energy of 6Li in Sec. 2.1.

4) We have corrected the typo.

Thank you again for taking your time to review our manuscript.

Sincerely, Wataru Horiuchi