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# Covariant spectator theory of $np$ scattering: Deuteron form factors

## Abstract

The deuteron form factors are calculated using two model wave functions obtained from the 2007 CST high precision fits to $np$ scattering data. Included in the calculation are a new class of isoscalar $np$ interaction currents which are automatically generated by the nuclear force model used in these fits. If the nuclear model WJC2 is used, a precision fit ($$\chi^2$$/datum $$\eqsim1$$) to the Sick Global Analysis (GA) of all $ed$ elastic scattering data can be obtained by adjusting the unknown off-shell nucleon form factors $$F_3(Q^2)$$ (discussed before) and $$F_4(Q^2)$$ (introduced in this paper), and predicting the high $Q^2$ behavior of the neutron charge form factor $$G_{En}(Q^2)$$ well beyond the region where it has been measured directly. Relativistic corrections, isoscalar interaction currents, and off-shell effects are defined, discussed, and their size displayed. A rationale for extending $ed$ elastic scattering measurements to higher $Q^2$ is presented.

- Authors:

- Publication Date:

- Research Org.:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

- OSTI Identifier:
- 1598487

- Alternate Identifier(s):
- OSTI ID: 1596896

- Report Number(s):
- JLAB-THY-19-3022; DOE/OR/23177-4769; arXiv:1908.09421

Journal ID: ISSN 2469-9985; PRVCAN

- Grant/Contract Number:
- AC05-06OR23177

- Resource Type:
- Accepted Manuscript

- Journal Name:
- Physical Review C

- Additional Journal Information:
- Journal Volume: 101; Journal Issue: 2; Journal ID: ISSN 2469-9985

- Country of Publication:
- United States

- Language:
- English

### Citation Formats

```
Gross, Franz. Covariant spectator theory of np scattering: Deuteron form factors. United States: N. p., 2020.
Web. doi:10.1103/PhysRevC.101.024001.
```

```
Gross, Franz. Covariant spectator theory of np scattering: Deuteron form factors. United States. doi:10.1103/PhysRevC.101.024001.
```

```
Gross, Franz. Sat .
"Covariant spectator theory of np scattering: Deuteron form factors". United States. doi:10.1103/PhysRevC.101.024001.
```

```
@article{osti_1598487,
```

title = {Covariant spectator theory of np scattering: Deuteron form factors},

author = {Gross, Franz},

abstractNote = {The deuteron form factors are calculated using two model wave functions obtained from the 2007 CST high precision fits to $np$ scattering data. Included in the calculation are a new class of isoscalar $np$ interaction currents which are automatically generated by the nuclear force model used in these fits. If the nuclear model WJC2 is used, a precision fit ($\chi^2$/datum $\eqsim1$) to the Sick Global Analysis (GA) of all $ed$ elastic scattering data can be obtained by adjusting the unknown off-shell nucleon form factors $F_3(Q^2)$ (discussed before) and $F_4(Q^2)$ (introduced in this paper), and predicting the high $Q^2$ behavior of the neutron charge form factor $G_{En}(Q^2)$ well beyond the region where it has been measured directly. Relativistic corrections, isoscalar interaction currents, and off-shell effects are defined, discussed, and their size displayed. A rationale for extending $ed$ elastic scattering measurements to higher $Q^2$ is presented.},

doi = {10.1103/PhysRevC.101.024001},

journal = {Physical Review C},

number = 2,

volume = 101,

place = {United States},

year = {2020},

month = {2}

}

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